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Related Experiment Video

Updated: Jul 15, 2026

Short-Duration Hypothermia Induction in Rats using Models for Studies examining Clinical Relevance and Mechanisms
05:00

Short-Duration Hypothermia Induction in Rats using Models for Studies examining Clinical Relevance and Mechanisms

Published on: March 3, 2021

Short-term cold exposure may cause a local decrease of neuropeptide Y in the rat hypothalamus.

Joong Jean Park1, Heung Kyung Lee, Min Woo Shin

  • 1Department of Physiology, College of Medicine, Korea University, Seoul 136-705, Korea. parkjj@korea.ac.kr

Molecules and Cells
|April 28, 2007
PubMed
Summary

Short-term cold exposure in rats reduces Neuropeptide Y (NPY) production in the hypothalamus, indirectly facilitating thermogenesis without stimulating feeding behavior.

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A Simple and Inexpensive Method for Determining Cold Sensitivity and Adaptation in Mice
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Last Updated: Jul 15, 2026

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Area of Science:

  • Neuroendocrinology
  • Physiology
  • Metabolic regulation

Background:

  • Neuropeptide Y (NPY) is recognized for its roles in appetite stimulation and body temperature regulation.
  • Understanding NPY's function in hypothermic states is crucial for metabolic and thermoregulatory research.

Purpose of the Study:

  • To investigate the impact of acute cold exposure on NPY expression and neuronal activity in the rat hypothalamus.
  • To elucidate the indirect mechanisms by which NPY may influence thermogenesis during cold stress.

Main Methods:

  • Male rats were exposed to cold (4°C) or thermoneutral (24°C) conditions for 1.5 hours.
  • Hypothalamic tissue was analyzed for c-Fos protein, NPY mRNA, and NPY protein expression.
  • Immunohistochemistry was used to assess cell activity and peptide localization.

Main Results:

  • Cold exposure significantly increased c-Fos-positive cells in the paraventricular nucleus (PVN) and arcuate nucleus (ARC).
  • A notable decrease in NPY immunoreactivity and mRNA levels was observed in the PVN and ARC following cold stress.
  • No direct colocalization of c-Fos and NPY was detected, suggesting an indirect regulatory pathway.

Conclusions:

  • Acute cold exposure appears to suppress NPY production in specific hypothalamic nuclei.
  • This suppression may be a key indirect mechanism to promote thermogenesis without triggering feeding responses.
  • Findings suggest a dissociation between NPY's role in feeding and thermoregulation under short-term cold stress.