Sphingosine-1-Phosphate (S-1P) Promotes Differentiation of Naive Macrophages and Enhances Protective Immunity Against Mycobacterium tuberculosis

V Nadella, L Sharma, P Kumar, P Gupta… - Frontiers in …, 2020 - frontiersin.org
V Nadella, L Sharma, P Kumar, P Gupta, UD Gupta, S Tripathi, S Pothani, S Qadri
Frontiers in immunology, 2020frontiersin.org
Sphingosine-1-phosphate (S-1P) is a key sphingolipid involved in the pathobiology of
various respiratory diseases. We have previously demonstrated the significance of S-1P in
controlling non-pathogenic mycobacterial infection in macrophages, and here we
demonstrate the therapeutic potential of S-1P against pathogenic Mycobacterium
tuberculosis (H37Rv) in the mouse model of infection. Our study revealed that S-1P is
involved in the expression of iNOS proteins in macrophages, their polarization toward M1 …
Sphingosine-1-phosphate (S-1P) is a key sphingolipid involved in the pathobiology of various respiratory diseases. We have previously demonstrated the significance of S-1P in controlling non-pathogenic mycobacterial infection in macrophages, and here we demonstrate the therapeutic potential of S-1P against pathogenic Mycobacterium tuberculosis (H37Rv) in the mouse model of infection. Our study revealed that S-1P is involved in the expression of iNOS proteins in macrophages, their polarization toward M1 phenotype, and secretion of interferon (IFN)-γ during the course of infection. S-1P is also capable of enhancing infiltration of pulmonary CD11b+ macrophages and expression of S-1P receptor-3 (S-1PR3) in the lungs during the course of infection. We further revealed the influence of S-1P on major signaling components of inflammatory signaling pathways during M. tuberculosis infection, thus highlighting antimycobacterial potential of S-1P in animals. Our data suggest that enhancing S-1P levels by sphingolipid mimetic compounds/drugs can be used as an immunoadjuvant for boosting immunity against pathogenic mycobacteria.
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