Cell-specific regulation of transcription of the malic enzyme gene: characterization of cis-acting elements that modulate nuclear T3 receptor activity

Archives of Biochemistry and Biophysics
X Fang, F Bradley Hillgartner

Abstract

Stimulation of malic enzyme transcription by triiodothyronine (T3) is robust (> 60-fold) in chick embryo hepatocytes, weak (5-fold) in chick embryo fibroblasts that stably overexpress the nuclear T3 receptor-alpha, and still weaker (1-fold) in chick embryo fibroblasts which contain nuclear T3 receptor levels that are similar to those of chick embryo hepatocytes. Using DNase I hypersensitivity, functional transfection, and in vitro DNA-binding analyses, four cis-acting elements were identified in the malic enzyme 5'-flanking DNA that conferred differences in nuclear T3 receptor activity between chick embryo hepatocytes and chick embryo fibroblasts. These cell-specific regulatory elements are located at -3895/-3890, -3761/-3744, -3703/-3686, and -3474/-2715 bp and overlap with DNase I hypersensitive sites that are observed in chromatin of chick embryo hepatocytes. Each element enhances T3 responsiveness of the malic enzyme promoter in chick embryo hepatocytes but has no effect on T3 responsiveness in chick embryo fibroblasts. Three of the cell-specific regulatory elements flank a previously identified DNA fragment (-3889 to -3769 bp; Hodnett et al., Arch. Biochem. Biophys. 334, 309-324, 1996) that contains one major and four mino...Continue Reading

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Citations

Jun 6, 2012·PloS One·Ruymán Santana-FarréLeandro Fernández-Pérez
May 18, 2016·Asian-Australasian Journal of Animal Sciences·Lihuai YuHongrong Wang
May 13, 1999·Thyroid : Official Journal of the American Thyroid Association·M K BhatS Y Cheng

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