JAK and STAT proteins are expressed and activated by IFN-gamma in rat pancreatic acinar cells.

Abstract:

:The development of acute pancreatitis (AP) is triggered by acinar events, but the subsequent extra-acinar events, particularly a distinct immune response, appear to determine its severity. Cytokines modulate this immune response and are derived not only from immunocytes but also from pancreatic acinar cells. We studied whether pancreatic acinar cells were also capable of responding to cytokines. The JAK/STAT-pathway represents the main effector for many cytokines. Therefore, expression and regulation of JAK and STAT proteins were investigated in rat pancreatic acinar cells. Western blotting showed expression of JAK1, JAK2, Tyk2, and STAT1, STAT2, STAT3, STAT5, STAT6. In addition, STAT1 was reversibly tyrosine-phosphorylated upon the procedure of acinar cell isolation. In contrast, STAT3-phosphorylation occurred spontaneously after pancreas removal and was not reversible within 8 h. STAT1 phosphorylation was also observed upon treatment with IFN-gamma but not upon EGF, TNF-alpha or IL-6, and inhibited by the JAK2-inhibitor AG-490. Immunohistochemistry revealed cytoplasmic expression of unphosphorylated STAT1 in untreated acinar cells and nuclear translocation of phosphorylated STAT1 following IFN-gamma-treatment. Interestingly, although CCK leads to the activation of multiple stress pathways in pancreatic acinar cells, we found no influence of CCK on phosphorylation of STAT1, STAT3, or STAT5 in the pancreas. In conclusion, our data provide further evidence that pancreatic acinar cells are able to interact with immune cells. Besides stimulating immune cells via cytokine secretion, acinar cells are in turn capable of responding to IFN-gamma via JAK2 and STAT1 which may have an impact on the development of AP.

journal_name

J Cell Physiol

authors

Gallmeier E,Schäfer C,Moubarak P,Tietz A,Plössl I,Huss R,Göke B,Wagner AC

doi

10.1002/jcp.20216

keywords:

subject

Has Abstract

pub_date

2005-04-01 00:00:00

pages

209-16

issue

1

eissn

0021-9541

issn

1097-4652

journal_volume

203

pub_type

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