WEKO3
アイテム
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Immediately after weaning, most lactation-related genes are downregulated and milk production ceases. In our previous study, we have detected an inwardly rectifying potassium channel (Kir) 2.1-like current in mammary secretory (MS) cells freshly isolated from lactating mice. This current is highly sensitive to external Ba2+ . The potassium permeability of the Kir channels may contribute to the secretion and/or preservation of ions in milk. We hypothesized that the functions of the Kir channels in MS cells are regulated after weaning. To test this hypothesis, we examined the effect of forced weaning on the Ba2+ -sensitive Kir current and Kir2.1 expression in the mouse mammary glands. Twenty-four hours after weaning, the lumina of mammary acini were histologically enlarged by milk accumulation. The whole-cell patch-clamp analyses showed that the Ba2+ -sensitive Kir current in the post-weaning MS cells was smaller than in the lactating MS cells. The inward conductances of the current in the lactating and post-weaning cells were 4.25 ± 0.77 and 0.93 ± 0.34 nS, respectively. Furthermore, real-time PCR and Western blot analyses showed that Kir2.1 mRNA and protein expression decreased in the post-weaning mammary gland (mRNA, 90% reduction; protein, 47% reduction). Moreover, the local milk accumulation caused by teat sealing decreased Kir conductance in MS cells (2.74 ± 0.45 and 0.36 ± 0.27 nS for control and sealed mammary glands, respectively). This was concomitant with the reduction in the Kir2.1 mRNA expression. Our results suggest that milk stasis after weaning immediately decreases the Kir conductance in MS cells. This decrease in the Kir conductance may be partly caused by the reduction in the Kir2.1 mRNA and protein expression. 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Decrease in an inwardly rectifying potassium conductance in mouse mammary secretory cells after forced weaning
https://obihiro.repo.nii.ac.jp/records/4459
https://obihiro.repo.nii.ac.jp/records/445902986c6f-823a-465b-8804-0fa3d9bfc457
名前 / ファイル | ライセンス | アクション |
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fultext (4.6 MB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||||||||||
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公開日 | 2019-10-25 | |||||||||||||
タイトル | ||||||||||||||
言語 | en | |||||||||||||
タイトル | Decrease in an inwardly rectifying potassium conductance in mouse mammary secretory cells after forced weaning | |||||||||||||
言語 | ||||||||||||||
言語 | eng | |||||||||||||
資源タイプ | ||||||||||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||||||||||
資源タイプ | journal article | |||||||||||||
著者 |
上川, 昭博
× 上川, 昭博
WEKO
74
× Sugimoto, Shota× Ichii, Osamu× 近藤, 大輔
WEKO
329
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抄録 | ||||||||||||||
内容記述タイプ | Abstract | |||||||||||||
内容記述 | Mammary glands are physiologically active in female mammals only during nursing. Immediately after weaning, most lactation-related genes are downregulated and milk production ceases. In our previous study, we have detected an inwardly rectifying potassium channel (Kir) 2.1-like current in mammary secretory (MS) cells freshly isolated from lactating mice. This current is highly sensitive to external Ba2+ . The potassium permeability of the Kir channels may contribute to the secretion and/or preservation of ions in milk. We hypothesized that the functions of the Kir channels in MS cells are regulated after weaning. To test this hypothesis, we examined the effect of forced weaning on the Ba2+ -sensitive Kir current and Kir2.1 expression in the mouse mammary glands. Twenty-four hours after weaning, the lumina of mammary acini were histologically enlarged by milk accumulation. The whole-cell patch-clamp analyses showed that the Ba2+ -sensitive Kir current in the post-weaning MS cells was smaller than in the lactating MS cells. The inward conductances of the current in the lactating and post-weaning cells were 4.25 ± 0.77 and 0.93 ± 0.34 nS, respectively. Furthermore, real-time PCR and Western blot analyses showed that Kir2.1 mRNA and protein expression decreased in the post-weaning mammary gland (mRNA, 90% reduction; protein, 47% reduction). Moreover, the local milk accumulation caused by teat sealing decreased Kir conductance in MS cells (2.74 ± 0.45 and 0.36 ± 0.27 nS for control and sealed mammary glands, respectively). This was concomitant with the reduction in the Kir2.1 mRNA expression. Our results suggest that milk stasis after weaning immediately decreases the Kir conductance in MS cells. This decrease in the Kir conductance may be partly caused by the reduction in the Kir2.1 mRNA and protein expression. These alterations during the post-weaning period may be involved in the cessation of ion secretion and/or preservation in the milk. | |||||||||||||
言語 | en | |||||||||||||
書誌情報 |
en : PLoS ONE 巻 10, 号 10, p. e0141131, 発行日 2015 |
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出版者 | ||||||||||||||
言語 | en | |||||||||||||
出版者 | Public Library of Science | |||||||||||||
ISSN | ||||||||||||||
収録物識別子タイプ | PISSN | |||||||||||||
収録物識別子 | 19326203 | |||||||||||||
DOI | ||||||||||||||
関連タイプ | isIdenticalTo | |||||||||||||
識別子タイプ | DOI | |||||||||||||
関連識別子 | info:doi/10.1371/journal.pone.0141131 | |||||||||||||
権利 | ||||||||||||||
言語 | en | |||||||||||||
権利情報 | This is an open access article licensed under the terms of the Creative Commons Attribution (by) License. <http://creativecommons.org/lisenses/by/4.0/> | |||||||||||||
フォーマット | ||||||||||||||
内容記述タイプ | Other | |||||||||||||
内容記述 | application/pdf | |||||||||||||
著者版フラグ | ||||||||||||||
出版タイプ | VoR | |||||||||||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||||||||||
日本十進分類法 | ||||||||||||||
主題Scheme | NDC | |||||||||||||
主題 | 649 |