Genetically modified keratinocytes transplanted to wounds reconstitute the epidermis

Area of Science:

• Regenerative Medicine
• Dermatology
• Genetic Engineering

Background:

• Keratinocyte transplantation is a key strategy for skin wound repair.
• Genetically modifying keratinocytes offers potential for enhanced therapeutic effects.
• Understanding the integration and function of engineered cells in vivo is crucial.

Purpose of the Study:

• To evaluate the survival and integration of retrovirally transfected keratinocytes in full-thickness skin wounds.
• To assess the expression of introduced genes (beta-galactosidase and human growth hormone) in transplanted keratinocytes.
• To determine the impact of keratinocyte transplantation on wound healing and epithelial barrier restoration.

Main Methods:

• Keratinocyte suspensions transfected with beta-galactosidase or human growth hormone (hGH) genes were transplanted into Yorkshire pig wounds.
• Immunostaining of sequential skin biopsies was performed to track cell survival and gene expression.
• Wound fluid was analyzed for the presence of hGH.
• Epithelial barrier function was assessed by comparing transplanted wounds to controls.

Main Results:

• Transplanted keratinocytes survived and expressed beta-galactosidase in vivo.
• Engineered keratinocytes integrated into wound tissues, migrating from the dermis to the epidermis.
• Human growth hormone was detected in wound fluid for 10 days post-transplantation.
• Wounds with transplanted keratinocytes (normal or engineered) showed significantly faster epithelial barrier restoration compared to controls.

Conclusions:

• Successful transplantation and integration of genetically engineered keratinocytes in skin wounds were confirmed.
• Transplanted keratinocytes accelerated wound healing and restored epithelial barrier function.
• This approach shows promise for developing gene-based therapies to deliver therapeutic proteins and enhance wound healing.