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Fos expression induced by warming the preoptic area in rats
Kyoko Yoshida1, Megumi Maruyama, Takayoshi Hosono
1Department of Physiology and Biosignalling, Graduate School of Medicine, Osaka University, Yamadaoka 2-2, Suita, Osaka 565-0871, Japan.
Brain Research
|April 5, 2002
Summary
Local warming of the preoptic area (POA) in rats reveals its role in thermoregulation. The POA sends excitatory signals to the supraoptic nucleus and periaqueductal gray, and inhibitory signals to the magnocellular paraventricular nucleus and dorsomedial hypothalamus.
Area of Science:
- Neuroscience
- Physiology
- Thermoregulation
Background:
- The preoptic area (POA) is vital for thermoregulation.
- Its efferent projections controlling effector responses remain largely unknown.
Purpose of the Study:
- To investigate the efferent projections of the POA in thermoregulation.
- To map Fos expression changes in response to localized POA warming.
Main Methods:
- Immunohistochemical analysis of Fos expression in freely moving rats.
- Utilized a novel thermode for chronic, localized POA warming.
- Manipulated ambient temperature (22°C and 5°C) alongside POA warming.
Main Results:
- Local POA warming increased Fos expression in the supraoptic nucleus (SON) and periaqueductal gray (PAG).
- Cold exposure (5°C) induced Fos expression in the magnocellular paraventricular nucleus (mPVN) and dorsomedial hypothalamus (DMH).
- Warming the POA suppressed Fos expression in the mPVN and DMH during cold exposure.
Conclusions:
- The POA exerts excitatory control over the SON and PAG for thermoregulation.
- The POA exerts inhibitory control over the mPVN and DMH during thermal challenges.
- These findings elucidate critical pathways in central thermal control.