Table 1.

Enzymatic activities of apoptotic bodies versus intact chondrocytes

	NTPPH	Alkaline phosphatase
Chondrocytes	2.13 ± 0.06	3.65 ± 0.21
Apoptotic bodies	5.35 ± 0.24	3.93 ± 0.41

Chondrocytes were cultured in medium or treated with antibody to Fas (1 μg/ml) for 24 h. Cultures were harvested, and apoptotic bodies were isolated by ultracentrifugation. Equal amounts of chondrocytes or apoptotic bodies as assessed by protein content were analyzed for enzyme content. Results are shown as units/5 μg protein.