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Σάββατο 8 Δεκεμβρίου 2018

Treatment of actinic keratosis through inhibition of cyclooxygenase‐2: Potential mechanism of action of diclofenac sodium 3% in hyaluronic acid 2.5%

Cyclooxygenase‐2 (COX‐2) and its metabolic product prostaglandin E2 (PGE2) are induced in response to growth factors, inflammatory cytokines, tumour promoters, activated oncogenes and, in the skin, ultraviolet (UV) radiation. Accumulating evidence suggests a role for the COX‐2/PGE2 pathway in tumourigenesis in various tissue types including cutaneous squamous cell carcinoma. There is also strong evidence for a role in the development of actinic keratoses (AKs) – common dysplastic lesions of the skin associated with UV radiation overexposure – considered as part of a continuum with skin cancer. Non‐steroidal anti‐inflammatory drugs (NSAIDs) exert their anti‐inflammatory, analgesic and antipyretic effects by reversibly or irreversibly acetylating COX isoforms, inhibiting downstream prostaglandins, and may have a chemo‐preventive role in malignancies, including skin cancer. Topical treatment of AK lesions with the NSAID diclofenac sodium 3% in combination with hyaluronic acid 2.5% has been shown to be effective and well tolerated, although the mechanism of action remains to be elucidated.

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