| :: hepatocytes testosterone metabolism |
Does BD Biosciences use hepatocytes for in vitro metabolism and/or induction 4'-hydroxylase (CYP2C9), bufuralol 1'-hydroxylase (CYP2D6), testosterone
Ketoconazole inhibited metabolism of testosterone with 40% .. and epithelial cells), metabolic activity was recalculated per mg hepatocyte or epithelial protein.
The determination of metabolite profile in liver microsomes or hepatocytes is designed to provide information regarding the metabolic fate of a test compound in
Cryopreservation of viable hepatocyte monolayers in cryoprotectant media with high metabolism of testosterone and kaempherol post-cryopreservation (2004)
testosterone (20 µM) and 7-Hydroxy 4-trifluoromethylcoumarin (HFC, 25 µM) as . metabolic clearance from in vitro intrinsic clearance data in hepatocytes and
Analysis of basal CYP activities and testosterone metabolism revealed that Δ202 cells showed higher similarities to mouse hepatocytes than Hepa 1c1c7
Hepatocytes are liver epithelial cells used for both basic research and drug These include the major phase I drug metabolism enzyme family (P450) and phase II 200 μM Testosterone as a substrate to measure CYP3A4 (left graph) activity
important function of drug metabolism in hepatocytes. . show variations in testosterone metabolism (e.g. the Gunn rat strain CYP2C11 has a
Cryopreserved human hepatocytes are suitable for induction, inhi- bition These hepatocytes are ideal for metabolism studies. Testosterone 6β-hydroxylation
The use of primary hepatocyte cultures as in vitro models for studying xenobiotic .. The metabolism of testosterone by the hepatocytes maintained in different
As the metabolic alterations coinciding with the availability of effective ART .. hepatocyte proliferation, intracellular lipids, and cyclooxygenase-2 levels. Effects of physiologic testosterone supplementation on fat mass and
Effects of green tea compounds on irinotecan metabolism However, the production of 6beta-hydroxytestosterone remained unaffected in other hepatocyte
The oxidative metabolism of testosterone was analysed as an additional parameter to estimate the drug-metabolising capacity of cells. Human hepatocytes
Primary hepatocytes of the rainbow trout (Oncorhynchus mykiss), flounder ( Platychthis ¯esus), dab influence testosterone metabolism directly by induction
SpringerImages - Multiple CYP isoform assay. Testosterone metabolism was studied in cultures of human hepatocytes as described in the section “”. C control, A
progesterone and testosterone) o Other receptors and molecular targets. (n:1.24) o Metabolism in human and rat hepatocytes o Inhibition of P450 enzymes
Cryopreserved human hepatocytes - Chemico-Biological Assessment of metabolic capacity using testosterone metabolism, Drug Metab.
Cryopreserved hepatocytes represent the current “state of the art” model system for studying xenobiotic metabolism and drug-drug interaction potential.
those in the wild-type liver and in primary mouse hepatocytes. 3. Analysis of basal CYP activities and testosterone metabolism revealed that ∆202 cells showed
Ethoxycoumarin and ethoxyresorufin O-deethylase activities were equivalent in fresh and CP hepatocytes. 4. The profile of testosterone metabolism was
Overall, the metabolic activity of CYP3A5 was less than that of CYP3A4. Ketoconazole Oxidized nifedipine formation was inhibited by testosterone in rCYP3A4. However, in In Vitro Models: Hepatocytes & Microsomes
Collagen coating improves the maintenance of hepatocytes on polymeric Testosterone metabolism was more extensive in cells cultured on collagen films than
The cultures may be used to produce hepatocyte products, evaluate metabolism of an agent, propagate Hepatitis C virus and test agents as
3. Analysis of basal CYP activities and testosterone metabolism revealed that Delta 202 cells showed higher similarities to mouse hepatocytes
In addition, SDD metabolism was investigated in hepatocytes from castrated male rats treated with testosterone, prior to liver cell isolation. In male rat
The viability and differentiated properties of the hepatocytes cultured in the HARV were as pentoxyresorufin-O-dealkylase and testosterone 16β-hydroxylase. Subjects: Hepatocytes - metabolism Cytochrome P-450 CYP2B1 - metabolism
A toxicogenomic approach applied to hepatocyte cultures enabled .. 4A and 4C ) and significantly reduced metabolism of testosterone with
described in detail previously [16]. Testosterone hydro- xylation was measured in intact hepatocytes incubated for 30min with 250 mM testosterone. Metabolites
In the mouse hepatocyte cell line TAMH, FLU resulted in greater cytotoxicity than Due to low CYP activities in the TAMH cell line, metabolism and cytotoxicity
Hepatocytes as well as enterocytes were capable to metabolise ethoxyresorufin and ethoxycoumarin. With enterocyte cultures, the metabolism of testosterone
ly (i.e. testosterone metabolism, ECOD activity) could be incorporated. 3. Hepatocytes should be isolated from adult rats, which may have been pre-treated
When CP hepatocyte suspensions were permeabilized (with digitonin) and incubated with NADPH and ATP, testosterone metabolism was significantly
These first examples are from the testosterone target drug. Here we Differentiation of Xenobiotic Metabolism between Fresh and Cryo-preserved Hepatocytes
Production of Pregnenolone from Cholesterol and further metabolism 17- hydroxy progesterone and androstenedione, precursor to testosterone and estrone. to activate the Transient Receptor Potential M3 ion channel in hepatocytes and
and cytochrome P450 1A1 activity (EROD assay) over a 35 day period compared with hepatocyte only spheroids. Testosterone metabolism (HPLC) is increased
"In the present study, primary cultures of rat hepatocytes were treated for 48 and BROD, but not CYP3A23 mRNA or testosterone 6 beta-hydroxylation, Chang and colleagues published their study in Drug Metabolism and
Accurate and reproducible drug metabolism studies with SOVICYTE Human Cryopreserved Hepatocytes. Hepatocytes are provided to assess a drug candidate's metabolic stability, profile enzymes 3A4, Testosterone 6β- hydroxylation
For E. purpurea, testosterone metabolism showed a much lower CYP3A4 of the . activity of various hepatic drug-metabolizing enzymes in human hepatocyte
Testosterone Hydroxylation - Hydroxylation of testosterone to 6-β- hydroxytestosterone by CYP3As is characteristic of human hepatocytes (3). Figure 2 shows the
“Dexamethasone metabolism by human liver in vitro, metabolite .. ethylmorphine and testosterone in cultured hepatocytes from goats, sheep and cattle.
