Matrix metalloproteinase expression in basal cell carcinoma: relationship between enzyme profile and collagen
Taskin Yucel1, Amar Mutnal, Kevin Fay
1Department of Otolaryngology-Head and Neck Surgery, The University of Michigan Medical School, Ann Arbor, MI 48109, USA.
Abstract:
Matrix metalloproteinases (MMPs) with collagenolytic and gelatinolytic activities are up-regulated in basal cell carcinoma. In the present study we demonstrate that the major collagenolytic enzyme detected is MMP-1 (interstitial collagenase) while gelatinolytic enzymes include both MMP-2 (72-kDa gelatinase A) and MMP-9 (92-kDa gelatinase B). Significant fractions of all three enzymes are present as active forms. In spite of the fact that high levels of gelatinolytic enzymes are present, the major fragmentation products resulting from digestion of intact type I collagen are the 1/4 and 3/4 fragments (products of MMP-1-mediated digestion). Thus, it appears that the gelatinolytic enzymes are not capable of degrading the collagen fragments as rapidly as they are produced. Since previous studies have demonstrated that interaction of interstitial fibroblasts with high molecular weight fragments of type I collagen leads to increased MMP production, the present results suggest a mechanism underlying altered function of stromal elements in the connective tissue adjacent to the growing neoplasm.
Insights
Matrix metalloproteinases (MMPs), including MMP-1, MMP-2, and MMP-9, are elevated in basal cell carcinoma. Despite high gelatinase activity, MMP-1 is the primary enzyme degrading type I collagen in this skin cancer.
Area of Science:
- Biochemistry
- Dermatology
- Oncology
Background:
- Matrix metalloproteinases (MMPs) are implicated in cancer progression.
- Specific MMPs with collagenolytic and gelatinolytic activities are upregulated in basal cell carcinoma (BCC).
Purpose of the Study:
- To identify the specific MMPs involved in type I collagen degradation in BCC.
- To elucidate the mechanism of collagen fragmentation and its implications for stromal interaction in BCC.
Main Methods:
- Detection and characterization of MMPs (MMP-1, MMP-2, MMP-9) in BCC tissue.
- Analysis of type I collagen digestion products.
- Assessment of active enzyme fractions.
Main Results:
- MMP-1 (interstitial collagenase) was the major collagenolytic enzyme identified.
- MMP-2 (72-kDa gelatinase A) and MMP-9 (92-kDa gelatinase B) were the primary gelatinolytic enzymes, present in active forms.
- Despite high gelatinase activity, MMP-1 mediated the primary cleavage of type I collagen into 1/4 and 3/4 fragments, suggesting inefficient degradation by gelatinases.
Conclusions:
- MMP-1 plays a dominant role in type I collagen degradation in basal cell carcinoma.
- The observed collagen fragmentation pattern suggests a potential mechanism for altered fibroblast function in the tumor microenvironment.
- These findings contribute to understanding the role of MMPs in BCC pathogenesis and stromal interactions.
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