Abstract：
:The hydrogenosome, an organelle that produces molecular hydrogen and ATP from the oxidation of pyruvate or malate under anaerobic conditions, presents some characteristics common to mitochondria. The hydrogenosome of Tritrichomonas foetus, a cattle parasite, is a spherical organelle that presents a peripheral vesicle the origin and behavior of which is poorly known. In this article it is reported an ultrastructural and microanalytical study using energy dispersive X-ray analysis, 3D reconstruction and cytochemistry of the hydrogenosome peripheral vesicle and then compare the results with the endoplasmic reticulum and the nuclear envelope of T. foetus. Similarities between the hydrogenosome peripheral vesicle and the ER are presented. This study included: (1) the detection of ER enzymes by cytochemistry, such as glucose-6-phosphatase, IDPase, acid phosphatase and Ca(2+) -ATPase; (2) elemental composition by X-ray microanalysis and the mapping of calcium, phosphorus and oxygen in both ER and hydrogenosome peripheral vesicle; (3) freeze-fracture; (4) TEM of routine and cryofixed cells by high-pressure freezing and freeze-substitution; (5) 3D reconstruction, (6) monoclonal antibody anti-trichomonads ER; and (6) other cytochemical techniques that detects ER, such as the ZIO and lectins. We found a similar composition of the tested enzymes and other elements present in the ER when compared with the hydrogenosome's peripheral vesicle. It was concluded that, like mitochondria, hydrogenosome presents relationships with the ER, especially the peripheral vesicle.
journal_name
Tissue Celljournal_title
Tissue & cellauthors
Benchimol Mdoi
10.1016/j.tice.2007.09.006subject
Has Abstractpub_date
2008-02-01 00:00:00pages
61-74issue
1eissn
0040-8166issn
1532-3072pii
S0040-8166(07)00097-3journal_volume
40pub_type
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