RETINAL, NPY- AND 5-HT- INPUTS TO THE AGED SUPRACHIASMATIC NUCLEUS IN COMMON MARMOSETS (Callithrix jacchus)

Publication date: Available online 10 March 2017
Source:Neuroscience Research
Author(s): Rovena C.G.J. Engelberth, Kayo D. de Azevedo Silva, Felipe Porto Fiuza, Joacil Germano Soares, Miriam S.M.O. Costa, Ruthnaldo R. de Melo Lima, Expedito Silva do Nascimento, José R. dos Santos, José R.L.P Cavalcanti, Jeferson S. Cavalcante
The circadian timing system (CTS) anticipates optimal physiological patterns in response to environmental fluctuations, such as light-dark cycle. Since age-related disruption of circadian synchronization is linked to several pathological conditions, we characterized alterations of neurochemical constituents and retinal projections to the major pacemaker of CTS, the suprachiasmatic nucleus (SCN), in adult and aged marmosets. We used intraocular injections of neural tracer Cholera toxin b (CTb) to report age-related reductions in CTb, neuropeptide Y and serotonin immunoreactivities. Considering these projections arise in SCN from nuclei that relay environmental information to entrain the circadian clock, we provide important anatomical correlates to age-associated physiological deficits.



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