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Updated: Feb 15, 2026
Induction and Assessment of Ischemia-reperfusion Injury in Langendorff-perfused Rat Hearts
Published on: July 27, 2015
Transient Receptor Potential Canonical Channel Blockers Improve Ventricular Contractile Functions After
Akiko Kojima, Yutaka Fukushima, Yuki Ito
1Physiology, Shiga University of Medical Science, Otsu, Japan.
Insights
Transient receptor potential canonical (TRPC) channels contribute to heart dysfunction after ischemia. Blocking these channels during reperfusion improved cardiac function, suggesting TRPC channels as a therapeutic target for myocardial ischemia/reperfusion injury.
Area of Science:
- Cardiovascular Biology
- Ion Channel Physiology
- Myocardial Ischemia Research
Background:
- Ischemia-reperfusion injury causes intracellular calcium overload and cardiac dysfunction.
- The precise mechanisms of calcium overload, potentially involving store-operated calcium entry, remain unclear.
- Transient receptor potential canonical (TRPC) channels are implicated in regulating calcium entry.
Purpose of the Study:
- To investigate the role of TRPC channels in contractile dysfunction following myocardial ischemia-reperfusion.
- To determine if TRPC channel activity contributes to cardiac dysfunction in a mouse model.
Main Methods:
- Confirmed functional expression of TRPC channels in mouse ventricular myocytes via immunocytochemistry, Western blotting, and patch-clamp.
- Utilized a Langendorff-perfused mouse heart model subjected to global ischemia and reperfusion.
- Assessed left ventricular function (pressure, derivatives) and the effects of TRPC channel blockers (2-aminoethoxydiphenyl borate, La).
Main Results:
- Left ventricular function significantly deteriorated during reperfusion in control hearts.
- Administration of TRPC channel blockers during early reperfusion markedly improved left ventricular function.
- TRPC channel activity is directly linked to the development of contractile dysfunction post-ischemia.
Conclusions:
- TRPC channels play a critical role in mediating cardiac contractile dysfunction during myocardial reperfusion.
- TRPC channels represent a promising therapeutic target for mitigating ischemia/reperfusion injury.
- Targeting TRPC channels could offer a novel strategy for protecting the heart from ischemic damage.
Abstract:
Reperfusion of ischemic myocardium is accompanied by intracellular Ca overload, leading to cardiac dysfunction. However, the mechanisms underlying intracellular Ca overload have yet to be fully elucidated. The mechanism may involve the activation of store-operated Ca entry, which is primarily mediated through the transient receptor potential canonical (TRPC) channels. This study was undertaken to examine the possible involvement of TRPC channels in the development of contractile dysfunction associated with reperfusion of ischemic myocardium using a mouse heart model. The functional expression of TRPC channels was confirmed in mouse ventricular myocytes using immunocytochemistry, Western blotting, and patch-clamp experiments. The left ventricular functions were assessed by measuring left ventricular end-diastolic pressure, left ventricular developed pressure, and its first derivatives in a Langendorff-perfused mouse heart subjected to 30 minutes of normothermic (37°C) global ischemia followed by 60 minutes of reperfusion. Under control conditions, left ventricular functions were deteriorated during reperfusion, which was significantly ameliorated by administration of the TRPC channel blockers 2-aminoethoxydiphenyl borate and La during initial 5 minutes of reperfusion. Our findings suggest that TRPC channels are involved in mediating contractile dysfunction during reperfusion of ischemic myocardium and detect TRPC channels as a potential therapeutic target for preventing myocardial ischemia/reperfusion injury.
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