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2015 ; 308
(9
): R800-6
Nephropedia Template TP
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Medial nucleus tractus solitarius oxytocin receptor signaling and food intake
control: the role of gastrointestinal satiation signal processing
#MMPMID25740340
Ong ZY
; Alhadeff AL
; Grill HJ
Am J Physiol Regul Integr Comp Physiol
2015[May]; 308
(9
): R800-6
PMID25740340
show ga
Central oxytocin (OT) administration reduces food intake and its effects are
mediated, in part, by hindbrain oxytocin receptor (OT-R) signaling. The neural
substrate and mechanisms mediating the intake inhibitory effects of hindbrain
OT-R signaling are undefined. We examined the hypothesis that hindbrain
OT-R-mediated feeding inhibition results from an interaction between medial
nucleus tractus solitarius (mNTS) OT-R signaling and the processing of
gastrointestinal (GI) satiation signals by neurons of the mNTS. Here, we
demonstrated that mNTS or fourth ventricle (4V) microinjections of OT in rats
reduced chow intake in a dose-dependent manner. To examine whether the intake
suppressive effects of mNTS OT-R signaling is mediated by GI signal processing,
rats were injected with OT to the 4V (1 ?g) or mNTS (0.3 ?g), followed by
self-ingestion of a nutrient preload, where either treatment was designed to be
without effect on chow intake. Results showed that the combination of mNTS OT-R
signaling and GI signaling processing by preload ingestion reduced chow intake
significantly and to a greater extent than either stimulus alone. Using enzyme
immunoassay, endogenous OT content in mNTS-enriched dorsal vagal complex (DVC) in
response to ingestion of nutrient preload was measured. Results revealed that
preload ingestion significantly elevated endogenous DVC OT content. Taken
together, these findings provide evidence that mNTS neurons are a site of action
for hindbrain OT-R signaling in food intake control and that the intake
inhibitory effects of hindbrain mNTS OT-R signaling are mediated by interactions
with GI satiation signal processing by mNTS neurons.