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Del Collado M, da Silveira JC, Sangalli JR, Andrade GM, Sousa LRDS, Silva LA, Meirelles FV, Perecin F. Fatty Acid Binding Protein 3 And Transzonal Projections Are Involved In Lipid Accumulation During In Vitro Maturation Of Bovine Oocytes. Sci Rep 2017; 7:2645. [PMID: 28572619 PMCID: PMC5453981 DOI: 10.1038/s41598-017-02467-9] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Accepted: 04/11/2017] [Indexed: 12/20/2022] Open
Abstract
Oocytes that undergo in vitro maturation (IVM) are metabolically abnormal and accumulate excess lipid content. However, the mechanism of lipid accumulation and the role of cumulus cells in this process are unclear. Recently, it was shown that fatty acid binding proteins (FABPs) performed intra- and extracellular fatty acid transport. We postulated that FABP3 might be responsible for fatty acid transport from cumulus cells to the oocytes via transzonal projections (TZPs) during IVM. Transcript and protein levels of FABP3 were analyzed in both in vivo- and in vitro-matured cumulus-oocyte-complexes and were increased in IVM samples. Further analysis showed increased lipid content in oocytes and cumulus cells in IVM samples compared to in vivo-derived. We therefore speculated that altered traffic of fatty acids via FABP3 during IVM was the mechanism leading to the excess of lipids accumulated within IVM oocytes. Furthermore, we demonstrated an increase in FABP3 levels and lipid content during the first 9 h of IVM, further strengthening the possibility of fatty acid transport via FABP3 and TZPs. Additionally, disruptions of TZPs during IVM decreased lipid accumulation in oocytes. Our results shed light on a possible mechanism involving FABP3 and TZPs that causes excess lipid accumulation in oocytes during IVM.
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Affiliation(s)
- Maite Del Collado
- Veterinary Medicine Department, Faculty of Animal Sciences and Food Engineering, University of Sao Paulo, Av. Duque de Caxias Norte 225, 13635-900, Pirassununga, SP, Brazil
| | - Juliano Coelho da Silveira
- Veterinary Medicine Department, Faculty of Animal Sciences and Food Engineering, University of Sao Paulo, Av. Duque de Caxias Norte 225, 13635-900, Pirassununga, SP, Brazil
| | - Juliano Rodrigues Sangalli
- Veterinary Medicine Department, Faculty of Animal Sciences and Food Engineering, University of Sao Paulo, Av. Duque de Caxias Norte 225, 13635-900, Pirassununga, SP, Brazil
| | - Gabriella Mamede Andrade
- Veterinary Medicine Department, Faculty of Animal Sciences and Food Engineering, University of Sao Paulo, Av. Duque de Caxias Norte 225, 13635-900, Pirassununga, SP, Brazil
| | - Letícia Rabello da Silva Sousa
- Veterinary Medicine Department, Faculty of Animal Sciences and Food Engineering, University of Sao Paulo, Av. Duque de Caxias Norte 225, 13635-900, Pirassununga, SP, Brazil
| | - Luciano Andrade Silva
- Veterinary Medicine Department, Faculty of Animal Sciences and Food Engineering, University of Sao Paulo, Av. Duque de Caxias Norte 225, 13635-900, Pirassununga, SP, Brazil
| | - Flavio Vieira Meirelles
- Veterinary Medicine Department, Faculty of Animal Sciences and Food Engineering, University of Sao Paulo, Av. Duque de Caxias Norte 225, 13635-900, Pirassununga, SP, Brazil
| | - Felipe Perecin
- Veterinary Medicine Department, Faculty of Animal Sciences and Food Engineering, University of Sao Paulo, Av. Duque de Caxias Norte 225, 13635-900, Pirassununga, SP, Brazil.
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