PD-1/PD-Ls pathways between CD4+ T cells and pleural mesothelial cells in human tuberculous pleurisy - 12/02/14
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Summary |
Programmed death 1 (PD-1), PD-ligand 1 (PD-L1), and PD-L2 have been demonstrated to be involved in tuberculosis immunity, however, the expression and regulation of PD-1/PD-Ls pathways in pleural mesothelial cells (PMCs) and CD4+ T cells in tuberculous pleural effusion (TPE) have not been investigated.
Expression of PD-1 on CD4+ T cells and expressions of PD-L1 and PD-L2 on PMCs in TPE were determined. The impacts of PD-1/PD-Ls pathways on proliferation, apoptosis, adhesion, and migration of CD4+ T cells were explored.
Concentrations of soluble PD-l, but not of soluble PD-Ls, were much higher in TPE than in serum. Expressions of PD-1 on CD4+ T cells in TPE were significantly higher than those in blood. Expressions of PD-Ls were much higher on PMCs from TPE when compared with those from transudative effusion. Interferon-γ not only upregulated the expression of PD-1 on CD4+ T cells, but also upregulated the expressions of PD-Ls on PMCs. Blockage PD-1/PD-Ls pathways abolished the inhibitory effects on proliferation and adhesion activity of CD4+ T cells induced by PMCs.
PD-1/PD-Ls pathways on PMCs inhibited proliferation and adhesion activity of CD4+ T cells, suggesting that Mycobacterium tuberculosis might exploit PD-1/PD-Ls pathways to evade host cell immune response in human.
Le texte complet de cet article est disponible en PDF.Keywords : Pleural effusion, Programmed death-1, Tuberculosis
Plan
Vol 94 - N° 2
P. 131-139 - mars 2014 Retour au numéroBienvenue sur EM-consulte, la référence des professionnels de santé.
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