Isoflurane preconditioning improves long-term neurologic outcome after hypoxic-ischemic brain injury in neonatal rats.
BACKGROUND
Preconditioning the brain with relatively safe drugs seems to be a viable option to reduce ischemic brain injury. The authors and others have shown that the volatile anesthetic isoflurane can precondition the brain against ischemia. Here, the authors determine whether isoflurane preconditioning improves long-term neurologic outcome after brain ischemia.


METHODS
Six-day-old rats were exposed to 1.5% isoflurane for 30 min at 24 h before the brain hypoxia-ischemia that was induced by left common carotid arterial ligation and then exposure to 8% oxygen for 2 h. The neuropathology, motor coordination, and learning and memory functions were assayed 1 month after the brain ischemia. Western analysis was performed to quantify the expression of the heat shock protein 70, Bcl-2, and survivin 24 h after isoflurane exposure.


RESULTS
The mortality was 45% after brain hypoxia-ischemia. Isoflurane preconditioning did not affect this mortality. However, isoflurane preconditioning attenuated ischemia-induced loss of neurons and brain tissues, such as cerebral cortex and hippocampus in the survivors. Isoflurane also improved the motor coordination of rats at 1 month after ischemia. The learning and memory functions as measured by performance of Y-maze and social recognition tasks in the survivors were not affected by the brain hypoxia-ischemia or isoflurane preconditioning. The expression of Bcl-2, a well-known antiapoptotic protein, in the hippocampus is increased after isoflurane exposure. This increase was reduced by the inhibitors of inducible nitric oxide synthase. Inducible nitric oxide synthase inhibition also abolished isoflurane preconditioning-induced neuroprotection.


CONCLUSIONS
Isoflurane preconditioning improved the long-term neurologic outcome after brain ischemia. Inducible nitric oxide synthase may be involved in this neuroprotection.
Zhao
Ping
P
Department of Anesthesiology, University of Virginia Health System, 1 Hospital Drive, P.O. Box 800710, Charlottesville, Virginia 22908-0710, USA.
Peng
Longyun
L
Li
Liaoliao
L
Xu
Xuebing
X
Zuo
Zhiyi
Z
D000818:Animals; D000831:Animals, Newborn; D005260:Female; D020925:Hypoxia-Ischemia, Brain / Q000150:complications / Q000188:drug therapy / Q000628:therapy*; D019194:Ischemic Preconditioning / Q000379:methods*; D007530:Isoflurane / Q000494:pharmacology / Q000627:therapeutic use*; D008297:Male; D018782:Maze Learning / Q000187:drug effects / Q000502:physiology; D009048:Motor Skills / Q000187:drug effects / Q000502:physiology; D009422:Nervous System Diseases / Q000188:drug therapy / Q000209:etiology / Q000517:prevention & control*; D018696:Neuroprotective Agents / Q000494:pharmacology / Q000627:therapeutic use; D051381:Rats; D017207:Rats, Sprague-Dawley; D013995:Time; D016896:Treatment Outcome
D018696:Neuroprotective Agents; D007530:Isoflurane