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Role of the central amygdaloid nucleus in shaping the discharge of gustatory neurons in the rat parabrachial nucleus
Brain Research Bulletin 61(2003)443-452,-0001,():
The central amygdaloid nucleus (CeA) receives projection from the parabrachial nucleus (PBN) gustatory neurons and descendingly projectsto the PBN. To assess if the CeA is involved in modulating the activity of gustatory neurons in the PBN, the effects of electrical stimulation andelectrolytic lesion of CeA on PBN gustatory neurons were observed. Of 60 neurons observed, 30 were classified as NaCl-best, 18 as HCl-best,5 as Quinine HCl (QHCl)-best, and 7 as sucrose-best. During CeA stimulation, the responses to at least one effective stimulus were inhibitedin most PBN neurons, with the response magnitudes to HCl and QHCl significantly decreased (P<0.01). In contrast, bilateral lesions of CeAfacilitated the responses to HCl and QHCl (P<0.01). According to the best-stimulus category, the effects on the responses to HCl and QHClwere similarly subjected to these modulations either during electrical stimulation or after electrolytic lesions of CeA. Analyses of across-unitpatterns indicated that the CeA stimulation increased the chemical selection of PBN taste neurons while the CeA lesions depressed the effecton the chemical selection between NaCl and QHCl. These findings suggest that the CeA may be involved in mediating feeding behavior viamodulating the activity of gustatory neurons of PBN.
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