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Published on: October 2, 2015
Tumor-associated antigens of rat moloney sarcoma cells. II. Cytosol antigens
Abstract:
Rat Moloney sarcoma cells (MST) were pulsed with 35S-L-methionine for 10 and 60 min and lysed by vortexing in 0.5% deoxycholate, 0.5% NP40, 0.02 M Tris, 0.05 M NaCl, pH 7.5, for 30 sec. The lysate was centrifuged at 16,300 X G for 10 min and the supernatant was co-precipitated with Ig fractions of normal BN serum, normal Lewis serum, BN antiserum to Moloney sarcoma cells (BNaMST), BN antiserum to tumor-associated antigens (BNaTAA), BN antiserum to murine leukemia virus (BNaMuLV), BN antiserum to p30 (BNap30), BN antiserum to gp70 (BNagp70), Lewis antiserum to BN (LeaBN), and BN antiserum to BC5 tumor (BNaBC5). With BNaTAA and BNaMST, a cytoplasmic TAA with m.w. 85,000 was detected. In addition, BNaTAA detected three other species of cytoplasmic TAA with m.w. 220,000, 170,000 and 39,000.
Insights
Researchers identified a cytoplasmic tumor-associated antigen (TAA) in rat Moloney sarcoma cells. This TAA has a molecular weight of 85,000 and was detected using specific antisera, aiding in cancer research.
Area of Science:
- Oncology
- Immunology
- Biochemistry
Background:
- Moloney sarcoma virus induces tumors in rats, making its cells a model for cancer research.
- Tumor-associated antigens (TAAs) are proteins expressed on tumor cells, crucial for immune surveillance and potential therapeutic targets.
Purpose of the Study:
- To identify and characterize cytoplasmic tumor-associated antigens (TAAs) in rat Moloney sarcoma cells (MST).
- To investigate the molecular weights and potential expression patterns of these TAAs.
Main Methods:
- Rat MST cells were metabolically labeled with 35S-L-methionine.
- Cell lysates were prepared using a detergent-based buffer and centrifuged.
- Supernatants underwent co-precipitation with various antisera, including those against Moloney sarcoma cells and tumor-associated antigens.
- Immunoprecipitated proteins were analyzed to identify TAAs.
Main Results:
- A cytoplasmic TAA with a molecular weight of 85,000 was detected using antisera to Moloney sarcoma cells (BNaMST) and tumor-associated antigens (BNaTAA).
- The BNaTAA also identified three additional cytoplasmic TAAs with molecular weights of 220,000, 170,000, and 39,000.
Conclusions:
- Specific antisera can effectively identify and characterize cytoplasmic TAAs in Moloney sarcoma cells.
- The identified TAAs, particularly the 85,000 m.w. protein, represent potential targets for further immunological and therapeutic investigation in sarcoma research.
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