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• W2087730658 abstract "Due to the distance from the laboratory to the recipient farm, several laboratories, including ours, carry somatic cell nuclear transfer (SCNT)-derived porcine embryos to the farm using a portable incubator for a few hours. If the embryos are nourished well during the transport, viability of embryos might be increased and cloning efficiency can be improved. TALP, which is widely used as a porcine embryo transport medium, lacks amino acids (AA). Proper supply of AA in the uterus is important for the development of pre-implantation embryos because AA have functions as osmolytes, metabolic regulators, or substrates and buffers of intracellular pH. Thus, supplementation of AA could affect the embryonic viability during the transport of SCNT-derived porcine embryos. The aim of this study is to determine whether the transport medium containing AAs affects the in vitro development of parthenogenetic embryos compared to TALP. Porcine zygote medium-5 (PZM-5) was chosen as transport medium containing AA due to its similarity in constituents with TALP except for the AA. Because PZM-5 contains sodium bicarbonate as a buffer system which can not cover wide variation of pH, 10 mM HEPES was added into PZM-5 (PZM+H) as it was normally done with TALP. Porcine cumulus–oocyte complexes (COC) were collected from ovaries of slaughtered pigs and cultured for 44 h using a two-step culture protocol. After denuded, matured oocytes were activated by thimerosal for 10 min followed by dithiothreitol for 30 min. The parthenogenetic embryos were cultured in PZM-5 for 2 days, monitored for cleavage, and loaded in a straw with TALP or PZM+H, respectively. Embryos were stored in a portable incubator (MTG, Bruckberg, Germany; no CO2) at 37°C for three hours and moved to PZM-5 drop for additional 5 days culture. The development was monitored on Day 7 after activation and blastocysts (BL) were collected for total cell number counts and RNA extraction. Ten BL from the TALP group and 11 BL from the PZM+H group were stained with 10 µg mL–1 bisbenzimide (Hoechst 33342) and were visualized for cell counting under fluorescence microscopy. Messenger RNA was extracted from 7 BL of the TALP and PZM+H groups and cDNA were synthesized. Quantitative real-time PCR were done to detect expression levels of apoptosis-related genes using the cDNA. The Bax/Bcl2 ratio was investigated as expression level of apoptosis-related genes and GAPDH was used as control. Each experiment was repeated at least 3 times. Data were analyzed by paired Student’s t-test using Graphpad Prism (version 5, Graphpad Software Inc., La Jolla, CA, USA). No difference was observed between the TALP and PZM+H groups with respect to blastocyst formation rate (22.46 ± 1.47% and 23.17 ± 2.13%, respectively) and total cell number (32.9 ± 2.22 and 37.09 ± 2.18, respectively). There was no significant difference between groups in the Bax/Bcl2 ratio. The use of PZM-5 media, which contains AA, did not affect the development and apoptosis of parthenogenetic embryos. This study was supported by MKE (#10033839-2012-21), IPET (#311011-05-1-SB010), the Research Institute for Veterinary Science, and TS Corporation." @default.
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• W2087730658 date "2013-01-01" @default.
• W2087730658 modified "2023-09-27" @default.
• W2087730658 title "158 EFFECTS OF AMINO ACIDS IN EMBRYO TRANSPORT MEDIA ON PORCINE EMBRYOS" @default.
• W2087730658 doi "https://doi.org/10.1071/rdv25n1ab158" @default.
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