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A form of cell death with some features resembling apoptosis in the amitochondrial unicellular organism Trichomonas vaginalis

Lookup NU author(s): Dr Christophe Noel


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One of hallmarks of apoptosis is the degradation and concomitant compaction of chromatin. It is assumed that caspases and caspase-independent pathways are rate limiting for the development of nuclear apoptosis. The caspase-independent pathway involves apoptosis-inducing factor (AIF) and leads to DNA fragmentation and peripheral chromatin condensation. Both pathways are the result of activation of death signals that the mitochondrion receives, integrates, and responds to with the release of various molecules (e.g., cytochrome c and AIF). In fact, both pathways have in common the final point of the DNA fragmentation and the mitochondrial origin of molecules that initiate the apoptotic events. Here, we examine the question of whether apoptosis or apoptotic-like processes exist in a unicellular organism that lacks mitochondria. We herein show that a form of cell death with some features resembling apoptosis is indeed present in Trichomonas vaginalis. Characterization of morphological aspects implicated in this event together with the preliminary biochemical data provided may lead to new insight about the evolutionary relationships between the different forms of programmed cell death identified so far.

Publication metadata

Author(s): Noel C; Chose O; Gerbod D; Brenner C; Viscogliosi E; Roseto A

Publication type: Article

Publication status: Published

Journal: Experimental Cell Research

Year: 2002

Volume: 276

Issue: 1

Pages: 32-39

ISSN (print): 0014-4827

ISSN (electronic): 1090-2422

Publisher: Academic Press


DOI: 10.1006/excr.2002.5496


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