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Exp Parasitol. 2008 Jan;118(1):17-24. Epub 2007 May 10.

A contractile vacuole complex is involved in osmoregulation in Trypanosoma cruzi.

Author information

1
Department of Pathobiology and Medical Scholars Program, University of Illinios at Urbana-Champaign, Urbana, IL 61801, USA.

Abstract

Acidocalcisomes are dense, acidic organelles with a high concentration of phosphorus present as pyrophosphate and polyphosphate complexed with calcium and other cations. Acidocalcisomes have been linked to the contractile vacuole complex in Chlamydomonas reinhardtii, Dictyostelium discoideum, and Trypanosoma cruzi. A microtubule- and cyclic AMP-mediated fusion of acidocalcisomes to the contractile vacuole complex in T. cruzi results in translocation of aquaporin and the resulting water movement which, in addition to swelling of acidocalcisomes, is responsible for the volume reversal not accounted for by efflux of osmolytes. Polyphosphate hydrolysis occurs during hyposmotic stress, probably increasing the osmotic pressure of the contractile vacuole and facilitating water movement.

PMID:
17574552
PMCID:
PMC2243178
DOI:
10.1016/j.exppara.2007.04.013
[Indexed for MEDLINE]
Free PMC Article

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