These substrates have been previously applied in P450 metabolism and inhibition studies . Until recently, primary cultures of human hepatocytes were the major tools to . activation and inhibition of diazepam and testosterone metabolism.
These include the major phase I drug metabolism enzyme family (P450) and phase II enzymes (UGT, SULT, GST, and NAT). Hepatocytes also contain all the
Determination of testosterone metabolites in human hepatocytes. I. Development of an on-line sample preparation liquid chromatography
'Regulation by growth hormone and glucocorticoid of testosterone metabolism in long-term cultures of hepatocytes from male and female rats.
Rifampicin induction of lidocaine metabolism in cultured human hepatocytes. . chloroxazone 6-hydroxylation, and testosterone 6b-hydroxylation. Chem. Biol.
active in the metabolism of xenobiotics with CYP 3A subfamilies being the most animals, strongly inhibited the hydroxylation rate of testosterone at the 6 beta position via mediate complex in both microsomes and hepatocytes. This report
Testosterone metabolism and EROD activity on cultured hepatocytes were conducted as described by Kostrubsky, et al.40 and Wen et al.41,
Activities of CYP3A (6-b-hydroxylation of testosterone). GST [substrate: .. hepatocytes should show metabolic activities similar to the in vivo situation [13, 45,
The suitability in terms of metabolic-competent hepatocyte cultures and in total CYP oxidative metabolism (7-ethoxycoumarin O-deethylation, total testosterone
Analysis of basal CYP activities and testosterone metabolism revealed that Delta 202 cells showed higher similarities to mouse hepatocytes than Hepa 1c1c7
Assessment of metabolic capacity using testosterone metabolism. Metabolic activity of fresh and cryopreserved dog hepatocyte suspensions. Cryopreservation
Auto-inhibition of verapamil metabolism in rat hepatocytes of gel entrapment by the formation rates of 6β-hydroxy testosterone and 1'-hydroxy midazolam.
The uptake and efflux of a drug into and from hepatocytes can determine the rate at which the molecule is metabolized and eliminated from the body. CYP3A4/5 Testosterone 6β-hydroxylation; UGT Glucronidation of Methylumbelliferone
REVIEW ON CRYOPRESERVED HEPATOCYTES. 83 allows the induction of testosterone metabolism with similar induction factors as for fresh cultures.
ratios of testosterone metabolites did not change on cryopreservation. 4. hepatocytes, the slicing technique is suitable for practically all mammalian livers
Thioredoxin and thioredoxin reductase can regulate cell metabolism through amounts in muscle and converts testosterone to dihydrotestosterone (DHT).
Hepatocyte growth factor (HGF) is a key regulator of satellite cell activity. Growth hormone helps to trigger fat metabolism for energy use in the muscle growth In addition, testosterone can increase the presence of neurotransmitters at the
Induction potential will be investigated using human hepatocytes and the the project to be a potent inhibitor of testosterone metabolism in humans as well as
aflatoxin B1 metabolism;; bovine hepatocytes;; bovine CYP450;; CYP450 2β- and 6β-hydroxy testosterone were purchased from Steraloids (Wilton, NH, USA).
Rifampin significantly increased testosterone metabolism in human hepatocytes. Treprostinil however, did not increase the metabolism of testosterone,
functionality of isolated hepatocytes and liver slices prepared either from healthy metabolism was studied using lidocaine and testosterone as sub- strates
The CYP3A drug metabolism activities of the hepatocytes were well maintained on assayed for CYP3A activity by testosterone 6-β-hydrox-. The procedures
Key words: long-term culture, hepatocytes, drug metabolism, enzyme regulation, induction In pure cultures, testosterone metabolism was drastically reduced.
21. Swales NJ, Johnson T, Caldwell J. Cryopreservation of rat and mouse hepatocytes. II Assessment of metabolic capacity using testosterone metabolism.
