Abstract
Murine L1210 leukemia cells, which display sensitivity or resistance to the chemotherapeutic alkylating agent, melphalan, are equivalently sensitive or resistant to the poorly permeable mercurial, p-chloromercuribenzenesulfonate. Cells of both lines do not differ in sensitivity to the sulfhydryl reagents, N-ethylmaleimide, iodoacetamide and iodoacetate or to the glutathione transferase substrates 1-chloro-2,4-dinitrobenzene and p-nitrobenzyl chloride. The results are interpreted in terms of the known biological reactivity of p-chloromercuribenzenesulfonate as a selective reagent for sulfhydryl groups of membrane proteins associated with monovalent cation permeability.
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