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Captopril increases endothelin serum concentrations and preserves intestinal mucosa after mesenteric ischemia-reperfusion injury

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Research in Experimental Medicine

Abstract

Endothelial cells modulate the tone of the underlying smooth muscle by generating endothelium-derived relaxing and constricting factors. Captopril (CPT), unlike other angiotensin-converting enzyme (ACE) inhibitors, contains a sulfhydryl (-SH) group and can act as a free radical scavenger. Iloprost (ILO) is a synthetic analogue of prostacyclin and mimics the effects of this compound. This study was designed to investigate the effect of ILO and CPT on the mechanism of endothelin (ET) release after mesenteric ischemia-reperfusion (I/R) injury in the rat. Sprague-Dawley rats were divided into five groups: sham-operated, control, ILO (25 μg/kg), CPT (10 μg/kg), and ILO+CPT. The superior, mesenteric artery was occluded for 30 min and then allowed 90 min of reperfusion, except in the sham-operated group, and the corresponding agents were given to the treated groups prior to I/R injury. After I/R injury, portal venous blood was obtained for ET assay, and ileal tissue samples were also obtained for the determination of malondialdehyde (MDA), prostaglandin E2 (PGE2) and leukotriene C4 (LTC4) and for histopathological examination. MDA levels were significantly lower in the CPT, ILO and, ILO+CPT groups than in the control group, indicating the inhibition of lipid peroxidation in all groups. ET levels increased in the control group, and this increase was reversed with ILO. In the CPT group, ET levels were significantly increased, and the addition of ILO did not affect this increase. Significant cytopreservative effect was achieved with ILO and CPT, the latte being more prominent histopathologically. CPT exerts a significant protective effect on the intestinal mucosa after I/R injury. This protection is accomplished by increased ET levels and seems to be unrelated to its inhibitory effect on lipid peroxidation and also unrelated to the arachidonic acid cascade.

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Authors and Affiliations

  1. Department of Surgery, Marmara University, School of Medicine, Istanbul, Turkey

    Oĝuzhan Büyükgebiz, A. Özdemir Aktan, Cumhur Yeĝen & Rifat Yalin

  2. Department of Biochemistry, Marmara University, School of Medicine, Istanbul, Turkey

    A. Süha Yalçin & Gonca Haklar

  3. Department of Pharmacology, Gazi University, School of Medicine, Ankara, Turkey

    Z. Sevim Ercan

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  1. Oĝuzhan Büyükgebiz
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  2. A. Özdemir Aktan
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  3. Cumhur Yeĝen
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  4. A. Süha Yalçin
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  5. Gonca Haklar
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  6. Rifat Yalin
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  7. Z. Sevim Ercan
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Büyükgebiz, O., Aktan, A.Ö., Yeĝen, C. et al. Captopril increases endothelin serum concentrations and preserves intestinal mucosa after mesenteric ischemia-reperfusion injury. Res. Exp. Med. 194, 339–348 (1994). https://doi.org/10.1007/BF02576396

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  • DOI: https://doi.org/10.1007/BF02576396

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