IBYME   02675
INSTITUTO DE BIOLOGIA Y MEDICINA EXPERIMENTAL
Unidad Ejecutora - UE
artículos
Título:
Impact of the Proestrous Milieu on the Expression of Orexin Receptors and Prepro-Orexin in Rat Hypothalamus and Hypophysis. Actions of Cetrorelix and Nembutal
Autor/es:
SILVEYRA, P; CATALANO, P. N; LUX-LANTOS VA; LIBERTUN C
Revista:
AMERICAN JOURNAL OF PHYSIOLOGY-ENDOCRINOLOGY AND METABOLISM
Referencias:
Año: 2007 vol. 292 p. 820 - 828
ISSN:
0193-1849
Resumen:
Orexins and their receptors OX1 and OX2 regulate energy balance and sleep-wake cycle.
We studied the expression of prepro-orexin (PPO), OX1 and OX2 in brain and pituitary
under the influence of the hormonal status in adult rats. Primarily, PPO, OX1 and OX21 and OX2 regulate energy balance and sleep-wake cycle.
We studied the expression of prepro-orexin (PPO), OX1 and OX2 in brain and pituitary
under the influence of the hormonal status in adult rats. Primarily, PPO, OX1 and OX21 and OX2 in brain and pituitary
under the influence of the hormonal status in adult rats. Primarily, PPO, OX1 and OX21 and OX2
expression was determined in Sprague-Dawley female cycling rats during proestrus and in
males. Animals were sacrificed at two hours intervals. Anterior (AH) and mediobasal
(MBH) hypothalamus, anterior pituitary (P) and frontoparietal cortex (CC), were
homogenized in TRIzol and mRNAs obtained for screening of PPO, OX1, OX2 expression
by semiquantitative RT-PCR. Main findings were confirmed and extended to all days of the
cycle by quantitative real-time RT-PCR. Hormones and food consumption were
determined. Finally, OX1, OX2 and PPO were measured by real-time RT-PCR in tissues
collected at 19:00 h of proestrus after treatments at 14:00 h with ovulation blocking agents,
Cetrorelix or Pentobarbital.
OX1 and OX2 expression increased at least three-fold in AH, MBH and P, but not in CC,
between 17:00 h and 23:00 h of proestrus, without variations in estrus, diestrus or males.
PPO in AH and MBH showed a four-fold or higher increase only during proestrous
afternoon. Cetrorelix or Pentobarbital prevented increases of OX1 and OX2 only in the
pituitary and blunted gonadotropin surges, but left OX1, OX2 and PPO brain expression
unchanged.
Reproduction, energy balance and sleep-wake cycle are integrated. Here we demonstrate
that in the physiological neuroendocrine condition leading to ovulation, information to the
orexinergic system acts in hypothalamus and pituitary by different mechanisms.
Key words: Orexin Receptors, Prepro-Orexin, Hypothalamus, Adenohypophysis, Estrous
Cycle.1, OX2 expression
by semiquantitative RT-PCR. Main findings were confirmed and extended to all days of the
cycle by quantitative real-time RT-PCR. Hormones and food consumption were
determined. Finally, OX1, OX2 and PPO were measured by real-time RT-PCR in tissues
collected at 19:00 h of proestrus after treatments at 14:00 h with ovulation blocking agents,
Cetrorelix or Pentobarbital.
OX1 and OX2 expression increased at least three-fold in AH, MBH and P, but not in CC,
between 17:00 h and 23:00 h of proestrus, without variations in estrus, diestrus or males.
PPO in AH and MBH showed a four-fold or higher increase only during proestrous
afternoon. Cetrorelix or Pentobarbital prevented increases of OX1 and OX2 only in the
pituitary and blunted gonadotropin surges, but left OX1, OX2 and PPO brain expression
unchanged.
Reproduction, energy balance and sleep-wake cycle are integrated. Here we demonstrate
that in the physiological neuroendocrine condition leading to ovulation, information to the
orexinergic system acts in hypothalamus and pituitary by different mechanisms.
Key words: Orexin Receptors, Prepro-Orexin, Hypothalamus, Adenohypophysis, Estrous
Cycle.1, OX2 and PPO were measured by real-time RT-PCR in tissues
collected at 19:00 h of proestrus after treatments at 14:00 h with ovulation blocking agents,
Cetrorelix or Pentobarbital.
OX1 and OX2 expression increased at least three-fold in AH, MBH and P, but not in CC,
between 17:00 h and 23:00 h of proestrus, without variations in estrus, diestrus or males.
PPO in AH and MBH showed a four-fold or higher increase only during proestrous
afternoon. Cetrorelix or Pentobarbital prevented increases of OX1 and OX2 only in the
pituitary and blunted gonadotropin surges, but left OX1, OX2 and PPO brain expression
unchanged.
Reproduction, energy balance and sleep-wake cycle are integrated. Here we demonstrate
that in the physiological neuroendocrine condition leading to ovulation, information to the
orexinergic system acts in hypothalamus and pituitary by different mechanisms.
Key words: Orexin Receptors, Prepro-Orexin, Hypothalamus, Adenohypophysis, Estrous
Cycle.1 and OX2 expression increased at least three-fold in AH, MBH and P, but not in CC,
between 17:00 h and 23:00 h of proestrus, without variations in estrus, diestrus or males.
PPO in AH and MBH showed a four-fold or higher increase only during proestrous
afternoon. Cetrorelix or Pentobarbital prevented increases of OX1 and OX2 only in the
pituitary and blunted gonadotropin surges, but left OX1, OX2 and PPO brain expression
unchanged.
Reproduction, energy balance and sleep-wake cycle are integrated. Here we demonstrate
that in the physiological neuroendocrine condition leading to ovulation, information to the
orexinergic system acts in hypothalamus and pituitary by different mechanisms.
Key words: Orexin Receptors, Prepro-Orexin, Hypothalamus, Adenohypophysis, Estrous
Cycle.1 and OX2 only in the
pituitary and blunted gonadotropin surges, but left OX1, OX2 and PPO brain expression
unchanged.
Reproduction, energy balance and sleep-wake cycle are integrated. Here we demonstrate
that in the physiological neuroendocrine condition leading to ovulation, information to the
orexinergic system acts in hypothalamus and pituitary by different mechanisms.
Key words: Orexin Receptors, Prepro-Orexin, Hypothalamus, Adenohypophysis, Estrous
Cycle.1, OX2 and PPO brain expression
unchanged.
Reproduction, energy balance and sleep-wake cycle are integrated. Here we demonstrate
that in the physiological neuroendocrine condition leading to ovulation, information to the
orexinergic system acts in hypothalamus and pituitary by different mechanisms.
Key words: Orexin Receptors, Prepro-Orexin, Hypothalamus, Adenohypophysis, Estrous
Cycle.