نتایج جستجو برای: cyp3a4 induction
تعداد نتایج: 201197 فیلتر نتایج به سال:
Dehydroepiandrosterone (DHEA), the major precursor of androgens and estrogens, has several beneficial effects on the immune system, on memory function, and in modulating the effects of diabetes, obesity, and chemical carcinogenesis. Treatment of rats with DHEA influences expression of cytochrome P450 (P450) genes, including peroxisome proliferator-activated receptor alpha (PPAR alpha)- and preg...
Several cytochrome P450 (CYP) enzymes are expressed in the human lung, where they participate in metabolic inactivation and activation of numerous exogenous and endogenous compounds. In this study, the expression pattern of all known xenobiotic-metabolizing CYP genes was characterized in the human alveolar type II cell-derived A549 adenocarcinoma cell line using qualitative reverse transcriptas...
آنزیمهای cypa انسانی در مقایسه با هر انزیم متابولیزه کننده دیگر نقش مهمی در متابولیسم و حذف بسیاری از داروها دارند. نشان داده شده است که متابولیسم حدود 50% داروها توسط آنزیم cyp3a4 صورت می گیرد. سوبسترای این آنزیم شام داروها و مواد اندوژنوس می باشند. بنابراین، هر گونه تغییر نوکلئوتیدی در ناحیه کد کننده این ژن باعث افزایش خطر ابتلا به سرطان می گردد. مهمترین تغییر نوکلئوتیدی که باعث جابجائی a به...
The acylated phloroglucinol, hyperforin, the main active ingredient of St. John’s Wort, exerts antidepressant properties via indirect inhibition of serotonin reuptake by selectively activating the canonical transient receptor potential channel 6 (TRPC6). Hyperforin treatment can lead to drug–drug interactions due to potent activation of the nuclear receptor PXR (NR1I2), a key transcriptional re...
The acylated phloroglucinol, hyperforin, the main active ingredient of St. John's Wort, exerts antidepressant properties via indirect inhibition of serotonin reuptake by selectively activating the canonical transient receptor potential channel 6 (TRPC6). Hyperforin treatment can lead to drug-drug interactions due to potent activation of the nuclear receptor PXR (NR1I2), a key transcriptional re...
Artemisinin drugs are of utmost importance in the treatment of malaria, because they represent the sole class of therapeutically used antimalarial drugs to which malaria parasites have not yet developed resistance. The major disadvantage of these medicines is the comparatively high recrudescence rate, which has been attributed to the remarkable decrease of artemisinin plasma concentrations duri...
the activity of cytochrome p450 isozyme 3a4 (cyp3a4) enzyme and p-glycoprotein (p-gp) is modulated by grapefruit juice and herbal drugs. cyp3a4 is the major phase i drug metabolizing enzyme and p-gp is an atp-dependent drug efflux pump that regulates the intestinal absorption of orally administered drugs. honey is commonly consumed as a dietary supplement. however, its influence on human cyp3a4...
The pregnane X receptor (PXR)/steroid and xenobiotic receptor (SXR) transcriptionally activates cytochrome P4503A4 (CYP3A4) when ligand activated by endobiotics and xenobiotics. We cloned the human PXR gene and analysed the sequence in DNAs of individuals whose CYP3A phenotype was known. The PXR gene spans 35 kb, contains nine exons, and mapped to chromosome 13q11-13. Thirty-eight single nucleo...
Pregnane X receptor (PXR) has been shown to form a heterodimer with retinoid X receptor alpha (RXRalpha) and to bind to the distal nuclear receptor-binding element 1 and an everted repeat separated by six nucleotides in the proximal promoter of the CYP3A4 gene. In the present study, a new rifampicin-responsive region, located at -7.6 kilobases upstream from the transcription initiation site, ha...
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