Exercise Training Restores IGFIR Survival Signaling in D-galactose Induced-aging Rats to Suppress Cardiac Apoptosis

Overview

Journal J Adv Res

Specialties General Medicine
Science

Date 2020 Dec 28

PMID 33364043

Citations 10

Authors

Ing-Shiow Lay

Wei-Wen Kuo

Marthandam Asokan Shibu

Tsung-Jung Ho

Shiu-Min Cheng

Cecilia Hsuan Day

Bo Ban

Shulin Wang

Qiaowen Li

Chih-Yang Huang

Affiliations

Soon will be listed here.

Abstract

Introduction: Insulin-like growth factor-I receptor (IGF1R) mediated survival signaling is a crucial mechanism for cellular endurance and a potential indicator of recuperation in deteriorating hearts.

Objective: This study evaluates the impact of long-term exercise training in enhancing cardiac survival mechanism in D-galactose-induced toxicity associated aging rats.

Methods: Forty-eight male SD-rats were segregated into 4 groups (n=9) and were named as control, exercise training groups, aging group and aging group with exercise training. Aging was induced by intraperitoneal (IP) D-galactose (150 mL/kg) injection for 8 weeks and for exercise training, the rats were left to swim in warm water for 60 min every day and 5 times/week. Western blotting of proteins from the left ventricles was performed to identify the modulations in the survival signaling. Tissue sections were analyzed to determine the extent of fibrosis and apoptosis.

Results: Western-blot analysis performed on the excised left ventricles (LV) showed that proteins of the cardiac survival pathway including IGF1R and Akt and the pro-survival Bcl-2 showed significant decrease in the aging group, whereas the levels were restored in the aging rats subjected to exercise training. In addition, aging groups showed increased interstitial space and collagen accumulation. Further, TUNEL assay showed higher number of apoptotic cells in the LV of aging group, which was correlated with increase in the proteins involved in FAS-FADD-dependent apoptosis. However, these aging associated effects were ameliorated upon exercise training in the D-galactose-induced aging rats that showed elevated IGF1R/Akt signaling.

Conclusion: The results suggest that IGFIR survival signaling cascadeis elevated in following long-term exercise training and thereby provide cardio-protective benefits in D-galactose induced aging rats.

Citing Articles

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Akbar A, Cui Z, Hsu C, Li Y, Rahman F, Xia C Front Cardiovasc Med. 2023; 10:1138705.

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D-galactose-induced cardiac ageing: A review of model establishment and potential interventions.

Wang S, Zhang X, Ke Z, Wen X, Li W, Liu W J Cell Mol Med. 2022; 26(21):5335-5359.

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