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Titolo:
Trichites of Strombidium (Ciliophora, Oligotrichida) are extrusomes
Autore:
Modeo, L; Petroni, G; Bonaldi, M; Rosati, G;
Indirizzi:
Dipartimento Etol, I-56126 Pisa, Italy Dipartimento Etol Pisa Italy I-56126 artimento Etol, I-56126 Pisa, Italy
Titolo Testata:
JOURNAL OF EUKARYOTIC MICROBIOLOGY
fascicolo: 1, volume: 48, anno: 2001,
pagine: 95 - 101
SICI:
1066-5234(200101/02)48:1<95:TOS(OA>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
N-SP; EXTRUSIVE ORGANELLES; DEFENSIVE FUNCTION; PARAMECIUM CELLS; MORPHOLOGY; TRICHOCYSTS; EXOCYTOSIS; PROTISTS;
Keywords:
cytochemistry; cytoskeletal elements; extrusive organelles; protozoa; Strombidiidae; ultrastructure;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
21
Recensione:
Indirizzi per estratti:
Indirizzo: Rosati, G Dipartimento Etol, Evoluz Via A Volta 4-6, I-56126 Pisa, Italy Dipartimento Etol Evoluz Via A Volta 4-6 Pisa Italy I-56126 aly
Citazione:
L. Modeo et al., "Trichites of Strombidium (Ciliophora, Oligotrichida) are extrusomes", J EUKAR MIC, 48(1), 2001, pp. 95-101

Abstract

The trichites of Strombidium and related genera have been considered either as a cytoskeletal armature or as extrusomes. To demonstrate their true nature, a study was undertaken on two marine Strombidium species by ultrastructural and cytochemical analysis as well as in vivo experiments. Trichites,extending from the cortex into the cell, are rod-shaped, membrane-bounded,and have a complex structure. The following elements of the trichites, aredistinguishable: an electron-transparent lumen, a laminated layer, and a compact layer. In trichites of one species, thin "rings" surround the lumen. Numerous short, curved tubules with a polysaccharide wall are present in the cytoplasm surrounding the trichites. At the conical end, each trichite is enveloped by a ''cap'' of electron-dense proteinaceous material. In some cases, the cortical alveoli appear interrupted, forming a "hole" for trichite ejection. Ejection of rod-shaped structures, up to 5 times longer than resting trichites, was obtained by in vivo treatments with dextran and aminoethyldextran. Negative staining indicated that these structures were transformed trichites. As no other possible extrusive structures were observed inthe cytoplasm of Strombidium, trichites were considered extrusomes.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/01/21 alle ore 02:44:43