Abstract
Remote ischemic conditioning (RIC) can be effectively applied for cardio-protection. Here, to clarify whether RIC exerts myocardial protection via aldehyde dehydrogenase 2 (ALDH2), we established a myocardial ischemia/reperfusion (I/R) model in C57BL/6 and ALDH2 knockout (ALDH2-KO) mice and treated them with RIC. Echocardiography and single-cell contraction experiments showed that RIC significantly improved myocardial function and alleviated I/R injury in C57BL/6 mice but did not exhibit its cardioprotective effects in ALDH2-KO mice. TUNEL, Evan’s blue/triphenyl tetrazolium chloride, and reactive oxygen species (ROS) assays showed that RIC’s effect on reducing myocardial cell apoptosis, myocardial infarction area, and ROS levels was insignificant in ALDH2-KO mice. Our results showed that RIC could increase ALDH2 protein levels, activate sirtuin 3 (SIRT3)/hypoxia-inducible factor 1-alpha (HIF1α), inhibit autophagy, and exert myocardial protection. This study revealed that RIC could exert myocardial protection via the ALDH2/SIRT3/HIF1α signaling pathway by reducing 4-HNE secretion.
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Data Availability
The data that support the findings of this study are available from the corresponding author upon reasonable request.
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Abbreviations
- RIC:
-
Remote ischemic conditioning
- ALDH2:
-
Aldehyde dehydrogenase 2
- I/R:
-
Ischemia/reperfusion
- ROS:
-
Reactive oxygen species
- SIRT3:
-
Sirtuin 3
- HIF1α:
-
Hypoxia-inducible factor 1-alpha
- 4-HNE:
-
4-hydroxynonenal
- ALDH2-KO:
-
ALDH2 knockout
- TTC:
-
1% 2,3,5-triphenyl tetrazolium chloride
- PS:
-
Peak shortening
- -dL/dt:
-
Maximal velocity of shortening
- DHE:
-
Dihydroethidium
- LVFS:
-
Left ventricular fractional shortening
- LVEF:
-
Left ventricular ejection fraction
- AAR:
-
Area at risk
- WT:
-
Wild-type
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Funding
This research was funded by the Jiangxi Provincial Natural Science Foundation Project (20071BBG70067, 20181074), and the National Natural Science Foundation of China (81160019 and 81360031).
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Rifeng Gao, Chunyu Lv, and Yanan Qu designed the research and wrote the paper. Rifeng Gao, Heng Yang, Xiaolei Sun, and Chuangze Hao performed the experiments. Rifeng Gao, Xiaosheng Hu, Yiqing Yang, and Yanhua Tang contributed new reagents/analytic tools and provide critical suggestions. Rifeng Gao, Chunyu Lv, and Yanan Qu analyzed the data. Xiaosheng Hu, Yiqing Yang, and Yanhua Tang edited the paper.
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All animal experiments were approved by the Animal Care Ethics Committee of Fudan University and performed in accordance with the National Institutes of Health Guide for the Care and Use of Laboratory Animals. The mice were kept under a 12:12-h light/dark cycle at a consistent temperature and humidity and were also given ad libitum access to food and water. Additional dose of analgesics was given if the animals appeared to be experiencing pain (based on criteria such as immobility and failure to eat). At the indicated time points, mice were euthanized by CO2/cervical dislocation, and tissues were subsequently harvested for analyses.
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Supplementary Figure 1
RIC treatment preserves cardiac function after I/R. Representative images of echocardiography tracing in I/R mice treated with RIC in each group after 24 h reperfusion (a). Heart rate (BPM, n>6, b). Left ventricular ejection fraction (LVEF, n>6, c). Left ventricular fractional shortening (LVFS, n>6, D). Peak shortening (% cell lengthening, n>6, e). Maximal shortening velocity (-dl/dt, n>6, f). Data are depicted as the mean ± SEM. Statistical significance was determined by two-way ANOVA with a post-hoc Holm-Sidak test, ns, not significant; *P<0.05; ***P<0.001; compared with the control group. (PNG 1135 kb)
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Gao, R., Lv, C., Qu, Y. et al. Remote Ischemic Conditioning Mediates Cardio-protection After Myocardial Ischemia/Reperfusion Injury by Reducing 4-HNE Levels and Regulating Autophagy via the ALDH2/SIRT3/HIF1α Signaling Pathway. J. of Cardiovasc. Trans. Res. 17, 169–182 (2024). https://doi.org/10.1007/s12265-023-10355-z
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DOI: https://doi.org/10.1007/s12265-023-10355-z