(redirected from Rhoptries)


, pl.


(rōp'trē, -trēs),
Electron-dense club-shaped, tubular or saccular organelles, extending back from the anterior end of sporozoites and other stages of certain sporozoans in the subphylum Apicomplexa.
[G. rhopalon, club]
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References in periodicals archive ?
Parasites lacking plasmepsin IX had defective rhoptries.
The team found plasmepsin IX in rhoptries, specialised cell structures inside the parasite, which help to invade Red Blood Cells.
In addition, an oval-shaped nucleus, conoids, rhoptries and dense granules were also observed (Fig.
Rhoptries were markedly decreased in size, the outer structures showed wave-like folding and there was conspicuous projection lined only by plasma membrane.
The invasive stages of apicomplexans are characterized by the presence of an apical complex composed of specialized cytoskeletal and secretory organelles, including Rhoptries (14).
Processing of Toxoplasma ROP1 protein in nascent rhoptries.
Micronemes and rhoptries are specialized secretory organelles of the Apicomplexa, whose contents are thought to be essential for successful invasion of host cells.
During invasion and creation of the PV membrane, apically oriented organelles called micronemes and rhoptries are discharged, followed later by release of dense granules content (DG).
The anterior third of the merozoite was filled with a large number of the electron-dense small micronemes, followed, in behind, by a few number of large-size rhoptries of the same electron density (Fig.
However, in this work a residual body was seen and the ducts of rhoptries seemed to be longer than those recorded from other Choleoeimeria species (Paperna, 2007b).
In order to invade the host cell they employ an arsenal of virulence factors derived from the specialised secretory organelles; the micronemes, rhoptries and dense granules that are sequentially secreted during the invasion process.
Our recent research has established endosomal-like compartments as a key organelle for the specific sorting to micronemes and rhoptries.