Li Xiaohong,Chen Ling,Zhu Bo.Identification of tumor-infiltrating CD8+PD-1+ T-lymphocytes in Lewis lung cancer[J].J Amry Med Univ (J Third Mil Med Univ),2013,35(05):438-441.
Li Xiaohong,Chen Ling,Zhu Bo.Identification of tumor-infiltrating CD8+PD-1+ T-lymphocytes in Lewis lung cancer[J].J Amry Med Univ (J Third Mil Med Univ),2013,35(05):438-441.DOI:
Objective To identify the biological function of tumor-infiltrating CD8
+
PD-1
+
T-lymphocytes in Lewis lung cancer. Methods The implanted tumor model was established by subcutaneous injection of Lewis lung cancer cells into C57BL/6 mice. CD8
+
PD-1
+
T-lymphocytes and CD8
+
PD-1
-
T-lymphocytes were isolated from transplanted tumors by flow cytometry and
labeled with CFSE to follow their proliferation. The IFN-γ level in isolated cells was analyzed by intracellular cytokine staining. Results CD8
+
T-lymphocytes existed in transplanted tumors. Some of those CD8
+
T-lymphocytes also expressed PD-1
which has been identified as a marker of exhausted T cells. In comparison with CD8
+
PD-1
-
T-lymphocytes
the proliferation rate of CD8
+
PD-1
+
T-lymphocytes significantly decreased and the IFN-γ secretion was suppressed. Conclusion The tumor-infiltrating CD8
+
T-lymphocytes that express PD-1 do not have normal function
which may be the reason for tumor-infiltrating lymphocytes not killing tumor cells effectively.