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• W2257401992 abstract "The zinc transporter ZnT2 (SLC30A2) imports zinc into vesicles in secreting mammary epithelial cells (MECs) and is critical for zinc efflux into milk during lactation. Recent studies show that ZnT2 also imports zinc into mitochondria and is expressed in the non-lactating mammary gland and non-secreting MECs, highlighting the importance of ZnT2 in general mammary gland biology. In this study we used nulliparous and lactating ZnT2-null mice and characterized the consequences on mammary gland development, function during lactation, and milk composition. We found that ZnT2 was primarily expressed in MECs and to a limited extent in macrophages in the nulliparous mammary gland and loss of ZnT2 impaired mammary expansion during development. Secondly, we found that lactating ZnT2-null mice had substantial defects in mammary gland architecture and MEC function during secretion, including fewer, condensed and disorganized alveoli, impaired Stat5 activation, and unpolarized MECs. Loss of ZnT2 led to reduced milk volume and milk containing less protein, fat, and lactose compared with wild-type littermates, implicating ZnT2 in the regulation of mammary differentiation and optimal milk production during lactation. Together, these results demonstrate that ZnT2-mediated zinc transport is critical for mammary gland function, suggesting that defects in ZnT2 not only reduce milk zinc concentration but may compromise breast health and increase the risk for lactation insufficiency in lactating women.Background: ZnT2 is expressed in non-secreting and secreting mammary epithelium; however, the physiological role is not understood.Results: ZnT2-null mice have impaired mammary expansion and compromised mammary differentiation and milk secretion during lactation.Conclusion: ZnT2-mediated zinc transport is critical for mammary development and function during lactation.Significance: This study identifies novel consequences of ZnT2 function in the mammary gland. The zinc transporter ZnT2 (SLC30A2) imports zinc into vesicles in secreting mammary epithelial cells (MECs) and is critical for zinc efflux into milk during lactation. Recent studies show that ZnT2 also imports zinc into mitochondria and is expressed in the non-lactating mammary gland and non-secreting MECs, highlighting the importance of ZnT2 in general mammary gland biology. In this study we used nulliparous and lactating ZnT2-null mice and characterized the consequences on mammary gland development, function during lactation, and milk composition. We found that ZnT2 was primarily expressed in MECs and to a limited extent in macrophages in the nulliparous mammary gland and loss of ZnT2 impaired mammary expansion during development. Secondly, we found that lactating ZnT2-null mice had substantial defects in mammary gland architecture and MEC function during secretion, including fewer, condensed and disorganized alveoli, impaired Stat5 activation, and unpolarized MECs. Loss of ZnT2 led to reduced milk volume and milk containing less protein, fat, and lactose compared with wild-type littermates, implicating ZnT2 in the regulation of mammary differentiation and optimal milk production during lactation. Together, these results demonstrate that ZnT2-mediated zinc transport is critical for mammary gland function, suggesting that defects in ZnT2 not only reduce milk zinc concentration but may compromise breast health and increase the risk for lactation insufficiency in lactating women. Background: ZnT2 is expressed in non-secreting and secreting mammary epithelium; however, the physiological role is not understood. Results: ZnT2-null mice have impaired mammary expansion and compromised mammary differentiation and milk secretion during lactation. Conclusion: ZnT2-mediated zinc transport is critical for mammary development and function during lactation. Significance: This study identifies novel consequences of ZnT2 function in the mammary gland." @default.
• W2257401992 created "2016-06-24" @default.
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• W2257401992 date "2015-05-01" @default.
• W2257401992 modified "2023-10-17" @default.
• W2257401992 title "Essential Role for Zinc Transporter 2 (ZnT2)-mediated Zinc Transport in Mammary Gland Development and Function during Lactation" @default.
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• W2257401992 doi "https://doi.org/10.1074/jbc.m115.637439" @default.
• W2257401992 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4505563" @default.
• W2257401992 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25851903" @default.
• W2257401992 hasPublicationYear "2015" @default.
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