کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9034752 | 1132641 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
In vivo effects of protein kinase and phosphatase inhibitors on CYP2B induction in rat liver
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کلمات کلیدی
TCPOBOP7-pentoxyresorufin O-dealkylase1,4-bis[2-(3,5-dichloropyridyloxy)]benzenePRODPBREMCYP2BRXRRetinoid X receptordb-cAMPRT-PCRGAPDHTPDOkadaic acid - اسید اوکادائیکInduction - القاءPhenobarbital - فنوباربیتالCAR - ماشینReverse transcriptase-polymerase chain reaction - واکنش زنجیره ای واکنش زنجیره ای واکنش زنجیره ایRat liver - کبد چربglyceraldehydes-3-phosphate dehydrogenase - گلیسرالید هیدروژن 3-فسفات دهیدروژنازconstitutive androstane receptor - گیرنده آندروستان پایدار
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم محیط زیست
بهداشت، سم شناسی و جهش زایی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Effects of inhibiting protein kinases and phosphatases on induction of CYP2B by triphenyldioxane (TPD) and phenobarbital (PB) were investigated. Male Wistar rats were treated with test inhibitors before TPD or PB administration. Inhibitors of phosphatidylinositol-3-kinase (Wortmannin) and protein kinase C (bisindolylmaleimide I) did not have appreciable effects on TPD- or PB-induced pentoxyresorufin O-dealkylase (PROD) activity specific for CYP2B, although bisindolylmaleimide I did give substantial induction alone. W-7, an inhibitor of Ca2+/calmodulin-dependent kinase II, produced a 6-fold increase in the TPD-induced PROD activity and did not lead to a significant increase in basal PROD activity. Treatment of rats with okadaic acid (OA), an inhibitor of protein phosphatases PP1 and PP2A, caused considerable decreases in PROD activity during the induction by TPD and PB (8- and 2.5-fold, respectively). Results of multiplex RT-PCR showed that the increase in enzymatic activity from W7 and OA treatment reflected at least in part increased mRNA levels. CYP2B mRNA level in the liver of rats treated with W-7 and TPD was 1.5 times higher than in the liver of TPD-treated rats. This effect was not observed for PB-induction. OA treatment caused a decrease of the CYP2B mRNA levels of 44% and 33% respectively, for TPD- and PB-induction. Thus, our results are consistent with the hypothesis that phosphorylation/dephosphorylation signaling pathways are involved in regulation of CYP2B induction in rat liver.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Toxicology - Volume 207, Issue 2, 14 February 2005, Pages 315-322
Journal: Toxicology - Volume 207, Issue 2, 14 February 2005, Pages 315-322
نویسندگان
Vladimir O. Pustylnyak, Lyudmila Yu. Zakharova, Olga N. Mikhailova, Robert H. Rice, Lyudmila F. Gulyaeva, Vyacheslav V. Lyakhovich,