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Revisiting the Effect of Aging on the Transport of Molecules through the Skin

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Abstract

Both intrinsic and extrinsic aging lead to a series of morphological changes in the skin including the flattening of the dermal–epidermal junction, increased stratum corneum dryness, reduction in sebaceous gland activity and enzyme activity as well as atrophy of blood vessels. In this study, the impact of these changes on the transport of molecules through the skin was revised. The increase in the number of transdermal formulations on the market in recent decades and life expectancy represent the main reasons for an in-depth discussion of this topic. Furthermore, elderly subjects have often been excluded from clinical trials due to polypharmacy, raising concerns in terms of efficacy and safety. In this way, ex vivo and in vivo studies comparing the transport of molecules through the mature and young skin were analyzed in detail. The reduced water content in mature skin had a significant impact on the transport rate of hydrophilic molecules. The lower enzymatic activity in aged skin, in turn, would explain changes in the activation of prodrugs. Interestingly, greater deposition of nanoparticles was also found in mature skin. In vivo models should be prioritized in future experimental studies as they allow to evaluate both absorption and metabolism simultaneously, providing more realistic information.

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  1. Laboratory of Cosmetic & Pharmaceutical Technology, Department of Pharmaceutical Sciences, Federal University of Santa Catarina, Florianópolis, SC, 88040-900, Brazil

    Tamires de Mello, Débora Fretes Argenta & Thiago Caon

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  1. Tamires de Mello
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Tamires de Mello: Writing—original draft. Débora Fretes Argenta: Writing—review & editing. Thiago Caon: Conceptualization, Writing – review & editing, Supervision.

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de Mello, T., Argenta, D.F. & Caon, T. Revisiting the Effect of Aging on the Transport of Molecules through the Skin. Pharm Res (2024). https://doi.org/10.1007/s11095-024-03710-5

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