Glutathione concentration in oral cancer tissues

Glutathione (GSH) concentrations in human epidermoid carcinoma tissues were measured by high performance liquid chromatography. The mean glutathione content of 26 epidermoid carcinoma intratumor tissue specimens was 24.36 nmol/mg protein, which was significantly higher than that in adjacent non-tumor tissue parts (3.04 nmol/mg protein). The mean concentration found in normal oral mucosa was 4.80 nmol/mg protein. Tissue GSH levels were not correlated with the age of the patients or tumor size. Additionally, cellular GSH levels in nine different cell lines were found to spread over a wide range from 0.97 to 50.97 nmol/mg protein. Elevated GSH levels in cancer tissues were probably due to their abnormal proliferative activities. These results indicate that the glutathione level of oral tissues may be a useful marker for oral cancer, which is in agreement with findings from lung squamous cell carcinoma, cervical squamous cell carcinoma and other squamous cell carcinomas.