A role for thyroid hormone in wound healing through keratin gene expression

Area of Science:

• Dermatology and endocrinology
• Molecular biology and gene expression
• Wound healing research

Background:

• The role of thyroid hormone (TH) in wound healing remains incompletely understood.
• TH influences cellular processes, but its specific impact on skin repair and keratinocyte function requires further elucidation.

Purpose of the Study:

• To investigate the effect of TH deficiency on wound-healing gene expression in keratinocytes.
• To determine the necessity of TH for optimal wound healing in a mouse model.
• To explore the therapeutic potential of TH in perioperative wound management.

Main Methods:

• Cultured human keratinocytes were used to assess gene expression via RT-PCR and real-time PCR under varying TH conditions.
• A mouse model of hypothyroidism was employed, comparing wound healing and gene expression in TH-deficient versus TH-replete (T3-treated) animals.

Main Results:

• TH-replete keratinocytes exhibited significantly higher expression of keratin 6a (K6a), 16 (K16), and 17 (K17) compared to TH-deficient cells.
• Mice treated with T3 showed a twofold increase in wound closure compared to hypothyroid mice.
• Skin K6a and K17 gene expression was elevated in control mice compared to hypothyroid mice.

Conclusions:

• Thyroid hormone (T3) is essential for keratinocyte proliferation and stimulates the expression of critical wound-healing keratin genes.
• TH deficiency impairs wound healing, highlighting the importance of adequate thyroid hormone levels during the healing process.
• Perioperative T3 supplementation may be beneficial for hypothyroid patients undergoing surgery to ensure optimal wound healing.