What is the clinical evidence from this study?

Study design: Other. Population: Myocardial ischemia/reperfusion injury. Intervention: TNF-alpha knockout vs. Wild-type (WT) mice. Primary outcome: Infarct size.

What does this research mean for the field?

Tumor necrosis factor-alpha deficiency significantly reduces infarct size, decreases arrhythmia frequency, and improves cardiac function during myocardial ischemia/reperfusion injury. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To evaluate the role of tumor necrosis factor-α in mediating myocardial damage following acute ischemia and reperfusion.

September 26, 2026Journal of the American College of CardiologyOpen Access

Improved myocardial ischemia/reperfusion injury in mice lacking tumor necrosis factor-α

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Key result

TNF-alpha knockout reduces infarct size and arrhythmias while improving cardiac function during reperfusion in mice.

Why the study?

The precise role of tumor necrosis factor-alpha in myocardial ischemia/reperfusion injury remains unknown despite its suspected involvement in promoting leukocyte infiltration.

Population

TNF-alpha knockout and wild-type mice subjected to myocardial ischemia/reperfusion

Comparison

TNF-alpha knockout mice vs wild-type mice

Design

Experimental animal study with left coronary artery occlusion and reperfusion

Follow-up

120 minutes reperfusion

Authors

NMNaoya MaekawaHokkaido University HWHisayasu WadaKinan Hospital TKTsugiyasu KandaKanazawa Medical University

Discussion

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Implication

Animal experiment demonstrates reduced myocardial ischemia-reperfusion injury in mice lacking tumor necrosis factor-α, suggesting a key pathological role for this cytokine in cardiac tissue damage.

Key Points

To evaluate the role of tumor necrosis factor-α in mediating myocardial damage following acute ischemia and reperfusion.
Utilized genetically engineered mice lacking tumor necrosis factor-α alongside wild-type controls.
Subjected experimental animal models to temporary coronary occlusion followed by myocardial reperfusion to assess tissue injury.
Mice deficient in tumor necrosis factor-α exhibit significantly reduced myocardial tissue damage following ischemia and reperfusion.
Absence of tumor necrosis factor-α suppresses post-ischemic inflammatory injury and preserves cardiac tissue integrity.

PICO

Population

TNF-alpha knockout and wild-type mice subjected to 30 minutes of left coronary artery occlusion followed by 120 minutes of reperfusion.

Intervention / Comparator

TNF-alpha knockout vs Wild-type (WT) mice

Primary Outcome

Infarct size

Cite This Study

Maekawa et al. (2002) studied Myocardial ischemia/reperfusion injury. TNF-alpha knockout vs. Wild-type (WT) mice was evaluated on Infarct size. TNF-alpha knockout mice had significantly reduced infarct size, decreased arrhythmia frequency, and improved cardiac function during reperfusion compared with wild-type mice.

synapsesocial.com/papers/6ab7e1b4b0b7d0eae2e837b9 https://doi.org/10.1016/s0735-1097(02)01738-2

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Implication

Animal experiment demonstrates reduced myocardial ischemia-reperfusion injury in mice lacking tumor necrosis factor-α, suggesting a key pathological role for this cytokine in cardiac tissue damage.

Improved myocardial ischemia/reperfusion injury in mice lacking tumor necrosis factor-α

Discussion

Member takes

Implication

Key Points

PICO

Cite This Study

Improved myocardial ischemia/reperfusion injury in mice lacking tumor necrosis factor-α

Discussion

Member takes

Implication

Key Points

PICO

Cite This Study

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