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Related Experiment Video

Updated: May 22, 2026

Obtaining Primary Osteocytes Through Murine Calvarial Fractionation of GFP-Expressing Osteocytes

Obtaining Primary Osteocytes Through Murine Calvarial Fractionation of GFP-Expressing Osteocytes

Published on: June 2, 2020

[Osteocyte and DMP1].

Satoru Toyosawa¹, Kaori Oya, Sunao Sato

¹Department of Oral Pathology, Osaka University Graduate School of Dentistry, Japan.

Clinical Calcium

|May 3, 2012

Summary

Dentin matrix protein (DMP1) regulates phosphate by controlling FGF23 in osteocytes. DMP1 expression varies with osteocyte age, impacting its function and promoter studies.

Area of Science:

Biochemistry
Cell Biology
Genetics

Background:

Dentin matrix protein 1 (DMP1) is a key non-collagenous protein in bone matrix, produced by osteocytes.
Its acidic nature facilitates calcium binding and bone mineralization.
Mutations in DMP1 are linked to autosomal recessive hypophosphatemic rickets (ARHR).

Purpose of the Study:

To investigate the role of DMP1 in phosphate regulation and FGF23 production in osteocytes.
To analyze the expression pattern of DMP1 in different osteocyte populations.
To assess the implications of DMP1 expression patterns for functional studies and promoter use.

Main Methods:

Utilized a murine model of ARHR (DMP1-null mice).
Analyzed fibroblast growth factor 23 (FGF23) expression in osteocytes.

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Examined DMP1 expression levels in osteocytes based on age and location within the bone matrix.

Main Results:

DMP1-null mice exhibited elevated FGF23 expression, indicating DMP1's role in restraining FGF23 production.
DMP1 expression is not uniform across all osteocytes.
Expression is high in young osteocytes and osteoblasts but significantly decreases in older, deeper osteocytes.

Conclusions:

DMP1 plays a crucial role in systemic phosphate homeostasis by modulating osteocytic FGF23 production.
The differential expression of DMP1 in osteocytes suggests context-dependent functions.
Variations in DMP1 expression must be considered when interpreting its function and utilizing the DMP1 promoter in research.