We studied a primary culture of oral epithelial cells from adult rabbit and reported about dose-dependent growth by Ca increase. Therefore, in the present study we examined the relationship between total Ca, or Ca ion concentration and the proliferation of oral epithelial cells. The results were as followings. 1. The optimal Ca concentration for the growth in primary culture of oral epithelial cells was affected by the serum concentration in the medium. But Ca ion concentration for the best growth was in 10-30 micrograms/ml (0.25-0.74 mM) regardless of the serum concentration. 2. The optimal Ca ion concentration was shifted to 3-20 micrograms/ml (0.075-0.5 mM) in the medium containing chelated serum. This fact, suggests that the chelated serum may play different action from whole serum. 3. The optimal Ca ion concentration in the present study was higher density region than Hennings's view (0.04-0.1 mM) and it was lower than that of Tong (1.4-2.8 mM). Our data coincided with that of Wille (0.18-0.36 mM) who used MCDB 153 medium.
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