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Several mammalian enzymes are anchored to the outer surface of the plasma membrane by a covalently attached glycosylphosphatidylinositol (GPI) structure. These include acetylcholinesterase, alkaline phosphatase (AP) and 5'-nucleotidase among other enzymes. Recently, it has been reported that these membrane enzymes can be released into the serum by the GPI-dependent phospholipase D under various medical disturbances such as cancer and/or by chemical and physical manipulation of the biological systems. Treatment of MCF-7 cells with two consecutive effective concentrations of 3-hydrogenkwadaphnin (3-HK, 3 nM) for 48 h enhanced membrane AP activity by almost 330% along with a 40% reduction in the AP activity of the cell culture medium. In addition, our data indicate that 3-HK is capable of inducing mainly the tissue-nonspecific alkaline phosphatase (TNAP) isoenzyme, along with enhancing its thermostability. These findings, besides establishing a correlation between the antiproliferative activity of 3-HK and the extent of plasma membrane AP activity, might assist in the development of new diagnostic tools for following cancer medical treatments.

acta biochimica polonica

Plasma membrane homing of tissue nonspecific alkaline phosphatase under the influence of 3-hydrogenkwadaphnin, an antiproliferative agent from Dendrostellera lessertii.