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. 1991 Apr 15;275(Pt 2):407–411. doi: 10.1042/bj2750407

The inositol phosphate/diacylglycerol signalling pathway in Trypanosoma cruzi.

R Docampo 1, O P Pignataro 1
PMCID: PMC1150068  PMID: 2025225

Abstract

Using [32P]Pi and [3H]inositol as precursors, we have detected the presence of phosphatidylinositol, phosphatidylinositol 4-phosphate and phosphatidylinositol 4,5-bisphosphate, and their derivatives inositol phosphate, inositol 1,4-bisphosphate and inositol 1,4,5-trisphosphate respectively, in Trypanosoma cruzi epimastigotes. Using digitonin-permeabilized cells it was possible to detect a stimulation in the formation of inositol 1,4,5-trisphosphate and inositol 1,4-bisphosphate as well as an increased generation of diacylglycerol in the presence of 1 mM-CaCl2. These results are consistent with the operation of a functional inositol phosphate/diacylglycerol pathway in T. cruzi, and constitute the first demonstration of the presence and activation of this pathway in a parasitic protozoan. These results also indicate that this pathway is conserved during evolution from lower to higher eukaryotic organisms.

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Selected References

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