Cerebroventricular Administration of Interferon-Gamma Modifies Locomotor Activity in the Golden HamsterBoggio V.I.a · Castrillón P.O.a,b · Perez Lloret S.a · Riccio P.a · Esquifino A.I.b · Cardinali D.P.a · Cutrera R.A.a
a Departamento de Fisiología, Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires, Argentina; bDepartamento de Bioquímica y Biología Molecular III, Facultad de Medicina, Universidad Complutense, Madrid, Spain Neurosignals 2003;12:89–94 (DOI:10.1159/000071818)
The present study was undertaken to examine whether the intracerebroventricular (i.c.v.) administration of interferon (IFN)-gamma could modify 24-hour wheel running locomotor activity in the golden hamster. Hamsters implanted with a cannula in the third ventricle received a single i.c.v. injection of 1 µl of murine recombinant IFN-gamma (40 IU/µl) or its vehicle (saline) at ZT 6 or ZT 18 (with ZT 12 defined arbitrarily as the time of lights off) and their activities were monitored during 24 h. The i.c.v. administration of IFN-gamma at ZT 6 produced a significant phase advance in acrophase of rhythm, an effect not seen at ZT 18. Also, IFN-gamma depressed mesor value significantly, the effect was seen at both times. These results clearly showed that the circadian clock could be modified by IFN-gamma microinjections. One explanation could be the presence of IFN-gamma receptor in the rat suprachiasmatic nucleus, supporting a direct effect on the central oscillator. However, another hypothesis could not be ruled out.
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