An assay of mammalian cell micropermeabilization based on measurements of cellular lactate production.

A method for the quantitative assay of mammalian cell micropermeabilization is described. The method is based on the permeabilization-induced loss of endogenous glycolytic cofactors and consequent discontinuation of cellular lactate production. Advantages of the method include sensitivity and precision similar to that of micropermeabilization assays based on the release of 86Rb+ from preloaded cells, avoidance of radioactivity, and simplicity of the measurements and equipment required.