Dissociated feeding and hypothermic effects of neuropeptide Y in the paraventricular and perifornical hypothalamus.

Abstract:

:The present study investigated the effects of neuropeptide Y (NPY) on food intake and body temperature (Tbo) in free-feeding unrestrained rats following injection into the medial hypothalamic paraventricular nucleus (PVN) or the lateral perifornical hypothalamus (PFH). NPY (78-235 pmol) or saline was infused unilaterally into the PVN or PFH in a volume of 0.4 microliter and simultaneous measures of food intake and Tbo were taken every 30 min for 3 h. Results indicated that NPY evoked changes in eating behavior and Tbo that were dependent upon the site of hypothalamic injection. Although PVN and PFH administration of NPY both increased food intake dose dependently within 30 min of treatment, PFH NPY-injected rats (n = 9) showed a stronger behavioral response compared to rats (n = 9) receiving NPY injections into the PVN. In PVN-treated rats, however, the increased eating was associated with a significant decline in Tbo evident within the first 30-min test interval. A mean maximal decline of 0.92 +/- 0.26 degree C occurred within 90 min of PVN treatment of the highest dose, which produced a reduction in Tbo that was maintained for 2.5 h. In contrast, NPY infusion into the PFH failed to reliably alter Tbo at any of the doses tested. These findings are consistent with evidence that NPY in the PVN and PFH may have distinct functions and suggest that although PFH NPY acts to stimulate a robust and relatively specific ingestive response, PVN NPY may participate in the complex integrative mechanisms responsible for the simultaneous regulation of feeding, thermoregulatory, and metabolic processes.

journal_name

Peptides

journal_title

Peptides

authors

Currie PJ,Coscina DV

doi

10.1016/0196-9781(95)00020-k

subject

Has Abstract

pub_date

1995-01-01 00:00:00

pages

599-604

issue

4

eissn

0196-9781

issn

1873-5169

pii

0196-9781(95)00020-K

journal_volume

16

pub_type

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