Schmitz-Dumont; ter Horst, Justus Liebigs Annalen der Chemie, vol. 538, p. 273
作者:Schmitz-Dumont、ter Horst
DOI:——
日期:——
Schmitz-Dumont; ter Horst, Justus Liebigs Annalen der Chemie, vol. 538, p. 270
作者:Schmitz-Dumont、ter Horst
DOI:——
日期:——
Heat Shock Protein Accumulation Is Upregulated in a Long-Lived Mutant of Caenorhabditis elegans
作者:G. A. Walker、T. M. White、G. McColl、N. L. Jenkins、S. Babich、E. P. M. Candido、T. E. Johnson、G. J. Lithgow
DOI:10.1093/gerona/56.7.b281
日期:2001.7.1
We present evidence for elevated levels of heat shock protein 16 (HSP16) in an intrinsically thermotolerant, long-lived strain of Caenorhabditis elegans during and after heat stress. Mutation of the age-1 gene, encoding a phosphatidylinositol 3-kinase catalytic subunit, results in both extended life span (Age) and increased intrinsic thermotolerance (Itt) in adult hermaphrodites. We subjected age-synchronous cohorts of worms to lethal and nonlethal thermal stress and observed the accumulation of a small (16-18 kd) heat-shock-specific polypeptide detected by an antibody raised against C. elegans HSP16. Strains carrying the mutation hx546 consistently accumulated HSP16 to higher levels than a wild-type strain. Significantly, overaccumulation of HSP16 in the age-1(hx546) strain following heat was observed throughout the adult life span. A chimeric transgene containing the Escherichia coli beta -galactosidase gene fused to a C. elegans HSP16-41 transcriptional promoter was introduced into wild-type and age-1(hx546) backgrounds. Heat-inducible expression of the transgene was elevated in the age-1(hx546) strain compared with the wild-type strain under a wide variety of heat shock and recovery conditions. These observations are consistent with a model in which Age mutations exhibit thermotolerance and extended life span as a result of elevated levels of molecular chaperones.
Schmitz -Dumont; ter Horst, Justus Liebigs Annalen der Chemie, vol. 538, p. 270