May 2026 in “International Journal of Cosmetic Science” This study found that UV radiation exposure during a simulated Brazilian summer caused more significant mechanical damage to natural hair than bleaching, although both caused comparable structural alterations, with double bleaching leading to the most severe protein degradation.
3 citations
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January 2005 in “Photochemistry and Photobiology” This study found that overexpression of PKCɛ in mouse epidermis increased sensitivity to metastatic squamous cell carcinoma, suggesting that a PKCɛ-mediated microenvironment may promote cancer development through specific cytokines like TNFα.
May 2026 in “Archives of Dermatological Research” This study found that treating human hair with vitamin E and γ-oryzanol significantly reduced UV-B-induced structural damage, with γ-oryzanol providing greater protection, especially in female hair samples. The findings highlight these compounds' potential as cost-effective solutions for preserving hair integrity against UV damage.
September 2025 in “International Journal of Cosmetic Science” This study observed that exposing human hair keratins to heat or UV treatments led to modifications in cysteine residues, disrupting crucial disulphide bonds and potentially reducing the structural integrity of hair similar to prolonged styling or sunlight exposure.
93 citations
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May 2002 in “Journal of Investigative Dermatology” This study found that chronic ultraviolet-B exposure increased skin vascularization and wrinkle formation in mice, while overexpressing the angiogenesis inhibitor thrombospondin-1 reduced these effects, suggesting angiogenesis inhibition as a potential approach to prevent photo-damage.