| Autor: |
de Almeida-Amaral EE; Laboratório de Bioquímica Celular, Instituto de Bioquímica Médica, Universidade Federal do Rio de Janeiro, CCS, Bloco H sala H2-013, Cidade Universitária, Ilha do Fundão, 21941-590, Rio de Janeiro, RJ, Brazil., Caruso-Neves C, Pires VM, Meyer-Fernandes JR |
| Jazyk: |
angličtina |
| Zdroj: |
Experimental parasitology [Exp Parasitol] 2008 Feb; Vol. 118 (2), pp. 165-71. Date of Electronic Publication: 2007 Aug 03. |
| DOI: |
10.1016/j.exppara.2007.07.001 |
| Abstrakt: |
We characterized ouabain-insensitive Na+-ATPase activity present in the plasma membrane of Leishmania amazonensis and investigated its possible role in the growth of the parasite. An increase in Na+ concentration in the presence of 1mM ouabain, increased the ATPase activity with a V(max) of 154.1+/-13.5nmol Pi x h(-1) x mg(-1) and a K0.5 of 28.9+/-7.7mM. Furosemide and sodium orthovanadate inhibited the Na+-stimulated ATPase activity with an IC(50) of 270microM and 0.10microM, respectively. Furosemide inhibited the growth of L. amazonensis after 48h incubation, with maximal effect after 96h. The IC50 for furosemide was 840. On the other hand, ouabain (1mM) did not change the growth of the parasite. Taken together, these results show that L. amazonensis expresses a P-type, ouabain-insensitive Na+-ATPase that could be involved with the growth of the parasite. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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