Photosensitivity: a current biological overview.

Area of Science:

• Pharmacology
• Toxicology
• Dermatology

Background:

• Growing awareness of increased UV radiation necessitates improved methods for assessing drug-induced photosensitivity.
• The development of new chemicals and pharmaceuticals requires robust pre-testing strategies to identify potential adverse effects, particularly those involving UV light interactions.
• Establishing effective photosensitivity testing systems early in drug discovery is crucial for preventing phototoxic side effects.

Purpose of the Study:

• To comprehensively review existing literature on exogenous photosensitivity.
• To provide an overview of assays utilized for evaluating the photosensitivity potential of drugs and chemicals.
• To summarize testing considerations and guidelines set forth by major regulatory bodies, including the Organization for Economic Cooperation and Development (OECD), U.S. Food and Drug Administration (FDA), and European Union regulatory agencies.

Main Methods:

• A systematic literature search was conducted using medical and scientific databases.
• Websites of the European Union and U.S. Food and Drug Administration regulatory agencies were consulted.
• Keywords included "cutaneous phototoxicity," "phototoxicity in vitro assays," and "phototoxicity in vivo assays."

Main Results:

• The review synthesizes information on various photosensitivity assays.
• It highlights the importance of regulatory guidelines in drug safety assessment.
• The study identifies key considerations for evaluating phototoxicity in drug development.

Conclusions:

• Effective photosensitivity testing is vital for drug safety.
• Regulatory guidelines provide a framework for evaluating phototoxic potential.
• Further development of sensitive and reliable assays is warranted.