Efeito do estresse subletal com a utilização de LED no desenvolvimento e na qualidade de embriões bovinos produzidos in vitro

• Ano de defesa: 2014
• Autor(a) principal: Perez, Luis Eduardo Vergara [UNESP]
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Embrião; Stress oxidativo; Celulas - Proliferação; Celulas - Crescimento; Apoptose; Fertilização in vitro; Biotecnologia de célula animal; Cells Growth
• Link de acesso: http://hdl.handle.net/11449/110629

The in vitro embryo culture system has lower efficiency compared to in vivo, because the in vitro system is characterized by lower rates of development, deployment, and a lower tolerance to certain changes that cause stress, such as physical, chemical, thermal, osmotic, oxidative and radioactive among others. According to the stress intensity it is possible to stimulate a cellular response promoting embryonic development and acquiring greater tolerance by the acceleration of metabolism, cell proliferation and growth. The objective of this study was to analyze the effect of the optical stress at different periods throughout the embryo development and understand the possible applications for this stimulation, from sublethal stress and biostimulation promoted by irradiation with lasers. Therefore, the results showed that optical stress can be beneficial to the embryos at certain stages of their development, such as blastocysts stage, protecting them from apoptosis. The main results show that an increase in blastocysts production for infrared irradiated groups, although there was no statistical difference (control 23.2; IRD3inf 31.3; IRD6Inf 33.3). The infrared LED stimulus prior to vitrification showed a higher number of cells for embryos in D3 (control: 91.9; IRD3inf: 112.8). Also, infrared irradiation appeared to decrease the number of apoptotics cells, when compared to controls (control: 11.6; IRD6inf: 6.6; IRFIVinf: 7.8), and red light irradiation appeared to increase apoptosis (IRD3verm: 15.6; IRD6verm: 16.1). Regarding re-expansion rate, the red light irradiation in D3 is related a significant decrease in the rate (control: 70.5; IRD3verm: 39.3). According to the results, irradiation with infrared light effect is shown in blastocyst production, which is economically important to embryos IVP. Moreover, the apoptosis analysis showed that the association between the techniques applied in this study are important for the in ...