Sphingosine 1-phosphate promotes antigen processing and presentation to CD4+ T cells in Mycobacterium tuberculosis-infected monocytes.
Sphingosine 1-phosphate (S1P) has recently been described to induce antimycobacterial activity. The present study analyses the role played by S1P in antigen presentation of monocytes and in the next activation of Mycobacterium tuberculosis (MTB)-specific CD4+ T cell response. Results reported herein show that S1P stimulation of MTB-infected monocytes (i) inhibits intracellular mycobacterial growth, (ii) enhances phagolysosome maturation and the transit of mycobacteria in MHC class II compartments, (iii) increases the frequency of MTB-specific CD4+CD69+ T cells, expressing the inflammatory homing receptor CCR5, derived from tuberculosis patients and PPD+, BCG naïve, healthy subjects, and (iv) induces IFN-gamma production in CD4+CD69+CCR5+ T cells derived from PPD+ healthy individuals, only. Altogether, these results show that S1P promotes antigen processing and presentation in monocytes, increases the frequency of MTB-specific CD4+ T cells and can regulate IFN-gamma production by antigen specific CD4+ T cells in the course of active disease.
Department of Biology, University of Rome Tor Vergata, Via della Ricerca Scientifica, 00133 Rome, Italy.
Marilina B
MB
Santucci
Emanuela
E
Greco
Marco
M
De Spirito
Giuseppe
G
Arcovito
Giulia
G
De Angelis
Roberto
R
Cauda
Maurizio
M
Fraziano
D000328:Adult; D017951:Antigen Presentation; D015703:Antigens, CD / Q000276:immunology; D000945:Antigens, Differentiation, T-Lymphocyte / Q000276:immunology; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D045744:Cell Line, Tumor; D005260:Female; D006801:Humans; D007371:Interferon-gamma / Q000096:biosynthesis / Q000276:immunology; D037181:Lectins, C-Type; D008246:Lysophospholipids / Q000378:metabolism*; D008297:Male; D009000:Monocytes / Q000276:immunology* / Q000382:microbiology; D009169:Mycobacterium tuberculosis / Q000276:immunology*; D013110:Sphingosine / Q000031:analogs & derivatives* / Q000378:metabolism; D000099192:CD69 Antigens
D015703:Antigens, CD; D000945:Antigens, Differentiation, T-Lymphocyte; D007371:Interferon-gamma; D037181:Lectins, C-Type; D008246:Lysophospholipids; D013110:Sphingosine; D000099192:CD69 Antigens; C060506:sphingosine 1-phosphate