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Pharmaceutical Sciences Institute, Aston University, Birmingham B4 7ET, United Kingdom [P. T. T., T. M. M., M. J. T.]; Department of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London WC1E 7HT, United Kingdom [D. J. M.]; and Department of Medical Biochemistry, Shiga University of Medical Science, Shiga 520-21, Japan [H. U., I. O.]
Cancer patients with weight loss showed urinary excretion of a lipid-mobilizing factor (LMF), determined by the ability to stimulate lipolysis in isolated murine epididymal adipocytes. Such bioactivity was not detectable in the urine of cancer patients without weight loss or in normal subjects. The LMF was purified using a combination of ion exchange, exclusion, and hydrophobic interaction chromatographies to give a single component of apparent Mr 43,000, which showed homology in amino acid sequence with human plasma Zn-
2-glycoprotein. Both substances showed the same mobility on denaturing and nondenaturing gels and the same chymotrypsin digestion pattern, both stained heavily for carbohydrate, and they showed similar immunoreactivity. Polyclonal antisera to human plasma Zn-2-glycoprotein was also capable of neutralization of the bioactivity of human LMF in vitro. Using competitive PCR to quantify expression of Zn-2-glycoprotein, we found that only those tumors that were capable of producing a decrease in carcass lipid expressed mRNA for Zn-2-glycoprotein. These results provide strong evidence to suggest that tumor production of Zn-2-glycoprotein is responsible for the lipid catabolism seem in cancer patients.
1 To whom requests for reprints should be addressed.
Received 10/ 6/97. Accepted 4/ 1/98.
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