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Expression of proteoglycan core proteins in human bone marrow stroma
K P Schofield1, J T Gallagher, G David
1Department of Medical Oncology, Paterson Institute for Cancer Research, Wilmslow Road, Manchester M20 4BX, UK. KSchofield@picr.man.ac.uk
The Biochemical Journal
|October 21, 1999
Summary
Heparan sulphate proteoglycans (HSPGs) like glypican-1, syndecan-3, and syndecan-4 on bone marrow stromal cells are key for hematopoietic stem cell maintenance. Perlecan in the extracellular matrix also plays a vital role in the stem cell niche.
Area of Science:
- Biochemistry
- Cell Biology
- Hematology
Background:
- Heparan sulphate proteoglycans (HSPGs) are crucial for regulating hematopoietic stem and progenitor cell adhesion and growth.
- Syndecan and glypican families are the primary groups of proteoglycans containing heparan sulphate chains.
Purpose of the Study:
- To identify the main surface membrane and matrix-associated HSPGs in human bone marrow stroma.
- To investigate the role of these HSPGs in maintaining the hematopoietic stem cell niche.
Main Methods:
- Extraction of proteoglycans from bone marrow stromal cells.
- Enzymatic treatment with heparitinase and chondroitinase ABC.
- Detection of core proteins via Western blotting and RNA expression analysis using Northern blotting and RT-PCR.
Main Results:
- Glypican-1, syndecan-3, and syndecan-4 were identified as major cell-membrane HSPGs.
- Perlecan was identified as the major extracellular matrix (ECM) proteoglycan.
- A variant form of syndecan-3 (50-55 kDa) was found to be a major stromal HSPG, alongside the characteristic 125 kDa form.
Conclusions:
- Syndecan-3, syndecan-4, glypican-1, and perlecan are essential components of the bone marrow stromal niche.
- These HSPGs likely regulate the maintenance and development of hematopoietic stem and progenitor cells.
- The variant form of syndecan-3 suggests a specific, significant role in hematopoiesis.