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on behavior in mice
1 Institut National de la Santé et de la Recherche Médicale U394, Neurobiologie Intégrative, 33077 Bordeaux Cedex, France; and 2 Department of Animal Sciences, University of Illinois, Urbana, Illinois 61801
In the immune system, interleukin (IL)-1
effects are mediated by the type I IL-1 receptors (IL-1RI), whereas the
type II IL-1 receptors (IL-1RII) act as inhibitory receptors. IL-1RI
and IL-1RII are also present in the brain. To study their functionality in the brain, mice were centrally treated with neutralizing monoclonal antibody (MAb) directed against IL-1RI (35F5, 1 µg) or
against IL-1RII (4E2, 2 µg) and were centrally injected with
recombinant rat IL-1
at a dose (2 ng) that decreased social
exploration. Only 35F5 was effective in abrogating the behavioral
effect of IL-1
. Moreover, 4E2 (1 µg icv) did not potentiate the
behavioral response to a subthreshold dose of IL-1
(1 ng icv). To
examine the ability of brain IL-1RI to mediate the effects of
endogenous IL-1
, mice were centrally treated with 35F5 (4 µg) and
peripherally injected with IL-1
(1 µg). Like IL-1 receptor
antagonist (4 µg icv), 35F5 abrogated the effects of IL-1
. These
results suggest that brain IL-1RI mediates the behavioral effects of
IL-1
in mice.
antibodies; social exploration; mouse
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