Effect of ischemia/reperfusion on bladder nerve and detrusor cell damage |
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Authors: | Yung-Shun Juan Shu Mien Chuang Barry A. Kogan Anita Mannikarottu Chun-Hsiung Huang Robert E. Leggett Catherine Schuler Robert M. Levin |
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Affiliation: | (1) Department of Urology, Kaohsiung Municipal Hsiao-Kang Hospital, Kaohsiung, Taiwan, ROC;(2) Graduate Institute of Medicine, Department of Urology, Kaohsiung Medical University, Kaohsiung, Taiwan, ROC;(3) Albany Medical College, Albany, NY, USA;(4) Albany college of Pharmacy, 106 New Scotland Avenue, Albany, NY 12208, USA;(5) Stratton Veterans Affairs Medical Center, Albany, NY, USA |
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Abstract: | Ischemia, reperfusion, and subsequent free radical damage have been implicated in many voiding disorders. Our goal was to investigate further the mechanisms of these disorders, with particular emphasis on nerve and mitochondrial function and on detrusor smooth-muscle cells. The effects on contractile responses to various stimulations, citrate synthase, choline acetyltransferase activities, and vesicular acetylcholine transporter were evaluated after ischemia alone and ischemia/reperfusion 2 h, 7 days, and 14 days. Nerve density and detrusor cell apoptosis were also measured. The contractile responses were significantly decreased at both 7 and 14 days reperfusion, although at 14 days some recovery was observed. Similar patterns were seen for the intramural nerves, both nerve cell cytoskeletal structures and cholinergic neurotransmitters. Citrate synthase activity was also depressed by ischemia and 2 h reperfusion, but the activity recovered by 7 days. Detrusor cell apoptosis was not significantly affected by ischemia and 2 h reperfusion; but showed an approximately 14-fold increase at both 7 and 14 days reperfusion. Reperfusion following ischemia resulted in worsening intramural bladder nerve dysfunction, nerve fiber injury, mitochondrial injury, and damaged detrusor muscle cells. However, at 14 days reperfusion, nerve and mitochondrial regeneration occurred and resulted in partial recovery of contractile function. |
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Keywords: | Ischemia Reperfusion Bladder Nerve Apoptosis |
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