Prepartum Maternal Plasma Glucose Concentrations and Placental Glucose Transporter mRNA Expression in Cows Carrying Somatic Cell Clone Fetuses
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- HIRAYAMA Hiroki
- Animal Research Center, Hokkaido Research Organization
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- SAWAI Ken
- Department of Animal Science, Faculty of Agriculture, Iwate University
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- HIRAYAMA Muneyuki
- National Livestock Breeding Center
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- HIRAI Tomokazu
- National Livestock Breeding Center Tokachi Station
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- KAGEYAMA Soichi
- Animal Research Center, Hokkaido Research Organization
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- ONOE Sadao
- Animal Research Center, Hokkaido Research Organization
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- MINAMIHASHI Akira
- Animal Research Center, Hokkaido Research Organization
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- MORIYASU Satoru
- Animal Research Center, Hokkaido Research Organization
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In this study, the plasma glucose concentrations of cows carrying a somatic cell clone fetus during late pregnancy and placental glucose transporter (GLUT) mRNA levels at parturition were examined. Parturition was induced using dexamethasone, prostaglandin F2α and estriol in cows bearing a clone (Clone) or a fetus fertilized in vivo as a control (DEX). Plasma glucose concentrations were measured in the cows (days 257 and 271 of pregnancy and at parturition) and newborn calves. Cotyledon and caruncle tissues removed just after parturition were used for mRNA extraction. Expression of mRNA was also analyzed in control cows that were induced to undergo parturition without dexamethasone (PG) or that spontaneously delivered (SP). The glucose concentrations of the Clone group were significantly low at all points examined, but those of the calves were normal. The increase in the maternal glucose concentration from day 257 to parturition was significantly lower in the Clone group. Glucose concentrations were negatively correlated with birth weight for clones (day 257; r=-0.584, day 271; r=-0.286, parturition; r=-0.549). There was no difference in mRNA levels in the cotyledons among the animals examined. In the caruncles, the Clone and PG groups showed significantly higher GLUT1 and GLUT3 mRNA levels than the SP group, and the GLUT3 mRNA level was significantly higher in the Clone group than in the DEX group. The glucocorticoid receptor α mRNA level was significantly lower in the SP group than in the DEX group. Although spontaneous parturition and administration of dexamethasone suppressed the placental GLUT mRNA levels, the action was not observed in clone pregnancy. These results raise the possibility of facilitation of glucose transportation through the placenta to meet increased nutritional requirements of overgrown clone fetuses.<br>
収録刊行物
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- Journal of Reproduction and Development
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Journal of Reproduction and Development 57 (1), 57-61, 2011
公益社団法人 日本繁殖生物学会
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詳細情報 詳細情報について
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- CRID
- 1390282681314480896
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- NII論文ID
- 10027901088
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- NII書誌ID
- AA10936678
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- ISSN
- 13484400
- 09168818
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- NDL書誌ID
- 10991590
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可