Skeletal Mineralization Deficits and Impaired Biogenesis and Function of Chondrocyte-Derived Matrix Vesicles in Phospho1(-/-) and Phospho1/Pi t1 Double-Knockout Mice

Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research
Manisha C YadavJosé Luis Millán

Abstract

We have previously shown that ablation of either the Phospho1 or Alpl gene, encoding PHOSPHO1 and tissue-nonspecific alkaline phosphatase (TNAP) respectively, lead to hyperosteoidosis, but that their chondrocyte-derived and osteoblast-derived matrix vesicles (MVs) are able to initiate mineralization. In contrast, the double ablation of Phospho1 and Alpl completely abolish initiation and progression of skeletal mineralization. We argued that MVs initiate mineralization by a dual mechanism: PHOSPHO1-mediated intravesicular generation of inorganic phosphate (Pi ) and phosphate transporter-mediated influx of Pi . To test this hypothesis, we generated mice with col2a1-driven Cre-mediated ablation of Slc20a1, hereafter referred to as Pi t1, alone or in combination with a Phospho1 gene deletion. Pi t1(col2/col2) mice did not show any major phenotypic abnormalities, whereas severe skeletal deformities were observed in the [Phospho1(-/-) ; Pi t1(col2/col2) ] double knockout mice that were more pronounced than those observed in the Phospho1(-/-) mice. Histological analysis of [Phospho1(-/-) ; Pi t1(col2/col2) ] bones showed growth plate abnormalities with a shorter hypertrophic chondrocyte zone and extensive hyperosteoidosis. The [Phosph...Continue Reading

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Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research
Manisha C YadavJosé Luis Millán
Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research
Manisha C YadavJosé Luis Millán
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