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Ultrastructural cartilage abnormalities in MIA/CD-RAP-deficient mice
Markus Moser1, Anja-Katrin Bosserhoff, Ernst B Hunziker
1Institute of Pathology, University Hospital RWTH, D-52074 Aachen, Germany.
Molecular and Cellular Biology
|February 13, 2002
Summary
MIA/CD-RAP protein deficiency in mice leads to subtle cartilage defects. MIA/CD-RAP is essential for the ordered ultrastructure of cartilage fibers and chondrocyte interactions.
Area of Science:
- Biochemistry
- Cell Biology
- Extracellular Matrix Biology
Background:
- MIA/CD-RAP is a secreted protein found in malignant melanoma and chondrocytes.
- It belongs to a family of extracellular proteins with an SH3 domain-like fold.
- MIA/CD-RAP is hypothesized to regulate cell attachment via interactions with extracellular matrix proteins.
Purpose of the Study:
- To investigate the in vivo consequences of MIA/CD-RAP deficiency.
- To determine the role of MIA/CD-RAP in cartilage formation and chondrocyte function.
Main Methods:
- Generation of MIA/CD-RAP gene-disrupted (MIA-/-) mice.
- Confirmation of MIA/CD-RAP absence using RT-PCR, Western blot, and ELISA.
- Histological and electron microscopic analysis of cartilage from wild-type and MIA-/- mice.
Main Results:
- MIA-/- mice were viable with no major organ abnormalities upon light microscopy.
- Electron microscopy revealed defects in collagen fiber architecture (density, diameter, arrangement) in cartilage.
- Chondrocytes in MIA-/- mice showed altered microvilli number and morphology.
Conclusions:
- MIA/CD-RAP is crucial for establishing the highly ordered ultrastructural architecture of cartilage.
- MIA/CD-RAP likely plays a role in regulating chondrocyte interactions with the extracellular matrix.