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A prolonged and exaggerated wound response with elevated ODC activity mimics early tumor development
Candace S Hayes1, Karen Defeo, Hong Dang
1Lankenau Institute for Medical Research, Wynnewood, PA 19096, USA.
Carcinogenesis
|July 7, 2011
Summary
Polyamines, regulated by ornithine decarboxylase (ODC), promote skin cell growth and inflammation. Inhibiting ODC in wound healing prevents abnormal skin thickening and tumor formation in mice.
Area of Science:
- Dermatology
- Oncology
- Molecular Biology
Background:
- Chronic wounds are a risk factor for skin cancer.
- Ornithine decarboxylase (ODC) is a key enzyme in polyamine biosynthesis.
- Polyamines stimulate cell proliferation and can promote tumorigenesis.
Purpose of the Study:
- To investigate the role of ODC and polyamines in skin wound healing and associated tumorigenesis.
- To examine the effects of ODC induction in different skin layers following abrasion.
- To evaluate the therapeutic potential of anti-inflammatory and ODC-inhibiting agents.
Main Methods:
- Utilized K6/ODC and inducible ODCER transgenic mouse models.
- Induced skin remodeling via epidermal abrasion.
- Administered dexamethasone (anti-inflammatory) and α-difluoromethylornithine (ODC inhibitor).
Main Results:
- ODC transgenic mice showed progressive epidermal hyperplasia and benign tumor growth after abrasion.
- Abrasion sites in ODC transgenic mice exhibited sustained proliferation and inflammation.
- Dexamethasone reduced hyperplasia and tumor growth; α-difluoromethylornithine normalized wound response.
Conclusions:
- Polyamines stimulate proliferation and prolong inflammation during wound healing, contributing to hyperplasia and tumor growth.
- ODC activity is crucial for sustained wound-induced epidermal changes and tumor development.
- Targeting polyamine synthesis or inflammation may prevent skin cancer in chronic wound settings.
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