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Hypothalamic lesions increase neuronal immunoreactivity for neuropeptide Y
1Department of Anatomy, Howard University, Washington, DC 20059.
Brain Research Bulletin
|September 1, 1992
Summary
Goldthioglucose (GTG) induced hypothalamic lesions enhance neuropeptide Y (NPY) production in mice. This suggests NPY stimulation by lesions may cause hyperphagia, a key factor in appetite regulation syndromes.
Area of Science:
- Neuroscience
- Endocrinology
- Physiology
Background:
- Neuropeptide Y (NPY) is implicated in hyperphagia syndromes.
- The role of NPY in lesion-induced hyperphagia remains unexplored.
Purpose of the Study:
- To investigate the effect of hypothalamic lesions on NPY production.
- To determine if NPY stimulation contributes to lesion-induced hyperphagia.
Main Methods:
- Hypothalamic lesions were induced in mice using goldthioglucose (GTG).
- Immunocytochemistry was used to visualize NPY-immunoreactive neurons in brain sections.
- NPY production was assessed in control and lesioned mice without colchicine pretreatment.
Main Results:
- NPY-immunoreactive somas were rarely observed in control mice.
- NPY-immunoreactive somas were significantly increased in mice with GTG-induced hypothalamic lesions.
- GTG lesions appear to enhance NPY production.
Conclusions:
- Hypothalamic lesions, induced by GTG, enhance NPY production.
- Interruption of inhibitory dopaminergic pathways may contribute to increased NPY.
- Stimulation of NPY production by hypothalamic lesions is a potential mechanism for inducing hyperphagia.