Linking IFN-γ-Mediated Pathogenesis to ROCK-Targeted Therapy in a Scalable iPSCs-Based Vitiligo Model

Area of Science:

• Dermatology
• Immunology
• Cell Biology

Background:

• Vitiligo is an autoimmune skin condition causing depigmentation due to melanocyte loss.
• Current vitiligo treatments have limited efficacy, and scalable human models are lacking.
• Interferon-gamma (IFN-γ) plays a key role in vitiligo pathogenesis by promoting T-cell recruitment and melanocyte apoptosis.

Purpose of the Study:

• To develop a tunable in vitro platform for studying vitiligo pathogenesis and evaluating potential therapies.
• To investigate the efficacy of ROCK inhibitor Y27632 in a novel IFN-γ-induced vitiligo model.

Main Methods:

• Co-culture of human induced pluripotent stem cell-derived melanocytes (iMc) with keratinocytes on Matrigel.
• Exposure to graded concentrations of IFN-γ to mimic vitiligo pathology.
• Assessment of iMc survival, dendritic structure, and expression of key molecules following Y27632 treatment.

Main Results:

• The in vitro platform accurately replicated IFN-γ-induced decreases in iMc survival and dendritic structure.
• ROCK inhibition with Y27632 upregulated adhesion molecules (E-cadherin, DDR1) and growth factors (ET1, bFGF).
• Y27632 treatment reversed melanocyte dendritic retraction and enhanced iMc-keratinocyte viability.

Conclusions:

• ROCK blockade is a promising adjunctive strategy for vitiligo treatment.
• The developed in vitro platform serves as a valuable pre-clinical tool for evaluating combination therapies for vitiligo.
• Further research using this platform could lead to strategies for durable pigment restoration in vitiligo patients.