GPR55 in B cells limits atherosclerosis development and regulates plasma cell maturation

Area of Science:

• Immunology
• Cardiovascular Research
• Molecular Biology

Background:

• Atherosclerosis involves complex adaptive immune responses.
• Targeting immune pathways offers therapeutic potential.
• The role of lipid signaling in atherosclerosis is under investigation.

Purpose of the Study:

• To investigate the role of the lipid G-protein coupled receptor GPR55 in the adaptive immune response during atherosclerosis.
• To determine the impact of GPR55 on B cell function and atherosclerotic plaque development.

Main Methods:

• Analysis of GPR55 expression in mouse and human atherosclerotic tissues.
• Phenotyping of Gpr55-deficient mice and B cell-specific knockout models.
• In vitro studies using GPR55 ligands and antagonists on plasma cells.

Main Results:

• GPR55 is expressed by plasma cells and upregulated during atherogenesis.
• Gpr55-deficient mice exhibit larger atherosclerotic plaques and increased necrotic core size.
• Lack of GPR55 leads to B cell hyperactivation, impaired plasma cell maturation, and IgG overproduction.

Conclusions:

• GPR55 plays a critical role in modulating the adaptive immune response in atherosclerosis.
• GPR55 in B cells is a potential therapeutic target for reducing atherosclerosis progression.