Testosterone metabolism in freshly isolated cultured and immortalized rat hepatocytes. 1995. The British Toxicology Society Joint BTS/IVTS Meeting. Oxford, UK.
extensive swollen hepatocytes, presence of enlarged nucleus and vacuolation of . Effect of AFB1 on liver microsomal testosterone metabolism. Microsomal
Pradefovir (1.63, 4.08, 16.3, or 40.8 μM) or testosterone (50 μM) was also incubated with . Enzyme induction study with primary cultures of human hepatocytes.
Most people associate testosterone with facial hair, gigantic muscles & illegal their effect on cholesterol metabolism in HepG2 hepatocytes.
Many drug-drug interactions are metabolism based and mediated primarily via the Cryopreserved human hepatocytes are an intact cell model system of the (acetaminophen and 6-β-OH-testosterone, respectively) relative to vehicle
Primary hepatocytes cultured as monolayers or as spheroids were studied Testosterone metabolism initially decreases in spheroids, but then
also testosterone metabolism is inducible by phenobarbitone and dexamethasone (Walker et al., 1999). Hepatocytes in spheroids also retain their ability to
hepatocytes, are responsible for this phenomenon. (152). A low protein diet may . Testosterone metabolism can be increased via hepatic enzyme induction by
metabolism is that, as a cellular system, hepatocytes contain many enzymes and enzyme Assessment of metabolic capacity using testosterone metabolism.
The purpose of this research was to establish the metabolic pathway of endosulfan .. Testosterone metabolites detected with endosulfan-treated hepatocyte S9
Cytochrome P450 metabolism can vary widely from one species to another, can be assessed by studying the in vitro metabolism of a drug by hepatocytes from a a comparison of alfentanil N-dealkylation and testosterone 6β- hydroxylation
Uremic substances Metabolism Microsomes. Hepatocytes Pharmacokinetics 3- Indoxylsulfate. 3-Indoleacetic acid Nicardipine Testosterone to
We show increased and idiosyncratic metabolism of testosterone in .. a gene expression in Aroclor 1254-treated rat hepatocyte cultures.
The primary site of metabolism for many drugs is the liver. Liver-derived systems such as liver slices, sub-cellular liver fractions, and intact hepatocytes are
to 2004 on hypogonadism, testosterone and metabolic syndrome was performed. Results: .. hepatocyte cell culture studies showing the inhibition of
Four samples were unsuitable to prepare hepatocytes. The profile of testosterone metabolism as 6.BETA.-, 2.BETA.-, 16.BETA.-, 16.ALPHA.- and 2.ALPHA.
tatic zinc metabolism, particularly those related to MT, are influenced by certain .. testosterone levels in carcinoma compared with benign hyper trophy (14). mary rat hepatocytes (6) or HeLa cells (21 ), there is a relatively large amount of
metabolic stability /2 time-Points (microsomes, s9, hepatocytes) metabolic stability (liver . cyP3a4 inhibition (recombinant, testosterone substrate). 0940
Metabolic stability of compound determined in cryopreserved hepatocytes from Standard compounds testosterone, midazolam, and 4-methylumbelliferone are
The generation of functional hepatocytes independent of donor liver organs Importantly, iHep cells metabolized phenacetin, testosterone and
We present a technique with cryopreserved hepatocytes that allows the induction of testosterone metabolism with similar induction factors as for fresh cultures.
Modulation of hepatic sterol and steroid metabolism is a plausible mode of action Comparison between liver and rat primary hepatocytes showed a targeted phase III transporters, and metabolism of testosterone are robust candidates for
Liver slices and hepatocytes from cynomolgus monkey liver showed comparable metabolic rates for the substrates tested, indicating that all
analyses of metabolic capacities of cryopreserved hepatocytes are often limited .. picin induced testosterone metabolism by 4.5-fold in fresh hepato- cytes but
cultures of rat hepatocytes, cultured on collagen films, gels and double gel cultures (sandwich configuration). The extent of testosterone metabolism, and the
In rat hepatocyte cultures CYP3A induction, as quantified by. 6ROH testosterone formation, was higher when cells were cultured in the absence of FCS.
The activity of CYP3A4 was determined by measuring the testosterone metabolism in cultured hepatocytes as described by Kostrubsky et al.,
fect the inactivation metabolism of irinotecan into 7-ethyl-10- droxytestosterone remained unaffected in other hepatocyte prep- arations.
Hepatocyte-1. Vitronectin e. Dil-ac-LDL. TTF+GFP. iHep. PA. S g f h. 1/8 1/4 1/2. 2 . 4. 8. 1. ICG i. Phenacetin metabolism. 0. 1. 2. 3. Testosterone metabolism. 0. 1
human hepatocytes as an experimental system for drug metabolism studies. . result of the stimulatory influence of testosterone and the suppressive effect of
Responsiveness of an SV40-immortalized hepatocyte cell line to growth hormone. of progestins on testosterone-stimulated hepatic ethylmorphine metabolism
'Cytochrome P450 induction and metabolism of alkoxyresorufins, ethylmorphine and testosterone in cultured hepatocytes from goats, sheep and cattle.
No differences in the metabolite profile of testosterone were found. a valuable source of human hepatocytes for drug metabolism studies.
metabolites of testosterone in the aetiology of hepatocellular carcinoma (HCC) is . The characterization of bile acid synthesis by cultured hamster hepatocytes
P Department of Drug Metabolism and Phamamkinetics,. Inducibility by a number Testosterone 6p-hydroxylation in human hepatocytes after. 96hrs in culture.
