Effective method for discriminating between oral bacterial and human alkaline phosphatase activity

Area of Science:

• Microbiology
• Biochemistry
• Periodontology

Background:

• Alkaline phosphatase (ALPase) is an enzyme found in both oral bacteria and human tissues.
• Distinguishing the source of ALPase in gingival crevicular fluid is crucial for understanding periodontal disease.
• Bacterial and mammalian ALPase isoenzymes may exhibit different sensitivities to inhibitors.

Purpose of the Study:

• To quantitatively compare ALPase activity in various oral bacteria.
• To differentiate bacterial ALPase from mammalian ALPase using sodium dodecyl sulfate (SDS).
• To determine the origin of ALPase in gingival crevicular fluid in periodontitis patients.

Main Methods:

• Quantitative comparison of ALPase activity in different oral bacterial species.
• Assessing the effect of 1% sodium dodecyl sulfate (SDS) on bacterial and mammalian ALPase activity.
• Analyzing ALPase activity in gingival crevicular fluid from periodontitis patients.

Main Results:

• High ALPase activity was detected in periodontal bacteria: *Porphyromonas gingivalis*, *Prevotella intermedia*, and *Capnocytophaga sputigena*.
• Bacterial ALPase activity was significantly inhibited by 1% SDS, while mammalian ALPase isoenzymes were not.
• Gingival crevicular fluid from periodontitis patients showed a combination of SDS-sensitive (bacterial) and SDS-resistant (host) ALPase activities.

Conclusions:

• The SDS-based ALPase assay can effectively distinguish between bacterial and host-derived ALPase.
• ALPase activity in gingival crevicular fluid during periodontitis originates from both bacterial and host sources.
• This assay provides a valuable tool for diagnosing and understanding periodontal disease progression.