Summary
Dimethyl sulphoxide (DMSO) causes some release of amino acids, adenine nucleotides,
and acid phosphatase and β-glucuronidase activities from washed human platelets. Addition
of vitamin A with DMSO greatly enhances the effect; but vitamin A in ethanol added
to platelets fails to release amino acids and nucleotides. Release appears to be due
to a change in permeability of the platelet membrane, not to the discharge of contents
of intracellular structures. Lipid peroxidation of membrane phospholipids, or a similar
reaction, may be involved. Thrombin causes a different type of alteration in platelet
permeability.
The results suggest that DMSO should not be used as a preservative for platelets.
They may have some bearing on the mechanisms of toxicity of DMSO and vitamin A.