Adenosine and Purine Nucleosides Prevent the Disruption of Mitochondrial Transmembrane Potential by Peroxynitrite in Rat Primary Astrocytes

Choi, Ji-Woong; Yoo, Byung-Kwon; Ryu, Mi-Kyoung; Choi, Min-Sik; Park, Gyu-Hwan; Ko, Kwang-Ho

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자료유형: 학술저널

저자정보: Choi, Ji-Woong (Department of Pharmacology, College of Pharmacy, Seoul National University) Yoo, Byung-Kwon (Department of Pharmacology, College of Pharmacy, Seoul National University) Ryu, Mi-Kyoung (Department of Pharmacology, College of Pharmacy, Seoul National University) Choi, Min-Sik (Department of Pharmacology, College of Pharmacy, Seoul National University) Park, Gyu-Hwan (Department of Pharmacology, College of Pharmacy, Seoul National University) Ko, Kwang-Ho (Department of Pharmacology, College of Pharmacy, Seoul National University)

저널정보: 대한약학회 Archives of pharmacal research : a publication of the Pharmaceutical Society of Korea Archives of pharmacal research : a publication of the Pharmaceutical Society of Korea 제28권 제7호

발행연도: 2005.1

수록면: 810 - 815 (6page)

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Previously, we have shown that astrocytes deprived of glucose became highly vulnerable to peroxynitrite, and adenosine and its metabolites attenuated the gliotoxicity via the preservation of cellular ATP level. Here, we found that adenosine and related metabolites prevented the disruption of mitochondrial transmembrane potential (MTP) in glucose-deprived rat primary astrocytes exposed to 3-morpholinosydnonimine (SIN-1), a peroxynitrite releasing agent. Exposure to glucose deprivation and SIN-1(2h) significantly disrupted MTP in astrocytes, and adenosine prevented it in dose-dependent manner with an $EC_{50}\;of\;5.08{\mu}M$. Adenosine also partially prevented the cell death by myxothiazol, a well-known inhibitor of mitochondrial respiration. Blockade of adenosine deamination or intracellular transport with erythro-9-(-hydroxy-3-nonyl)adenosine (EHNA) or S-(4-nitrobenzyl)-6-thioinosine (NBTI), respectively, completely reversed the protective effect of adenosine. Other purine nucleos(t)ides including inosine, guanosine, ATP, ADP, AMP, ITP, and GTP also showed similar protective effects. This study indicates that adenosine and related purine nucleos(t)ides may protect astrocytes from peroxynitrite-induced mitochondrial dysfunction.

#Adenosine #Mitochondrial transmembrane potential #MTP) #SIN-1 #Peroxynitrite #Astrocyte #Glucose-deprivation

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