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http://dx.doi.org/10.14348/molcells.2020.0100

HIF-1α-Dependent Induction of Carboxypeptidase A4 and Carboxypeptidase E in Hypoxic Human Adipose-Derived Stem Cells  

Moon, Yunwon (Department of Life Science, University of Seoul)
Moon, Ramhee (Department of Life Science, University of Seoul)
Roh, Hyunsoo (Department of Life Science, University of Seoul)
Chang, Soojeong (Department of Life Science, University of Seoul)
Lee, Seongyeol (Department of Life Science, University of Seoul)
Park, Hyunsung (Department of Life Science, University of Seoul)
Publication Information
Molecules and Cells / v.43, no.11, 2020 , pp. 945-952 More about this Journal
Abstract
Hypoxia induces the expression of several genes through the activation of a master transcription factor, hypoxia-inducible factor (HIF)-1α. This study shows that hypoxia strongly induced the expression of two carboxypeptidases (CP), CPA4 and CPE, in an HIF-1α-dependent manner. The hypoxic induction of CPA4 and CPE gene was accompanied by the recruitment of HIF-1α and upregulation in the active histone modification, H3K4me3, at their promoter regions. The hypoxic responsiveness of CPA4 and CPE genes was observed in human adipocytes, human adipose-derived stem cells, and human primary fibroblasts but not mouse primary adipocyte progenitor cells. CPA4 and CPE have been identified as secreted exopeptidases that degrade and process other secreted proteins and matrix proteins. This finding suggests that hypoxia changes the microenvironment of the obese hypoxic adipose tissue by inducing the expression of not only adipokines but also peptidases such as CPA4 and CPE.
Keywords
carboxypeptidase A4; carboxypeptidase E; human adipose-derived stem cells; hypoxia; hypoxia-inducible factor-$1{\alpha}$;
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