Zebrafish as a new model for rhododendrol-induced leukoderma

Area of Science:

• Toxicology
• Dermatology
• Developmental Biology

Background:

• Idiopathic leukoderma is a skin condition involving pigment loss.
• Rhododendrol (RD), a cosmetic ingredient, caused leukoderma in thousands of users.
• Predicting melanocyte toxicity in vivo is crucial for cosmetic safety.

Purpose of the Study:

• To evaluate zebrafish larvae as a model for predicting chemical-induced leukoderma.
• To investigate the effects of Rhododendrol (RD) on melanocytes in zebrafish.
• To assess the utility of zebrafish for toxicological assays of depigmenting agents.

Main Methods:

• Zebrafish larvae were exposed to Rhododendrol (RD) for 3 days.
• Quantified melanophore numbers and observed pigment loss.
• Analyzed mRNA levels of melanophore-specific genes using RT-PCR.
• Assessed reactive oxygen species production.

Main Results:

• RD treatment caused significant body lightening and reduced melanophore counts in zebrafish larvae.
• Melanophores detached from the body, and expression of melanophore-specific genes decreased.
• RD induced reactive oxygen species production.
• Other known leukoderma-inducing phenols also caused depigmentation in zebrafish.

Conclusions:

• Zebrafish larvae serve as a viable model for evaluating chemicals that cause leukoderma.
• This model can help predict adverse effects of cosmetic ingredients like RD.
• Zebrafish offer a non-vertebrate alternative for toxicological screening of depigmenting agents.