Cyclophosphamide effect on paracoccidioidomycosis in the rat Efecto de la ciclofosfamida en ratas con paracoccidioidomicosis
Paracoccidioidomycosis is an endemic fungal disease widely distributed throughout Latin America. The potent immunosuppressor cyclophosphamide (CY) has been used to modulate host immune response to Paracoccidioides brasiliensis in an experimental model. Inbred male Buffalo/Sim rats weighing 250-300 g...
| Published in: | Revista do Instituto de Medicina Tropical de São Paulo |
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| Main Authors: | , , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Universidade de São Paulo (USP)
1995
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| Subjects: | |
| Online Access: | https://doi.org/10.1590/S0036-46651995000300007 https://doaj.org/article/13716926850c4d0989fb8d3b56a62e67 |
| Summary: | Paracoccidioidomycosis is an endemic fungal disease widely distributed throughout Latin America. The potent immunosuppressor cyclophosphamide (CY) has been used to modulate host immune response to Paracoccidioides brasiliensis in an experimental model. Inbred male Buffalo/Sim rats weighing 250-300 g were inoculated with 5 x 10(6) P. brasiliensis cells of the yeast phase form by intracardiac route. One group of animals was treated with 20 mg/kg body weight at days +4, +5, +6, +7, +11 and +12 post-infection (pi.), while a control group was infected alone. No mortality was recorded in either group. Treated rats presented: a) a decrease in granuloma size, which contained less fungal cells; b) a lack of specific antibodies up to 35 days pi., and c) a significant increase in the footpad swelling test (DTH) against paracoccidioidin. Splenic cell transfer from CY-treated P. brasiliensis-infected donors to recipients infected alone led to a significant increase in DTH response in the latter versus untreated infected controls. Likewise, in treated infected recipients transferred with untreated infected donor spleen cells, footpad swelling proved greater than in controls. Thus, it would seem that each successive suppressor T lymphocyte subset belonging to the respective cascade may be sensitive to repeated CY doses administered up to 12 days pi. Alternatively, such CY schedule may induce the appearance of a T cell population capable of amplifying DTH response. La paracoccidioidomicosis es una enfermedad endémica fúngica ampliamente distribuida en Latino-América. La ciclofosfamida ha sido usada como potente inmunosupresor para modular la respuesta inmune, en un modelo experimental infectado con Paracoccidioides brasiliensis. Ratas machos Buffalo/Sim endocriadas de 250-300 gr. de peso, fueron inoculadas por via intracardiaca con 5.10 6 células de P. brasiliensis en fase levaduriforme. Un grupo de animales fue tratado con 20 mg/kg de peso de ciclofosfamida en los dias +4, +5, +6, +7, +11 y +12 p. i. mientras que un grupo ... |
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