The novel H2S-donor 4-carboxyphenyl isothiocyanate promotes cardioprotective effects against ischemia/reperfusion injury through activation of mitoKATP channels and reduction of oxidative stress.

Abstract:

:The endogenous gasotransmitter hydrogen sulphide (H2S) is an important regulator of the cardiovascular system, particularly of myocardial function. Moreover, H2S exhibits cardioprotective activity against ischemia/reperfusion (I/R) or hypoxic injury, and is considered an important mediator of "ischemic preconditioning", through activation of mitochondrial potassium channels, reduction of oxidative stress, activation of the endogenous "anti-oxidant machinery" and limitation of inflammatory responses. Accordingly, H2S-donors, i.e. pro-drugs able to generate exogenous H2S, are viewed as promising therapeutic agents for a number of cardiovascular diseases. The novel H2S-donor 4-carboxy phenyl-isothiocyanate (4CPI), whose vasorelaxing effects were recently reported, was tested here in different experimental models of myocardial I/R. In Langendorff-perfused rat hearts subjected to I/R, 4CPI significantly improved the post-ischemic recovery of myocardial functional parameters and limited tissue injury. These effects were antagonized by 5-hydroxydecanoic acid (a blocker of mitoKATP channels). Moreover, 4CPI inhibited the formation of reactive oxygen species. We found the whole battery of H2S-producing enzymes to be present in myocardial tissue: cystathionine γ-lyase (CSE), cystathionine β-synthase (CBS) and 3-mercaptopyruvate sulfurtransferase (MPST). Notably, 4CPI down-regulated the post-ischemic expression of CSE. In Langendorff-perfused mouse hearts, 4CPI reduced the post-ischemic release of norepinephrine and the incidence of ventricular arrhythmias. In both rat and mouse hearts, 4CPI did not affect the degranulation of resident mast cells. In isolated rat cardiac mitochondria, 4CPI partially depolarized the mitochondrial membrane potential; this effect was antagonized by ATP (i.e., the physiological inhibitor of KATP channels). Moreover, 4CPI abrogated calcium uptake in the mitochondrial matrix. Finally, in an in vivo model of acute myocardial infarction in rats, 4CPI significantly decreased I/R-induced tissue injury. In conclusion, H2S-donors, and in particular isothiocyanate-based H2S-releasing drugs like 4CPI, can actually be considered a suitable pharmacological option in anti-ischemic therapy.

journal_name

Pharmacol Res

journal_title

Pharmacological research

authors

Testai L,Marino A,Piano I,Brancaleone V,Tomita K,Di Cesare Mannelli L,Martelli A,Citi V,Breschi MC,Levi R,Gargini C,Bucci M,Cirino G,Ghelardini C,Calderone V

doi

10.1016/j.phrs.2016.09.006

subject

Has Abstract

pub_date

2016-11-01 00:00:00

pages

290-299

issue

Pt A

eissn

1043-6618

issn

1096-1186

pii

S1043-6618(16)30523-0

journal_volume

113

pub_type

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