Regulation of the Human Ghrelin Promoter Activity by Transcription Factors, NF-κB and Nkx2.2.

Abstract:

:To examine the gene expression of ghrelin, a growth hormone releasing and appetite stimulating hormone from stomach, we constructed human ghrelin promoter-reporter vectors and analyzed the promoter activity. The ghrelin promoter activity was high when cultured cells that express ghrelin mRNA endogenously like TT or ECC10 cells were used, indicating that these cells contain factors necessary for full expression of the human ghrelin gene. The human ghrelin promoter contains both positive and negative regulatory regions. A transient decrease of the promoter activity was found when the reporter vector with the -1600 fragment of the human ghrelin promoter was transfected into cultured cells. We then examined the effect of several transcription factors on the ghrelin promoter activity and found that NF-κB suppressed and that Nkx2.2, a homeodomain-containing transcription factor that is important for ghrelin cell development in pancreas, activates the promoter activity. These transcription factors may be possible targets for the control of ghrelin gene expression.

journal_name

Int J Endocrinol

authors

Shiimura Y,Ohgusu H,Sato T,Kojima M

doi

10.1155/2015/580908

subject

Has Abstract

pub_date

2015-01-01 00:00:00

pages

580908

eissn

1687-8337

issn

1687-8345

journal_volume

2015

pub_type

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