Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0029463 (osteosarcoma)
 16,637 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Aqueous extracts of acetone/ether powders of surgically obtained specimens of human tumors hydrolyzed 3H-labeled triolein in a dose-dependent manner. The lipolytic activity in these extracts was inhibited by anti-lipoprotein lipase (LPL) IgG dose-dependently, 25 micrograms of anti-LPL IgG causing 95% inhibition of the activity. Thus, LPL accounts for most of the lipolytic activity in extracts of acetone/ether powders of the tumors. All sarcomas and carcinomas examined contained LPL activity. Western blotting showed that they gave a band corresponding to that of human adipose tissue LPL (M(r) = 57,000). Immunocytochemical studies showed that LPL was present in cultured human osteosarcoma cells and distributed throughout the cells. We determined the proliferating cell nuclear antigen (PCNA)-labeling index as an indicator of the proliferative activity of tumor cells and measured LPL activity in extracts of tumors in areas corresponding to those used for determining the PCNA-labeling index. In malignant fibrous histiocytomas, the PCNA-labeling index in area a, which corresponds to the subcapsular region, was higher than that in area b, which corresponds to the central region. The LPL activity in area a was 10 times that in area b. In rectal cancer, the index in area c, which corresponds to the subserosal region, was higher than that in area d, which corresponds to the submucosal region. The LPL activity in area c was 1.9 times that in area d. These findings indicate heterogeneity in the distributions of LPL activity within tumors and higher levels of LPL activity in tumors that are proliferating actively.
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PMID:Existence of lipoprotein lipase in human sarcomas and carcinomas. 791 39

The effect of recombinant human tumour necrosis factor-alpha (TNF-alpha) on synthesis, activity and secretion of lipoprotein lipase (LPL) was examined using a human osteosarcoma cell line, osteosarcoma Takase (OST). Treatment of OST cells with TNF-alpha decreased LPL synthesis, resulting in a decrease in expression of activity and secretion of LPL. When OST cells were incubated with glycerol tri[1-14C]palmitate, TNF-alpha decreased dose- and time-dependently the production of 14CO2 and the amounts of radioactivity incorporated into cellular triacylglycerol and phospholipid. The similar reduction of synthesis and activity of LPL as suppression of CO2 production and cellular lipid synthesis indicated that the suppression of 14CO2 production and 14C-labelled lipid synthesis was secondary. TNF-alpha also suppressed expression of proliferating cell nuclear antigen, indicating that it had an anti-proliferative activity on OST cells. The findings suggest that one cause of the anti-proliferative activity of TNF-alpha is the suppression of the LPL-mediated supply of non-esterified fatty acids as an energy source for growth.
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PMID:Recombinant human tumour necrosis factor-alpha suppresses synthesis, activity and secretion of lipoprotein lipase in cultures of a human osteosarcoma cell line. 867 Jan 56