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We aimed to determine whether suckling animals have greater intestinal calcium permeability to maximize absorption and to identify the underlying molecular mechanism. We examined intestinal claudin expression at different ages in mice and in human intestinal epithelial (Caco-2) cells in response to hormones or human milk. We also measured intestinal calcium permeability in wildtype, Cldn2 and Cldn12 KO mice and Caco-2 cells in response to hormones or human milk. Bone mineralization in mice was assessed by \u03bcCT. Calcium permeability across the jejunum and ileum of mice were 2-fold greater at 2 wk than 2 mo postnatal age. At 2 wk, Cldn2 and Cldn12 expression were greater, but only Cldn2 KO mice had decreased calcium permeability compared to wildtype. This translated to decreased bone volume, cross-sectional thickness, and tissue mineral density of femurs. Weaning from breast milk led to a 50% decrease in Cldn2 expression in the jejunum and ileum. Epidermal growth factor (EGF) in breast milk specifically increased only CLDN2 expression and calcium permeability in Caco-2 cells. These data support intestinal permeability to calcium, conferred by claudin-2, being greater in suckling mice and being driven by EGF in breast milk. Loss of the CLDN2 pathway leads to suboptimal bone mineralization at 2 wk of life. Overall, EGF-mediated control of intestinal claudin-2 expression contributes to maximal intestinal calcium absorption in suckling animals.<\/jats:p>","DOI":"10.1093\/function\/zqad033","type":"journal-article","created":{"date-parts":[[2023,6,26]],"date-time":"2023-06-26T22:29:52Z","timestamp":1687818592000},"source":"Crossref","is-referenced-by-count":8,"title":["Maternal Epidermal Growth Factor Promotes Neonatal Claudin-2 Dependent Increases in Small Intestinal Calcium Permeability"],"prefix":"10.1152","volume":"4","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2690-1785","authenticated-orcid":false,"given":"Megan R","family":"Beggs","sequence":"first","affiliation":[{"name":"Department of Physiology, University of Alberta , Edmonton, AB T6G 2H7 , Canada"},{"name":"The Women's & Children's Health Research Institute , Edmonton, AB T6G 1C9 , 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