| Autor: |
Irena Zore, Marta Krasovec, Nina Cimerman, Robert Kuhelj, Bernd Werle, Hans Jorgen Nielsen, Nils Brünner, Janko Kos |
| Rok vydání: |
2001 |
| Předmět: |
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| Zdroj: |
Biological chemistry. 382(5) |
| ISSN: |
1431-6730 |
| Popis: |
A sandwich-type ELISA has been developed for quantification of the complex between the cysteine proteinase cathepsin B (CB) and its reversible tight-binding inhibitor cystatin C (CC) in normal and pathological sera. The assay is based on a combination of catching Ab (3E1), raised against CB, and a horseradish peroxidase-labelled detection Ab (1A2), raised against CC. Only the CB/CC complex is able to evoke a signal in this assay. The detection limit of the assay was 15.5 nM and the working range between 31.3-200 nM. The within and between-run coefficients of variance (CV) varied from 4.7% to 9.4% and 11% to 12.8%, respectively, demonstrating satisfactory reproducibility of the method. The concentration of the CB/CC complex was determined in sera from 90 healthy controls, 32 patients with non-cancerous lung diseases, 148 patients with lung and 32 patients with colorectal cancer. The CB/CC complex was significantly less abundant in sera of patients bearing malignant lung tumours than in those with non-cancerous lung diseases or healthy controls (p0.001). In colorectal cancer sera its level was significantly lower in advanced stages C and D than in early Dukes' stages A and B (p=0.02). Our results show that the increased levels of CB in malignant sera are not impaired effectively by CC and support the hypothesis of hindered inhibitory capability during cancer progression. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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