Effect of corticosteroid on lymphocyte adhesion

Area of Science:

• Immunology
• Rheumatology
• Pharmacology

Background:

• Pulse steroid therapy is a common treatment for vasculitis and active rheumatoid arthritis.
• The mechanism by which steroids reduce lymphocyte infiltration into tissues is not fully understood but may involve adhesion to endothelial cells.
• Previous research showed rheumatoid synovial fluid mononuclear cells binding to lamina propria endothelium.

Purpose of the Study:

• To investigate the effect of methylprednisolone on lymphocyte adhesion to porcine lamina propria endothelium.
• To explore the potential mechanism of steroid pulsing in treating autoimmune diseases.

Main Methods:

• Lymphocyte adhesion assays were performed using porcine lamina propria endothelium.
• Cells were incubated with varying concentrations of methylprednisolone (0.46mM to 6.3mM).
• Adhesion was measured after incubation at 4°C and room temperature.

Main Results:

• Methylprednisolone significantly decreased lymphocyte adhesion to porcine lamina propria endothelium.
• A clear dose-response relationship was observed.
• The effect was noted at both 4°C and room temperature incubations.

Conclusions:

• Methylprednisolone reduces lymphocyte adhesion to the gut's lamina propria endothelium.
• This effect may be mediated by down-regulating adhesin expression on gut-homing lymphocytes.
• This mechanism could explain the therapeutic benefits of pulse steroid therapy in autoimmune conditions like rheumatoid arthritis.