Negative regulation of Caenorhabditis elegans epidermal damage responses by death-associated protein kinase.

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Tong, Amy | Lynn, Grace | Ngo, Vy | Wong, Daniel | Moseley, Sarah L | Ewbank, Jonathan J | Goncharov, Alexandr | Wu, Yi-Chun | Pujol, Nathalie | Chisholm, Andrew D

Edité par CCSD ; National Academy of Sciences -

International audience. Wounding of epidermal layers triggers multiple coordinated responses to damage. We show here that the Caenorhabditis elegans ortholog of the tumor suppressor death-associated protein kinase, dapk-1, acts as a previously undescribed negative regulator of barrier repair and innate immune responses to wounding. Loss of DAPK-1 function results in constitutive formation of scar-like structures in the cuticle, and up-regulation of innate immune responses to damage. Overexpression of DAPK-1 represses innate immune responses to needle wounding. Up-regulation of innate immune responses in dapk-1 requires the TIR-1/p38 signal transduction pathway; loss of function in this pathway synergizes with dapk-1 to drastically reduce adult lifespan. Our results reveal a previously undescribed function for the DAPK tumor suppressor family in regulation of epithelial damage responses.

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