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Multiple antigens recognized by anti-c-myc antibodies in human cells and Xenopus oocytes
A W Gibson1, R Ye, R N Johnston
1Department of Medical Biochemistry, University of Calgary, Alta., Canada.
Abstract:
We have investigated the localization, solubility, serum regulation, and phosphorylation of MYC antigens from Colo 320 cells, a human transformed cell line with an amplified c-myc gene, and from Xenopus oocytes, which express high levels of c-myc mRNA. Although MYC proteins are often reported to range from 60 to 68 kilodaltons, our panel of anti-MYC monoclonal antibodies recognized a number of higher and lower molecular mass antigens, in addition to proteins within this range. Based upon various criteria, including cross-recognition by several anti-MYC antibodies, we suggest that some of these antigens are bona fide MYC family proteins. Our results, as well as those of others reported previously, suggest that several MYC antigens may be simultaneously present in cells. The apparent diversity among members of the MYC family of antigens raises the possibility of multiple cellular functions and regulatory roles for these proteins.
Insights
This study reveals diverse MYC antigens in human cells and Xenopus oocytes, suggesting multiple functions for these important cancer-related proteins.
Area of Science:
- Molecular Biology
- Cell Biology
- Cancer Research
Background:
- The MYC gene family plays critical roles in cell growth and cancer.
- MYC proteins are typically reported within a specific molecular weight range.
- Understanding MYC antigen diversity is crucial for deciphering their functions.
Purpose of the Study:
- To investigate the characteristics of MYC antigens in Colo 320 cells and Xenopus oocytes.
- To identify and characterize diverse MYC family proteins beyond the commonly reported range.
- To explore the potential for multiple cellular functions of MYC proteins.
Main Methods:
- Utilized a panel of anti-MYC monoclonal antibodies.
- Analyzed MYC antigen localization, solubility, serum regulation, and phosphorylation.
- Investigated MYC expression in a human transformed cell line (Colo 320) and Xenopus oocytes.
Main Results:
- Identified MYC antigens with molecular masses both within and outside the typical 60-68 kilodalton range.
- Confirmed the presence of bona fide MYC family proteins through antibody cross-recognition.
- Observed evidence suggesting the simultaneous presence of several MYC antigens within cells.
Conclusions:
- The MYC protein family exhibits greater diversity in molecular mass than previously recognized.
- Multiple MYC family members may coexist within the same cell.
- This antigenic diversity implies varied cellular functions and regulatory roles for MYC proteins in biological processes and disease.