Abstract：
:Production of inflammatory cytokines, including tumor necrosis factor (TNF), interleukin-1 (IL-1) and interleukin-6 (IL-6), in the brain is increased in various diseases. To investigate the relationships between the effect of overproduction of IL-6 in the brain on central and peripheral production of TNF, IL-1 beta and IL-6 itself, we used transgenic mice (NSE-hIL-6) where neuronal human IL-6 expression under the control of the neuronal specific enolase promoter results in astrocytosis and gliosis. These mice had higher cerebral endogenous IL-6 (12-fold), IL-1 beta (12-fold) and TNF (4-fold) production measured in brain homogenates after intracerebroventricular (i.c.v.) injection of 2.5 micrograms LPS, lipopolysaccharide (LPS) than wild-type mice (no TNF or IL-1 were detectable in saline-injected NSE or control mice). Cerebral cytokines production was also increased in NSE-hIL-6 mice treated i.p. with LPS doses that do not normally induce cytokines in the brain. The induction of peripheral (serum or spleen) TNF, IL-1 beta or IL-6 was the same in all these experiments in NSE-hIL-6 and wild-type mice. Furthermore, using microglial cell clone pretreated in vitro with IL-6, we noted an increase in LPS-induced TNF and IL-6 production and proliferation of pretreated cells than control. This study indicates that overproduction of IL-6 in the central nervous system (CNS) may ultimately result in increased central production of inflammatory cytokines, probably due to increased proliferation and activation of the cells which produce cytokine in the CNS.
journal_name
Brain Resjournal_title
Brain researchauthors
Di Santo E,Alonzi T,Fattori E,Poli V,Ciliberto G,Sironi M,Gnocchi P,Ricciardi-Castagnoli P,Ghezzi Pdoi
10.1016/s0006-8993(96)00865-7subject
Has Abstractpub_date
1996-11-18 00:00:00pages
239-44issue
1-2eissn
0006-8993issn
1872-6240pii
S0006-8993(96)00865-7journal_volume
740pub_type
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