Light activated compounds as antimicrobial agents - patently obvious?

Area of Science:

• Biochemistry
• Microbiology
• Photochemistry

Background:

• Drug-resistant microbial pathogens (viral, bacterial, eukaryotic) pose a global health threat.
• Photodynamic antimicrobial chemotherapy (PACT) offers a novel therapeutic strategy.
• PACT involves photosensitizers (PS) that target microbial infections.

Purpose of the Study:

• To review the photochemical and photophysical mechanisms of PACT.
• To outline desirable properties for photosensitizer (PS) development.
• To illustrate therapeutic applications of PS in recent patents.

Main Methods:

• Review of photochemical and photophysical principles of PACT.
• Analysis of electronic and physicochemical properties of photosensitizers.
• Examination of patented therapeutic uses of specific photosensitizers.

Main Results:

• PACT efficacy relies on PS activation by light, producing reactive oxygen species.
• Reactive species induce oxidative damage to microbial biomolecules (lipids, proteins, nucleic acids).
• Photosensitizer-biomolecule adducts also contribute to pathogen inactivation.

Conclusions:

• PACT is a promising approach to combatting drug-resistant microbial infections.
• Understanding PS properties is crucial for developing effective PACT agents.
• Recent patents highlight diverse PS applications, including endogenous PS induction and specific chemical classes.