MicroRNA-Mediated Regulation of Hair Follicle Regeneration: Mechanisms, Delivery Strategies, and Translational Perspectives

This review discusses the role of immune cells in the pathogenesis of alopecia areata and highlights emerging immunomodulatory strategies and novel therapeutic targets aimed at offering more effective and durable treatments for this autoimmune hair loss disorder.

This review article examines current drugs for androgenetic alopecia, focusing on their mechanisms and clinical efficacy, noting that while finasteride and minoxidil are commonly approved treatments, new drugs targeting different pathogenic pathways have emerged, offering a broader understanding and reference for AGA treatment options.

This review discusses the role of dermal papilla cells in hair follicle formation and their potential use in cell therapy for hair loss, but reports no new research findings.

In this review, researchers introduced clinically tunable siRNA delivery systems for hair loss treatment, discussing design principles and analyzing relevant clinical trials to propose a framework for optimizing siRNA delivery in a clinical context.

Understanding the hair growth cycle in mice is crucial for accurate research, as it affects study results and requires careful timing and methods.

This review discusses recent advancements in developing delivery systems for small interfering RNA (siRNA) to treat skin conditions, highlighting innovations like liposomes, dendrimers, cell-penetrating peptides, and spherical nucleic acid nanoparticles designed to overcome challenges of skin permeability and degradation.

This study reviewed the safety of JAK inhibitors for alopecia areata, finding that common side effects included headache and acne, with varying risks for respiratory infections and no increased risk of serious adverse events.

This review article highlights how hair follicle-targeting drug delivery systems enhance therapeutic outcomes and reduce side effects for treating conditions like androgenetic alopecia and acne vulgaris. The authors discuss current formulations and evaluate their performance in both preclinical and clinical settings.

This review summarizes the role of non-coding RNAs in hair follicle regeneration and highlights potential therapeutic strategies, though it reports no new experimental results.

This study observed variability in hair density and types across different scalp areas in cadaver biopsies, providing reference values that could aid in diagnosing hair disorders in Asians.

This review discusses potential cell sources and bioengineering strategies for regenerating hair follicles with functional cycling, reporting no new results.

This study found that extracellular vesicles from low-passage dermal papilla cells may activate hair growth by delivering miR-140-5p, which downregulates BMP2 signaling, suggesting potential therapeutic targets for alopecia.

This review article summarizes the potential role of advanced medical therapies—using genes, cells, and/or tissue engineering—in treating various types of alopecia, by examining clinical research, basic studies, and ongoing trials.

Dermal exosomes with miR-218-5p boost hair growth by controlling β-catenin signaling.

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 review discusses the role of the immune niche in hair follicle regeneration and its impact on different forms of alopecia, highlighting research gaps and potential therapeutic strategies.

In this study, miR-218-5p was found to enhance hair shaft growth and positively regulate the Wnt signaling pathway by targeting SFRP2 during skin and hair follicle development.

This study proposes the miR-22-5p-LEF1 axis as a novel pathway that may regulate hair follicle stem cell proliferation.

This review discusses the psychological impact of alopecia on women and reports no new clinical findings, highlighting the effect on self-esteem and quality of life.

This study suggests that miRNAs, particularly miR-195-5p, may regulate the loss of hair follicle inductivity in cultured dermal papilla cells by suppressing the Wnt/β-catenin pathway.

Certain microRNAs may help treat alopecia areata by targeting immune pathways.

This article presents a comprehensive guide for classifying human hair follicle cycle stages in vivo using scalp xenografts on immunocompromised mice, offering valuable resources for researchers in the field.

This study suggests that oxidative stress may contribute to androgenetic alopecia by inducing premature senescence and secretion of hair growth inhibitors in dermal papilla cells from balding scalp.

This study found that JAK inhibitors promote hair regrowth in both mice and human alopecia areata cases by blocking key immune pathways involved in disease development.

In this study, researchers showed that Wnt ligands secreted by hair follicle epithelium are crucial for hair follicle regeneration and may be significant for treating hair disorders like alopecia.

This study found that VEGF stimulates the proliferation of human hair follicle dermal papilla cells via the VEGFR-2/ERK pathway, without involving p38, JNK, or AKT signaling.

Alopecia Areata is an autoimmune condition causing hair loss with no cure and treatments that often don't work well.

This review discusses recent advances in understanding hair follicle stem cell dynamics and interactions, but it reports no new experimental findings.

The human hair follicle can store topical compounds and be targeted for drug delivery with minimal side effects.

In this study, miR-31 was found to play a significant role in hair cycle regulation in mice by controlling key gene expressions involved in hair growth and differentiation.

This study found that in mice, inactivating beta-catenin in the dermal papilla reduces hair follicle progenitor proliferation and disrupts the hair cycle.

This review discusses the advantages and limitations of various hair loss evaluation methods but reports no new results; it emphasizes the importance of cautious interpretation for these diagnostic tools.

In this study, researchers found that substance P triggered premature catagen development and immune changes in human scalp hair follicles, providing a possible biological link between stress and hair loss conditions like telogen effluvium and alopecia areata.

The researchers reported that DHT-inducible DKK-1 may play a significant role in DHT-driven balding by inhibiting hair follicle cell growth and promoting apoptosis in androgenetic alopecia.

This study found that VEGF significantly enhances perifollicular vascularization during the hair growth phase, accelerating hair regrowth and increasing follicle and hair size, while its inhibition retards hair growth.

This study developed the Women's Androgenetic Alopecia Quality of Life Questionnaire, which shows high reliability and internal consistency for assessing the impact of AGA on women's quality of life.

Inflammation may be linked to hair loss, and targeting specific enzymes could help treat it.