Adiponectin induces pro-inflammatory programs in human macrophages and CD4+ T cells

Area of Science:

• Immunology
• Endocrinology
• Molecular Biology

Background:

• Adiponectin plays a modulatory role in inflammation, dysmetabolism, and disease.
• Immune cell activation is crucial in diseases like atherosclerosis and obesity.

Purpose of the Study:

• To investigate adiponectin's role in human macrophage polarization and T cell differentiation.
• To elucidate the molecular mechanisms underlying adiponectin's effects on immune cells.

Main Methods:

• Transcriptome analysis of adiponectin-treated human macrophages.
• Assessment of adiponectin's impact on CD4(+) T lymphocyte proliferation, cytokine production, and signaling pathways.
• Inhibition of p38 mitogen-activated protein kinase (MAPK) to assess its role in adiponectin-induced effects.

Main Results:

• Adiponectin induced a pro-inflammatory macrophage response, distinct from classical M1/M2 polarization.
• Adiponectin increased interferon-gamma (IFN-γ) and interleukin-6 (IL-6) in CD4(+) T cells.
• Adiponectin activated the p38 MAPK, signal transducer and activator of transcription (STAT) 4, and T-bet, driving T(H)1 differentiation.

Conclusions:

• Adiponectin induces pro-inflammatory functions in macrophages and T cells.
• Adiponectin enhances T(H)1 differentiation through the p38-STAT4-T-bet signaling axis.
• Adiponectin may desensitize immune cells to subsequent pro-inflammatory stimuli through limited inflammatory activation.