AI Article Synopsis
- Low expression of the CD3zeta chain in T cells is linked to cancer, specifically observed in patients with gastric adenocarcinoma, suggesting that it may affect the immune response.
- A study measured CD3zeta and CD3epsilon levels in T-cell lines from cancer patients and healthy volunteers, finding that CD3zeta was significantly reduced, independent of tumor-derived factors.
- This downregulation of CD3zeta in T cells could hinder their ability to effectively combat tumor growth, indicating an inherent characteristic of cancer patient cells rather than a response to external tumor influences.
Article Abstract
Low expression of the CD3zeta chain has been reported in patients with cancer and it has been suggested that tumor-derived factors are involved in its downregulation. The expression of CD3zeta chain was measured in T-cell lines from patients with gastric adenocarcinoma and healthy volunteers and grown in vitro for several months and, hence, in the absence of any tumor-derived factors. T-cell lines of mucosal origin were obtained by Herpesvirus saimiri transformation from gastric cancer patients. The expression of CD3zeta and CD3epsilon was measured by flow cytometry and Western-blot analysis. Calcium mobilization and apoptosis rate were also measured. The levels of CD3zeta, but not CD3epsilon, chain on the cell surface were significantly reduced in T-cell lines derived from patients with gastric cancer when cultured in the absence of IL-2. Western-blot analysis of total cell extracts or lipid raft fractions confirmed this finding. Calcium mobilization, a measure of signal transduction, was reduced in T cell lines from patients with gastric cancer. We conclude that T cells from patients with cancer express lower levels of CD3zeta. This downregulation is not caused by a direct effect of tumor-derived factors but, rather, it appears to be inherent to the patient cells. The low CD3zeta expression would render T lymphocytes unable to control the growth of tumor cells.
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| http://dx.doi.org/10.1016/j.cellimm.2006.02.007 | DOI Listing |
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