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- W2149081105 abstract "Translocator protein (18 kDa; TSPO) is a mitochondrial cholesterol- and drug-binding protein involved in cholesterol import into mitochondria, the rate-limiting step in steroidogenesis. TSPO is expressed at high levels in Leydig cells of the testis, and its expression levels dictate the ability of the cells to form androgen. In search of mechanisms that regulate Tspo expression, a number of transcription factors acting on its promoter region have been identified. We report herein the presence of a mechanism of regulation of Tspo expression via complementation with a natural antisense transcript (NAT). At the Tspo locus, a short interspersed repetitive element (SINE) of the SINE B2 family has the potential for high transcriptional activity. The extension of the SINE B2 element-mediated transcript overlapped with exon 3 of the Tspo gene and formed a NAT specific for Tspo (Tspo-NAT) in MA-10 mouse tumor Leydig cells. The identified Tspo-NAT was also found in testis and kidney tissues. Overexpression of the Tspo-NAT regulated Tspo gene expression and its function in steroid formation in MA-10 cells. Time-course studies have indicated that Tspo-NAT expression is regulated by cAMP and could regulate TSPO levels to maintain optimal steroid production by MA-10 Leydig cells. Taken together, these results suggest a new micro-transcriptional mechanism that regulates Tspo expression and thus steroidogenesis via an intron-based SINE B2-driven NAT specific for the Tspo gene." @default.
- W2149081105 created "2016-06-24" @default.
- W2149081105 creator A5016102256 @default.
- W2149081105 creator A5058801218 @default.
- W2149081105 date "2012-05-01" @default.
- W2149081105 modified "2023-09-26" @default.
- W2149081105 title "Transcriptional Regulation of Translocator Protein (Tspo) via a SINE B2-Mediated Natural Antisense Transcript in MA-10 Leydig Cells1" @default.
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- W2149081105 doi "https://doi.org/10.1095/biolreprod.111.097535" @default.
- W2149081105 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3364927" @default.
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