Four distinct human isoenzymes of alkaline phosphatase (AP) are known: intestinal (IAP), placental (PLAP), tissue non-specific (NSAP, also known as liver/bone/kidney AP), and germ cell AP (also known as placental-like AP, PLAP-like).
1 L-
p-Bromotetramisole is a cell-permeable inhibitor of all four human AP isoenzymes (K
is =18 and 56 μM for PLAP and NSAP, respectively).
1,2,3,4 While PLAP is strongly inhibited by L-
p-bromotetramisole, a second AP, possibly PLAP-like, shows only partial inhibition.
3 L-
p-Bromotetramisole has been shown to inhibit a tyrosine phosphatase from
Drosophila and, as a result, is also used as a tyrosine phosphatase inhibitor.
5,6