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Surface charge and hydrophobicity of wild and mutantCrithidia fasciculata

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Abstract

Surface charge of wild-typeCrithidia fasciculata and three drug-resistant mutants (TR3, TFRR1, and FUR11) was studied by direct zeta-potential determination and ultrastructural cytochemistry. Surface tension was also investigated by measurements of the advancing contact angle formed by the protozoa monolayers with drops of liquids of different polarities. The individual zeta potential varies markedly among theC. fasciculata cells. The wild and FUR11 mutant strains displayed lower negative surface charge (−12.5 and −9.5 mV, respectively), as compared with the TR3 (−14.8 mV) and TFRR1 (−14.7 mV) mutant strains. Binding of cationized ferritin (CF) was observed at the cell surface of wild and mutant strains ofC. fasciculata. Neuraminidase treatment reduced the negative surface charge in the TFRR1 and TR3 mutants in about 37 and 29%, respectively, whereas no significant change was observed with the wild and FUR11 mutant strains. These findings suggest that sialic acid residues are the major anionogenic groups on the surface ofC. fasciculata. The density of sialic acid residues per cell in wild and mutant strains ofC. fasciculata falls in a range of 1.4×104 to 3.6×104. Marked differences of hydrophobicity were also observed. For example, the TFRR1, FUR11, and TR3 drug-resistant mutant strains showed higher contact angle values (55.4, 54.2, and 49.3, respectively) than the wild-type (35.6), as assessed by α-bromonaphtalene.

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Authors and Affiliations

  1. Instituto de Microbiologia Centro de Ciências da Saúde, Universidade Federal do Rio de Janeiro, Ilha do Fundão, 21941, Rio de Janeiro, RJ, Brazil

    Maria Adelaide do Valle Matta, Celuta Sales Alviano, Jayme Angluster & Manuel José Gil Esteves

  2. Instituto de Biofisica Carlos Chagas Filho, Centro de Ciências da Saúde, Universidade Federal do Rio de Janeiro, Ilha do Fundão, 21941, Rio de Janeiro, RJ, Brazil

    Wanderley de Souza & Fernando Costa e Silva-Filho

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  1. Maria Adelaide do Valle Matta
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  2. Celuta Sales Alviano
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  4. Wanderley de Souza
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  5. Fernando Costa e Silva-Filho
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  6. Manuel José Gil Esteves
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do Valle Matta, M.A., Alviano, C.S., Angluster, J. et al. Surface charge and hydrophobicity of wild and mutantCrithidia fasciculata . Cell Biochem Biophys 20, 69–79 (1992). https://doi.org/10.1007/BF02782655

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