Increased Expression of CCL2 in Insulin-producing Cells of Transgenic Mice Promotes Mobilization of Myeloid Cells from the Bone Marrow, Marked Insulitis, and Diabetes

Overview

Journal Diabetes

Specialty Endocrinology

Date 2008 Jul 18

PMID 18633103

Citations 65

Authors

Andrea P Martin

Sara Rankin

Simon Pitchford

Israel F Charo

Glaucia C Furtado

Sergio A Lira

Affiliations

Soon will be listed here.

Abstract

Objective: To define the mechanisms underlying the accumulation of monocytes/macrophages in the islets of Langerhans.

Research Design And Methods: We tested the hypothesis that macrophage accumulation into the islets is caused by overexpression of the chemokine CCL2. To test this hypothesis, we generated transgenic mice and evaluated the cellular composition of the islets by immunohistochemistry and flow cytometry. We determined serum levels of CCL2 by enzyme-linked immunosorbent assay, determined numbers of circulating monocytes, and tested whether CCL2 could mobilize monocytes from the bone marrow directly. We examined development of diabetes over time and tested whether CCL2 effects could be eliminated by deletion of its receptor, CCR2.

Results: Expression of CCL2 by beta-cells was associated with increased numbers of monocytes in circulation and accumulation of macrophages in the islets of transgenic mice. These changes were promoted by combined actions of CCL2 at the level of the bone marrow and the islets and were not seen in animals in which the CCL2 receptor (CCR2) was inactivated. Mice expressing higher levels of CCL2 in the islets developed diabetes spontaneously. The development of diabetes was correlated with the accumulation of large numbers of monocytes in the islets and did not depend on T- and B-cells. Diabetes could also be induced in normoglycemic mice expressing low levels of CCL2 by increasing the number of circulating myeloid cells.

Conclusions: These results indicate that CCL2 promotes monocyte recruitment by acting both locally and remotely and that expression of CCL2 by insulin-producing cells can lead to insulitis and islet destruction.

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