NDLI: Mitogen-activated protein kinase kinase kinase 1 (MAP3K1) integrates developmental signals for eyelid closure

Content Provider	PubMed Central
Author	Geh, Esmond Meng, Qinghang Mongan, Maureen Wang, Jingcai Takatori, Atsushi Zheng, Yi Puga, Alvaro Lang, Richard A. Xia, Ying
Abstract	Developmental eyelid closure is an evolutionarily conserved morphogenetic event requiring proliferation, differentiation, cytoskeleton reorganization, and migration of epithelial cells at the tip of the developing eyelid. Many signaling events take place during eyelid closure, but how the signals converge to regulate the morphogenetic process remains an open and intriguing question. Here we show that mitogen-activated protein kinase kinase kinase 1 (MAP3K1) highly expressed in the developing eyelid epithelium, forms with c-Jun, a regulatory axis that orchestrates morphogenesis by integrating two different networks of eyelid closure signals. A TGF-α/EGFR-RhoA module initiates one of these networks by inducing c-Jun expression which, in a phosphorylation-independent manner, binds to the Map3k1 promoter and causes an increase in MAP3K1 expression. RhoA knockout in the ocular surface epithelium disturbs this network by decreasing MAP3K1 expression, and causes delayed eyelid closure in Map3k1 hemizygotes. The second network is initiated by the enzymatic activity of MAP3K1, which phosphorylates and activates a JNK-c-Jun module, leading to AP-1 transactivation and induction of its downstream genes, such as Pai-1. MAP3K1 inactivation reduces AP-1 activity and PAI-1 expression both in cells and developing eyelids. MAP3K1 is therefore the nexus of an intracrine regulatory loop connecting the TGF-α/EGFR/RhoA-c-Jun and JNK-c-Jun-AP-1 pathways in developmental eyelid closure.
Related Links	http://dx.doi.org/10.1073/pnas.1102297108
Starting Page	17349
File Format	PDF
ISSN	10916490
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	42
Volume Number	108
Language	English
Publisher	National Academy of Sciences
Publisher Date	2011-10-18
Access Restriction	Open
Rights Holder	National Academy of Sciences
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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