Summary
The potential immunosuppressant activity of the following compounds derived from cyclophosphamide (CPA) was evaluated: 8 known metabolites, oxidation products and hydrolytic products of CPA containing the mustard moiety; the mixture of alkylating products formed from CPA by chemical and biological oxidation in vitro; acrolein. Mechlorethamine (HN2) and mannomustine were included in this survey as reference compounds.
Drug action on lymphoid cells was assayed by ability to block/prevent 2 immunological diseases in rats (GvHR, EAE), GvHR in mice, and the mitogen response of human peripheral lymphocytes. These drug activities of the mustards and CPA derivatives are compared with their toxic/cytostatic and lipophilic properties.
It is proposed that some of the more hydrophilic mustards and CPA metabolites may deactivate lymphocytes through an exoalkylating action upon the cell surface — possibly reacting with membrane-associated DNA —exemplifying the concept of a cell surface poison or ‘ZOG’.
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Whitehouse, M.W., Beck, F.W.J., Dröge, M.M. et al. Lymphocyte deactivation by (potential immunosuppressant) alkylating metabolites of cyclophosphamide. Agents and Actions 4, 117–124 (1974). https://doi.org/10.1007/BF01966821
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DOI: https://doi.org/10.1007/BF01966821