Leishmania (Viannia) braziliensis nucleoside triphosphate diphosphohydrolase (NTPDase 1): Localization and in vitro inhibition of promastigotes growth by polyclonal antibodies

• Autor(a) principal: Porcino, Gabriane Nascimento
• Data de Publicação: 2012
• Outros Autores: Carvalho-Campos, Cristiane, Ribeiro Gomes Maia, Ana Carolina, Detoni, Michelle Lima, Faria-Pinto, Priscila, Coimbra, Elaine Soares, Marques, Marcos Jose, Juliano, Maria Aparecida [UNIFESP], Juliano, Luiz [UNIFESP], Diniz, Vanessa Alvaro, Corte-Real, Suzana, Vasconcelos, Eveline Gomes
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNIFESP
• Texto Completo: http://dx.doi.org/10.1016/j.exppara.2012.08.009; http://repositorio.unifesp.br/handle/11600/35295
• topic: Apyrase; ATP diphosphohydrolase; NTPase; Peptide; Leishmaniasis; Immunocytochemical

Nucleoside triphosphate diphosphohydrolase (NTPDase) activity was recently characterized in Leishmania (Viannia) braziliensis promastigotes (Lb), and an antigenic conserved domain (r82-121) from the specific NTPDase 1 isoform was identified. in this work, mouse polyclonal antibodies produced against two synthetic peptides derived from this domain (LbB1LJ, r82-103; LbB2LJ, r102-121) were used. the anti-LbB1LJ or anti-LbB2LJ antibodies were immobilized on protein A-sepharose and immunoprecipitated the NTPDase 1 of 48 kDa and depleted approximately 40% of the phosphohydrolytic activity from detergent-homogenized Lb preparation. Ultrastructural immunocytochemical microscopy identified the NTPDase 1 on the parasite surface and in its subcellular cytoplasmic vesicles, mitochondria, kinetoplast and nucleus. the ATPase and ADPase activities of detergent-homogenized Lb preparation were partially inhibited by anti-LbB1LJ antibody (43-79%), which was more effective than that inhibition (18-47%) by anti-LbB2LJ antibody. in addition, the immune serum anti-LbB1LJ (67%) or anti-LbB2LJ (33%) was cytotoxic, significantly reducing the promastigotes growth in vitro. the results appoint the conserved domain from the L braziliensis NTPDase as an important target for inhibitor design and the potential application of these biomolecules in experimental protocols of disease control. (c) 2012 Elsevier Inc. All rights reserved.