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Up-and-Coming Drugs for the Treatment of Vitiligo.

Vitiligo is a chronic autoimmune disease that causes depigmented patches on the skin. It affects 0.5%-2.0% of the global population. It goes beyond physical appearance, often leading to stigmatization, low self-esteem, and depression, burdening patients with psychosocial challenges. The pathogenesis of vitiligo involves the loss of melanocytes due to autoreactive CD8+ T cells, triggered by environmental stressors and exacerbated by cellular vulnerabilities and immune responses. The release of danger signals and pro-inflammatory factors initiates an immune cascade perpetuating melanocyte destruction, mainly driven by interferon-γ and the C-X-C motif chemokine ligand 9/10-chemokine receptor 3 axis. Long-lasting tissue-resident memory T cells (Trms) and cytokines contribute to lesion persistence. Current treatments focus on topical steroids and tacrolimus, systemic steroids, and phototherapies, but their efficacy remains suboptimal, necessitating the development of new therapeutic options. Building on recent advancements in understanding the immunological mechanisms in vitiligo pathogenesis, with the initiation of Food and Drug Administration approval of topical ruxolitinib, various potential treatment options such as JAK inhibitors, cytokine blockers, and Trm or regulatory T cell targeting agents are being clinically researched and anticipated for vitiligo based on both preclinical and clinical data. This review aims to categorize and summarize the diverse investigational drugs currently undergoing clinical trials for vitiligo. By examining clinical outcomes, it is anticipated that this review will bring hope to dermatologists and patients regarding vitiligo, a condition that has historically posed challenges and transform it into a realm of potential possibilities.

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