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Coptidis Rhizoma inhibits growth and proteases of oral bacteria
Author(s) -
Hu JP,
Takahashi N,
Yamada T
Publication year - 2000
Publication title -
oral diseases
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.953
H-Index - 87
eISSN - 1601-0825
pISSN - 1354-523X
DOI - 10.1111/j.1601-0825.2000.tb00142.x
Subject(s) - prevotella intermedia , porphyromonas gingivalis , minimum inhibitory concentration , actinobacillus , microbiology and biotechnology , bacteria , berberine , chemistry , antibacterial activity , lactobacillus acidophilus , bacterial growth , minimum bactericidal concentration , antibiotics , biology , biochemistry , genetics , probiotic
OBJECTIVE: The aim of this study was to investigate the antibacterial effect of Coptidis Rhizoma (CR), a traditional medicinal plant, on oral bacteria. MATERIALS AND METHODS: CR extract was prepared by boiling CR in water for 2 h. Alkaloids contained in CR extract were assayed by high performance liquid chromatography (HPLC). Antibacterial activity of CR extract was estimated from the lowest concentration that did not permit bacterial growth (minimum inhibitory concentration, MIC) and the concentrations that inhibited 50% of bacterial proteolytic activity (IC 50 ). RESULTS: CR extract inhibited the growth of Actinomyces naeslundii, Porphyromonas gingivalis, Prevotella intermedia, Prevotella nigrescens and Actinobacillus actinomycetemcomitans at MIC of 0.031‐0.25 mg ml ‐1 , whereas it had less inhibitory effect (MIC: 0.5‐2 mg ml ‐1 ) on the growth of Streptococcus and Lactobacillus. The major active component of CR extract was berberine (Ber), an alkaloid, and its inhibiting specificity to bacterial growth was similar to that of CR extract. CR extract and Ber were bacteriostatic at the MICs against most of the bacteria, and bacteriocidal at the concentrations higher than the MICs. Ber inhibited the activities of collagenase from P. gingivalis and A. actinomycetemcomitans. CONCLUSION: CR extract and Ber had an inhibitory effect on periodontopathogenic bacteria. These results suggest the possibility of their clinical application for the treatment of periodontal diseases.