Pathogenesis and Regenerative Therapy in Vitiligo and Alopecia Areata: Focus on Hair Follicle

This review discusses the current state of alopecia areata treatments, noting that while recent advances such as Janus Kinase inhibitors show promise, persistent challenges like limited efficacy, safety concerns, and patient compliance highlight the need for innovative drug discovery and development strategies.

In this retrospective study, oral tofacitinib treatment for at least 6 months improved scalp hair loss in 69.1% of alopecia areata patients, with patchy AA cases responding better compared to other subtypes, and no significant adverse effects were reported.

This study found that activating autophagy in hair follicle stem cells can promote hair growth by shifting their metabolism to glycolysis, while inhibiting it led to delayed hair cycle progression.

This study reviews the regulatory mechanisms and molecular processes governing stem cell activity in hair follicles, highlighting their roles in hair regeneration and potential implications for treating hair and skin disorders.

This review examines the mechanisms of hair follicle development and regeneration, discussing current hair loss treatments and emerging therapies like low-level laser therapy and stem cell therapy, which the authors suggest show promise in managing hair loss.

This study provided an overview of skin organoids created from pluripotent stem cells, showcasing their potential in dermatologic research and future clinical applications, while noting challenges such as lengthy differentiation protocols that result in heterogeneous products.

In this study, researchers used high-resolution MRI to distinguish anatomical differences in the scalp and hair follicles between tertiary androgenetic alopecia and severe alopecia areata, identifying subcutaneous tissue layer thickness as a key discriminative factor with high diagnostic value.

This review outlines the potential of using human pluripotent stem cells for hair follicle bioengineering, detailing current HF morphogenesis and cycling knowledge, various cell sources, and strategies using iPSCs, while discussing the challenges and prospects for therapeutic use in addressing hair loss.

This review explored recent research on the immune mechanisms and potential therapeutic targets for alopecia areata, highlighting the roles of immune-related cells, autocrine and paracrine signaling, as well as factors like adipose-derived stem cells and gut microbiota in disease pathogenesis.

This study found that human embryonic stem cell-derived mesenchymal stem cells promote hair growth and enhance the transition from the telogen phase to the anagen phase in mice, especially under hypoxic conditions.

This study describes a protocol for generating hair-bearing skin organoids from human pluripotent stem cells, achieving full complexity resembling fetal skin tissue by day 130 in vitro.

This study identified KRT82 as a significant Alopecia Areata risk gene, finding that rare damaging variants are linked to elevated immune cell infiltration around hair follicles in affected individuals.

In this case report, a 28-year-old male with alopecia areata experienced successful hair growth following follicular unit extraction (FUE), with no recurrence observed over a 1-year follow-up.

This paper reviews current data on regenerative medicine with stem cells for treating androgenic alopecia, highlighting recent advancements in simpler and minimally invasive techniques for stem cell isolation and application, though specific results are not detailed.

JAK inhibitors show promise for treating alopecia areata, but more research is needed.

This review discusses immune privilege in anagen hair follicles and its collapse in alopecia areata, emphasizing the importance of restoring this function for effective management and disease relapse prevention.

This article discusses the advancements in follicular unit transplantation for hair restoration and reports no clinical results; it emphasizes improved aesthetic outcomes using updated techniques.

This article explains the FUE technique for hair transplantation, its associated risks and complications, and outlines a protocol for maxillofacial surgeons, but reports no new clinical results.

This review discusses the advancements in intraoperative stem cell therapies and highlights their potential to improve hair regrowth, but it reports no new clinical results.

In this study, researchers developed a new 3D skin equivalent assay using mouse epidermal and dermal cells that successfully regenerated organized hair follicles, outperforming a 2D model in hair follicle orientation and quantity, and enhanced hair growth when Wnt3a was added.

This study found that oral JAK inhibitors, ruxolitinib and tofacitinib, are effective and well-tolerated for treating severe alopecia areata, with a similar degree of hair regrowth and relapse rates, but ruxolitinib induced faster initial hair regrowth.

This review explores recent findings on the roles of melanocyte and melanocyte stem cells in the hair follicle, highlighting their importance for skin health and potential applications in regenerative medicine, but reports no new clinical results.

This review discusses the interactions between melanocyte stem cells and their niche in hair regeneration and repair, but reports no new results; recent studies on molecular pathways are highlighted.

The document concludes that both internal stem cell factors and external influences like the environment and hormones affect hair loss and aging, with potential treatments focusing on these areas.

This study found that altering cell culture conditions to form three-dimensional papilla spheroids can restore the ability of human dermal papilla cells to induce hair growth in adult skin.

This study identified key genetic regions associated with alopecia areata, highlighting both acquired and innate immune involvement, with a novel link to the upregulation of ULBP ligands in autoimmune disease.

NFATc1 controls hair stem cell activity, affecting hair growth and could be a target for hair loss treatments.

This review examines the interplay of genetics and neuroimmunology in alopecia areata, highlighting its potential to inform broader autoimmunity research, but reports no new findings.

In this study, single hair grafting was reported to be an effective treatment for localized/segmental vitiligo, notably in hairy skin areas, with repigmentation observed in 82% of those cases.