Tumor necrosis factor-induced E-selectin expression on vascular endothelial cells

Area of Science:

• Immunology
• Cell Biology
• Vascular Biology

Background:

• Tumor necrosis factor (TNF) plays a crucial role in inflammatory responses.
• E-selectin is an adhesion molecule expressed on endothelial cells during inflammation.
• The specific TNF receptors mediating E-selectin induction require elucidation.

Purpose of the Study:

• To identify the specific tumor necrosis factor (TNF) receptor subtypes responsible for inducing E-selectin expression on vascular endothelial cells.
• To investigate the role of CD120a and CD120b receptors in TNF-mediated E-selectin upregulation.

Main Methods:

• In vitro study using cultured human umbilical vein endothelial cells.
• Recombinant human TNF (rhTNF) was used to induce E-selectin expression.
• Monoclonal antibodies against TNF receptors (anti-CD120a and anti-CD120b) were employed to block receptor binding.
• E-selectin expression was quantified using indirect immunofluorescence and flow cytometry.

Main Results:

• Blocking either CD120a or CD120b receptors individually significantly inhibited TNF-induced E-selectin expression.
• Simultaneous blockade of both CD120a and CD120b receptors resulted in synergistic inhibition.
• The degree of E-selectin expression inhibition was dependent on both TNF and antibody concentrations.

Conclusions:

• Both CD120a and CD120b receptors are critically involved in TNF-induced E-selectin expression on human umbilical vein endothelial cells.
• Targeting either or both TNF receptors can modulate E-selectin expression, offering potential therapeutic strategies.
• The inhibitory effect on E-selectin expression is concentration-dependent on both TNF and blocking antibodies.