Cultura primária in vitro de células embrionárias de Rhipicephalus (Boophilus) microplus e Amblyomma cajennense como substrato para cultivo de Borrelia burgdorferi

Abstract

Embryonic cells of tick in vitro constitute an important one tool for culture and study of the biology of B. burgdorferi. Spirochetes Borrelia burgdorferi is the aetiologic agent of borreliose of Lyme in U.S.A. and Europe, where it is transmitted by tick of the Ixodes genus. The aim of this work was in vitro to cultivate B. burgdorferi (American Cepa G39/40) in primary culture of embryonic cells of Rhipicephalus (B.) microplus and the A. cajennense. From the primary culture of embryonic cells of R. (B.) microplus were performed subculture maintained with medium Leibovitz's (L-15) free of antibiotic, that later it were changed by medium Barbour-Stoener-Kelly (BSK). After the addition of the BSK inoculated B. burgdorferi of and also in Tube of Leighton (TL) with free BSK of cells (control) in a final concentration of 6x106 spirochetes/mL. The embryonic cells of the A. cajennense initially were cultivated in medium L-15 with antibiotic, which was substituted by the BSK. Later, 1,1x107 spirochetes/mL in medium BSK cultivated was inoculated, and also in TL controlled free of cells. All the culture was incubated at 34ºC. The development of the culture was observed in microscope of inverted contrast of phase, as well as the countings of B. burgdorferi performed in chamber of neubauer. Cover glass of the TL had been stained with Giemsa. It was evidenced by the observation in microscope of inverted contrast of phase the survival, attach and multiplication of B. burgdorferi, in the embryonic cells of R. (B.) microplus and A. cajennense. It did not have differences in the finale counting of spirochetes cultivated in cells of R. (B.) microplus when compared with the free control of cells, but on with cells of the A. cajennense, the number amount approximately was 1,9x107 spirochetes/mL, and while in the tube it has controlled free of cells was 1x106 spirochetes /mL. The culture of cells of tick R. (B.) microplus and the A. cajennense have potential to be used as substratum for culture of B. burgdorferi, and study of its development.