Aims: Cardiac arrest and cardiopulmonary resuscitation (CPR) can lead to intestinal ischemia/reperfusion (I/R) injury. Increasing studies have indicated that hydrogen sulfide (H2S) is in favor of a variety of tissue I/R injury. The purpose of this study was to explore whether sodium hydrosulfide (NaHS), a H2S donor, can protect intestinal mucosa after CPR and its potential mechanisms.
Main methods: Male Sprague-Dawley rats were subjected to 6min cardiac arrest induced by transcutaneous electrical epicardium stimulation and then resuscitated successfully. A bolus of either NaHS (0.5mg/kg) or placebo (NaCl 0.9%) was blindly injected 1min before the start of CPR intravenously, followed by a continuous injection of NaHS (2mg/kg/h) or placebo for 3h. Intestinal and plasma samples were collected for assessments 24h after CPR.
Key findings: We found that NaHS can markedly alleviate cardiac arrest induced intestinal mucosal injury. Rats treated with NaHS showed a lower malondialdehyde content, higher superoxide dismutase activity and glutathione content in intestine after CPR. Increased intestinal myeloperoxidase activity was significantly decreased by NaHS after CPR. Moreover, a reduced intestinal apoptotic cells after CPR were evident when pretreated with NaHS. Further studies indicated that NaHS enhances the expression of hypoxia-inducible factor-1α (HIF-1α) in intestine after CPR.
Significance: Our data demonstrated that NaHS treatment before CPR induces intestinal mucosal protection 24h post-resuscitation. The protective effects may be through oxidative stress reduction, inflammation alleviation, apoptosis inhibition and HIF-1α activation.
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