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Calcification of Selected Strains of Streptococci

In 1960, Ennever reported that Bacterionema matruchotii forms intracellular calcium phosphate deposits with X-ray maxima essentially identical to those of calcium hydroxyapatite (Ennever, J Periodont 31:304, 1960). Since then, 14 other oral isolates from man and marmoset, including four enteric species, five serotypes of cariogenic Streptococcus mutans, and one strain of Streptococcus sanguis, have been found to calcify under similar experimental conditions (Ennever et al., J Dent Res 51:1483, 1972; Streckfuss et al., J Bacteriol 120:502, 1974). This study was undertaken to determine whether other oral streptococci also possess the capability of calcification (Brown et al., J Dent Res 52: 815, 1973; DHEW Pub No (NIH) 74-286, 1973). S. mitis ATCC 6249 and four laboratory stock strains of S. mitis S21, S23, S32 and S34 were examined, along with S. salivarius ATCC 13419, S. faecalis ATCC 8043 and S. bovis ATCC 9809. A non-calcifiable S. salivarius 125C was used as a control (Ennever et al., op. cit.). Each organism was grown in synthetic calcification medium for two weeks at 370C and processed for X-ray diffraction and electron microscopy as previously reported (Ennever etal., JDentRes 50:1327, 1971). The test isolates produced X-ray diffraction patterns characteristic of apatite with diffuse bands indicating small crystals. Electron micrographs confirmed the X-ray findings, and also disclosed dispersed extracellular deposits in S. mitis S21 and S. faecalis ATCC 8043, in addition to the