Identification of Rhit as a novel transcriptional repressor of human Mpv17-like protein with a mitigating effect on mitochondrial dysfunction, and its transcriptional regulation by FOXD3 and GABP

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• 作者：Reiko Iida^a ; ^b ; ^{riida@u-fukui.ac.jp} ; Misuzu Ueki^c ; Toshihiro Yasuda^c
• 关键词：M-LP ; Mpv17-like protein ; M-LPH ; human Mpv17-like protein ; Rhit ; regulator of heat-induced transcription ; RhitH ; human regulator of heat-induced transcription ; ZNF205 ; zinc-finger protein 205 ; FOXD3 ; forkhead box D3 ; GABP ; GA-binding protein ; KRAB ; Kr&uum
• 刊名：Free Radical Biology and Medicine
• 出版年：2012
• 期刊代码：105_08915849
• 类别：med
• 出版时间：15 April, 2012
• 卷：52
• 期：8
• 页码：1413-1422
• 文件大小：1095 K

摘要

Mpv17-like protein (M-LP) is a protein that has been suggested to be involved in the metabolism of reactive oxygen species. To elucidate the molecular basis of M-LP expression, we recently searched for regulatory elements of M-LP and identified a novel mouse KRAB-containing protein, Rhit (regulator of heat-induced transcription), as a repressor of the transcriptional regulation of M-LP. In this study, we identified zinc-finger protein 205 as a candidate human Rhit (RhitH) and subsequently confirmed its participation in transcriptional regulation of human M-LP (M-LPH). To clarify the functions of RhitH and M-LPH, we searched for cis-regulatory elements in the promoter region of RhitH and identified two transcription factors: forkhead box D3, as a negative regulatory element, and GA-binding protein, one of the key regulators of the mitochondrial electron transport system, as a positive regulatory element. Additionally, it was demonstrated that knockdown of RhitH or overexpression of M-LPH reduces the generation of intracellular H₂O₂ and loss of mitochondrial membrane potential caused by an inhibitor of the respiratory chain, antimycin A. These results suggest that M-LPH functions to protect cells from oxidative stress and/or initiation of the mitochondrial apoptotic cascade under stressed conditions.