Pancreatic reg gene expression is inhibited during cellular differentiation.

Abstract:

BACKGROUND AND OBJECTIVE:Factors that control pancreatic regenerating (reg I) gene expression are unknown, but it is believed that its expression may correspond with cellular differentiation. The authors recently demonstrated that reg I is expressed in AR42J, a rat acinar cell line whose state of differentiation can be modulated by dexamethasone. They used this line to study reg I expression during cellular proliferation and differentiation. METHODS:After treatment of cells with 10 nmol/L dexamethasone, proliferation was assayed by thymidine incorporation; differentiation by expression of elastase I mRNA. Reg I mRNA levels were measured using a rat reg I cDNA probe, and reg I protein levels assayed by enzyme-linked immunosorbent assay of cellular lysates with a polyclonal antibody. The effect of gastrin, cholecystokinin and glucagon on reg I expression was also studied. RESULTS:When compared with controls, treatment with dexamethasone caused thymidine incorporation to decrease and elastase mRNA levels to increase. Reg I mRNA decreased from controls of 100 +/- 16% to 40 +/- 18% (p < 0.05), and reg I protein levels decreased as well. Gastrointestinal hormones had no significant effect on either elastase or reg I gene expression. CONCLUSIONS:Expression of reg I inversely correlates with the level of cellular differentiation, can be modulated via the glucocorticoid receptor, and is a potential marker of gastrointestinal epithelial differentiation. Despite its presence within a pancreatic acinar cell line, reg I gene expression is not modulated by gastrointestinal hormones.

journal_name

Ann Surg

journal_title

Annals of surgery

authors

Zenilman ME,Magnuson TH,Perfetti R,Chen J,Shuldiner AR

doi

10.1097/00000658-199703000-00013

subject

Has Abstract

pub_date

1997-03-01 00:00:00

pages

327-32

issue

3

eissn

0003-4932

issn

1528-1140

journal_volume

225

pub_type

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