Leukocyte activation and function-associated antigens in inflammatory disease

Area of Science:

• Immunology
• Cell Biology
• Rheumatology

Background:

• Peripheral blood leukocyte (PBL) analysis is crucial for understanding immune responses in inflammatory diseases.
• Adhesion and function-associated molecules on PBLs can indicate cellular activation states.

Purpose of the Study:

• To investigate the expression of specific cell surface molecules on PBLs from patients with adult periodontitis (PD), ankylosing spondylitis (AS), and rheumatoid arthritis (RA).
• To determine if observed changes in antigen expression correlate with leukocyte activation in these conditions.

Main Methods:

• A novel rapid fixation technique was employed for leukocyte preparation to prevent antigen artifact.
• Flow cytometry was used to assay expression of CD11a, CD11b, CD18, CD3, CD4, CD8, CD16, CD19, CD56, and CD57 on PBLs.
• Analysis included normal controls, PD, AS, and RA patient groups.

Main Results:

• Rheumatoid arthritis (RA) patients showed decreased CD18+ lymphocytes and increased CD11b+ neutrophils. Lymphocyte CD11b and CD18 mean fluorescence intensity (MFI) decreased, while CD57 MFI increased.
• Ankylosing spondylitis (AS) patients exhibited increased CD11b+ lymphocytes and neutrophils, and decreased CD18+ lymphocytes and neutrophils. Lymphocyte CD11b and CD18 MFI decreased, CD16 MFI increased, and neutrophil CD18 MFI increased.
• No significant differences in antigen expression were observed in periodontitis (PD) patients compared to controls.

Conclusions:

• Altered antigen expression on PBLs in RA and AS patients suggests leukocyte activation.
• The findings indicate distinct immune cell activation patterns in RA and AS, differentiating them from PD.
• Leukocyte activation markers may serve as potential indicators for inflammatory rheumatic diseases.