Estudo biométrico de formas epimastigotas e tripomastigotas de quatro cepas de trypanosoma cruzi, Chagas 1909 (Kinetoplastidae, Trypanosomatidae)

Made available in DSpace on 2014-06-11T19:27:55Z (GMT). No. of bitstreams: 0 Previous issue date: 2007-11-26Bitstream added on 2014-06-13T19:36:15Z : No. of bitstreams: 1 rossi_lrl_me_arafcf.pdf: 682047 bytes, checksum: 215bd6a830c595069af77cb75cbaee6d (MD5) Universidade Estadual Paulista (UNESP) Este estudo visou mensurar formas tripomastigotas e epimastigotas de Trypanosoma cruzi das cepas Bolívia, QM2, S.I.9 e Y por meio de microscópio óptico acoplado a um analisador de imagens e programa Leica QWin. Para tanto utilizou-se os parâmetros definidos por DIAS, FREITAS FILHO (1943) e BARRETO (1965): distâncias da extremidade posterior ao meio do núcleo (PN), do meio do núcleo à extremidade anterior do corpo (NA), comprimento do flagelo (FL), comprimento total (T), largura (L), Área do Cinetoplasto (AC), Área do Núcleo (NA) e Índice Nuclear (IN). Mensurou-se 360 formas tripomastigotas sanguíneas, 120 formas epimastigotas de meio de cultura LIT e 120 formas epimastigotas de fezes de triatomíneo de T. cruzi de cada uma das cepas Bolívia, QM2, S.I.9 e Y. Os oito parâmetros definidos para caracterização das formas tripomastigotas sanguíneas foram mensurados anteriormente ao pico de parasitemia, durante o pico e posteriormente ao pico de parasitemia para as formas tripomastigotas sanguíneas. As quatro cepas de T. cruzi mostraram percentual distinto de formas finas, intermediárias e largas das formas tripomastigotas sanguíneas. De acordo com os parâmetros morfométricos as formas foram classificadas em fina, intermediária e larga no que se refere à largura e curta, intermediária e longa com relação ao comprimento. As mensurações das formas tripomastigotas sanguíneas de T. cruzi das cepas Bolívia, QM2, S.I.9 e Y quanto a largura mostraram os seguintes resultados: as formas finas variaram entre 0,6 e 1,3μm; intermediárias entre 1,4 e 2,1μm; largas entre 2,2 e 5,5μm. Quanto ao comprimento total obtevese para a forma curta variação entre 13,5 e 19,5μm; para a forma intermediária entre 19,6 e 24,7μm; para a forma longa entre 24,8 e 43,8μm. As formas epimastigotas de meio de cultura LIT apresentaram... This study aimed the measurement of trypomastigotes and epimastigote of Trypanosoma cruzi from Bolivia strains, QM2, S.I.9 and Y by means of an optical microscope coupled to an image analyses program called Leica QWin. The following parameters defined for DIAS, FREITAS FILHO (1943) & BARRETO (1965) were used for these measurements: distance from the posterior extremity to the middle of the nucleus (PN), from the middle of the nucleus to the anterior extremity of the body (NA), flagellum length (FL), total length (T), width (L), kinetoplast area (AC), nucleus area (NA) and nuclear index (IN). 360 blood-stream forms were measured, 120 epimastigote forms in the LIT culture mean and 120 epimastigote forms from triatomine feces of T. cruzi for each of the Bolivia strains, QM2, S.I.9 and Y. All eight defined parameters for trypomastigote forms characterization were measured before the parasitemia peak, during the peak and after the parasitemia peak. The four T. cruzi strains showed to be distinct when comparing the percentage in the thin, intermediary and large forms of trypomastigotes. According the morphometric parameters the forms were classified as thin, intermediary and wide regarding width, and short, intermediary and long regarding length. The measurements of trypomastigote blood stream forms of T. cruzi from Bolivia strains QM2, S.I.9 and Y regarding width showed the following results: the thin form varied from 0.6 to 1.3μm; the intermediary from 1.4 to 2.1μm; wide from 2.2 to 5.5μm. Now the total length obtained for the short form varied from 13.5 to 19.5μm; for the intermediary form from 19.6 to 24.7μm; for the long form from 24.8 to 43.8μm. The epimastigote forms in the LIT culture mean presented the following measurements related to width: thin forms between 1.1 and 1.7μm, intermediary forms between 1.8 and 2.8μm.