Vagotomy blocks the induction of interleukin-1beta (IL-1beta) mRNA in the brain of rats in response to systemic IL-1beta.
There is considerable interest in the mechanisms by which systemic cytokines signal the CNS to elicit centrally controlled biological actions. This study determined the effects of intraperitoneal injections of interleukin-1beta (IL-1beta) on IL-1beta mRNA and IL-1 receptor accessory protein (IL-1RAP) mRNA production in rat liver and brain using the reverse transcription-PCR. Saline or IL-1beta (0.5 microg/kg) was injected intraperitoneally in subdiaphragmatically vagotomized and sham-operated (SHAM) rats. All injections were performed at dark onset, and rats were killed 2 hr after the injection. In SHAM rats, IL-1beta increased IL-1beta mRNA levels in the liver, hypothalamus, hippocampus, and brainstem. Subdiaphragmatic vagotomy blocked the IL-1beta-induced increase in IL-1beta mRNA in the brainstem and hippocampus and significantly attenuated the increase in the hypothalamus. Vagotomy did not affect IL-1beta-induced IL-1beta mRNA production in the liver. IL-1RAP mRNA was highly expressed in each region examined; however, no significant differences in IL-1RAP mRNA production were found in any region after IL-1beta injection. The current results indicate that the vagus nerve is involved in transmitting cytokine signals to the brain and suggest that the induction of brain cytokines is a critical step in the pathway by which vagal-mediated signals result in centrally controlled symptoms of the acute phase response.
Hansen
M K
MK
Department of Physiology and Biophysics, The University of Tennessee, Memphis, Tennessee 38163, USA.
Taishi
P
P
Chen
Z
Z
Krueger
J M
JM
D000818:Animals; D001921:Brain / Q000378:metabolism*; D007274:Injections, Intraperitoneal; D007375:Interleukin-1 / Q000235:genetics* / Q000494:pharmacology*; D053577:Interleukin-1 Receptor Accessory Protein; D008297:Male; D011506:Proteins / Q000235:genetics; D012333:RNA, Messenger / Q000037:antagonists & inhibitors / Q000378:metabolism*; D051381:Rats; D017207:Rats, Sprague-Dawley; D012016:Reference Values; D014628:Vagotomy
C507766:Il1rap protein, rat; D007375:Interleukin-1; D053577:Interleukin-1 Receptor Accessory Protein; D011506:Proteins; D012333:RNA, Messenger