Abstract
The present study was designed to investigate the genotoxicity of 4-hydroxycyclophosphamide (4-OHCP) and phosphoramide mustard (PAM), both reactive metabolites of cyclophosphamide (CP), for possible differences in SCE-inducing activity in mouse T- and B-lymphocytes. Mouse peripheral blood lymphocytes were isolated and stimulated to divide with either phytohemagglutinin (T-cell mitogen) or lipopolysaccharide (a polyclonal B-cell activator). Significant concentration-dependent increases in SCE frequencies were observed for both 4-OHCP and PAM with both mitogens, with 4-OHCP being almost twice as potent as PAM. There was no difference in SCE response between T- and B-lymphocytes after exposure to either PAM or 4-OHCP. These data do not support the idea that the difference in SCE response in T- and B-lymphocytes by CP in vivo is due to differential responses to either of the proposed putative metabolites of CP.
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