Characterization of Pattern Recognition Receptor Expression and Functionality in Liver Primary Cells and Derived Cell...

Area of Science:

• Immunology
• Hepatology
• Cell Biology

Background:

• Liver cells have innate immune functions crucial for pathogen control.
• A comprehensive understanding of innate immune signaling in major human liver cells is lacking.

Purpose of the Study:

• To comparatively characterize innate immune signaling pathways in primary human liver cells.
• To assess the expression and function of innate immune sensors and checkpoint ligands.
• To establish a functional Kupffer cell line for immunological studies.

Main Methods:

• Purification of primary human hepatocytes, hepatic stellate cells, liver sinusoidal endothelial cells (LSEC), and Kupffer cells (KC).
• Assessment of mRNA and protein expression of innate immune sensors (TLRs, RLHs, DNA sensors) and checkpoint ligands.
• Stimulation of purified cells with PRR ligands.
• Immortalization of KC to generate a cell line.

Main Results:

• Innate immune sensors and checkpoint ligands are expressed across human liver cells.
• Kupffer cells (KC) exhibit the broadest immune activity upon stimulation.
• The novel KC cell line demonstrates enhanced innate immune functionality compared to THP1 cells.

Conclusions:

• Kupffer cells play a predominant role in liver innate immune sensing.
• The developed KC cell line is a valuable tool for studying innate immunity.
• Findings support understanding immune mechanisms for TLR agonists and checkpoint inhibitors in therapy.