Centro Internacional de Entrenamiento e Investigaciones Médicas, Cali, Colombia.
Universidad Icesi, Cali, Colombia.
J Immunol. 2024 Mar 1;212(5):894-903. doi: 10.4049/jimmunol.2300576.
The immune response is central to the pathogenesis of cutaneous leishmaniasis (CL). However, most of our current understanding of the immune response in human CL derives from the analysis of systemic responses, which only partially reflect what occurs in the skin. In this study, we characterized the transcriptional dynamics of skin lesions during the course of treatment of CL patients and identified gene signatures and pathways associated with healing and nonhealing responses. We performed a comparative transcriptome profiling of serial skin lesion biopsies obtained before, in the middle, and at the end of treatment of CL patients (eight who were cured and eight with treatment failure). Lesion transcriptomes from patients who healed revealed recovery of the stratum corneum, suppression of the T cell-mediated inflammatory response, and damping of neutrophil activation, as early as 10 d after initiation of treatment. These transcriptional programs of healing were consolidated before lesion re-epithelization. In stark contrast, downregulation of genes involved in keratinization was observed throughout treatment in patients who did not heal, indicating that in addition to uncontrolled inflammation, treatment failure of CL is mediated by impaired mechanisms of wound healing. This work provides insights into the factors that contribute to the effective resolution of skin lesions caused by Leishmania (Viannia) species, sheds light on the consolidation of transcriptional programs of healing and nonhealing responses before the clinically apparent resolution of skin lesions, and identifies inflammatory and wound healing targets for host-directed therapies for CL.
免疫反应是皮肤利什曼病(CL)发病机制的核心。然而,我们目前对人类 CL 中免疫反应的大部分了解都来自于对全身反应的分析,而全身反应仅部分反映了皮肤中发生的情况。在这项研究中,我们对 CL 患者治疗过程中的皮肤病变进行了转录动力学特征分析,并确定了与愈合和非愈合反应相关的基因特征和途径。我们对接受治疗的 CL 患者的连续皮肤病变活检进行了比较转录组分析(治愈的 8 例和治疗失败的 8 例)。在治疗开始后 10 天,愈合患者的病变转录组显示出角质层恢复、T 细胞介导的炎症反应抑制和中性粒细胞激活减弱,这表明愈合的转录程序早在病变再上皮化之前就已得到巩固。与此形成鲜明对比的是,在未愈合的患者中,参与角化的基因下调贯穿整个治疗过程,这表明除了不受控制的炎症外,CL 的治疗失败还受到伤口愈合机制受损的介导。这项工作深入了解了有助于有效解决利什曼(Viannia)物种引起的皮肤病变的因素,阐明了在皮肤病变临床明显消退之前愈合和非愈合反应的转录程序的巩固,并确定了针对 CL 的宿主导向治疗的炎症和伤口愈合靶点。
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