Abstract
Blood stages of Plasmodium vivax induce the development of caveolae and caveola–vesicle complexes (CVC) in the membrane of their host erythrocyte. Caveolae are found in almost all types of cells and are involved in endogenous processes as calcium and cholesterol homeostasis, cell signalling, transporting, ligand internalization and transcytosis of serum components. Major structural components of caveolae are the proteins caveolins and flotillins. The functional role of caveolae in the P. vivax-infected erythrocyte is not properly understood. As these organelles have been shown to contain malaria antigens, it has been suggested that they are involved in the transport and release of specific parasite antigens from the infected erythrocyte and in the uptake of plasma proteins. Using specific antibodies to classical caveolae proteins and an immunolocalization approach, we found caveolin-2, caveolin-3, and flotillin-2 in the vesicle profiles and some CVC of P. vivax-infected erythrocytes. Caveolin-1–3 were not found in uninfected erythrocytes. This is the first report of identification and localization of caveolins in the CVC present in erythrocytes infected with P. vivax, thereby providing evidence of the role of this particular organelle in the protein-trafficking pathway that connect parasite-encoded proteins with the erythrocyte cytoplasm and the cell surface throughout the asexual blood cycle of vivax malaria parasite.
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Acknowledgements
Thanks to the personnel of the Malaria Diagnostic Centres sponsored by the Ministry of Health and Social Development in Puerto Ayacucho, Amazonas State (Zone XX) and Caracas (Zone X) for the valuable help with the field collection of human blood samples infected with P. vivax. This research received financial support from FONACIT (grants S1-2000000633 and F-2000001531), the “Centre National de la Recherche Scientific” (CNRS, France), and ECOS-NORD-FONACIT (Grant V04S02-PI-2003000313). We assure that the experiments presented in this paper comply with the current laws of Venezuela and France.
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Bracho, C., Dunia, I., Romano, M. et al. Caveolins and flotillin-2 are present in the blood stages of Plasmodium vivax . Parasitol Res 99, 153–159 (2006). https://doi.org/10.1007/s00436-006-0139-6
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DOI: https://doi.org/10.1007/s00436-006-0139-6