Gamma-radiation upregulates MHC class I/II and ICAM-I molecules in multiple myeloma cell lines and primary tumors

In Vitro Cellular & Developmental Biology. Animal
Maurizio Chiriva-InternatiEverardo Cobos

Abstract

The gamma-irradiation of normal cells causes an increased synthesis of specific proteins. However, few studies have described the effects of high doses of irradiation on the expression of cell surface antigens in tumor cells. This study analyzed the effects of high doses of gamma-irradiation on the surface antigen expression of Major Histocompatability Complex (MHC) class I/II and intercellular adhesion molecule-1 (ICAM-I) in human multiple myeloma (MM) cell lines ARP-1, ARK-RS, and 10 MM primary tumors. The expression of surface antigens was evaluated by fluorescence-activated cell sorter analysis at different time points, following the exposure to high doses of gamma-irradiation. Doses of 10,000 and 15,000 cGy were not sufficient to totally block cell replication in both cell lines and primary tumors; cell replication was able to be inhibited completely only at 18,000 cGy. Lower doses (10,000 cGy) and lethal doses of irradiation (i.e., 15,000 and 18,000 cGy) increased the expression of all surface antigens present on the cells before irradiation. Essentially, such upregulation was shown to be dose dependent, with higher radiation doses resulting in higher antigen expression. Furthermore, when the kinetics of this upregulation...Continue Reading

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Methods Mentioned

BETA
fluorescence-activated cell sorter
Flow cytometry

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