Identification of a mechanochemical checkpoint and negative feedback loop regulating branching morphogenesis.
Identification of a mechanochemical checkpoint and negative feedback loop regulating branching morphogenesis.
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DOI:
10.1016/j.ydbio.2009.09.037
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发表时间:
2009-12-15
影响因子:
2.7
通讯作者:
Larsen, Melinda
中科院分区:
文献类型:
--
作者:
Daley, William P.;Gulfo, Kathryn M.;Sequeira, Sharon J.;Larsen, Melinda
关键词:
Cleft formation is the initial step in submandibular salivary gland (SMG) branching morphogenesis, and may result from localized actomyosin-mediated cellular contraction. Since ROCK regulates cytoskeletal contraction, we investigated the effects of ROCK inhibition on mouse SMG ex vivo organ cultures. Pharmacological inhibitors of ROCK, isoform-specific ROCK I but not ROCK II siRNAs, as well as inhibitors of myosin II activity stalled clefts at initiation. This finding implies the existence of a mechanochemical checkpoint regulating the transition of initiated clefts into progression-competent clefts. Downstream of the checkpoint, clefts are rendered competent through localized assembly of fibronectin promoted by ROCK I/myosin II. Cleft progression is primarily mediated by ROCK I/myosin II-stimulated cell proliferation with a contribution from cellular contraction. Furthermore, we demonstrate that FN assembly itself promotes epithelial proliferation and cleft progression in a ROCK-dependent manner. ROCK also stimulates a proliferation-independent negative feedback loop to prevent further cleft initiations. These results reveal that cleft initiation and progression are two physically and biochemically distinct processes.
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