RIP1-Mediated Necroptosis Facilitates Oxidative Stress‒Induced Melanocyte Death, Offering Insight into Vitiligo

Area of Science:

• Dermatology
• Cell Biology
• Immunology

Background:

• Vitiligo is a depigmentation disorder caused by melanocyte death via apoptosis and autoimmunity.
• The role of necroptosis, a programmed cell death pathway, in vitiligo remains largely uninvestigated.

Purpose of the Study:

• To investigate the role and mechanism of necroptosis in vitiligo pathogenesis.
• To explore the involvement of the RIP1 signaling pathway in oxidative stress-induced melanocyte death.

Main Methods:

• Detection of necroptosis markers (phosphorylated RIP3, phosphorylated-MLKL) in vitiligo patient skin.
• In vitro studies using melanocytes treated with hydrogen peroxide.
• Intervention with RIP1 inhibitors and MLKL deficiency.
• Analysis of RIP1, RIP3, MLKL, and mitochondrial ROS expression and localization.

Main Results:

• Necroptosis markers were present in melanocytes from vitiligo perilesional skin.
• RIP1 expression increased in hydrogen peroxide-treated melanocytes.
• RIP1 inhibition and MLKL deficiency protected melanocytes against hydrogen peroxide-induced necroptosis.
• RIP1 and RIP3 formed necrosomes, leading to MLKL translocation and melanocyte death.
• RIP1-mediated mitochondrial ROS generation contributed to necrosome formation.

Conclusions:

• Necroptosis plays a significant role in oxidative stress-induced melanocyte death in vitiligo.
• The RIP1 signaling pathway is a key mediator of this necroptotic process.
• Targeting RIP1 may offer a therapeutic strategy for vitiligo.