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Ultrastructural localization of tartrate-resistant acid phosphatase activity in rat osteoblasts.

Ultrastructural localization of tartrate-resistant acid phosphatase (TRAP) activity in metaphyseal osteoblasts of young rats was detected and compared with the localization of tartrate-sensitive acid phosphatase (TSAP). TRAP activity was detected in lysosomes and Golgi complex, such as Golgi lamellae, vacuoles and vesicles. TSAP, detected as beta-glycerophosphatase, was also located in Golgi lamellae, vacuoles and vesicles, and in lysosomes. Based on the ultrastructural features of TRAP-positive structures and the similarity of the distribution patterns of TRAP and TSAP, it is suggested that TRAP co-exists with TSAP, and is located in lysosomes and secretory granules in osteoblasts.