| Autor: |
Yokoyama, Naoaki, Suthisak, Boonchit, Hirata, Haruyuki, Matsuo, Tomohide, Inoue, Noboru, Sugimoto, Chihiro, Igarashi, Ikuo |
| Zdroj: |
Infection and Immunity; October 2002, Vol. 70 Issue: 10 p5822-5826, 5p |
| Abstrakt: |
ABSTRACTThe cellular localization of Babesia bovisrhoptry-associated protein 1 (RAP-1) and its erythrocyte-binding affinity were examined with anti-RAP-1 antibodies. In an indirect immunofluorescent antibody test, RAP-1 was detectable in all developmental stages of merozoites and in extracellular merozoites. In the early stage of merozoite development, RAP-1 appears as a dense accumulation, which later thins out and blankets the host cell cytoplasm, but retains a denser mass around newly formed parasite nuclei. The preferential accumulations of RAP-1 on the inner surface of a host cell membrane and bordering the parasite's outer surface were demonstrable by immunoelectron microscopy. An erythrocyte-binding assay with the lysate of merozoites demonstrated RAP-1 binding to both bovine and equine erythrocytes. Anti-RAP-1 monoclonal antibody 1C1 prevented the interaction of RAP-1 with bovine erythrocytes and significantly inhibited parasite proliferation in vitro. With the recombinant RAP-1, the addition of increasing concentrations of Ca2+accentuated its binding affinity with bovine erythrocytes. The present findings lend support to an earlier proposition of an erythrocytic binding role for RAP-1 expressed in B. bovismerozoites and, possibly, its involvement in the escape of newly formed merozoites from host cells. |
| Databáze: |
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