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Published on: April 19, 2011
Age-associated differences in gene expression in response to delayed anesthetic preconditioning.
1Institute of Toxicology, Nanjing Medical University, China. cyzhong@njmu.edu.cn
Age (Dordrecht, Netherlands)
|October 20, 2011
Summary
Anesthetic preconditioning (APC) loses protective benefits in aged hearts. Aging significantly reduces the genomic response to delayed APC, impacting gene expression and impairing myocardial protection.
Area of Science:
- Cardiology
- Molecular Biology
- Gerontology
Background:
- Anesthetic preconditioning (APC) offers cardioprotection, but its efficacy diminishes with age.
- The aged myocardium exhibits reduced responsiveness to protective interventions like APC.
Purpose of the Study:
- To investigate the impact of aging on gene expression patterns during delayed anesthetic preconditioning (APC).
- To determine if age-associated changes in gene expression underlie the loss of APC benefits in the elderly heart.
Main Methods:
- Gene expression profiling using whole-genome arrays (Affymetrix Rat Genome 230 2.0) in young (4-month) and old (24-month) Fischer 344 rats.
- Experimental groups included control, ischemia/reperfusion (I/R), and delayed APC at 6, 12, and 24 hours.
- Microarray findings were validated using quantitative real-time reverse transcription-polymerase chain reaction (qRT-PCR).
Main Results:
- Aging markedly reduced the number of significantly altered genes in response to delayed APC compared to young rats.
- In young rats, delayed APC modulated genes involved in cell defense, structure, protein synthesis, inflammation, and signaling.
- Delayed APC reduced infarct size and improved cardiac function in young hearts, but these benefits were absent in old hearts.
Conclusions:
- Delayed anesthetic preconditioning differentially affects cardiomyocyte gene expression in an age-dependent manner.
- The diminished genomic response to APC in aged hearts likely contributes to the loss of its protective effects.
- Understanding these age-related molecular changes is crucial for developing effective cardioprotective strategies for the elderly.
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