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Homeodomain-Interacting Protein Kinase (HPK-1) regulates stress responses and ageing in C. elegans


Proteins of the Homeodomain-Interacting Protein Kinase (HIPK) family regulate an array of processes in mammalian systems, such as the DNA damage response, cellular proliferation and apoptosis. The nematode Caenorhabditis elegans has a single HIPK homologue called HPK-1. Previous studies have implicated HPK-1 in longevity control and suggested that this protein may be regulated in a stress-dependent manner. Here we set out to expand these observations by investigating the role of HPK-1 in longevity and in the response to heat and oxidative stress. We find that levels of HPK-1 are regulated by heat stress, and that HPK-1 contributes to survival following heat or oxidative stress. Additionally, we show that HPK-1 is required for normal longevity, with loss of HPK-1 function leading to a faster decline of physiological processes that reflect premature ageing. Through microarray analysis, we have found that HPK-1-regulated genes include those encoding proteins that serve important functions in stress responses such as Phase I and Phase II detoxification enzymes. Consistent with a role in longevity assurance, HPK-1 also regulates the expression of age-regulated genes. Lastly, we show that HPK-1 functions in the same pathway as DAF-16 to regulate longevity and reveal a new role for HPK-1 in development.

Type Journal
ISBN 2045-2322 (Electronic) 2045-2322 (Linking)
Authors Berber, S.; Wood, M.; Llamosas, E.; Thaivalappil, P.; Lee, K.; Liao, B. M.; Chew, Y. L.; Rhodes, A.; Yucel, D.; Crossley, M.; Nicholas, H. R.;
Publisher Name Scientific Reports
Published Date 2016-01-01
Published Volume 6
Published Pages 19582
Status Published in-print
URL link to publisher's version
OpenAccess link to author's accepted manuscript version