TESTOSTERONE METABOLISM IN RAT HEPATOCYTES IN PURE CULTURE OR . quantitative comparison of testosterone metabolism in hepatocytes in pure
(1997) examined the metabolism of testosterone in rat and human hepatocytes and found that most of the in vivo metabolites were also
BD Biosciences provides both fresh and cryopreserved hepatocytes to support major applications in drug and xenobiotic biotransformation. Drug Metabolism
The metabolic functionality of the isolated hepatocytes was assayed by measuring total CYP450 content, testosterone hydroxylation, EROD,
Heteroactivation by testosterone of the metabolism of benzodiazepines has been demonstrated in microsomes (Rawden et al. 2001), cryopreserved hepatocytes
Testosterone 6β-hydroxylation. Suspensions. Fresh suspended human hepatocytes are useful for short- term drug metabolism studies and are also suitable for
more relevant to humans, namely human hepatocytes, show induction of CYP isoforms by DEET, . effects on testosterone metabolism are being investigated.
metabolism. In both cultivated HepG2 hepatocytes and primary human monocyte -derived macrophages, testosterone led to a dose- dependent up-regulation of
cultured hepatocytes from genetically distinct mouse strains are feasible, we aimed to . oxidative metabolism of α-hydroxytestosterone and glucuronidation of
rat hepatocytes for use in metabolism and toxicity studies are used and
Similarly, decreased levels of 7-ethoxycoumarin O-deethylation and testosterone metabolism were observed in human hepatocyte cultures prepared from
Contains details of Cryopreservation of rat and mouse hepatocytes II Assessment of metabolic capacity using testosterone metabolism.
RESULTS: The pattern of specific cytochrome P450 activities and the metabolic profile of testosterone in intact hepatocytes were essentially the same as those
testosterone metabolites in culture media reflecting metabolic activity of cultured human and animal hepatocytes demonstrated [1]. In this following contribution
Hepatocyte growth factor (HGF) regulates many cellular functions that HGF significantly increases the amount of testosterone secreted by the
The mono- and diacylglycerides are metabolic intermediates in phospholipid Examples of steroid hormones are Testosterone and Progesterone, the male and . The cellular lipases of adipocytes and hepatocytes are under hormonal
Understand the metabolism of your compounds by using our S9 stability are predominantly focused on using hepatocytes or subcellular hepatic dependence of midazolam and testosterone on Phase I metabolism prior to
hepatocytes in rat following PH . When the serum testosterone concentration is 2 - 3 times of the physiological level, it facilitates transcriptional activity; while
(B) ALT released from different microencapsulated hepatocytes at various time points. (C) Differences in testosterone metabolism among
Phase I metabolism. Cellular system destroyed. Lack of cofactors. Limited Phase II metabolism. No active transport. Product inhibition. Hepatocytes. Pro:
Addition of T3 to primary hepatocytes resulted in a marked reduction of . Testosterone metabolites were separated by thin layer
Walsky and Obach, Drug Metabolism and Disposition, 2004; 32: 647-660. CYTOCHROME P450 INHIBITION CYP 3A4. (i) Testosterone. 6-β-OH- Testosterone
2 Carbohydrate & Lipid Metabolism/Synthesis in the Liver The lobules are composed of hepatocytes, which make up 70-80% of the mass of the . Examples of these would include testosterone, thyroxine and oestrogen.
Rat hepatocytes in primary culture can be stimulated to replicate under the Estrogen, testosterone, tryptophan, and vitamin E inhibited DNA synthesis by Several carcinogens requiring metabolic activation as well as the
The human hepatocytes were characterized for both testosterone-6β- hydroxylation for CYP3A4,
Publication » Cytochrome P450 induction and metabolism of alkoxyresorufins, ethylmorphine and testosterone in cultured hepatocytes from goats, sheep and
Overall clearance to metabolites was significantly greater in hepatocytes for testosterone (1.9- to 16.9-fold), 7-ethoxycoumarin (O-deethylation, 14.8-fold;
Fipronil can inhibit testosterone metabolism by CYP3A4 and is an effective inducer of CYP isoforms in human hepatocytes. Copyright © 2008
B1 Metabolism in Human Hepatocytes in Primary Culture' . The 6f3- hydroxylationof testosterone catalyzed by CYP3A4 was tested by incubating microsomal
method can determine metabolic stability using microsomes or hepatocytes from any species. foxide (DMSO) and testosterone were purchased from Sigma
Primary hepatocytes cultured as monolayers or as spheroids were studied to compare the also testosterone metabolism is inducible by phenobarbitone and
Determination of testosterone metabolites in rat hepatocytes with and without cryopreservation by on-line SPE column-switching LC and MS detection.
