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Related Concept Videos

Skin Cancer01:30

Skin Cancer

Skin cancer is a type of cancer that occurs when there is an abnormal growth of skin cells, usually triggered by damage to the DNA within the skin cells. It is primarily caused by exposure to ultraviolet (UV) radiation from the sun or artificial sources like tanning beds. Skin cancer is the most common type of cancer worldwide, and its incidence continues to rise.
Basal Cell Carcinoma (BCC): BCC is the most common type of skin cancer, accounting for about 80% of cases. It typically develops in...

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Cell Population Analyses During Skin Carcinogenesis
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Differential protease expression by cutaneous squamous and basal cell carcinomas.

A P Sappino1, D Belin, J Huarte

  • 1Division of Onco-Haematology, University of Geneva Medical School, Switzerland.

The Journal of Clinical Investigation
|October 1, 1991
PubMed
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This study shows that invasive cancer cells produce urokinase-type plasminogen activator (uPA), which aids tumor invasion. The balance between uPA and its inhibitor PAI-1 influences cancer

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Area of Science:

  • Oncology
  • Biochemistry
  • Cell Biology

Background:

  • Plasminogen activation is implicated in tumor invasion.
  • Understanding the cellular sources of plasminogen activators and inhibitors is crucial for cancer research.

Purpose of the Study:

  • To investigate the cellular sites of urokinase-type plasminogen activator (uPA) and tissue-type plasminogen activator (tPA) synthesis.
  • To examine the production of plasminogen activator inhibitor-1 (PAI-1) and PAI-2 in human cutaneous neoplasias.
  • To correlate these findings with the metastatic potential of different tumor types.

Main Methods:

  • Zymography on tissue sections to detect enzymatic activity.
  • In situ hybridization to determine the cellular sites of gene expression.
  • Analysis of squamous cell carcinomas (SCC) and basal cell carcinomas (BCC) for uPA, tPA, PAI-1, and PAI-2.

Main Results:

  • uPA is produced by malignant cells in SCC, but not in BCC.
  • tPA is found exclusively in nonmalignant dermal tissue.
  • SCC cells produce PAI-1, with production inversely correlating to uPA activity.

Conclusions:

  • Invasive human malignant cells utilize uPA for plasminogen activation during early tumor growth.
  • PAI-1 production modulates the proteolytic activity of tumor cells.
  • Findings support the involvement of plasminogen activation in the malignant behavior and metastatic potential of SCC compared to BCC.