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During merogony, <jats:italic>N. caninum<\/jats:italic> tachyzoites invade and proliferate in host cells in vivo, including endothelial cells of lymphatic and blood vessels. The egress at the end of the lytic cycle is tightly regulated in apicomplexans. Evidence in <jats:italic>Toxoplasma gondii<\/jats:italic> shows that Ca<jats:sup>++<\/jats:sup> signalling governs tachyzoite egress. Much less is known on egress mechanisms of <jats:italic>N. caninum<\/jats:italic>. Here, we show, using 3D live cell holotomographic microscopy in fluo-4 AM-loaded <jats:italic>N. caninum<\/jats:italic>-infected BUVEC, that treatments with the calcium ionophore A23187 at 24- and 42-h post-infection (h p. i.) induced a fast and sustained increase in Ca<jats:sup>++<\/jats:sup> signals in parallel to tachyzoite egress. A23187 treatments exclusively triggered tachyzoite release at 42-h p. i. but failed to do so at 24-h p. i. indicating a role for meront maturation in calcium-induced tachyzoite egress. Overall, we show that live cell 3D holotomographic analysis in combination with epifluorescence is a suitable tool to study calcium dynamics related to coccidian egress or other important cell functions.<\/jats:p>","DOI":"10.1007\/s00436-021-07260-2","type":"journal-article","created":{"date-parts":[[2021,8,13]],"date-time":"2021-08-13T03:34:09Z","timestamp":1628825649000},"page":"1169-1177","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["3D holotomographic monitoring of Ca++ dynamics during ionophore-induced Neospora caninum tachyzoite egress from primary bovine host endothelial cells"],"prefix":"10.1007","volume":"121","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6232-0366","authenticated-orcid":false,"given":"C.","family":"Larrazabal","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"C.","family":"Hermosilla","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A.","family":"Taubert","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"I.","family":"Conejeros","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2021,8,13]]},"reference":[{"key":"7260_CR1","doi-asserted-by":"publisher","first-page":"1975","DOI":"10.1016\/j.bpj.2017.02.035","volume":"112","author":"EL Ardiel","year":"2017","unstructured":"Ardiel EL, Kumar A, Marbach J, Christensen R, Gupta R, Duncan W, Daniels JS, Stuurman N, Col\u00f3n-Ramos D, Shroff H (2017) Visualizing calcium flux in freely moving nematode embryos. 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