• Youichi Yanagawa, Masato Kawakami, and Yoshiaki Okada.
• Department of Traumatology and Critical Care Medicine, National Defense Medical College, Tokorozawa, Saitama, Japan. yokkom@f7.dion.ne.jp
• Resuscitation. 2002 Apr 1; 53 (1): 93-9.

AbstractFemale C57BL/6 mice were decapitated and their brains were removed and cultured at either 37 or 33 degrees C for 48 h to investigate whether or not moderate hypothermia alters the cytokine reactions in the ischemic brain. The interleukin-6 and interleukin-1alpha levels in the culture media were significantly elevated in a time-dependent manner. The interleukin-6 levels after the incubation at 33 degrees C were significantly lower than those at 37 degrees C. The interleukin-1alpha levels at 33 degrees C were significantly higher than those at 37 degrees C. The interleukin-1alpha levels incubated with interleukin-6 antibody were significantly higher than those without IL-6 antibody. At 37 degrees C, the mRNA expression of interleukin-6 was observed from 2 to 48 h after incubation, but the same expression of interleukin-1alpha was only detected until 12 h. Accordingly, the ischemic brain incubated at 33 degrees C showed a decreased interleukin-6 production in comparison with that at 37 degrees C and the level of interleukin-6 showed negative feedback for the production of interleukin-1alpha. The temperature should, therefore, be carefully considered when evaluating the cytokine reaction for cerebral ischemia.

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