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Related Experiment Videos

Increased cathepsin D release by Hyp mouse osteoblast cells.

Naoko Matsumoto1, Oak D Jo, Remi N J Shih

  • 1Medical and Research Services, Greater Los Angeles Veterans Affairs Healthcare System at Sepulveda, CA, USA.

American Journal of Physiology. Endocrinology and Metabolism
|June 17, 2005
PubMed
Summary

X-linked hypophosphatemia (XLH) involves increased procathepsin D (Cat D) release from osteoblast cells in mice. This elevated Cat D contributes to impaired bone mineralization, a key feature of XLH disease.

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Area of Science:

  • Biochemistry
  • Genetics
  • Bone Biology

Background:

  • X-linked hypophosphatemia (XLH) is the most common hereditary rickets, characterized by hypophosphatemia and bone disease.
  • XLH pathogenesis involves PHEX gene mutations and potentially osteoblast cell-derived factors.
  • The specific osteoblast-derived factors contributing to XLH bone defects remain unidentified.

Purpose of the Study:

  • To identify osteoblast-derived factors involved in the pathogenesis of X-linked hypophosphatemia (XLH).
  • To investigate the role of procathepsin D (Cat D) in the hypophosphatemic (Hyp) mouse model of XLH.

Main Methods:

  • Proteomic analysis of conditioned media from hypophosphatemic (Hyp) mouse osteoblast cells (ObCs).
  • Metabolic labeling studies to quantify protein release from Hyp mouse ObCs.

Related Experiment Videos

  • In vitro assays measuring osteoblast (45)Ca incorporation and calcification inhibition.

    • Main Results:

    • Murine procathepsin D (Cat D) was identified as a prominent protein released by Hyp mouse ObCs.
    • Hyp mouse ObCs exhibited increased Cat D release and expression compared to wild-type.
    • Cat D exposure inhibited osteoblast calcification, and Cat D inhibition reversed the inhibitory effect of Hyp mouse ObC-conditioned media.

    Conclusions:

    • Hyp mouse ObCs release significantly higher amounts of Cat D.
    • Elevated Cat D release by osteoblasts may contribute to the impaired bone mineralization observed in XLH.