| Popis: |
The naturally occurring tetrakisphosphate myo-inositol-1,3,4, 6-tetrakisphosphate [Ins(1,3,4,6)P4] was able to release Ca2+ from the intracellular stores of permeabilized rabbit platelets but was 40-fold less potent than D-myo-inositol-1,4,5-trisphosphate [Ins(1,4,5)P3]. The Ca2+ releasing activity of Ins(1,3,4,6)P4 was rationalized by envisaging two alternative receptor binding orientations in which the vicinal D-1,6-bisphosphate of Ins(1,3,4,6)P4 mimics the D-4,5-bisphosphate in the Ins(1,4,5)P3 binding conformation. This rationalization predicted that Ins(1,4,5)P3 regioisomers [i.e, D-myo-inositol -1,4,6-trisphosphate [D-Ins(1,4,6)P3] and D-myo-inositol-1,3,6 -trisphosphate [D-Ins(1,3,6)P3]] should also possess Ca(2+)-releasing activity. The unambiguous total synthesis of the enatiomers of Ins(1,4,6)P3 [i.e., D-Ins(1,4,6)P3 and D-Ins(3,4,6)P3] and the enatiomers of Ins(1,3,4)P3 [i.e., D-Ins(1,3,6)P3 and D-Ins(1,3,4)P3] allowed an examination of this prediction. D-Ins(1,4,6)P3 released Ca2+ from the intracellular stores of permeabilized platelets and was only 2-3-fold less potent than Ins(1,4,5)P3. D-Ins(1,3,6)P3 [alternative nomenclature, L-Ins(1,3,4)P3] also released Ca2+ but was 12-fold less potent than Ins(1,4,5)P3. Both D-Ins(1,4,6)P3 and D-Ins(1,3,6)P3 displaced specifically bound [3H]Ins(1,4,5)P3 from the Ins(1,4,5)P3 receptor on rat cerebellar membranes. In contrast, however, D-Ins(3,4,6)P3 [alternative nomenclature, L-Ins(1,4,6)P3] and D-Ins(1,3,4)P3 neither possessed Ca(2+)-releasing activity nor displaced [3H]Ins(1,4,5)P3. The ability of D-Ins(1,3,6)P3 to release Ca2+ in permeabilized platelets is in contrast to its apparent lack of Ca(2+)-mobilizing activity previously reported in rat basophilic leukemic cells. The possibility that this is a reflection of the different Ins(1,4,5)P3 receptor subtypes possessed by these two cell types is discussed. |
