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Melanin-concentrating hormone in the human brain
T Mouri1, K Takahashi, H Kawauchi
1Second Department of Internal Medicine, Tohoku University School of Medicine, Miyagi, Japan.
Peptides
|May 1, 1993
Summary
Human melanin-concentrating hormone (MCH) is present in high concentrations in the human brain, particularly the hypothalamus. This suggests MCH functions as a key neurotransmitter, neuromodulator, or neurohormone in humans.
Area of Science:
- Neuroscience
- Endocrinology
- Human Physiology
Background:
- Melanin-concentrating hormone (MCH) is a peptide hormone involved in various physiological processes.
- Its presence and specific role in the human brain, especially the hypothalamus, require detailed investigation.
Purpose of the Study:
- To investigate the presence and distribution of human MCH in the brain.
- To determine the potential neurobiological functions of MCH in humans.
Main Methods:
- Radioimmunoassay (RIA) was employed to quantify MCH concentrations.
- Immunocytochemistry was used to visualize MCH distribution in brain tissue.
- High-performance liquid chromatography (HPLC) analyzed MCH molecular forms.
Main Results:
- Immunoreactive MCH concentrations varied across the human brain, with notable levels in the hypothalamus (0.07–19.7 pmol/g).
- HPLC confirmed the presence of human/rat MCH, distinct from salmon MCH.
- Immunostaining revealed MCH in specific hypothalamic nuclei (perifornical, tuberomammillary, posterior) and numerous nerve fibers.
Conclusions:
- The study confirms the presence of significant MCH concentrations in the human hypothalamus.
- Findings suggest MCH plays a crucial role as a neurotransmitter, neuromodulator, or neurohormone in the human central nervous system.