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01.03.2010 | Original Article

Effects of transgenic Pit-1 overexpression on calcium phosphate and bone metabolism

verfasst von: Atsushi Suzuki, Patrick Ammann, Keiko Nishiwaki-Yasuda, Sahoko Sekiguchi, Shogo Asano, Shizuko Nagao, Ryosuke Kaneko, Masumi Hirabayashi, Yutaka Oiso, Mitsuyasu Itoh, Joseph Caverzasio

Erschienen in: Journal of Bone and Mineral Metabolism | Ausgabe 2/2010

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Abstract

The type III inorganic phosphate (Pi) transporter Pit-1 was previously found to be preferentially expressed in developing long bones. Several studies also described a regulation of its expression in cultured bone cells by osteotropic factors, suggesting a role of this transporter in bone metabolism. In the present study, we investigated the effects of the transgenic overexpression of Pit-1 in Wistar male rats on calcium phosphate and bone metabolism. A threefold increase and doubling of Pi transport activity were recorded in primary cultured osteoblastic cells derived from calvaria of two transgenic (Tg) lines compared with wild-type littermates (WT), respectively. Skeletal development was not affected by the transgene, and bone mass, analyzed by DXA, was slightly decreased in Tg compared with WT. Enhanced Pi uptake in calvaria-derived osteoblasts from Pit-1 Tg was associated with a significantly decreased expression of alkaline phosphatase activity and a normal deposition and calcification of the collagenous matrix. In 4-month-old adult Tg rats, serum Pi and renal Pi transport were increased compared with WT. The decrease of serum Ca concentration was associated with increased serum parathyroid hormone levels. Variations in serum Pi in Pit-1 Tg rats were negatively correlated with serum fibroblast growth factor-23, whereas 1,25-dihydroxyvitamin D₃ was not affected by Pit-1 overexpression. In conclusion, transgenic Pit-1 overexpression in rats affected bone and calcium phosphate metabolism. It also decreased alkaline phosphatase activity in osteoblasts without influencing bone matrix mineralization as well as skeletal development.

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Titel: Effects of transgenic Pit-1 overexpression on calcium phosphate and bone metabolism
verfasst von: Atsushi Suzuki
Patrick Ammann
Keiko Nishiwaki-Yasuda
Sahoko Sekiguchi
Shogo Asano
Shizuko Nagao
Ryosuke Kaneko
Masumi Hirabayashi
Yutaka Oiso
Mitsuyasu Itoh
Joseph Caverzasio
Publikationsdatum: 01.03.2010
Verlag: Springer Japan
Erschienen in: Journal of Bone and Mineral Metabolism / Ausgabe 2/2010
Print ISSN: 0914-8779
Elektronische ISSN: 1435-5604
DOI: https://doi.org/10.1007/s00774-009-0121-3

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