Twenty-One Flavors of Type 1 Innate Lymphoid Cells with PD-1 (Programmed Cell Death-1 Receptor) Sprinkles.

Area of Science:

• Immunology
• Cancer Biology

Background:

• Innate lymphoid cells (ILCs) are key tissue-resident immune cells involved in anti-tumor responses.
• ILCs are categorized into type 1 (ILC1), type 2, and type 3, each with roles in various cancers.

Purpose of the Study:

• This review focuses on Innate lymphoid cells type 1 (ILC1).
• It details ILC1 characterization, function, and plasticity in anti-cancer immunity.
• The review also examines immune checkpoint receptors on ILC1, particularly programmed cell death-1 (PD-1).

Main Methods:

• Literature review and synthesis of current research on ILC1 and anti-cancer immunity.
• Analysis of ILC1 characterization methods and their limitations.
• Exploration of immune checkpoint receptor expression and function on ILC1 subsets.

Main Results:

• ILC1s are vital for initiating anti-tumor immune responses.
• Immune checkpoint receptors, including PD-1, play a role in regulating ILC1 function.
• ILC1 plasticity influences their anti-cancer potential.

Conclusions:

• ILC1s are essential components of the anti-tumor immune response.
• Targeting immune checkpoint receptors on ILC1s offers a strategy to enhance anti-cancer immunity.