An investigation of postmortem urotensin II receptor levels in brain and kidney tissues in a rat model of cardiac ischemia

Abstract

This study aimed to investigate changes in postmortem urotensin II receptor (UTR) levels in brain and kidney tissues in a rat model of cardiac ischemia. The rats were divided into two groups: a control group and a cardiac ischemia-induced group. Cardiac ischemia was created by an intraperitoneal injection of a single lethal dose of isoproterenol (ISO; 850 mg/kg). Plasma UT, blood urea nitrogen, and creatinine levels were determined 0 h postmortem. Brain and kidney UTR mRNA expression levels were determined 0, 1, 3, 6, 12, 24, 48, and 72 h postmortem. The histopathological appearance of brain and kidney tissues was also evaluated. Plasma UT and plasma creatinine levels were increased in the cardiac ischemia-induced group as compared with those in the control group (P < 0.001). Ischemia resulted in histopathological changes in brain and cerebellum tissue. The morphological evaluation revealed Purkinje cell degeneration (P = 0.037) and dark neurons (P = 0.004). The UTR expression level decreased after 1 h postmortem in the brain and after 3 h postmortem in the kidneys in the cardiac ischemia-induced group as compared with that in the control group (P < 0.001). The observed changes in UTR expression levels may be valuable in clinical practice in the field of forensic medicine. These changes may be used as a marker in postmortem evaluations of sudden death caused by ischemia-induced cardiac shock.

Keywords

• Brain
• cardiac ischemia
• kidney
• postmortem
• urotensin II receptor expression