TCF-1 regulates HIV-specific CD8+ T cell expansion capacity

Area of Science:

• Immunology
• Virology
• Cell Biology

Background:

• Cellular exhaustion, characterized by loss of stem-like memory properties, hinders effective HIV cure strategies targeting CD8+ T cells.
• Understanding the regulation of these stem-like properties in human virus-specific CD8+ T cells is critical for developing successful therapies.

Purpose of the Study:

• To investigate the role of transcription factor TCF-1 in regulating the stem-like memory properties of human virus-specific CD8+ T cells.
• To determine if TCF-1 expression levels correlate with the natural control of HIV/SIV infection.

Main Methods:

• Comparative analysis of TCF-1 expression in virus-specific CD8+ T cells from HIV/SIV controllers and noncontrollers in humans and nonhuman primates.
• Assessment of the correlation between TCF-1 expression, memory marker expression, and expansion capacity.
• CRISPR-Cas9 gene editing to evaluate the direct impact of TCF-1 on T cell expansion capacity.

Main Results:

• Virus-specific CD8+ T cells from controllers exhibited higher TCF-1 expression compared to noncontrollers.
• TCF-1 expression positively correlated with memory markers and expansion capacity, declining with antigen stimulation.
• TCF-1 gene editing confirmed its direct role in regulating CD8+ T cell expansion capacity.

Conclusions:

• TCF-1 plays a significant role in maintaining the stem-like memory properties, specifically the secondary expansion capacity, of HIV-specific CD8+ T cells.
• Enhancing the TCF-1 pathway presents a promising therapeutic strategy for T cell-based HIV cures.