Modulation of hepatic sterol and steroid metabolism is a plausible mechanism for triazole induced increases in serum testosterone. The gene expression
Human hepatocytes play several key roles in preclinical drug development . 10 shows the inducibility of testosterone metabolism after treating
In contrast, testosterone metabolism was retained in primary hepatocytes in sandwich cultures at a higher level than in collagen film or gel cultures. Expression
The seven hydroxylated metabolites of testosterone produced by cultured hepatocytes were negligible in hepatoma cells. Exposure of cells to inducers revealed
Testosterone metabolism of non-cryopreserved (control) and cryopreserved (bold ) rat hepatocyte monolayer cultures treated with FCS90, FCS70, FCS05, and
Screening service for hepatocyte metabolic stability - assay protocol, data and the metabolic stability of ethoxycoumarin, 7-hydroxycoumarin, and testosterone
Testosterone metabolism in freshly isolated cultured and immortalized rat hepatocytes. The British Toxicology Society Joint BTS/IVTS Meeting. Oxford, UK. P38.
METHODS: Isolated porcine hepatocytes and a polymer solution composed of AN69 were was analyzed by Western blot and by testosterone 6-beta- hydroxylation assay. Browse drug metabolism articles via key phrases:
Protein metabolism (e.g. conversion of reporter compound to fluorescent product by hepatocyte cells) has also been .. Testosterone Metabolism by Fa2N4
the metabolism of around 70 % of therapeutic drugs and endogenous METHODS: Hepatocytes were isolated from liver specimens from hepatic angioma patients . conversion of testosterone to 6-hydroxytestosterone or N- demethylation of
vessels and perivenous hepatocytes around the efferent that a metabolic heterogeneity between hepatocytes .. Interaction of estrogen, testosterone
Hepatocyte specific function assays, namely albumin secretion, urea secretion, testosterone metabolism by HPLC and CYP activities by LC-MS-MS, were used
Human hepatocytes are being used in a broad range of in vitro studies including drug metabolism, drug-drug interaction, and cytotoxicity.
The lower rate of metabolism in slices compared with hepatocytes confirms our previous observations using testosterone, 7-ethoxycoumarin, 1-chloro-2
The male-specific testosterone 2alpha/16alpha- hydroxylase
receptor in preneoplastic hepatocytes, or by an indirect mech- anism, we chronically .. assay and testosterone is rapidly metabolized and excreted. (33). Also
Arsenic: metabolism and transport mechanisms in human hepatocytes. Arsenic: Cypermethrin exposure during puberty disrupts testosterone synthesis via
It is structurally similar to steroids such as testosterone, cholesterol, and cortisol ( though Hydroxylation in the endoplasmic reticulum of liver hepatocytes of Although cholecalciferol can be synthesized in the skin (see Metabolism), it is also
Hepatocytes were treated with antiretroviral drugs at a concentration of 10Ug/ml once every day for 4 days. On day 4, the metabolism of testosterone (250UM),
Determination of testosterone metabolites in human hepatocytes: I. Development of an on-line sample preparation liquid chromatography technique and mass
hepatocytes in primary culture, was to examine directly whether hormonal factors .. Testosterone metabolites were separated by thin layer chromatography and
7 days. 10 days p m o l/m g p ro tein. 2D. Hi-Spot. 2D6 Metabolism. Bufuralol. Total Testosterone Metabolism in Human Hepatocytes. (Lot 91 August 21, 2006). 0
It regulates insulin metabolism and stimulates protein synthesis. There are two forms, Hepatocyte Growth Factor HGF is a Testosterone affects the nervous system, skeletal muscle, bone marrow, skin, hair and the sex organs. With skeletal
The metabolism of [14C]BMS-299897 was investigated in human liver microsomes, in rat, dog, monkey and human hepatocytes and in bile duct cannulated rats.
Cryopreservation of viable hepatocyte monolayers in cryoprotectant media with content: metabolism of testosterone and kaempherol post-cryopreservation.
It has been established that unsaturated fats suppress the metabolic rate, " Effects of magnesium and iron on lipid peroxidation in cultured hepatocytes," Mol. .. -EPA and DHA inhibited gonadotropin-stimulated testosterone production in a
The key events involved in the disruption in testosterone homeostasis and an inhibitor of the mevalonate pathway that alters lipid metabolism, to assess
(B(a)P), on the testosterone metabolism in the invertebrate Neomysis integer P4501A induction and testosterone hydroxylation in cultured hepatocytes of
The gold standard in vitro model to assess induction is primary hepatocytes. . Liquid Chromatography Testosterone Metabolism Assay to Assess Changes in
Cryopreserved hepatocytes were rapidly dissolved at 37 ℃ in culture medium. of testosterone and phenacetin were determined by HPLC and metabolic rate
Primary hepatocytes: Current understanding of the regulation of metabolic Progesterone and testosterone hydroxylation by cytochromes P450 2C19, 2C9 and
metabolites of xenobiotics produced by mixed-function oxygenases .. Treatment of co-cultured hepatocytes with testosterone or with 5α-DHT had no significant
The activity of CYP3A4 was determined by measuring the testosterone metabolism in cultured hepatocytes as described by Kostrubsky et al.
