title: The heat shock protein 90 of Eimeria tenella is essential for invasion of host cell and schizont growth.
abstract: The 90-kDa heat shock proteins (Hsp90) are important for stress tolerance, for newly synthesised protein folding and for the growth of various organisms. Participation of Hsp90 in the development of Apicomplexa, notably in Plasmodium falciparum and Toxoplasma gondii, has been proven. In this work, the importance of Hsp90 for Eimeria tenella, which is responsible for avian caecal coccidiosis, was studied. Our results show that E. tenella Hsp90 (EtHsp90) expression increases during infection. Immunofluorescence microscopy studies reveal a dispersed localisation of EtHsp90 during the first schizogony. Moreover, EtHsp90 is secreted by sporozoites as early as 5min after addition of FCS in a temperature-dependent manner. By using staurosporine, we invalidated the hypothesis that EtHsp90 might be a micronemal protein. Then, EtHsp90 was detected in a parasitophorous vacuole membrane. This result suggests the importance of EtHsp90 for intracellular growth of the parasite. Inhibition of EtHsp90 function using specific antibodies and geldanamicin attenuates the capacity of E. tenella to invade and grow in the host cell.
authors.affiliation: Département de Biologie, Université de Versailles Saint-Quentin-en-Yvelines, 78035 Versailles, France.
authors.forename: Marylène
authors.initials: M
authors.lastname: Péroval
authors.forename: Pierre
authors.initials: P
authors.lastname: Péry
authors.forename: Marie
authors.initials: M
authors.lastname: Labbé
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D003001:Cloning, Molecular; D003048:Coccidiosis / Q000378:metabolism / Q000635:transmission*; D016786:Eimeria tenella / Q000502:physiology*; D018841:HSP90 Heat-Shock Proteins / Q000032:analysis / Q000235:genetics / Q000502:physiology*; D006790:Host-Parasite Interactions; D015151:Immunoblotting; D047468:Immunoprecipitation; D007425:Intracellular Membranes / Q000378:metabolism; D008856:Microscopy, Fluorescence; D008969:Molecular Sequence Data; D010274:Parasitology / Q000379:methods; D011201:Poultry Diseases / Q000378:metabolism / Q000635:transmission*; D015800:Protozoan Proteins / Q000235:genetics; D014617:Vacuoles
chemical_list: D018841:HSP90 Heat-Shock Proteins; D015800:Protozoan Proteins