Topical thyroid hormone accelerates wound healing in mice

Area of Science:

• Dermatology
• Endocrinology
• Wound Healing Research

Background:

• The physiological role of thyroid hormone in skin is not fully understood.
• Emerging evidence indicates triiodothyronine (T3) is crucial for epidermal proliferation.
• Thyroid hormone's specific function in skin repair processes requires further investigation.

Purpose of the Study:

• To investigate the efficacy of topical supraphysiologic doses of T3 in accelerating wound healing.
• To determine if T3 application enhances skin repair mechanisms in vivo.
• To evaluate T3 as a potential therapeutic agent for wound treatment.

Main Methods:

• Dorsal skin wounds (10 mm diameter) were created in mice.
• Mice were treated with topical T3 (150 ng daily) or a vehicle control (Novasome A).
• Wound closure was measured after 4 days, and keratin 6 protein expression was assessed.

Main Results:

• Topical T3 application resulted in a 58% greater wound closure compared to vehicle control (P < 0.001).
• Keratin 6 protein expression, associated with wound healing, increased in a dose-dependent manner with T3 treatment.
• These findings confirm T3's necessity for optimal wound healing.

Conclusions:

• Topical T3 significantly accelerates the wound healing process in mice.
• T3 promotes key molecular markers of skin repair, such as keratin 6 expression.
• Topical thyroid hormone presents a promising, cost-effective strategy for enhancing the healing of specific types of wounds.