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Factors influencing hydroxylations of labeled steroid precursors by different rat adrenal preparationsLee, David S. January 1970 (has links)
No description available.
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ACTH Increases Expression of c-fos, c-jun and β-actin Genes in the Dexamethasone-treated Rat AdrenalsMATSUI, NOBUO, TAKAGI, HIROSHI, FUNAHASHI, HIROOMI, SATOH, YASUYUKI, MIYAMOTO, NORIHIRO, MURATA, YOSHIHARU, IMAI, TSUNEO, SEO, HISAO, OHNO, MOTOTSUGU 08 1900 (has links)
名古屋大学博士学位論文 学位の種類 : 医学博士(論文) 学位授与年月日:平成4年9月22日 大野元嗣氏の博士論文として提出された
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Regulation of Tyrosine Hydroxylase Expression by Hypoxia: Study of O2-Sensitive Rat Adrenal Chromaffin MAH Cell LineLiu, Jingjing 10 1900 (has links)
<p> Reduced oxygen tension (i.e. hypoxia) regulates gene expression in various
chromaffin cell types that synthesize catecholamines. In this study, the effect of
chronic hypoxia on tyrosine hydroxylase (TH) mRNA and protein expression was
investigated in the adrenomedullary chromaffin MAH cell line. RT-PCR results
indicated that TH mRNA was expressed in MAH cells both during normoxia (20%
0 2) and hypoxia (5% 02). However, TH mRNA expression during chronic hypoxia
was significantly higher than that during normoxia, increasing by approximately 2- fold after 16 hour exposure to chronic hypoxia. Western Blot analysis of the
regulation of TH gene expression by chronic hypoxia indicated that TH protein
initially decreased during 10 hr exposure to hypoxia and this was followed by a
rapid increase in expression over the next 10 hr, and then by a slower increase (up to 1.3x initial control) after 72 hr exposure. Therefore, TH mRNA and protein
levels were changed in MAH cells by hypoxia in a time-dependent manner.
Surprisingly, cobalt treatment of MAH cells, expected to mimic the effects of
chronic hypoxia, had little effect on TH gene expression. Interestingly, the decrease in TH expression protein after 10 hr exposure to hypoxia was prevented by nifedipine, an L-type calcium channel blocker. These results suggest that MAH
cells represent a useful model system for examining hypoxia-induced gene
regulation in an 02-sensitive cell line. Additionally, preliminary studies on HIF-1a
expression in MAH cells showed that HIF-la mRNA was expressed and remained
stable under both hypoxic and normoxic conditions. </p> / Thesis / Master of Science (MSc)
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