Brazilian Journal of Infectious Diseases
On-line version ISSN 1678-4391
HERZOG-SOARES, Joanna D'Arc A and FREIRE, Ronald Bastos. Effect of citrinin and in association with aflatoxin B1 on the infectivity and proliferation of Toxoplasma gondii in vitro. Braz J Infect Dis [online]. 2004, vol.8, n.1, pp. 101-108. ISSN 1678-4391. http://dx.doi.org/10.1590/S1413-86702004000100007.
Macrophages exposed to 10 mg/mL citrinin (CTR) or 0.01 mg CTR mixed with 0.04 mg aflatoxin B1 (AFB1) for a period of 2 h at 37ºC, were infected with 106 Toxoplasma gondii tachyzoites/mL. The parasites were treated with mycotoxins (2 h at 37ºC) before being added to the macrophage culture. The number of tachyzoites was quantified 2, 24, 48, 72 and 96 h after infection. During the first 2 hours, 59% infectivity was observed in the control. After exposure to CTR or the mixture of toxins (CTR-AFB1), macrophages were infected with 77.5% and 75% of the inoculated tachyzoites, respectively. Similarly, 72.3% of the cells were infected when cultured together with previously treated parasites. The treatment with CTR-AFB1 gave rise to 2.9 times more tachyzoites than the control at 72 h. An increased number of parasites was recovered from macrophages exposed to CTR after 96 h, and to CTR-AFB1 after 72 h of culture; The number of tachyzoites recovered from the supernatant was 1.94 and 2.06 times higher, respectively, than in the control (5 x 105 ± 0.054 /mL).
Keywords : Aflatoxins; imunossuspression; macrophages; citrinin; Toxoplasma gondii.