FP05 Early repair responses in mildly photoaged skin: patch-test evaluation of a novel cosmetic product in adults aged 35–40 years
Orsolya Kiss, Lindsay Cotterell, Anne Chandidzura, Eleanor Bradley, Mike Bell, Mark Farrar, Abigail LangtonAbstract
Introduction and aims
Adults aged 35–40 years typically show minimal visible photoageing; however, early structural decline is already evident, including loss of elasticity, reduced epidermal thickness, and degradation of fibrillin-rich microfibrils at the dermoepidermal junction (DEJ). These subclinical changes represent an ideal window for targeted intervention before overt clinical damage develops. This study used the Manchester Patch Test to evaluate the impact of a newly formulated cosmetic product containing peptides and an antioxidant blend, designed to target early photoageing, on key histological parameters.
Methods
Healthy volunteers aged 35–40 years (4 women, 1 man) with mild photoageing completed a 12-day occluded patch test on extensor forearm skin. Three treatments (vehicle, vehicle + actives, full product) and a no-treatment control were applied. Post-treatment biopsies (3 mm) were analysed histologically for epidermal thickness, DEJ convolution and fibrillin integrity.
Results
All treatments were well tolerated, with minimal irritancy reported. Mean (SEM) epidermal thickness of control skin was 51.9 µm (SEM 10.6). Treatment with vehicle [68.1 µm (SEM 18.1)], vehicle + actives [55.5 µm (SEM 5.6)], or full product [56.5 µm (SEM 7.2)] produced no significant changes, and DEJ convolution remained unchanged. In contrast, fibrillin scoring demonstrated significant improvements in deposition and organization in the papillary dermis following treatment with vehicle + actives [2.9 (SEM 0.3); P = 0.03] and full product [3.3 (SEM 0.4); P = 0.01] compared with control [1.4 (SEM 0.3)]. Vehicle alone [1.7 (SEM 0.3)] did not significantly modulate fibrillin deposition.
Conclusions
In mildly photoaged adult skin, this cosmetic formulation stimulated early repair responses by enhancing fibrillin-rich microfibril deposition, addressing one of the earliest structural changes associated with skin ageing. These results support early intervention as a strategy to maintain dermal integrity before more substantial clinical signs of photoageing appear. Further work will identify and validate the molecular pathways responsible for these repair responses.