Effects of repeated stress on expression of interleukin-6 (IL-6) and IL-6 receptor mRNAs in rat hypothalamus and midbrain

We examined the effects of single and repeated stress on the expression of interleukin-6 (IL-6) and IL-6 receptor (IL-6R) mRNAs in the rat midbrain an d hypothalamus using reverse transcriptase-polymerase chain reaction (RT-PC R). Following a single episode of restraint stress for 4 hours (1R) or 4 ho urs per day on two (2R) or three (3R) consecutive days, the hypothalamus an d midbrain were removed immediately and the levels of IL-6 and IL-6R mRNAs in both regions were determined. Regional differences in stress-related cha nges in mRNA levels were noted. The expression of IL-6 mRNA in the hypothal amus did not change in 1R group but decreased in 2R and 3R groups. The expr ession of IL-6R mRNA in the same region significantly dminished in all grou ps. In the midbrain, the expression of IL-6 mRNA increased in 1R group and decreased in 2R and 3R, while the expression of IL-6R mRNA significantly di minished in 1R and 3R groups but was not different from control in 2R group . Our findings indicate that:repeated stress in rats produce changes in IL- 6 and IL-6R mRNAs in the midbrain and hypothalamus that are different than those of a (C) 1999 Elsevier Science Inc.