title: First description of an in vitro culture system for Eimeria ovinoidalis macromeront formation in primary host endothelial cells.
abstract: The apicomplexan parasite Eimeria ovinoidalis is distributed worldwide and causes clinical ovine coccidiosis. As one of the most pathogenic species in sheep, the principal clinical sign is profuse diarrhoea in young animals, which leads to important economic losses in the ovine industry. We here aimed to establish an in vitro culture system for the development of E. ovinoidalis macromeronts, as no suitable systems are currently available for any ovine Eimeria species. Faecal samples containing more than 90% of E. ovinoidalis oocysts were collected from naturally infected lambs and ewes in Murcia Region (Spain). E. ovinoidalis oocysts were collected, left to sporulate in potassium dichromate and stored at 4°C until further studies were conducted. Moreover, a suitable excystation protocol was effectively established, resulting in the release of viable sporozoites, which were allowed to infect primary bovine umbilical vein endothelial cells (BUVEC) and permanent bovine colonic epithelial cells (BCEC). In vitro first merogony was successfully accomplished exclusively in BUVEC leading to macromeront formation (up to 100μm) and the release of fully developed and viable merozoites I stages. Given that we were able to establish a suitable in vitro system for the first merogony of such pathogenic Eimeria species in sheep, advances might be further made not only on studies regarding the control of ovine coccidiosis, such as drug screenings, but also on the better understanding of molecular parasite-host cell interactions as already demonstrated for other ruminant Eimeria species.
authors.affiliation: Institute of Parasitology, Justus Liebig University Giessen, BFS, Schubertstr. 81, 35392 Giessen, Germany; Parasitología, Departamento de Sanidad Animal, Facultad de Veterinaria, Campus de Excelencia Internacional Regional "Campus Mare Nostrum", Universidad de Murcia, 30100 Espinardo, Murcia, Spain.
authors.forename: Tessa
authors.initials: T
authors.lastname: Carrau
authors.affiliation: Institute of Parasitology, Justus Liebig University Giessen, BFS, Schubertstr. 81, 35392 Giessen, Germany. Electronic address: Liliana.Silva@vetmed.uni-giessen.de.
authors.forename: Liliana Machado Ribeiro
authors.initials: LM
authors.lastname: Silva
authors.affiliation: Parasitología, Departamento de Sanidad Animal, Facultad de Veterinaria, Campus de Excelencia Internacional Regional "Campus Mare Nostrum", Universidad de Murcia, 30100 Espinardo, Murcia, Spain.
authors.forename: David
authors.initials: D
authors.lastname: Pérez
authors.affiliation: Parasitología, Departamento de Sanidad Animal, Facultad de Veterinaria, Campus de Excelencia Internacional Regional "Campus Mare Nostrum", Universidad de Murcia, 30100 Espinardo, Murcia, Spain.
authors.forename: Rocio
authors.initials: R
authors.lastname: Ruiz de Ybáñez
authors.affiliation: Institute of Parasitology, Justus Liebig University Giessen, BFS, Schubertstr. 81, 35392 Giessen, Germany.
authors.forename: Anja
authors.initials: A
authors.lastname: Taubert
authors.affiliation: Institute of Parasitology, Justus Liebig University Giessen, BFS, Schubertstr. 81, 35392 Giessen, Germany.
authors.forename: Carlos
authors.initials: C
authors.lastname: Hermosilla
keywords: BUVEC; Eimeria ovinoidalis; First merogony; In vitro culture system; Ovine