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Effects of protein kinase inhibitors on the in vitro growth of Babesia bovis

Published online by Cambridge University Press:  24 February 2006

S. BORK ,
S. DAS ,
K. OKUBO ,
N. YOKOYAMA  and
I. IGARASHI
S. BORK
Affiliation:
National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-cho, Obihiro, Hokkaido 080-8555, Japan
S. DAS
Affiliation:
National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-cho, Obihiro, Hokkaido 080-8555, Japan Institute of Animal Health and Veterinary Biologicals, Animal Research Development Department, Kolkata, Government of West Bengal, India
K. OKUBO
Affiliation:
National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-cho, Obihiro, Hokkaido 080-8555, Japan
N. YOKOYAMA
Affiliation:
National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-cho, Obihiro, Hokkaido 080-8555, Japan
I. IGARASHI
Affiliation:
National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada-cho, Obihiro, Hokkaido 080-8555, Japan
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Abstract

Staurosporine, Ro-31-7549, and KN-93, which are inhibitors of serine/threonine protein kinase, protein kinase C, and calcium-modulin kinase, respectively, were tested for their effects on the in vitro growth of Babesia bovis. Staurosporine was the most effective inhibitor, completely clearing the parasitaemia as early as the first day of exposure at a concentration of 100 μM. Moreover, staurosporine caused a significant increase in the percentage of extracellular merozoites, most likely due to the inhibition of erythrocyte invasion by the parasite. Although 5 mM Ro-31-7549 and KN-93 had a suppressive action, this was not enough to destroy the parasite. Interestingly, concentrations of 0·5 to 5 mM KN-93 influenced the parasitic development within the infected erythrocytes. The present study suggests that B. bovis requires, to a certain extent, the phosphorylations mediated by parasite- or host erythrocyte-protein kinases, in particular, for the processes of successful invasion of erythrocytes and intraerythrocytic development.

Keywords

staurosporineRo-31-7549KN-93Babesia bovisin vitro cultivation
Type
Research Article
Information
Parasitology , Volume 132 , Issue 6 , June 2006 , pp. 775 - 779
Copyright
2006 Cambridge University Press

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