Role of healthy skin molecular phenotype in the switch to specific skin diseases

特应性皮炎(AD)、化脓性汗腺炎和红斑狼疮的风险很大 在非裔美国人(AA)人口中更高，而白人非西班牙裔(WNH)受试者有更大的 患牛皮癣的风险。不同炎症皮肤易感性差异的机制 人们对疾病知之甚少。在我们的试点实验中，使用了经过广泛验证的RNA-seq分析 我们发现健康的AA和WNH皮肤的基因表达有显著的差异，富含 促炎信号。此外，3D人类皮肤等效培养(HSE)由人类 种植在胶原基质上的原代角质形成细胞似乎对 参与多发性炎症皮肤的原型细胞因子TNFa的促炎作用 疾病。这些结果提示再生障碍性关节炎皮肤/角质形成细胞中的内在促炎回路可能 在再生障碍性贫血人群中导致某些炎症性皮肤病的增加 包括公元。然而，触发这种矛盾的疾病前期转变的分子机制 针对特定炎症性皮肤病的炎症信号仍有待研究。3DHSE 由原代人类角质形成细胞和免疫细胞以及经 Th1/Th17细胞因子(TNFa、IL17、IL22)或Th2细胞因子(IL4、IL13)已成功用于 在体外诱导牛皮癣和阿尔茨海默病的典型的形态和分子变化。因此，我们 假设AA和WNH健康皮肤的不同分子表型定义了分子开关 对于前AD或前银屑病的信号，我们可以描绘出最初的显著阶段 在这个过程中，使用AA和WNH 3D HSE和经Th1/Th17处理的皮肤外植体培养 (TNFa、IL17、IL22)或Th2(IL3、IL14)细胞因子。我们建议使用体外皮肤模型：制作3D HSE 来自AA和WNH成人皮肤细胞(来自同一供体的角质形成细胞、成纤维细胞和T细胞)和 SBDRC西北部STEM Core提供的AA和WNH人皮肤外植体培养 细胞因子治疗。我们建议使用综合方法，包括rna-seq、q-pcr、邻近性。 延伸免疫-聚合酶链式反应分析(Olink蛋白质组学)，经Vectra免疫染色证实 多光谱成像仪识别3D HSE/皮肤外植体基因/蛋白表达的变化 在使用AD相关细胞因子或银屑病相关细胞因子治疗期间。我们将这些更改与已有的更改进行比较 识别/发表AD和牛皮癣患者非皮损和皮损皮肤的分子特征。 我们还将确定作为牛皮癣和阿尔茨海默病一部分的表皮屏障的变化 病理生理学。我们预计，所获得的结果将揭示是否以及可能如何 健康皮肤的分子表型定义了向特定皮肤病的切换，并将为 为不同的少数群体制定个性化的预防方法，

The risk of atopic dermatitis (AD), hidradenitis suppurativa, and lupus erythematosus is significantly higher in African American (AA) population, while White Non-Hispanic (WNH) subjects have a greater risk of psoriasis. The mechanisms that underlie disparity in susceptibility to different inflammatory skin diseases are poorly understood. In our pilot experiments, using extensively validated RNA-seq analysis we revealed striking differences in gene expression in healthy AA versus WNH skin, enriched for proinflammatory signaling. In addition, 3D human skin equivalent cultures (HSE) made from human primary keratinocytes seeded on collagen matrix, appeared to have a much more robust response to the pro-inflammatory effects of TNFa, a prototype cytokine involved in multiple inflammatory skin diseases. These results suggested that intrinsic pro-inflammatory circuits in AA skin/keratinocytes may contribute to the increased development of certain inflammatory skin diseases in the AA population including AD. However, the molecular mechanisms that trigger the shift of this “ambivalent” pre-disease inflammatory signaling towards specific inflammatory skin diseases remain to be investigated. 3D HSE made from primary human keratinocytes and immune cells as well as skin explant cultures treated with Th1/Th17 cytokines (TNFa, IL17, IL22) or Th2 cytokines (IL4, IL13) have been successfully used to induce in vitro morphological and molecular changes typical for psoriasis and AD. Thus, we hypothesized that different molecular phenotypes of AA and WNH healthy skin define molecular switch towards either pro-AD or pro-psoriasis signaling and that we could delineate the initial significant stages in this process using AA and WNH 3D HSE and skin explant cultures treated with Th1/Th17 (TNFa+IL17+IL22) or Th2 (IL3+IL14) cytokines. We propose to use in vitro skin models: 3D HSE made from AA and WNH adult skin cells (keratinocytes, fibroblasts and T cells from the same donor) and explant cultures of AA and WNH human skin provided by STEM Core at Northwestern SBDRC for cytokine treatment. We propose to use comprehensive approach including RNA-seq, Q-PCR, proximity extension immuno-PCR assay (Olink proteomics), confirmed by immunostaining with Vectra Multispectral Imager to identify onset of changes in 3D HSEs/skin explants gene/protein expression during the treatment with AD- or psoriasis-related cytokines. We will compare these changes to already identified/published molecular signatures of non-lesional and lesional skin in AD and psoriasis patients. We will also determine changes in epidermal barrier that are an integral part of psoriasis and AD pathophysiology. We expect that the obtained results will reveal whether and potentially how the molecular phenotype of healthy skin defines the switch to specific skin diseases and will set the stage for the development of personalized prevention approaches for different minority populations,