Opioid µ-receptors in the rostral medullary raphe modulate hypoxia-induced hyperpnea in unanesthetized rats.
Acta Physiol (Oxf)
; 204(3): 435-42, 2012 Mar.
Article
en En
| MEDLINE
| ID: mdl-21827637
ABSTRACT
AIM:
It has been suggested that the medullary raphe (MR) plays a key role in the physiological responses to hypoxia. As opioid µ-receptors have been found in the MR, we studied the putative role of opioid µ-receptors in the rostral MR (rMR) region on ventilation in normal and 7% hypoxic conditions.METHODS:
We measured pulmonary ventilation (VE) and the body temperatures (Tb) of male Wistar rats before and after the selective opioid µ-receptor antagonist CTAP (D-Phe-Cys-Tyr-D-Trp-Arg-Thr-Pen-Thr-NH2, cyclic, 0.1 µg per 0.1 µL) was microinjected into the rMR during normoxia or after 60 min of hypoxia.RESULTS:
The animals treated with intra-rMR CTAP exhibited an attenuation of the ventilatory response to hypoxia (430 ± 86 mL kg(-1) min(-1)) compared with the control group (790 ± 82 mL kg(-1) min(-1) ) (P < 0.05). No differences in the Tb were observed between groups during hypoxia.CONCLUSION:
These data suggest that opioids acting on µ-receptors in the rMR exert an excitatory modulation of hyperventilation induced by hypoxia.
Texto completo:
1
Bases de datos:
MEDLINE
Asunto principal:
Núcleos del Rafe
/
Mecánica Respiratoria
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Receptores Opioides mu
/
Ventilación Pulmonar
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Hiperventilación
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Hipoxia
Tipo de estudio:
Prognostic_studies
Límite:
Animals
Idioma:
En
Revista:
Acta Physiol (Oxf)
Asunto de la revista:
FISIOLOGIA
Año:
2012
Tipo del documento:
Article
País de afiliación:
Brasil