期刊
EXPERIMENTAL CELL RESEARCH
卷 308, 期 1, 页码 114-122出版社
ELSEVIER INC
DOI: 10.1016/j.yexcr.2005.03.041
关键词
BMPs; development; epithelial colony; laminin-1; pancreas; signaling
We previously reported that bone morphogenetic proteins (BMPs), members of the transforming growth factor superfamily, together with the basement membrane glycoprotein laminin-1 (Ln-1), promote proliferation of fetal pancreatic cells and formation of colonies containing peripheral insulin-positive cells. Here, we further investigate the cross-talk between BMP and Ln-1 signals. By RT-PCR, receptors for BMP (BMPR) (excepting BMPR-1B) and Ln-1 were expressed in the fetal pancreas between E13.5 and E17.5. Specific blocking antibodies to BMP-4 and -6 and selective BMP antagonists partially inhibited colony formation by fetal pancreas cells. Colony formation induced by BMP-6 and Ln-1 was completely abolished in a dose-dependent manner by blocking Ln-1 binding to its alpha 6 integrin and alpha-dystroglycan receptors or by blocking the Ln-1 signaling molecules, phosphatidyl-inositol-3-kinase (PI3K) and MAP kinase kinase-1. These results demonstrate a convergence of BMP and Ln-1 signaling through PI3K and MAP kinase pathways to induce proliferation and colony formation in E15.5 fetal mouse pancreatic cells. (c) 2005 Elsevier Inc. All rights reserved.
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