Abstract
Pure samples of inositol 1,3,4-trisphosphate, inositol 1,3,4,5-tetrakisphosphate and inositol 1,2-cyclic 4,5-trisphosphate were prepared and tested for their ability to mobilize calcium from intracellular stores in a permeabilized Swiss mouse 3T3 cell preparation. In this system inositol 1,4,5-trisphosphate mobilizes Ca2+ with a half-maximal dose of 0.3 microM. Inositol 1,2-cyclic 4,5-trisphosphate mobilized Ca2+ to the same extent with a half-maximal dose of 0.3 microM, whereas inositol 1,3,4-trisphosphate required a half-maximal dose of approx. 9 microM to give the same effect. Inositol 1,3,4,5-tetrakisphosphate was ineffective up to 20 microM and at that concentration did not antagonize the mobilization induced by inositol 1,4,5-trisphosphate. The relevance of these findings to the function of the inositol tris/tetrakis-phosphate pathway is discussed.
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Selected References
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