Age-related differences in gene expression and pathway activation following heatstroke

Area of Science:

• Molecular Biology
• Genomics
• Aging Research

Background:

• Heatstroke poses significant health risks, with older adults often experiencing more severe outcomes.
• Understanding age-related molecular differences in heatstroke response is crucial for developing targeted interventions.

Purpose of the Study:

• To investigate and compare the whole-genome transcriptomic responses to heatstroke in young versus old patients.
• To identify age-specific molecular pathways and regulatory differences contributing to heatstroke vulnerability.

Main Methods:

• Whole-genome transcriptome analysis of young and old heatstroke patients, alongside controls.
• Comparison of gene expression profiles, pathway analysis (Sirtuin, mTOR, p53), and proteostasis markers between age groups.
• Assessment of heat stress and unfolded protein responses before and after cooling therapy.

Main Results:

• Older patients displayed 37% fewer differentially expressed genes, with a shift toward upregulation, unlike typical heat stress responses.
• Both groups showed increased heat shock protein expression, indicating comparable proteotoxic stress.
• Age-specific differences were observed in Sirtuin, mTOR, p53 signaling, proteostasis, metabolism, oxidative stress, and immune response pathways.

Conclusions:

• Older adults exhibit a diminished and atypical molecular response to heatstroke, characterized by reduced gene expression changes and impaired cellular repair.
• Age-related differences in key regulatory and cellular pathways contribute to increased vulnerability in older individuals during heat events.
• Findings underscore the necessity for age-specific strategies to mitigate heatstroke risks and improve outcomes in the aging population.