RNA polymerase II pausing factor NELF in CD8⁺ T cells promotes antitumor immunity

Area of Science:

• Immunology
• Molecular Biology
• Cancer Research

Background:

• T cell factor 1 (TCF1) is crucial for CD8+ T cell memory and stem-like functions.
• The precise mechanisms by which TCF1 collaborates with other transcription factors remain largely unknown.

Purpose of the Study:

• To investigate the role of negative elongation factor (NELF) in T cell responses to cancer.
• To elucidate the functional partnership between TCF1 and NELF in anti-tumor immunity.

Main Methods:

• Utilized mouse models with Nelfb deletion in mature T lymphocytes.
• Assessed immune responses to primary tumor challenge and tumor antigen vaccination.
• Investigated the recruitment of NELF to TCF1 target genes and its effect on RNA polymerase II (Pol II) pausing and chromatin accessibility.

Main Results:

• Nelfb deletion in T cells impaired anti-tumor immune responses and reduced memory T cell populations.
• Ectopic NELF expression enhanced anti-tumor immunity and chimeric antigen receptor T-cell immunotherapy efficacy.
• NELF was found to associate with TCF1 and regulate Pol II pausing at TCF1 target gene regulatory regions.

Conclusions:

• NELF plays a critical and rate-limiting role in anti-tumor immunity by cooperating with TCF1.
• NELF's function in regulating TCF1 target genes is essential for effective T cell responses against cancer.
• Targeting NELF could represent a novel strategy to enhance cancer immunotherapy.