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Leptin and obesity.
D A de Luis1, J L Perez Castrillón, A Dueñas
1Institute of Endocrinology and Nutrition, Medical School and Unit of Investigation, Hospital Rio Hortega, University of Valladolid, Simancas, Valladolid, Spain. dadluis@yahoo.es
Minerva Medica
|February 3, 2009
Summary
Leptin, a key hormone in energy balance, influences reproduction, metabolism, and immunity. Research into leptin gene (LEP) and receptor (LEPR) variants reveals links to obesity and other diseases, highlighting potential therapeutic targets.
Area of Science:
- Endocrinology
- Genetics
- Molecular Biology
Background:
- Leptin, a 167-amino acid protein produced by adipocytes, shares structural similarities with cytokines.
- The leptin receptor (OB-R), a member of the gp 130 cytokine receptor family, mediates leptin's diverse effects.
- Leptin's functions extend beyond neuroendocrine control, impacting maternal-fetal interactions, reproduction, lipid deposition, insulin sensitivity, and immune-endocrine system links.
Purpose of the Study:
- To review the structure, function, and genetic basis of leptin and its receptor.
- To explore the association of leptin with obesity and metabolic disorders.
- To highlight emerging roles of leptin in other conditions like inflammatory bowel disease, cancer, bone formation, and asthma.
Main Methods:
- Review of existing literature on leptin and its receptor.
- Analysis of genetic studies reporting LEP and LEPR gene mutations and polymorphisms.
- Synthesis of data on leptin's physiological and pathological roles.
Main Results:
- The LEP gene is located on human chromosome 7, with identified mutations and polymorphisms (e.g., A19G, C(-188)A, V110M).
- The LEPR gene maps to human chromosome 1p31, with common variants including K656N and K109R.
- Leptin is implicated in obesity and metabolic disorders, with new associations emerging in inflammatory diseases, cancer, and bone metabolism.
Conclusions:
- Leptin plays a crucial role in regulating various physiological processes.
- Genetic variations in LEP and LEPR contribute to disease pathogenesis.
- Further research into the leptin pathway may uncover novel therapeutic strategies for obesity and related conditions.
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