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Activity of cysteine proteases and their inhibitors in the lymph nodes of larynx cancer patients. Maciej Siewiński, Izabela Berdowska, Wojciech Mikulewicz, Jan Wnukiewicz, Jan Gutowicz Med Sci Monit 2002; 8(12):BR540-544 ICID: 4814 |
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| Article type: Original article | ||
| IC™ Value: 9.75 | ||
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Department of Medical Biochemistry, Medical University of Wrocław, Poland Department of Otolaryngology, Wrocław Regional Hospital, Wrocław, Poland Department. of Maxillofacial Surgery, Medical University of Wrocław, Poland Department of Microorganism Physico-chemistry, Institute of Microbiology, University of Wrocław, Wrocław, Poland |
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| BACKGROUND: Cysteine endopeptidases and their inhibitors play an important role in the process of carcinogenesis. Positive correlation has been found between tumor invasiveness, its metastatic potential and the secretion of cysteine endopeptidases. Cysteine protease inhibitory activity is also altered in malignant tumors and various body fluids of patients with cancer. MATERIAL/METHODS: Total cysteine endopeptidase activity and cysteine proteinase inhibitory activity were measured in homogenates of cervical lymph node tissue surgically obtained from the larynx of cancer patients. The tissue samples were histologically examined, and each was divided into two parts: positive (PCN), with mostly cancer cells, and negative (NCN), with no cancer cells. RESULTS: In the PCNs, the levels of the assayed enzymes and their inhibitors were significantly higher than in the NCNs. The mean values of cysteine protease activity were 2.70I2.29 and 1.59I1.28 for PCNs and NCNs, respectively (p<0.005). The mean values of cysteine protease inhibitors were 9.1I8.6 and 6.1I6.3 for PCNs and NCNs, respectively (p<0.02). An altered protease-inhibitor activity ratio was also found in PCN samples compared to NCNs. CONCLUSIONS: These data suggest increased activity of cysteine peptidases and their inhibitors in the case of secondary tumor tissue. The cancer cells metastasized to lymph node tissue produce some alteration in balance between cysteine protease activity and the endogenous inhibitors of the proteases. | ||
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ICID 4814 PMID 12503033 - click here to show this article in PubMed database |
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