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Interactions of GSK-3β with mitochondrial permeability transition pore modulators during preconditioning:
Jiang Zhu1, Mario J Rebecchi, Peter S A Glass
1Department of Anesthesiology, Stony Brook University School of Medicine, HSC L4 060, NY 11794, USA.
Anesthetic preconditioning (APC) and ischemic preconditioning (IPC) lose effectiveness with aging. This study reveals age-related failures in molecular pathways that protect the heart during stress, impacting mitochondrial function.
Area of Science:
- Cardiology
- Gerontology
- Molecular Biology
Background:
- Anesthetic preconditioning (APC) and ischemic preconditioning (IPC) are protective mechanisms against cardiac stress.
- These protective effects are known to diminish with normal aging.
Purpose of the Study:
- To investigate age-related differences in phosphoglycogen synthase kinase-3beta (pGSK-3β) signaling.
- To examine the role of pGSK-3β and mitochondrial permeability transition pore (mPTP) modulators in the loss of APC and IPC with aging.
Main Methods:
- Studied young and old rats subjected to APC or IPC.
- Analyzed pGSK-3β levels in cytosol and mitochondria.
- Investigated interactions between pGSK-3β, adenine nucleotide translocase (ANT), and cyclophilin-D (CyD).
- Assessed mPTP opening time in cardiomyocytes under oxidative stress.
Main Results:
- APC and IPC increased pGSK-3β in young rats but not in old rats.
- Young rats showed decreased ANT-CyD interaction after APC/IPC, while old rats did not.
- APC/IPC prolonged mPTP opening time in young cardiomyocytes, but not in elderly ones.
Conclusions:
- The protective effects of APC and IPC are attenuated in the aging heart.
- This attenuation is linked to the failure to reduce ANT-CyD interactions and diminished pGSK-3β responsiveness.
- Dysregulation of mPTP modulators contributes to the loss of preconditioning benefits in aged hearts.
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