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Am J Physiol Regul Integr Comp Physiol (July 8, 2002). doi:10.1152/ajpregu.00259.2002
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Articles in PresS, published online ahead of print July 4, 2002
Am J Physiol Regu Physiol, 10.1152/ajpregu.00259.2002
Submitted on May 10, 2002
Accepted on June 28, 2002

THE ANTERIOR PARAVENTRICULAR THALAMUS MODULATES LIGHT-INDUCED PHASE SHIFTS IN CIRCADIAN RHYTHMICITY IN RATS

Alberto Salazar-Juarez1, Carolina Escobar2, and Raul Aguilar-Roblero1*

1 Departamento de Neurociencias, Instituto de Fisiologia Celular, Universidad Nacional Autonoma de Mixico, Mexico, D.F., Mexico
2 Departamento de Anatomia, Facultad de Medicina, Universidad Nacional Autonoma de Mexico, Mexico, D.F., Mexico

* To whom correspondence should be addressed. E-mail: raguilar{at}ifisiol.unam.mx.

The reciprocal connections between the paraventricular thalamic nucleus(PVT) and the suprachiasmatic nuclei suggest that PVT may participate in the regulation of circadian rhythms. We studied in rats the effect of lesions of the anterior and mid-posterior regions of the PVT on phase shifts of drinking circadian rhythm induced by light pulses at circadian times 6, 12 and 23, as well as the phase shifts produced by electrical or glutamatergic stimulation of the anterior PVT at the same circadian times. Lesion of the anterior PVT abolishes the advances induced by light during late subjective night, while mid-posterior PVT lesions did not affect the phase shifts. Electrical stimulation or glutamate injections in the anterior PVT mimic the phase shifting effects of light pulses. These results indicate the participation of the anterior PVT as a modulator of entrainment of circadian rhythms to light.




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