Species Differences in the Metabolism of Benzo(A)Pyrene and Testosterone by Isolated Hepatocytes. Date: 11 Sep 1988 (est.) Length: 1 page 2028900635
fresh and CP hepatocytes. 4. The pro®le of testosterone metabolism was unaåected by freezing. Total hydroxylase activities were 815‰33 pmol} min} 10' cells
production we also investigated the metabolic compe- tence of porcine and human hepatocyte cultures based on their ability to metabolize testosterone. Further
by the formation rates of 6β-hydroxy testosterone and 1'-hydroxy midazolam.
to the apparent inhibition of microsomal P-450 enzyme responsible for the metabolism of testosterone in the diseased hepatocytes. •. Die Leber spielt bei der
Enzyme Induction in Rat Primary Hepatocytes.
Cryopreservation of viable hepatocyte monolayers in cryoprotectant media with high serum content: metabolism of testosterone and kaempherol post-
Hepatic material: Individual CYP isoforms, S9, microsomes, hepatocytes. • Extra- hepatic material: skin and Interspecies variation in metabolic profiles ( qualitative or quantitative). Test systems Testosterone for CYP3A. • S- mephenytoine for
The UK Human Tissue Bank provides fresh hepatocytes - plated or in suspension and characterisaed crypreserved hepatocytes for metabolism or induction are assayed for induction with Ethoxyresorufin (BNF) and Testosterone (RIF).
Keywords: Tissue engineering, foams, rat hepatocytes, lactose, heparin, testosterone metabolism Received 2 November 1994; accepted 22 May 1995 The
Determination of testosterone metabolites in human hepatocytes. I. Development of an online sample preparation liquid chromatography technique and mass
hepatocytes, individual cryopreserved hepatocytes, or pre-pooled cryopreserved hepatocytes in the metabolism of high, moderate and low cleared compounds
The use of cryopreserved hepatocytes has increased in the last decade due to the Assessment of metabolic capacity using testosterone metabolism.
Cryopreserved human hepatocytes represent a convenient and biologically relevant model to mitigate this a pool of cryopreserved human hepatocytes as a model for drug metabolism studies. . Hepatocytes. *Testosterone 6β- hydroxylation
Metabolism. Ask the expert. Q. What are the benefits of using cryopreserved hepatocytes, and how does the activity of freshly isolated
Testosterone metabolites in methanol for standard curve (see recipe and Table . derivatives on cytochromes P450 from human hepatocytes in primary culture.
Alcohol is directly toxic to the testes; causing reduced testosterone levels.The present study was metabolism, liver cirrhosis and hormonal changes associated
The Nuclear Receptors in Metabolism page provides a portal to the pages discussing Type 2A: Hepatocyte Nuclear Factor-4 (HNF4) Receptors the androgen hormone, androsterone, derived via testosterone metabolism.
sion of metabolism enzymes after hepatocyte exposure to xenobiotics, and conventional probe substrates (bupropion HCL and testosterone)
S9 fractions were collected from the hepatocytes and used for testosterone metabolism……………………………………………….…………………86
mediated insulin degradation were investigated in hepatocytes could therefore contrib- ute to altered insulin metabolism and hyperinsulinemia in some . ing a- day-old female pups with 1.0 mg testosterone propionate in corn oil
e TH, testosterone hydroxylation. New Hepatocyte In Vitro Systems for Drug Metabolism. 149. MARCEL DEKKER, INC. • 270 MADISON AVENUE • NEW YORK,
These hepatocyte studies showed that rodent hepatocytes were able to metabolise Compound Ain vitro. In males, testosterone metabolism was almost totally
Regulation of HepG2 cell apolipoprotein B metabolism by the citrus .. synthesis in human hepatoma cells: Mechanism of antagonism by testosterone. Proc.
Prediction of metabolic clearance using fresh human hepatocytes: Comparison with The effect of heteroactivation by testosterone in human liver microsomes.
Skin metabolism is qualitatively different from liver metabolism (microsomes and hepatocytes). METABOLITE PROFILES OF [4, 14C]-TESTOSTERONE
The inhibition of formation of resorufin and 6β-hydroxytestosterone by 3- indoxylsulfate was also observed in human hepatocytes. The elimination of nicardipine
Preserved, Non-Frozen Hepatocytes as a Robust and Convenient System for in vitro II metabolism and poor plating efficiency. 6β-OH Testosterone. 72.8
The aim of this investigation was to define the in vitro conditions necessary to support cytochrome P450-mediated metabolism in rat cultured hepatocytes, such
Regulation by growth hormone and glucocorticoid of testosterone metabolism in long-term cultures of hepatocytes from male and female rats. Constance Vind
ences in metabolic abilities, fresh h-hepatocytes are a bet- ter model for predicting the toin, dextromethorphan, chlorzoxazone, testosterone, ketoprofen , and
Table 1 Testosterone metabolism in rat hepatocytes, B-13 cells and B-13/H cells. Results are the means±S.D. of the rate of metabolite production from three
Overview; Metabolism of Drugs; Clinical and Pathological . Apoptosis of hepatocytes: Activation of the apoptotic pathways by the tumor necrosis . reaction include anabolic steroids (eg, methyl testosterone, oxymetholone,
Cryopreservation of viable hepatocyte monolayers in cryoprotectant media with high serum content: metabolism of testosterone and
Hepatocyte functions were evaluated by testosterone metabolism and transportation of tritiated- taurocholic acid and carboxy-dichlorofluorescein diacetate
In addition, direct conjugation of testosterone by phase-II metabolizing . was characterized by increased size and cytoplasmic eosinophilia of hepatocytes that
Testosterone metabolism and formation of cytosol Study on the role of glutathione in the biotransformation and toxicity of furazolidone using pig hepatocytes.
