Baicalein Resensitizes Multidrug-Resistant Gram-Negative Pathogens to Doxycycline

Area of Science:

• Microbiology
• Pharmacology
• Traditional Chinese Medicine

Background:

• The rise of multidrug-resistant pathogens necessitates novel therapeutic strategies.
• The antibiotic pipeline is diminishing, increasing the need for antibiotic adjuvants.
• Traditional Chinese medicine offers potential sources for antibiotic adjuvants.

Purpose of the Study:

• To investigate baicalein's potential to potentiate doxycycline against multidrug-resistant Gram-negative pathogens.
• To elucidate the mechanisms by which baicalein enhances antibiotic efficacy.
• To evaluate baicalein's therapeutic potential in preclinical models.

Main Methods:

• Mechanism studies involving bacterial membrane interaction and cellular processes.
• In vitro assays to assess reactive oxygen species production, efflux pump activity, and biofilm formation.
• In vitro assessment of lipopolysaccharide-induced inflammatory response.
• In vivo efficacy studies using mouse lung infection models.

Main Results:

• Baicalein disrupts bacterial membranes, facilitating doxycycline entry.
• Baicalein increases reactive oxygen species, inhibits efflux pumps, and reduces biofilm formation.
• Baicalein attenuates inflammatory responses and improves doxycycline efficacy in a mouse lung infection model.
• Baicalein demonstrates low cytotoxicity and low resistance potential.

Conclusions:

• Baicalein is a promising adjuvant that potentiates doxycycline against multidrug-resistant Gram-negative pathogens.
• Baicalein's multifaceted mechanisms contribute to enhanced antibiotic efficacy.
• Baicalein warrants further development as a lead compound to combat antibiotic resistance.
• The combination of baicalein and doxycycline offers a valuable strategy for treating resistant infections.