Human primed ILCPs support endothelial activation through NF-κB signaling

Area of Science:

• Immunology
• Cell Biology
• Cancer Research

Background:

• Innate lymphoid cells (ILCs) are crucial for early immune responses but their role in cancer is unclear.
• Understanding ILC interactions with the tumor microenvironment is vital for developing new cancer therapies.

Purpose of the Study:

• To investigate the interaction between human ILCs and endothelial cells (ECs).
• To determine if ILCs can modulate ECs to influence immune cell trafficking and anti-tumor responses.

Main Methods:

• In vitro co-culture of ILC subsets with endothelial cells.
• Assessment of adhesion molecule expression on ECs.
• Analysis of immune cell adhesion to activated ECs.
• Investigation of signaling pathways (TNF receptor, RANK, NF-κB) involved.

Main Results:

• ILCPs significantly upregulated adhesion molecules on ECs in a contact-dependent manner.
• This upregulation involved TNF receptor and RANK signaling via the NF-κB pathway.
• Activated ECs promoted the adhesion of other immune cells, indicating functional immune cell recruitment.
• Pre-exposure of ILCPs to tumor cells diminished their ability to activate ECs.

Conclusions:

• The ILCP-endothelial cell interaction can enhance immune cell adhesion and trafficking to tumor sites.
• This interaction represents a potential therapeutic target for modulating anti-tumor immune responses.
• Tumor cell-induced modulation of ILCP function may represent an immune evasion mechanism.