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An anorectic proteoglycan of membrane origin
1Biomembrane Laboratory, Industrial Toxicology, Research Centre, Lucknow, India.
Indian Journal of Biochemistry & Biophysics
|December 1, 1990
Summary
Scientists isolated an anorexigenic proteoglycan from cell membranes that reduces appetite. This substance, rich in carbohydrates, is believed to regulate food intake by circulating in the blood.
Area of Science:
- Biochemistry
- Physiology
- Molecular Biology
Background:
- Endogenous substances regulate food intake.
- Anorexigenic substances have been previously isolated from serum, urine, and feces.
Purpose of the Study:
- To isolate and characterize an anorexigenic proteoglycan from cell membranes.
- To investigate the role of this proteoglycan in appetite regulation.
Main Methods:
- Isolation of proteoglycans from erythrocyte and liver membranes using deoxycholate.
- Purification using Sephadex G-150 and DEAE-Sephadex A-25 chromatography.
- Assessment of biological activity via intraperitoneal administration in rats.
Main Results:
- Anorexigenic proteoglycan (50 kDa) isolated from cell membranes.
- The proteoglycan comprises 70-85% carbohydrate.
- Intraperitoneal administration significantly reduced appetite in rats.
Conclusions:
- The identified proteoglycan originates from cell membranes.
- This membrane-bound substance is released into circulation to regulate food intake.
- The findings suggest a novel mechanism for appetite control involving membrane-derived proteoglycans.