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Metallothionein in human lung carcinoma
B A Hart1, G W Voss, P M Vacek
1Department of Biochemistry, University of Vermont College of Medicine, Burlington 05405.
Cancer Letters
|December 10, 1993
Summary
Metallothionein (MT) and copper levels are significantly higher in lung tumors. This suggests MT may serve as a potential biomarker for early lung cancer detection.
Area of Science:
- Biochemistry
- Oncology
- Toxicology
Background:
- Metallothionein (MT) is a protein involved in metal homeostasis.
- Altered MT expression is observed in various cancers.
- The role of MT and associated metals in lung carcinogenesis requires further elucidation.
Purpose of the Study:
- To investigate metallothionein (MT) and metal (cadmium and copper) content in lung tumors versus non-neoplastic lung tissue.
- To explore the potential of MT as an early detection biomarker for lung carcinoma.
Main Methods:
- Analysis of eleven surgically resected lung cancer and paired non-neoplastic lung tissue samples.
- Quantification of metallothionein using the heme/109Cd binding assay.
- Determination of cadmium and copper content via atomic absorption spectroscopy.
Main Results:
- Significantly elevated concentrations of metallothionein and copper were found in lung tumor tissues compared to non-malignant tissues.
- Copper was the predominant metal bound to MT in lung tumors, while cadmium was primary in non-neoplastic tissue.
- MT and copper levels were notably higher in tumor samples from patients aged 51-79.
Conclusions:
- Elevated metallothionein and copper in lung tumors suggest a role in lung carcinogenesis.
- The distinct metal-binding profiles (Cu in tumors, Cd in normal tissue) indicate differential MT regulation.
- Metallothionein may function as an oncodevelopmental product, offering potential as a biomarker for early lung cancer detection.