Hepatic Metabolism. CYPs are found in the smooth endoplasmic reticulum (ER). Hepatocytes contain the full complement of the major DMEs including cytosolic
In human cultures, metabolism of testosterone to four different hydroxy metabolites is reduced by up to 90% in human hepatocytes after 2 days in co- culture or
of the testosterone metabolites measured in the presence of either ion,
Keywords: Hepatocytes; tissue engineering; p450; transcription factors; testosterone metabolism; RT-PCR; nuclear receptors; induction;
The use of human hepatocyte cultures to study the induction of cytochrome testosterone 6beta-hydroxylase activity, amount of CYP3A protein, and total Induction of the metabolism of midazolam by rifampin in cultured porcine hepatocytes:
Toxicogenomics applied to cultures of human hepatocytes enabled an synthesis, urea and testosterone metabolism to assay for CYP monooxygenase activity.
In a study to monitor its oral availability and to identify the sites of metabolism, .. increase in the incidence of foci of altered hepatocytes and hepatic nodules
metabolism activities of cultured human hepatocytes may significantly . rates of testosterone hydroxylation at different positions observed in
I metabolism QC : TEC and testosterone as standard, but up to 9 enzyme activities can be measured (see below). I human hepatocytes incubated in suspension
CYP3A4 testosterone to 6 beta- testosterone conversion activity of C3A human hepatocyte cell line · Increased cytochrome
1 Introduction; 2 Materials; 2.1 Liver Perfusion; 2.2 Hepatocyte Isolation . cytochrome P450 enzymes, a primary route of metabolism for many pharmaceuticals. . and Parkinson, A. (1987) Regulation of testosterone hydroxylation by rat liver
(1992) Vind et al. Biochemical Pharmacology. Read by researchers in: 100% Biological Sciences. The activities of 2-, 6 beta-, 7 alpha- and 16
After incubation of bovine hepatocytes with methyltestosterone for 24 h, culture Media, Conditioned/metabolism; Gas Chromatography-Mass Spectrometry
Collagen coating improves the maintenance of hepatocytes on polymeric Testosterone metabolism was more extensive in cells cultured on
We present a technique with cryopreserved hepatocytes that allows the induction of testosterone metabolism with similar induction factors as for fresh cultures.
the metabolic capacity of fresh and CP rat and mouse hepatocytes in primary cufture. Total cytochrome. P450 (P450) con- tents and metabolism of testosterone
testosterone metabolism by this protocol is also a very sensitive method to detect the inhibition of CYP3A4 by .. by chemicals of interest in human hepatocytes
Many drug-drug interactions are metabolism based and mediated primarily via Cryopreserved human hepatocyte cultures from three individual donors are used β-OH-testosterone, respectively) relative to vehicle control cells (un-induced).
Evidence for the presence of hepatocyte growth factor expression in human ovarianfollicles. Y Osuga, O Testosterone - metabolism [89 related records]
iCell Hepatocytes will provide, for the first time, access to commercial quantities of high activity (metabolism of testosterone substrate) was assayed by mass
The use of both rat and human hepatocyte culture for the prediction of in . not inhibit the metabolism of testosterone to 6β-hydroxytestosterone
hepatoma cell lines at similar levels to those found in hepatocytes (684 ? 56 nmol /mg X min). The seven hydroxylated metabolites of testosterone produced by
Title. Further characterization of autologous NeoHepatocytes for in vitro toxicity testing Bio-transformation rates, assessed by testosterone metabolism, were
assessed for stability in rat cryopreserved hepatocytes. this may be due to metabolic N-dealkylation of the amide side-chain, whilst the higher lipophilicity
Contains details of Cryopreservation rat mouse hepatocytes II Assessment metabolic capacity testosterone metabolism.
Determination of testosterone metabolites in human hepatocytes. I. Development of an on-line sample preparation liquid chromatography technique and mass
This invention relates to virally-immortalized hepatocyte cell lines, which 10 shows the inducibility of testosterone metabolism after treating
Prediction of metabolic clearance using fresh human hepatocytes: Comparison with (by testosterone, up to 14-fold) among the major pathways was observed.
observed interindividual variability in oxazaphosphorine metabolism. For example .. in CYP3A-catalyzed hepatocyte microsomal testosterone 6j3-hydrox
Unger J. , Catapano G. , Lakhal M. , Gerlach J. , Rossaint R. , " Testosterone Metabolism of Primary Pig Hepatocytes Standard Mnonlayer Versus Medium
surprisingly, little is known about the metabolic capacity of heart muscle cells. .. Figure 6 Testosterone metabolism in cardiomyocytes (a) and hepatocytes (b)
Major pathways for testosterone metabolism in the liver, including hydroxylation, . P4503A induction in primary cultures of rat, rabbit, and human hepatocytes.
In this work, ultra-high-viscosity alginate was used for hepatocyte . Testosterone is regio- and stereoselectively metabolized by CYPs to
hepatocytes in vitro and concomitantly preserving their differentiated hepatic functions was analyzed. . Determination of testosterone metabolites.
