Determination of optimal liquid medium for enzyme expression by Helicobacter pylori.
Medical Biotechnology Laboratory, School of Medical Technology, Chang Gung College of Medicine and Technology, Kweishan, Taoyuan, Republic of China.
AIMS: To determine the best medium for the growth and enzyme expression of Helicobacter pylori. METHODS: Twelve H pylori isolates from histologically confirmed infected patients were cultured on Brucella broth (BB), Brucella broth minus bisulphite (BLBB), and brain-heart infusion broth (BHIB), all supplemented with 5% (v/v) fetal calf serum. Growth rates and enzyme expressions of all H pylori isolates cultivated in these media were evaluated. RESULTS: Although both BLBB and BHIB supported good growth of H pylori under microaerophilic conditions, the total protein content of H pylori detected was much higher with BHIB cultivation. Measurement of the specific activities of urease, phospholipase C, and sphingomyelinase for 12 H pylori isolates cultivated in these media, showed that BHIB supported the highest expression of these enzymes. Although BLBB supported better growth of H pylori than BB, it did not increase enzyme expression. CONCLUSIONS: Cultivation of H pylori in BHIB is recommended for studies on the physiology, metabolism, and enzyme expression of the organism.
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Megraud, F., Lehours, P.
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