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Ischemia-reperfusion Model of Acute Kidney Injury and Post Injury Fibrosis in Mice
Published on: August 9, 2013
Pathogenesis of renal ischemia/reperfusion injury: lessons from knockout mice
Yeong-Hau H Lien1, Li-Wen Lai, Arnold L Silva
1Nephrology Section, Department of Medicine, University of Arizona Health Sciences Center, Tucson, AZ 85724, USA. lien@u.arizona.edu
Abstract:
Ischemia/reperfusion-induced acute renal failure is a common clinical problem associated with a high morbidity and mortality. Upon hypoxic injury, the depletion of ATP causes mitochondrial dysfunction, and accumulation of intracellular sodium, calcium and reactive oxygen species. Subsequently, multiple enzyme systems including proteases, nitric oxide synthases, phospholipases and endonuclease are activated and responsible for cytoskeleton disruption, membrane damage, and DNA degradation, and eventually cell death. Ischemia/reperfusion injury also activates complement, cytokines, and chemokines, which are cytotoxic themselves, but also attract leukocytes into the ischemic area to cause further damage. The vascular endothelial cell injury and dysfunction prolong ischemia and induce vascular congestion, edema, and further infiltration of inflammatory cells. Many players in renal ischemia/reperfusion injury and their mechanisms have been investigated using genetically manipulated mouse models. In this review, we focus on the information gathered from these studies. Deficiency of the Na/Ca exchanger, inducible nitric oxide synthase, Caspase-1, A3 adenosine receptor, C3, C5, C6, Factor B, or midkine protects the kidney against I/R injury. Conversely, deficiency of the interleukin-1 receptor, osteopontin, C4, or recombination activation gene-1 is not protective, while the absence of adrenomedullin or endothelin receptor B delays the recovery of ischemia/reperfusion injury. The knowledge obtained from these studies provides new direction for designing potential therapeutic agents for treating ischemia/reperfusion injury.
Insights
Genetic manipulation in mice reveals key factors influencing kidney injury from ischemia/reperfusion. Understanding these mechanisms offers new therapeutic targets for acute renal failure.
Area of Science:
- Nephrology
- Molecular Biology
- Immunology
Background:
- Ischemia/reperfusion (I/R) injury is a major cause of acute renal failure, leading to significant morbidity and mortality.
- Hypoxic injury triggers ATP depletion, mitochondrial dysfunction, and oxidative stress, activating enzymes that cause cellular damage.
- Inflammatory responses, including complement activation and leukocyte infiltration, exacerbate renal damage.
Purpose of the Study:
- To review findings from genetically manipulated mouse models investigating renal ischemia/reperfusion injury.
- To identify specific genes and pathways that protect against or exacerbate I/R injury.
- To inform the development of novel therapeutic strategies for I/R-induced acute kidney injury.
Main Methods:
- Analysis of genetically modified mouse models with targeted gene deficiencies.
- Investigation of the functional consequences of specific gene knockouts on renal I/R injury.
- Review of existing literature on molecular and cellular mechanisms of I/R injury.
Main Results:
- Deficiency in Na/Ca exchanger, inducible nitric oxide synthase, Caspase-1, A3 adenosine receptor, complement components (C3, C5, C6), Factor B, or midkine confers protection against I/R injury.
- Absence of interleukin-1 receptor, osteopontin, C4, or recombination activation gene-1 did not show protective effects.
- Lack of adrenomedullin or endothelin receptor B was associated with delayed recovery from I/R injury.
Conclusions:
- Genetically defined pathways significantly modulate the severity of renal I/R injury.
- Targeting specific molecular players identified through genetic studies holds promise for therapeutic interventions.
- Further research into these protective and detrimental pathways can guide the development of treatments for acute kidney injury.
