Motherhood and nursing stimulate c-FOS expression in the rabbit forebrain.

Gabriela González‐Mariscal · Angeles Jiménez · Rosario Chirino · Carlos Beyer

44 citations0/0 files storedBehavioral Neuroscience

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Neuroendocrine regulation and behavior Stress Responses and Cortisol Hypothalamic control of reproductive hormones

Abstract

Mother rabbits nurse once daily with circadian periodicity. The authors investigated brain structures involved in regulating this activity by quantifying c-FOS-immunoreactive (IR) cells in the forebrain of: (1) mothers killed on postpartum Day 1 (PPD 1) after nursing (Group 1) or not given pups (Group 2); (2) mothers killed on PPD 7 after nursing (Group 3) or not given pups on such day (Group 4); (3) unmated virgins (Group 5). Groups 1 through 4 showed similar numbers of c-FOS-IR cells in the preoptic area, an amount around three to fourfold larger than that found in virgins. Nursing increased, on PPD 1 and 7, c-FOS-IR cell number in the lateral septum and paraventricular and supraoptic nuclei. No differences were seen among Groups 1 through 5 in the suprachiasmatic nucleus. In the ventromedial hypothalamus virgins had more c-FOS-IR cells compared with Groups 1 and 2. Results suggest that specific forebrain structures participate in regulating particular aspects of rabbit maternal behavior: the POA and LS seem associated with the establishment of motherhood and the magnocellular nuclei with the occurrence of milk letdown.

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References

2009Hormones, Brain and Behavior 2003The Neurobiology of Parental Behavior 1997Forebrain expression of c-fos due to active maternal behaviour in lactating rats 1994Expression of Fos-like immunoreactivity in the preoptic area of maternally behaving virgin and postpartum rats.1994Activation of Fos-like immunoreactivity in the medial preoptic area and limbic structures of maternal and social interactions in rats.1996Plasticity in the maternal circuit: Effects of maternal experience on Fos-Lir in hypothalamic, limbic, and cortical structures in the postpartum rat.1995Importance of pup-related sensory inputs and maternal performance for the expression of Fos-like immunoreactivity in the preoptic area and ventral bed nucleus of the stria terminalis of postpartum rats.1994Maternal behavior in New Zealand white rabbits: Quantification of somatic events, motor patterns, and steroid plasma levels

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