C-SH2 point mutation converts p85β regulatory subunit of phosphoinositide 3-kinase to an anti-aging gene

Area of Science:

• Molecular Biology
• Genetics
• Aging Research

Background:

• Insulin and IGF-1 signaling pathways are known to influence lifespan in mammals.
• The phosphoinositide-3 kinase (PI3K) enzyme plays a crucial role in cellular signaling cascades.
• Understanding the regulation of PI3K is key to exploring aging mechanisms.

Purpose of the Study:

• To investigate the effect of a specific PI3K regulatory subunit mutation on lifespan.
• To elucidate the molecular mechanisms by which this mutation impacts cellular signaling and aging.
• To identify potential novel anti-aging targets.

Main Methods:

• Generated transgenic mice with a point mutation in the C-SH2 domain of the p85β regulatory subunit of PI3K.
• Analyzed cellular responses to nerve growth factor (NGF) and platelet-derived growth factor (PDGF) in mutant cells.
• Assessed lifespan, oxidative stress resistance, serum insulin levels, and blood glucose in mutant and wild-type mice.

Main Results:

• A point mutation in the p85β subunit of PI3K resulted in a prolonged lifespan in mice.
• Mutant cells exhibited enhanced activation of the longevity protein FOXO by NGF.
• The mutation conferred strong resistance to oxidative stress and altered PI3K activity in response to NGF and PDGF, but not insulin.

Conclusions:

• A specific mutation in the p85β subunit of PI3K acts as an anti-aging gene.
• This mutation prolongs lifespan by modulating PI3K signaling downstream of NGF and PDGF.
• The findings suggest a novel mechanism for regulating aging through PI3K pathway alterations.