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Orexins (hypocretins): novel hypothalamic peptides with divergent functions
M S Mondal1, M Nakazato, S Matsukura
1Third Department of Internal Medicine, Miyazaki Medical College, Kiyotake, Japan.
Biochemistry and Cell Biology = Biochimie Et Biologie Cellulaire
|August 19, 2000
Summary
The hypothalamus regulates food intake and body weight. Novel orexins (hypocretins) from the lateral hypothalamus stimulate feeding and interact with diverse brain pathways, offering new insights into energy homeostasis.
Area of Science:
- Neuroscience
- Endocrinology
- Physiology
Background:
- The hypothalamus is critical for regulating food intake and body weight.
- Previous studies implicated hypothalamic 'feeding' and 'satiety' centers in energy homeostasis.
- The discovery of orexin peptides has provided new insights into feeding regulation.
Purpose of the Study:
- To review recent physiological, neuroanatomical, and molecular studies on orexins (hypocretins).
- To highlight the role of orexins in feeding behavior and energy balance.
Main Methods:
- Review of existing literature on orexin/hypocretin research.
- Analysis of neuroanatomical projections and physiological functions.
- Examination of molecular studies on orexin peptides.
Main Results:
- Orexin neurons are localized in the lateral hypothalamus and project widely throughout the brain.
- Orexins primarily stimulate food intake.
- Orexins interact with various neuronal pathways, influencing diverse functions beyond feeding.
Conclusions:
- Orexins (hypocretins) are key neuropeptides in regulating feeding behavior and energy homeostasis.
- The widespread projections of orexins suggest their involvement in multiple physiological processes.
- Further research into orexins offers potential for understanding and treating metabolic disorders.