Event Abstract Back to Event The probiotic Lactobacillus rhamnosus, increase fecundity in Danio rerio Oliana Carnevali1* and Giorgia Gioacchini1 1 Polytechnic University of Marche, Department of Marine Sciences, Italy In this study, the effects of ten days treatment with the probiotic Lactobacillus rhamnosus IMC 501, as feed additive, were examined on zebrafish, Danio rerio, ovarian follicle maturation and ovulation. The stimulating role of probiotic on follicles maturation and ovulation process was indicated by the higher number of ovulated eggs in vivo and by the higher GVBD rate obtained by the in vitro maturation assay. The stimulation of oocyte maturation was associated with the increase of LH receptor (LHR), the 20β-hydroxysteroid dehydrogenase (20β-HSD), the CyclinB and the isoform β of the membrane receptor for the Progesterone (mPRβ). Concomitantly, the transcription decrease of genes codifying for local factors preventing oocyte maturation like transforming growth factorβ1 (TGFβ1), growth and differentiation factor9 (GDF9) and bone morphogenetic proteins15 (BMP15), was evidenced. In addition, the cyclooxygenase2A (Cox2A) gene expression, an enzyme involved in prostaglandin biosynthesis, was significantly induced by the probiotic administration. Concurrently, the embryos vitality was significantly improved in embryo from L. rhamnosus treated females. The stimulatory role of L. rhamnosus in zebrafish follicle maturation, fecundity and egg quality, evidenced in this study indicated the great potency of this feed additive on ovarian physiology and embryo development evidencing the high potentiality of this probiotic on reproduction process improvement. Keywords: comparative endocrinology Conference: 25th Conference of the European Comparative Endocrinologists, Pécs, Hungary, 31 Aug - 4 Sep, 2010. Presentation Type: Conference Presentation Topic: Comparative endocrinology Citation: Carnevali O and Gioacchini G (2010). The probiotic Lactobacillus rhamnosus, increase fecundity in Danio rerio. Front. Endocrinol. Conference Abstract: 25th Conference of the European Comparative Endocrinologists. doi: 10.3389/conf.fendo.2010.01.00018 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 26 Aug 2010; Published Online: 29 Aug 2010. * Correspondence: Dr. Oliana Carnevali, Polytechnic University of Marche, Department of Marine Sciences, Ancona, Italy, o.carnevali@univpm.it Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Oliana Carnevali Giorgia Gioacchini Google Oliana Carnevali Giorgia Gioacchini Google Scholar Oliana Carnevali Giorgia Gioacchini PubMed Oliana Carnevali Giorgia Gioacchini Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page.