SOX4 Allows Facultative β-Cell Proliferation Through Repression of Cdkn1a.

Abstract:

:The high-mobility group box transcription factor SOX4 is the most highly expressed SOX family protein in pancreatic islets, and mutations in Sox4 are associated with an increased risk of developing type 2 diabetes. We used an inducible β-cell knockout mouse model to test the hypothesis that Sox4 is essential for the maintenance of β-cell number during the development of type 2 diabetes. Knockout of Sox4 at 6 weeks of age resulted in time-dependent worsening of glucose tolerance, impairment of insulin secretion, and diabetes by 30 weeks of age. Immunostaining revealed a decrease in β-cell mass in knockout mice that was caused by a 39% reduction in β-cell proliferation. Gene expression studies revealed that induction of the cell cycle inhibitor Cdkn1a was responsible for the decreased proliferation in the knockout animals. Altogether, this study demonstrates that SOX4 is necessary for adult β-cell replication through direct regulation of the β-cell cycle.

journal_name

Diabetes

journal_title

Diabetes

authors

Xu EE,Sasaki S,Speckmann T,Nian C,Lynn FC

doi

10.2337/db16-1074

subject

Has Abstract

pub_date

2017-08-01 00:00:00

pages

2213-2219

issue

8

eissn

0012-1797

issn

1939-327X

pii

db16-1074

journal_volume

66

pub_type

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