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Updated: May 29, 2026
Tropomodulin 3 Overexpression as a Marker for Platinum Resistance and Immune Infiltration in Ovarian Cancer
Published on: August 2, 2024
Human ovarian tumor cells escape γδ T cell recognition partly by down regulating surface expression of MICA and
Jingwei Lu1, Reeva Aggarwal, Suman Kanji
1Cardiovascular Medicine, The Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University, Columbus, Ohio, United States of America.
Background:
Mechanisms of human Vγ2Vδ2 T cell-mediated tumor immunity have yet to be fully elucidated.
Methods And Findings:
At least some tumor cell recognition is mediated by NKG2D-MICA interactions. Herein, by using MTT assay and PI-BrdU co-staining and Western-blot, we show that these Vγ2Vδ2 T cells can limit the proliferation of ovarian tumor cells by down regulation of apoptosis and cell cycle related molecules in tumor cells. Cell-to-cell contact is critical. γδ T cell-resistant, but not susceptible ovarian tumor cells escape γδ T cell-mediated immune recognition by up-regulating pErk1/2, thereby decreasing surface MICA levels. Erk1/2 inhibitor pretreatment or incubation prevents this MICA decrease, while up-regulating key cell cycle related molecules such as CDK2, CDK4 and Cyclin D1, as well as apoptosis related molecules making resistant tumor cells now vulnerable to γδ T cell-mediated lysis.
Conclusion:
These findings demonstrate novel effects of γδT cells on ovarian tumor cells.
Insights
Human Vγ2Vδ2 T cells limit ovarian tumor cell proliferation by downregulating apoptosis and cell cycle molecules. Tumor cells resist by upregulating pErk1/2, decreasing MICA, but Erk1/2 inhibition restores MICA and T cell-mediated lysis.
Area of Science:
- Immunology
- Oncology
- Cell Biology
Background:
- The mechanisms of human Vγ2Vδ2 T cell-mediated tumor immunity are not fully understood.
- NKG2D-MICA interactions play a role in tumor cell recognition by Vγ2Vδ2 T cells.
Purpose of the Study:
- To elucidate the mechanisms by which Vγ2Vδ2 T cells inhibit ovarian tumor cell proliferation.
- To investigate the role of pErk1/2 and MICA in Vγ2Vδ2 T cell-mediated tumor immune evasion.
Main Methods:
- MTT assay
- Propidium Iodide (PI)-BrdU co-staining
- Western blot analysis
- Use of Erk1/2 inhibitor
Main Results:
- Vγ2Vδ2 T cells limit ovarian tumor cell proliferation by downregulating apoptosis and cell cycle-related molecules.
- Ovarian tumor cells resist Vγ2Vδ2 T cell recognition by upregulating pErk1/2, which decreases surface MICA levels.
- Erk1/2 inhibition restores MICA levels and sensitizes resistant tumor cells to Vγ2Vδ2 T cell-mediated lysis by upregulating cell cycle and apoptosis-related molecules.
Conclusions:
- Vγ2Vδ2 T cells exert novel inhibitory effects on ovarian tumor cells.
- Targeting the Erk1/2 pathway can overcome tumor immune evasion and enhance Vγ2Vδ2 T cell immunotherapy for ovarian cancer.
