Antimicrobial blue light inactivation of Neisseria gonorrhoeae

Ying Wang; Ying Gu; Tianhong Dai

doi:10.1117/12.2291545

8 February 2018 Antimicrobial blue light inactivation of Neisseria gonorrhoeae

Ying Wang, Ying Gu, Tianhong Dai

Proceedings Volume 10479, Light-Based Diagnosis and Treatment of Infectious Diseases; 104790O (2018) https://doi.org/10.1117/12.2291545
Event: SPIE BiOS, 2018, San Francisco, California, United States

Abstract

Neisseria gonorrhoeae is a human-adapted, gram-negative diplococcus that infects human reproductive tracts and causes gonorrhea, a sexually transmitted disease, resulting in discharge and inflammation at the urethra, cervix, pharynx, or rectum. Over the years, N. gonorrhoeae has developed resistance to nearly every drug ever used to treat it, including sulfonamides, penicillin, tetracycline, and fluoroquinolones. Drug-resistant N. gonorrhoeae is now considered by the Centers for Disease Control and Prevention (CDC) as an urgent threat. The present study aimed to evaluate the efficacy of antimicrobial blue light (aBL) at 405 and 470 nm for inactivating N. gonorrhoeae and reveal the mechanism of action. Our results showed that an exposure of 45 J/cm² aBL at 405 nm reduced the bacterial CFU by 7.16-log₁₀. When the aBL exposure was increased to 54 J/cm², eradication of bacterial CFU was achieved. When the bacteria were exposed to aBL at 470 nm, 3-log₁₀ reduction of CFU was observed at an aBL exposure of higher than 126 J/cm². Absorption and fluorescence spectroscopic analyses revealed the presence of endogenous porphyrins and flavins in N. gonorrhoeae cells. The present study indicated that aBL is a potential strategy to control N. gonorrhoeae infections. Endogenous porphyrins play a vital role in the killing effects of aBL. In vivo experiments are ongoing in our laboratory to treat genital tract infections in mice using aBL and explore the potential clinical applications.

Conference Presentation

Citation Download Citation

Ying Wang, Ying Gu, and Tianhong Dai "Antimicrobial blue light inactivation of Neisseria gonorrhoeae", Proc. SPIE 10479, Light-Based Diagnosis and Treatment of Infectious Diseases, 104790O (8 February 2018); https://doi.org/10.1117/12.2291545

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