Abstract
Remote ischemic preconditioning (RIPC) treatment strategy is a breakthrough in the field of cardiovascular pharmacology as it has the potential to attenuate myocardial ischemia-reperfusion injury. However, the underlying intracellular pathways have not been widely explored. The present study intends to explore the possible role of TRPV1 channels in mediating remote hind limb preconditioning-induced cardioprotection. Remote hind limb preconditioning stimulus (4 cycles in succession) was delivered by tying the blood pressure cuff at the inguinal level of the rat. The Langendorff system was used to perfuse the isolated heart and afterward was subjected to 30 min of global ischemia and 120 min of reperfusion. Sustained ischemia and, thereafter, reperfusion led to cardiac injury that was assessed in terms of infarct size, lactate dehydrogenase (LDH) release, creatine kinase (CK) release, left ventricular end diastolic pressure (LVEDP), left ventricular developed pressure (LVDP), +dp/dtmax, −dp/dtmin, heart rate, rate pressure product, and coronary flow rate. The pharmacological modulators employed included capsaicin as TRPV1 agonist and capsazepine as TRPV1 antagonist. Remote hind limb preconditioning stimulus and capsaicin preconditioning (5 and 10 mg/kg) led to significant reduction in infarct size, LVEDP, LDH release, CK release, and significant improvement in LVDP, +dp/dtmax, −dp/dtmin, heart rate, rate pressure product, and coronary flow rate. However, remote hind limb preconditioning-induced cardioprotective effects were considerably abolished in the presence of capsazepine (2.5 and 5 mg/kg). This indicates that remote hind limb preconditioning stimulus possibly activates TRPV1 channels to produce cardioprotective effects.
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Acknowledgment
The authors are thankful to the Department of Science and Technology F. No. SB/SO/HS/0004/2013, New Delhi, for providing us financial assistance and the Department of Pharmaceutical Sciences and Drug Research, Punjabi University, Patiala, India, for supporting us.
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The experimental protocol was approved by the Institutional Animal Ethics Committee, and care of the animals was carried out as per the guidelines of the Committee for the Purpose of Control and Supervision of Experiments on Animals (CPCSEA), Ministry of Environment and Forest, Government of India (Reg. No. 107/99/CPCSEA/2013-37).
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Randhawa, P.K., Jaggi, A.S. Investigating the involvement of TRPV1 ion channels in remote hind limb preconditioning-induced cardioprotection in rats. Naunyn-Schmiedeberg's Arch Pharmacol 390, 117–126 (2017). https://doi.org/10.1007/s00210-016-1311-x
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DOI: https://doi.org/10.1007/s00210-016-1311-x