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Related Experiment Video

Updated: May 23, 2026

Functional Interrogation of Adult Hypothalamic Neurogenesis with Focal Radiological Inhibition

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Published on: November 14, 2013

Prolactin receptor gene expression in specific hypothalamic nuclei increases with age

S Chiu¹, P M Wise

¹Department of physiology, University of Maryland School of Medicine, Baltimore, USA.

The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences

|May 1, 1996

Summary

Aging increases prolactin receptor mRNA in specific brain regions, suggesting enhanced prolactin responsiveness in older rats. This may contribute to reproductive aging by altering hormone signaling pathways.

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Isolation of Targeted Hypothalamic Neurons for Studies of Hormonal, Metabolic, and Electrical Regulation

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Published on: August 4, 2023

Area of Science:

Neuroendocrinology
Reproductive Biology
Aging Research

Background:

Reproductive aging is linked to hormonal changes, including prolactin.
Altered prolactin levels or sensitivity may influence reproductive senescence.
The role of prolactin receptor expression in aging-related reproductive changes is not fully understood.

Purpose of the Study:

To investigate changes in prolactin receptor mRNA levels in the aging rat brain.
To determine if aging influences prolactin receptor gene expression, potentially increasing prolactin responsiveness.

Main Methods:

Used in situ hybridization to measure prolactin receptor mRNA levels in ovariectomized rats of different age groups (young, middle-aged, old, very old).
Administered estradiol-17 beta via Silastic capsules to all rats.
Analyzed prolactin receptor mRNA expression in specific brain regions, including the choroid plexus, preoptic nucleus, arcuate nucleus, and ventromedial nucleus.

Main Results:

Prolactin receptor mRNA levels significantly increased in the choroid plexus, periventricular area of the preoptic nucleus, and arcuate nucleus in older rats.
No significant changes in prolactin receptor gene expression were observed in the lateral ventromedial nucleus across aging groups.

Conclusions:

Aging is associated with increased prolactin receptor gene expression in specific brain areas.
These changes suggest an enhanced responsiveness to prolactin in older animals.
Altered prolactin receptor expression may play a role in the neuroendocrine mechanisms of reproductive aging.