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Increased cathepsin B activity in human lung tumors
E Krepela1, E Kasafírek, K Novák
1Research Institute of Tuberculosis and Respiratory Diseases, Prague, Czechoslovakia.
Neoplasma
|January 1, 1990
Summary
Cathepsin B (CB) activity is elevated in most human lung tumors compared to normal lung tissue. This finding holds true for primary lung cancers and lung metastases, suggesting CB
Area of Science:
- Oncology
- Biochemistry
- Enzymology
Background:
- Cathepsin B (CB) is a cysteine proteinase implicated in tumor progression.
- Understanding CB activity in lung tumors is crucial for potential therapeutic strategies.
Purpose of the Study:
- To investigate the levels of cathepsin B activity in primary human lung tumors and lung metastases.
- To compare CB activity in tumor tissues versus adjacent normal lung parenchyma.
Main Methods:
- Enzyme assay using a fluorogenic substrate (Ac-Leu-Arg-Arg-NHMec).
- Inhibition studies to confirm cathepsin B's catalytic role.
- Analysis of tissue samples from lung cancer patients and those with lung metastases.
Main Results:
- Cathepsin B activity was significantly increased in 83% of primary lung tumors compared to normal lung tissue.
- Elevated CB activity was observed in all studied cases of lung adenocarcinoma.
- Higher mean CB activity was found in tumor tissue versus lung parenchyma for squamous cell carcinoma and adenocarcinoma.
- Increased CB activity was also noted in lung metastases compared to surrounding lung tissue.
Conclusions:
- Cathepsin B is frequently upregulated in primary lung tumors and lung metastases.
- The elevated activity of cathepsin B in lung tumor tissues suggests its potential role in lung cancer development and progression.
- Further research into targeting cathepsin B may offer therapeutic avenues for lung cancer.