ABSTRACT
The present study was conducted to identify the effect of vasopressin (AVP) on electrocardiographic changes produced by ischemia-reperfusion. Male rats were divided into seven groups (n=8-13) subjected to 30min ischemia and 120 min reperfusion. In protocol I (control group), saline was administered before ischemia. In protocol II, different doses of AVP (0.015, 0.03, 0.06 and 0.12µg/rat) were infused 10 min before ischemia. In protocol III SR49059 (1 mg/kg), was injected 20 min prior to ischemia with and without the effective dose of AVP (0.03 g/rat). Ischemia-induced arrhythmia and myocardial infarct size (IS) were measured. Different doses of vasopressin decreased IS. There were no significant differences in PR, QRS duration and &DGR;T/amp;DGR;ST ratio between control and intervention groups in ischemia. ST elevation was significantly increased in control and AVP 0.015, 0.03, 0.06 groups during ischemia. In AVP 0.12 group there was no significant difference in ST deviation between the baseline and ischemia phase. JT interval was significantly increased in control and antagonist group during ischemia. AVP 0.12µ/rat prevented the increase of JT interval in ischemia compared to the baseline. In summary, AVP mediated preconditioning improved ST resolution, prevented prolongation of JT interval and decreased the likelihood of subsequently ventricular arrhythmia.
Subject(s)
Cardiotonic Agents/pharmacology , Myocardial Reperfusion Injury/physiopathology , Vasopressins/pharmacology , Animals , Cardiotonic Agents/therapeutic use , Dose-Response Relationship, Drug , Electrocardiography/drug effects , Male , Myocardial Infarction/physiopathology , Myocardial Infarction/prevention & control , Myocardial Reperfusion Injury/prevention & control , Rats , Rats, Wistar , Vasopressins/therapeutic useABSTRACT
BACKGROUND: Endometriosis is a common chronic inflammation which leads to infertility and chronic pelvic pain in affected women. Secretory phospholipase A2 type IIa (sPLA2IIa) is an acute phase reactant that is markedly increased in inflammatory disorders. OBJECTIVE: To assess the effects of ω-3 and ω-6 polyunsaturated fatty acids (PUFAs) administration in endometrial cells culture on sPLA2IIa level and cell survival comparing homolog ectopic versus eutopic endometrial cells from endometriosis patients. MATERIALS AND METHODS: In this experimental study, ectopic and eutopic endometrial tissue samples obtained from 15 endometriosis patients were immediately frozen. After thawing and tissue digestion, mixed stromal and endometrial gland cells were cultured for 8 days in three different culture media; balanced ω-3/ω-6, high ω-3 and high ω-6 PUFAs ratio. Cell survival was measured using 2, 3-bis (2-methoxy-4-nitro-5-sulfophenyl)-5-(phenylamino) carbonyl-2H- tetrazolium hydroxide (XTT) method and sPLA2IIa level assessed with ELISA technique. RESULTS: The sPLA2IIa level was significantly higher in the ectopic endometrial cell culture compared to the eutopic group for each of the three matched treatments (balanced, high ω-3 and high ω-6). Also the sPLA2IIa level in the ectopic endometrial cell group was remarkably increased by each of the three PUFAs treatments compared to control condition (p<0.05, p<0.01, p<0.05 respectively). Cell survival in the eutopic group was significantly decreased by high ω-6 culturing compared to control medium (p<0.05). CONCLUSION: The increase in sPLA2IIa level in ectopic endometrial cells by fatty acid treatments (especially high ω-3), strengthens the hypothesis that PUFAs stimulate secretion of cytokines leading to increased sPLA2IIa level.
