Overview
The authors measured the molecular changes that rebuild the skin after CO2 laser resurfacing. They treated sun-damaged forearm skin in 28 volunteers aged 48 to 76 and took repeated biopsies over time. They measured collagen, enzymes, elastic fiber proteins and signaling molecules.
Findings
- 28 adults, ages 48 to 76, with visible sun damage of the forearms; academic dermatology center.
- Focal CO2 laser resurfacing of the forearm; biopsies at baseline and at intervals after.
- Type I procollagen messenger RNA peaked at 7.5 times baseline and type III at 8.9 times baseline, both at 21 days.
- Collagen production stayed high for at least 6 months.
- Rises in interleukin 1 beta, tumor necrosis factor alpha and transforming growth factor beta 1 came before and/or with the collagen changes.
- Matrix metalloproteinase messenger RNA rose sharply: MMP-1 39,130-fold, MMP-3 1,041-fold, MMP-9 75-fold, MMP-13 767-fold.
- Fibrillin and tropoelastin rose later, several weeks after treatment.
- The authors describe an organized, reproducible wound healing response that changes skin structure.
What it means for a patient
- CO2 laser resurfacing triggers the skin to make new collagen for months after treatment.
- Enzymes that break down collagen rose sharply, and elastic fiber proteins rose several weeks later.
- The study was done on forearm skin, not the face, and measured molecules, not appearance.
- It had 28 volunteers and no untreated comparison skin reported in the abstract.
Why this paper matters
It measured the timing and size of collagen, enzyme and signaling changes after CO2 laser resurfacing. The authors suggest these measurements can serve as a benchmark for comparing other treatments for sun-damaged skin. Cited 151 times (NIH iCite, 2026-09-25).
Terms
- CO2 laser resurfacing: a laser treatment that removes thin layers of skin so new skin grows.
- Photodamage: skin damage from sun exposure.
- Procollagen: the building block the body turns into collagen.
- Messenger RNA: the molecule cells use to carry instructions for making a protein.
- Matrix metalloproteinases (MMPs): enzymes that break down collagen and other tissue proteins.
- Cytokines: signaling proteins that control inflammation and healing.
- Tropoelastin and fibrillin: proteins that form elastic fibers in skin.
- Dermal remodeling: rebuilding of the deep skin layer after injury.