Beyond Standard pH: Unmasking the Importance of pH-Mimicking Conditions for reliability of Enzyme Activity in Vulvovaginal Candida albicans Isolates

Enzymatic activity potency in Candida albicans is depends on different pH levels. This study investigates the importance of matching in vitro pH conditions to those encountered at infection sites. A total of 20 vulvovaginitis Candida albicans isolates were investigated for phospholipase, proteinase, and esterase activities. The activities were measured at three pH levels (4, 5, and 7) representing for the healthy vaginal range, potential infection condition, and a standard in vitro reference point, respectively. Specific media were used to assess enzyme activity. Phospholipase and proteinase activity were significantly higher at acidic pH compared to neutral pH. In contrast, esterase activity showed a slight increase at neutral pH. Analysis revealed significant differences in enzyme activity between pH 5 and 7, highlighting the importance of using pH-relevant conditions for studying Candida virulence. This study reveals that the acidic vaginal pH characteristic of Candida albicans infections significantly enhances the activity of its key damaging enzymes. This highlights the limitations of using a standard pH protocol for enzyme activity analysis. By employing pH-mimicking conditions, future research can unlock a deeper understanding the actual C. albicans virulence that might occur in site of infection. Data analysis should consider beyond this factor.