Efficacy and safety of permeation enhancers: A kinetic evaluation approach and molecular mechanism study in the skin

渗透 角质层 亲脂性 化学 刺激 红斑 色谱法 体内 生物物理学 立体化学 生物化学 皮肤病科 医学 免疫学 生物技术 病理 生物
作者
Jiuheng Ruan,Chao Liu,Jiaqi Wang,Ting Zhong,Peng Quan,Liang Fang
出处
期刊:International Journal of Pharmaceutics [Elsevier BV]
卷期号:626: 122155-122155 被引量:22
标识
DOI:10.1016/j.ijpharm.2022.122155
摘要

This study sought to provide approach for evaluating and predicting the efficacy and safety of permeation enhancers on the basis of their kinetic distribution behavior in the skin dictated by physicochemical properties. Herein, the efficacy-safety regularity of eight permeation enhancers were studied with ex vivo skin permeation study, small-angle X-ray scattering, MTT assay, H&E staining, and in vivo skin erythema analysis, classifying into the following three categories: high enhancement-low irritation, medium enhancement-high irritation, and low enhancement-low irritation. These three modes were positively correlated with the distribution amount of permeation enhancers in the skin layers and verified by the in vitro tape-stripping study. The kinetic parameter, effective-safety index (IES), was proposed to describe the regularity of enhancement effect tendency and irritation risk, and the relationship between IES and physicochemical properties of permeation enhancers was analyzed with multiple regression analysis. According to the results of modulated temperature differential scanning calorimetry and dielectric spectrum, permeation enhancers with high lipophilicity and low polarity had IES > 1, suggesting high enhancement effect and low irritation due to their higher affinity with the stratum corneum (SC) than with epidermis (EP). Permeation enhancers with medium lipophilicity and medium polarity exhibited 0 < IES ≤ 1, showing medium enhancement effect and high irritation, as determined by their comparable affinity with the SC and epidermis (EP). However, permeation enhancers with low lipophilicity and high polarity had IES → 0, demonstrating low enhancement effect and irritation, as indicated by their poor affinity with the SC. In summary, different physicochemical properties of permeation enhancers influenced their affinities with skin layers, resulting in their different enhancement effect and irritation potential. This study will provide a theoretical basis and criteria for evaluating and predicting the safety and efficacy of permeation enhancers, which will enable a more rational selection of permeation enhancers in the optimization of transdermal patches.
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