Abstract:
:Somatostatin (SST) is a regulatory peptide and acts as an endogenous inhibitory regulator of the secretory and proliferative responses of target cells. SST's actions are mediated by a family of seven transmembrane domain G protein-coupled receptors that comprise five distinct subtypes (SSTR1-5). SSTR5 is one of the major SSTRs in the islets of Langerhans. Homeodomain-containing transcription factor pancreatic and duodenal homeobox-1 (PDX-1) is essential for pancreatic development, β cell differentiation, maintenance of normal β cell functions in adults and tumorigenesis. Recent studies show that SSTR5 acts as a negative regulator for PDX-1 expression and that SSTR5 mediates somatostatin's inhibitory effect on cell proliferation and insulin expression/excretion through down-regulating PDX-1 expression. SSTR5 exerts its inhibitory effect on PDX-1 expression at both the transcriptional level by down-regulating PDX-1 mRNA and the post-translational level by enhancing PDX-1 ubiquitination. Identification of PDX-1 as a transcriptional target for SSTR5 may help in guiding the choice of therapeutic cancer treatments.
journal_name
Front Physioljournal_title
Frontiers in physiologyauthors
Zhou G,Sinnett-Smith J,Liu SH,Yu J,Wu J,Sanchez R,Pandol SJ,Abrol R,Nemunaitis J,Rozengurt E,Brunicardi FCdoi
10.3389/fphys.2014.00226subject
Has Abstractpub_date
2014-06-25 00:00:00pages
226issn
1664-042Xjournal_volume
5pub_type
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pub_type: 杂志文章,评审
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