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Articles in PresS, published online ahead of print November 20, 2001
Am J Physiol Endocrinol Metab, 10.1152/ajpendo.00369.2001
Submitted on August 16, 2001
Accepted on November 14, 2001
1 Faculty of Medicine - Endocrinology, Memorial University, St. John's, NF, Canada
2 Department of Medicine, Austin & Repatriation Medical Center, University of Melbourne, Heidelberg West, Victoria, Australia
* To whom correspondence should be addressed. E-mail: ckovacs{at}mun.ca.
The expression of calcitropic genes and proteins were localized within murine placenta during late gestation (the time frame of active calcium transfer) using an analysis of several gene-deletion mouse models by immunohistochemistry and in situ hybridization. Parathyroid hormone-related protein (PTHrP), the PTH/PTHrP receptor, calcium receptor, calbindin-D9k, Ca2+-ATPase and vitamin D receptor were all highly expressed in a localized structure of the murine placenta, the intraplacental yolk sac, as compared to trophoblasts. In the Pthrp-null placenta in which placental calcium transfer is decreased, calbindin-D9k expression was downregulated in the intraplacental yolk sac but not in the trophoblasts. These observations indicated that the intraplacental yolk sac contains calcium transfer and calcium-sensing capability, and that it is a probable route of maternal-fetal calcium exchange in the mouse.
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