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Calcification inhibitors in human ligamentum flavum
K Maruta1, K Ichimura, H Matsui
1Department of Orthopaedic Surgery, Faculty of Medicine, Toyama Medical and Pharmaceutical University, Japan.
Summary
Human ligamentum flavum contains substances that inhibit calcification. These calcification inhibitors are produced by ligamentum flavum cells and can prevent calcium uptake in the ligamentum flavum matrix.
Area of Science:
- Biochemistry
- Cell Biology
- Orthopedics
Background:
- Calcification of the ligamentum flavum can lead to spinal stenosis.
- The presence and source of calcification inhibitors in the ligamentum flavum are not well understood.
Purpose of the Study:
- To investigate the presence of calcification inhibitors in human ligamentum flavum.
- To determine if ligamentum flavum cells produce these inhibitors.
Main Methods:
- An Na2HPO4 extract of human ligamentum flavum was tested for its effect on in vitro calcium uptake.
- Grafts of extracted and non-extracted ligamentum flavum were implanted in rats and examined for calcification.
- Human ligamentum flavum cells were cultured, and their medium was tested for crystal inhibitor activity using a hydroxyapatite seed test.
Main Results:
- The ligamentum flavum extract demonstrated an inhibitory effect on calcium uptake by the ligamentum flavum matrix.
- Radiological and histochemical examination of rat muscle grafts showed reduced calcification in extracted matrices.
- The cell culture medium exhibited significant crystal inhibitor activity, indicating production by ligamentum flavum cells.
Conclusions:
- Human ligamentum flavum contains factors that inhibit calcification.
- Human ligamentum flavum cells are capable of producing these calcification inhibitors.