Abstract：
:It has recently been shown that the immunosuppressant cyclosporin A (CsA) dramatically ameliorates the selective neuronal necrosis which results from 10 min of forebrain ischemia in rats. Since CsA is a virtually specific blocker of the mitochondrial permeability transition (MPT) pore which is assembled under adverse conditions, such as mitochondrial calcium accumulation and oxidative stress, the results suggest that the delayed neuronal death is due to an MPT. In the present study we explored whether CsA can also ameliorate the aggravated brain damage which is observed in hyperglycemic subjects, and which encompasses rapidly evolving neuronal lesions, edema, and postischemic seizures. Anaesthetised rats with a plasma glucose concentration of approximately 13 mM were subjected to 10 min of forebrain ischemia, and allowed a recovery period of 7 days. In these animals, CsA prevented seizure from occurring and virtually eliminated neuronal necrosis. In order to allow even higher plasma glucose values (approximately 20 mM) to be studied, with long-term recovery, the duration of ischemia had to be reduced to 5 min. Again, CsA suppressed seizure activity and reduced neuronal damage. However, the effects were not as marked or consistent as in the 10 min group, suggesting that excessive tissue acidosis recruits mechanisms of damage which are not sensitive to CsA.
journal_name
Brain Resjournal_title
Brain researchauthors
Li PA,Uchino H,Elmér E,Siesjö BKdoi
10.1016/s0006-8993(97)00005-xsubject
Has Abstractpub_date
1997-04-04 00:00:00pages
133-40issue
1eissn
0006-8993issn
1872-6240pii
S0006-8993(97)00005-Xjournal_volume
753pub_type
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