Abstract
1. 1. Calcium ion influx varies between different types of young adult rat cartilage. Sternal cartilage accumulates significantly less Ca 2+ than other cartilage types. 2. 2. Influxes of Ca 2+ into young adult and ageing tibial cartilage display no significant differences. 3. 3. Efflux of Ca 2+ from sternal and tibial cartilage resolves into exponential phases indicative of three compartments. Tracheal cartilage displays two compartment behaviour only. 4. 4. Efflux of Ca 2+ from isolated chondrocytes has different characteristics to cartilage efflux with the third slow compartment reduced. 5. 5. Modification of Ca 2+ efflux by lanthanum and barium is suggestive of an exchange of strongly bound extracellular calcium during the slow phase of the efflux from young adult tibial cartilage. 6. 6. The metabolic inhibitor 2,4-dinitrophenol is without effect on the efflux of Ca 2+ from tibial articular cartilage. 7. 7. The degree of calcium binding exhibited during efflux depends upon cartilage type. Non-articular sternal cartilage binds calcium more strongly than articular tibial, both binding more strongly than non-articular tracheal cartilage. 8. 8. In articular cartilage calcium binding shows an age-related increase.
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