期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 107, 期 3, 页码 1142-1147出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0910205107
关键词
Alk8/Acvr1/Alk2; beta-cell; diabetes; endoderm; pancreas
资金
- Swedish Research Council
- Wenner-Gren Fellows program
- National Institutes of Health [DK075032]
- Packard Foundation
Bmp signaling has been shown to regulate early aspects of pancreas development, but its role in endocrine, and especially beta-cell, differentiation remains unclear. Taking advantage of the ability in zebrafish embryos to cell-autonomously modulate Bmp signaling in single cells, we examined how Bmp signaling regulates the ability of individual endodermal cells to differentiate into beta-cells. We find that specific temporal windows of Bmp signaling prevent beta-cell differentiation. Thus, future dorsal bud-derived beta-cells are sensitive to Bmp signaling specifically during gastrulation and early somitogenesis stages. In contrast, ventral pancreatic cells, which require an early Bmp signal to form, do not produce beta-cells when exposed to Bmp signaling at 50 hpf, a stage when the ventral bud-derived extrapancreatic duct is the main source of new endocrine cells. Importantly, inhibiting Bmp signaling within endodermal cells via genetic means increased the number of beta-cells, at early and late stages. Moreover, inhibition of Bmp signaling in the late stage embryo using dorsomorphin, a chemical inhibitor of Bmp receptors, significantly increased beta-cell neogenesis near the extrapancreatic duct, demonstrating the feasibility of pharmacological approaches to increase beta-cell numbers. Our in vivo single-cell analyses show that whereas Bmp signaling is necessary initially for formation of the ventral pancreas, differentiating endodermal cells need to be protected from exposure to Bmps during specific stages to permit beta-cell differentiation. These results provide important unique insight into the intercellular signaling environment necessary for in vivo and in vitro generation of beta-cells.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据