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Updated: Apr 25, 2026
A Murine Model of Myocardial Ischemia-reperfusion Injury through Ligation of the Left Anterior Descending Artery
Published on: April 10, 2014
miR-21 in ischemia/reperfusion injury: a double-edged sword?
Xialian Xu1, Alison J Kriegel2, Xiaoyan Jiao1
1Division of Nephrology, Fudan University Zhongshan Hospital, Shanghai, Peoples Republic of China;
Abstract:
MicroRNAs (miRNAs or miRs) are endogenous, small RNA molecules that suppress expression of targeted mRNA. miR-21, one of the most extensively studied miRNAs, is importantly involved in divergent pathophysiological processes relating to ischemia/reperfusion (I/R) injury, such as inflammation and angiogenesis. The role of miR-21 in renal I/R is complex, with both protective and pathological pathways being regulated by miR-21. Preconditioning-induced upregulation of miR-21 contributes to the protection against subsequent renal I/R injury through the targeting of genes such as the proapoptotic gene programmed cell death 4 and interactions between miR-21 and hypoxia-inducible factor. Conversely, long-term elevation of miR-21 may be detrimental to the organ by promoting the development of renal interstitial fibrosis following I/R injury. miR-21 is importantly involved in several pathophysiological processes related to I/R injury including inflammation and angiogenesis as well as the biology of stem cells that could be used to treat I/R injury; however, the effect of miR-21 on these processes in renal I/R injury remains to be studied.
Insights
MicroRNA-21 (miR-21) plays a dual role in kidney ischemia/reperfusion (I/R) injury, offering protection acutely but potentially causing fibrosis long-term. Its complex effects on inflammation and angiogenesis in renal I/R require further study.
Area of Science:
- Molecular Biology
- Renal Pathophysiology
- Biochemistry
Background:
- MicroRNAs (miRNAs) are small non-coding RNAs regulating gene expression.
- miR-21 is implicated in various pathophysiological processes, including inflammation and angiogenesis.
- The specific role of miR-21 in renal ischemia/reperfusion (I/R) injury is complex and multifaceted.
Purpose of the Study:
- To elucidate the intricate role of miR-21 in the context of renal I/R injury.
- To explore the dual protective and pathological functions of miR-21 in the kidney.
- To investigate miR-21's involvement in inflammation, angiogenesis, and stem cell biology relevant to renal I/R.
Main Methods:
- Literature review and synthesis of existing research on miR-21 and renal I/R.
- Analysis of miR-21's regulatory targets, including programmed cell death 4 (PDCD4) and hypoxia-inducible factor (HIF).
- Examination of miR-21's impact on cellular processes like apoptosis, inflammation, and fibrosis.
Main Results:
- Preconditioning-induced upregulation of miR-21 confers protection against renal I/R injury.
- miR-21 targets proapoptotic genes like PDCD4 and interacts with HIF, mediating protective effects.
- Sustained elevation of miR-21 may promote renal interstitial fibrosis post-I/R, indicating a detrimental long-term role.
Conclusions:
- miR-21 exhibits a complex, context-dependent role in renal I/R injury, acting as both a protective and pathological factor.
- Understanding miR-21's dual function is crucial for developing therapeutic strategies for renal I/R.
- Further research is needed to fully delineate miR-21's effects on stem cell biology and its therapeutic potential in renal I/R.
