Inositol 1,3,4,5-tetrakisphosphate causes release of Ca2+ from permeabilized mouse lymphoma L1210 cells by its conversion into inositol 1,4,5-trisphosphate.
Addition of Ins(1,3,4,5)P4 at micromolar concentrations causes release of Ca2+ from electroporated L1210 cells, but not from digitonin-permeabilized cells. This was shown to be due to its conversion into Ins(1,4,5)P3, because only the electroporated cells convert Ins(1,3,4,5)P4 into Ins(1,4,5)P3. Thus electroporation appears to activate or expose an Ins(1,3,4,5)P4 3-phosphatase.
Cullen
P J
PJ
School of Biological Sciences, University of East Anglia, Norwich, U.K.
Irvine
R F
RF
Drøbak
B K
BK
Dawson
A P
AP
D000818:Animals; D002118:Calcium / Q000378:metabolism*; D002463:Cell Membrane Permeability; D015544:Inositol 1,4,5-Trisphosphate; D007295:Inositol Phosphates / Q000378:metabolism* / Q000494:pharmacology*; D007939:Leukemia L1210 / Q000378:metabolism*; D051379:Mice; D013403:Sugar Phosphates / Q000378:metabolism* / Q000494:pharmacology*; D014407:Tumor Cells, Cultured / Q000187:drug effects
D007295:Inositol Phosphates; D013403:Sugar Phosphates; C081655:inositol-1,3,4,5-tetrakisphosphate; D015544:Inositol 1,4,5-Trisphosphate; D002118:Calcium