Related Experiment Video

Updated: Jun 16, 2026

An Effective Mouse Model of Unilateral Renal Ischemia-Reperfusion Injury
05:53

An Effective Mouse Model of Unilateral Renal Ischemia-Reperfusion Injury

Published on: July 15, 2021

Toll-like receptors 2 and 4 in renal ischemia/reperfusion injury

Krisztina Rusai1, Daniel Sollinger, Marcus Baumann

  • 1Department of Nephrology, Technical University Munich, Klinikum rechts der Isar, Ismaninger Str. 22, Munich, Germany.

Pediatric Nephrology (Berlin, Germany)
|February 5, 2010
PubMed

Insights

Deleting both Toll-like receptors (TLR2 and TLR4) did not offer greater kidney protection against ischemia/reperfusion injury than deleting either receptor alone. Combined TLR2/4 deletion showed similar outcomes to single TLR2 or TLR4 gene deletion.

Area of Science:

  • Immunology
  • Renal Physiology
  • Cell Biology

Background:

  • Toll-like receptors (TLRs) are key components of innate immunity, crucial for responding to tissue injury.
  • TLR2 and TLR4 are present on kidney cells and their levels increase after ischemia/reperfusion (I/R) injury.
  • Individual deletion of TLR2 or TLR4 protects kidneys from I/R injury.

Purpose of the Study:

  • To investigate if combined deletion of TLR2 and TLR4 provides enhanced protection against renal I/R injury compared to single deletions.
  • To compare the effects of TLR2, TLR4, and combined TLR2/4 gene deletion on kidney histology, function, and cellular damage markers.

Main Methods:

  • Induction of renal I/R injury in mice genetically modified to lack TLR2, TLR4, or both TLR2 and TLR4.
  • Assessment of kidney injury through histological evaluation and measurement of renal function parameters.
  • Analysis of tubular cell apoptosis and nuclear factor-kappaB (NF-kappaB) translocation.
  • In vitro studies using isolated proximal tubular epithelial cells to measure cytokine production (TNF-alpha, IL-8) under hypoxic conditions.

Main Results:

  • No significant difference in protection against renal I/R injury was observed between mice lacking both TLR2 and TLR4 (TLR2/4((-/-))) and those lacking only TLR2 (TLR2((-/-))) or only TLR4 (TLR4((-/-))).
  • Histological and functional assessments showed comparable levels of kidney protection across all gene-targeted groups.
  • Apoptotic cell counts and NF-kappaB activation were similar in TLR2((-/-)), TLR4((-/-))), and TLR2/4((-/-))) mice.
  • In vitro experiments revealed no additional benefit of combined TLR2/4 deletion on TNF-alpha and IL-8 production compared to single deletions.

Conclusions:

  • Combined genetic deletion of TLR2 and TLR4 does not confer superior protection to the kidney following I/R injury compared to the deletion of either TLR2 or TLR4 alone.
  • The study suggests that targeting both TLR2 and TLR4 simultaneously may not offer additive benefits for mitigating renal I/R injury.
  • These findings contribute to understanding the specific roles of TLR2 and TLR4 in renal injury and immunity.

More Related Videos

Renal Ischaemia Reperfusion Injury: A Mouse Model of Injury and Regeneration12:27

Renal Ischaemia Reperfusion Injury: A Mouse Model of Injury and Regeneration

Published on: June 7, 2014

Related Concept Videos

Acute Kidney Injury II: Pathophysiology01:29

Acute Kidney Injury II: Pathophysiology

Acute kidney injury (AKI) causes are categorized into three primary categories based on the location of the injury: prerenal, intrarenal (or intrinsic), and postrenal causes. This classification guides clinical management and illustrates how different pathways can impair kidney function.Etiology and Pathophysiology of Acute Kidney Injury1. Prerenal causesEtiology: Prerenal Acute Kidney Injury, the most common type, occurs when reduced blood flow to the kidneys decreases filtration capacity...
Cellular Injury IV: Necrosis01:16

Cellular Injury IV: Necrosis

Necrosis is a form of irreversible cell death caused by severe injury such as ischemia, toxins, or trauma. Unlike programmed cell death, it is an uncontrolled, pathological process that typically provokes inflammation in surrounding tissues.Pathophysiologic ChangesNecrosis begins when cells sustain critical damage, leading to swelling of organelles, particularly mitochondria, and rapid ATP depletion. As energy levels decline, membrane ion pumps fail, leading to calcium influx and eventually,...
Acute Kidney Injury I: Introduction01:22

Acute Kidney Injury I: Introduction

Introduction:Acute Kidney Injury (AKI) describes a swift decrease in kidney function occurring over hours to days, characterized by the kidneys' failure to remove waste products from the bloodstream. This leads to dangerous complications like metabolic acidosis, fluid overload, and electrolyte imbalances, such as hyperkalemia, which can cause life-threatening arrhythmias. AKI is common in both hospital and outpatient settings, often triggered by dehydration, sepsis, or exposure to nephrotoxic...
Transducer Mechanism: Enzyme-Linked Receptors01:27

Transducer Mechanism: Enzyme-Linked Receptors

Enzyme-linked receptors are cell-surface receptors acting as an enzyme or associating with an enzyme intracellularly. They make excellent drug targets. Drugs can bind to the extracellular ligand-binding domain or directly affect their enzymatic domain and alter their activity.
Major types that are helpful drug targets include: