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BOR - Papers in Press, published online ahead of print June 15, 2005.
Biol Reprod 2005, 10.1095/biolreprod.105.042077
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BIOLOGY OF REPRODUCTION 73, 745–751 (2005)
DOI: 10.1095/biolreprod.105.042077
© 2005 by the Society for the Study of Reproduction, Inc.

The Translationally Controlled Tumor Protein Is a Novel Calcium Binding Protein of the Human Placenta and Regulates Calcium Handling in Trophoblast Cells1

Felice Arcuri 2, 3, Stefania Papa 3, Antonella Meini 4, Antonietta Carducci 3, Roberta Romagnoli 5, Laura Bianchi 6, Maria Giovanna Riparbelli 7, Jean-Charles Sanchez 8, Mitri Palmi 4, Piero Tosi 3, and Marcella Cintorino 3

Departments of Human Pathology and Oncology,3 Biomedical Sciences,4 Physiology,5 Molecular Biology,6 Evolutionary Biology,7 University of Siena, 53100 Siena, Italy Geneva Proteomics Center,8 Central Clinical Chemistry Laboratory, Geneva University Hospital, 1211 Geneva 14, Switzerland

The translationally controlled tumor protein (TPT1, also known as TCTP) is a highly conserved, abundantly expressed protein found in mammals as well as in a wide range of other organisms of both the animal and plant kingdom. Initially considered as a growth-related protein, later studies showed TPT1 is endowed with multiple biological activities, including calcium binding. The present study aimed to evaluate the expression of TPT1 in the human placenta and to examine the functional role of the protein in the calcium binding and homeostasis of trophoblast cells. Samples were analyzed by Western blot, reverse transcription-polymerase chain reaction and immunohistochemistry. The effect of TPT1 knockdown by small interfering RNA (siRNA) on calcium uptake and buffering was assessed in the HTR-8/SVneo cell line. TPT1 protein and mRNA were detected in first-trimester and term placenta. In the tissue, TPT1 was localized in the villous trophoblast. TPT1 expression significantly increased during gestation, with the higher protein and mRNA levels reached at term. Recombinant placental TPT1 bound calcium in vitro, while downregulation of the protein levels by siRNA in HTR-8/SVneo cells was associated with a reduced cellular calcium-uptake activity and buffering capacity. These data demonstrate, for the first time, the expression of TPT1 in the human placenta and support a direct role of the protein in placental calcium transport.

calcium, placenta, placental transport, pregnancy, trophoblast

1 Supported by a grant from the University of Siena to M.C.

2 Correspondence: Felice Arcuri, Department of Human Pathology and Oncology, Section of Pathology, University of Siena, Via delle Scotte, 6, 53100 Siena, Italy. FAX: 39 0577 233 235; arcuri{at}unisi.it






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Copyright © 2005 by the Society for the Study of Reproduction.