Evaluation of the Protective Effects of Cyclosporin A and FK506 on Abnormal Cytosolic and Mitochondrial Ca2+ Dynamics During Ischemia and Exposure to High Glutamate Concentration in Mouse Brain Slice Preparations

Journal of Pharmacological Sciences

Akibumi Omi⁴  Shouichi Ohta³  Tadashi Tanoue¹  Tomoharu Yokoyama³  Yoshihisa Kudo²  Hiroyuki Uchino⁴  Yukio Ikeda³  Erika Hasegawa² 

[1] Department of Anesthesiology, Kumamoto Regional Medical Center, Japan;School of Life Science, Tokyo University of Pharmacy and Life Sciences, Japan;Department of Emergency and Critical Care Medicine and Neurosurgery, Tokyo Medical University Hachioji Medical Center, Japan;Department of Anesthesiology, Tokyo Medical University, Japan

关键词: ischemia;    glutamate;    Ca2+ overloading;    cyclosporin A;    FK506;   

DOI  :  10.1254/jphs.12145FP

学科分类：药学

来源: Nihon Yakuri Gakkai Henshuubu / Japanese Pharmacological Society

【 摘 要 】

References(45)Cited-By(2)We examined the protective effects of the immunosuppressants cyclosporin A (CsA) and FK506 on abnormal cytosolic Ca2+ ([Ca2+]c) and mitochondrial Ca2+ concentration ([Ca2+]m) dynamics induced by ischemia or high L-glutamate concentration in mouse brain slice preparations. We used fura-4F and rhod-2 as indicators for [Ca2+]c and [Ca2+]m, respectively, in their acetoxymethylester form. Slice preparations loaded with either of these two indicators were exposed to ischemic artificial cerebrospinal fluid (oxygen- and glucose-deprived medium) for 12 min or to aerobic medium with high L-glutamate concentration (isotonic 20 mM L-glutamate) for 5 min. CsA (1 – 10 μM) showed significant protective effects on the maximum increase in ischemia-induced [Ca2+]c and [Ca2+]m. FK506 (10 μM) showed significant protective effects on the [Ca2+]m increase, but not on the ischemia-induced [Ca2+]c increase. Both immunosuppressants showed almost equal protective effects on the [Ca2+]c and [Ca2+]m increases induced by high L-glutamate concentration. These results suggest that the protective effects of CsA and FK506 on Ca2+ overloading may be dependent upon the common pharmacological sites of actions relating to their effects as immunosuppressants. The small, but significant depressant effects of these drugs could give us important clues for rescuing critical brain damage induced by Ca2+ overloading.

【 授权许可】

Unknown