The activity of CYP3A4 was determined by measuring the testosterone metabolism in cultured hepatocytes treated with vehicle (defined as basal controls) or
16α‐OHT was present in all incubations except for ox microsomes. The rate of metabolism of testosterone was generally lower in microsomes than hepatocytes,
5.3.4 Assay of Testosterone. . cytochrome P450 ( CYP) forms have a major role in the metabolism of drugs and other chemicals.
Phase 2 enzymes.4 CYP3A activity was measured by the metabolism of testosterone to. 6β-hydroxytestosterone. As shown in Figure 1A, mouse hepatocytes
Human hepatocytes with at least one CYP3A5*1 allele also metabolized vincristine, albeit at a slower rate (10-fold) .. Vincristine and Testosterone Incubations.
Human hepatocytes for studies of overall metabolism (phase I and phase II) and and their metabolites as well as testosterone, estradiol and JP-8 components
van't Klooster et al., Cytochrome p450 induction and metabolism of alkoxyresorufins, ethylmorphine and testosterone in cultured hepatocytes from goats, sheep
CYPs are the major enzymes involved in drug metabolism and bioactivation, . breakdown (including estrogen and testosterone synthesis and metabolism),
that significant amounts of testosterone metabolites were retained within the enterocytes is estimated to be 1.7 to 2.9 times higher than that in hepatocytes.
cytosol, S9 fraction, cell lines, transgenic cell lines, primary hepatocytes, liver slices, and perfused liver. A general . Testosterone C6-ß-hydroxylation. Preferred the adsorption disposition metabolism elimination of a drug is essential in the
Rat hepatocytes were cultured initially as spheroids on culture plates and .. The metabolism of testosterone is a useful assay to determine the
By treating the hepatocytes with an inducer or inhibitor of metabolism by the . testosterone to 6β-OH testosterone was measured via HPLC to confirm. CYP3A4
Simultaneous Assessment of Uptake and Metabolism in Rat Hepatocytes: A .. Activation and Inhibition of Diazepam and testosterone metabolism. Drug Metab.
testosterone in human hepatocytes treated with phthalates and Dex. As shown activity may lead to alterations in metabolism, resulting in deleterious drug-drug
more relevant to htunans, namely human hepatocytes, show induction of CYP isoforms by DEET, . effects on testosterone metabolism are being investigated.
specific substrate, such as the conversion of testosterone to 6ß- hydroxytestosterone by CYP3A. This method utilizes intact human hepatocytes for metabolic
Primary cultures of human hepatocytes. Wed, 24 Aug 2011 12:27:41 | Drug Metabolism. Primary cultures of human hepatocytes have been considered by most
Testosterone Metabolism Profiles by Primary Human Hepatocytes. The oxidative metabolism of testosterone was analyzed to estimate drug-metabolizing
The rate of metabolism of testosterone was generally lower in microsomes than hepatocytes, with the exception of the ox, but the pattern and
A Human Hepatocyte Cell Line—By Tissue Engineering. Within Alginate . Testosterone is metabolized by CYP3A4 yielding 6 - testosterone as a major
Drug Metabolism in Hepatocyte Sandwich Cultures. 767. FIG. 5. Testosterone hydroxylation and formation of androstenedione (A) in primary cultures of human
This is well illustrated by the comparison of the metabolic profile of testosterone hydroxylated metabolites in cultured hepatocytes and liver microsomes,
Primary porcine hepatocytes. Testosterone. Biotransformation. Albumin. Metabolites. CYP activity. Metabolism. a b s t r a c t. Interspecies difference is an
( C ) Differences in testosterone metabolism among different microencapsulated hepatocytes at various time points. All data points are presented as mean ± SD.
Enzyme Induction In Freshly Isolated Human Hepatocytes . other laboratory animals by immunochemical analysis and by analysis of testosterone metabolism .
4-Intracellular transport in hepatocytes. 5-Conjugation with glucuronic acid. 6- Secretion into bile ducts. 7- Intestinal metabolism. 8- Renal excretion of bilirubin
The formation of testosterone hydroxy (OHT) metabolites (namely 6b-OHT, 2b- CP monkey hepatocytes are a useful model for metabolic and cytotoxicity
Use of human hepatocytes to study drug metabolism and drug transport . . 13 Effect of silybin on testosterone metabolism in human hepatocytes.
and testosterone metabolism are altered in cardiac . Metabolism of testosterone androstane receptor expression in human hepatocytes: conse- quences
TESTOSTERONE METABOLISM IN RAT HEPATOCYTES IN PURE CULTURE OR CO-CULTURED WITH MS CELLS °. Days of Culture. Activity. 0. 1. 3. 7. 15~-
Examination of testosterone metabolism in hepatocyte cultures revealed that DMSO pretreatment increased CYP3A-catalyzed 2beta- and
(1992) “ Regulation By Growth Hormone And Glucocorticoid Of Testosterone Metabolism In Long - Term Cultures Of Hepatocytes From Male
Publication » Auto-inhibition of verapamil metabolism in rat hepatocytes of gel by the formation rates of 6β-hydroxy testosterone and 1'-hydroxy midazolam.
the testosterone metabolism in cultured hepatocytes as described by. Kostrubsky et al. (17). Cells were then scraped from the plates and proteins analyzed on
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