In vitro dermal intoxication by bis(chloroethyl)sulfide. Effect on secondary epidermization

Area of Science:

• Dermatology
• Toxicology
• Wound Healing Research

Background:

• Bis(beta-chloroethyl)sulfide (BCES), or sulfur mustard, causes skin lesions resembling thermal burns with impaired healing.
• Understanding the mechanisms behind delayed skin healing after BCES exposure is crucial for developing effective treatments.

Purpose of the Study:

• To investigate the mechanisms underlying delayed skin healing caused by bis(beta-chloroethyl)sulfide (BCES) using an in vitro skin equivalent model.
• To elucidate the role of dermal-epidermal interactions in impaired skin reconstruction following BCES intoxication.

Main Methods:

• Developed an in vitro model of skin equivalent for mechanistic studies.
• Assessed dose- and time-dependent cytotoxicity of BCES on dermal equivalents.
• Utilized histological, immunobiochemical, and immunohistochemical analyses to evaluate collagen reorganization, fibronectin synthesis, and basement membrane component expression.

Main Results:

• BCES induced dose- and time-dependent cytotoxicity in dermal equivalents, inhibiting collagen retraction and reorganization.
• Fibroblast fibronectin synthesis was significantly inhibited by BCES exposure.
• Dermal alterations led to secondary disturbances in epithelial maturation, including perturbed cellular adhesion and impaired epidermal differentiation (lack of profilaggrin/filaggrin).

Conclusions:

• Direct dermal damage by BCES fundamentally disrupts dermal-epidermal interactions essential for normal skin reconstruction.
• Impaired biosynthesis and altered dermal structure contribute to the delayed wound healing observed clinically after sulfur mustard exposure.