Mokines such as MIP-1a (CCL3) and MCP-1 (CCL2), respectively involved

Mokines such as MIP-1a (CCL3) and MCP-1 (CCL2), respectively involved in the recruitment of 3PO neutrophils or monocytes, was determined as well (Fig. 3C and 3D) but their concentration was similar in P2Y2+/+ and P2Y22/2 BALFs.We then analysed the cellular infiltrates in the lung by flow cytometry analysis of BALF samples obtained at day 8 and day 10 post-infection. The total number of neutrophils and monocytes recovered in BALF was comparable in P2Y2+/+ and P2Y22/2 mice (Fig. 3E). We observed a weak but not significant increase of neutrophils and monocytes in P2Y22/2 BALF at day 10 (Fig. 3E). Additionally, cytospin preparations of BALF were performed to identify leukocyte subpopulations at day 8. The neutrophil and macrophage populations observed in the BALFs of P2Y2+/+ and P2Y22/2 mice (Fig. 3F) were counted and these results confirmed the flow cytometry analysis (data not shown).Defective infiltration of dendritic cells, and CD4+, and CD8+ T cells in P2Y22/2 inflamed lungsWe have then quantified the number of dendritic cells (DCs), CD4+ and CD8+ T cells in the BALFs of P2Y2+/+ and P2Y22/2 infected mice. We observed a lower infiltration of these three cell populations in the BALFs of P2Y22/2 mice compared to those of P2Y2+/+ mice at days 8 and 10 after infection (Fig. 4A). PVM viral titer was then quantified by quantitative PCR in lung homogenates of P2Y2+/+ and P2Y22/2 mice at day 26001275 8 and day 10 postinfection (Fig. 4B). The data were normalized to the viral titer quantified in P2Y2+/+ lungs at day 8. Whereas their viral titer was comparable at day 8, a MedChemExpress PD1-PDL1 inhibitor 1 higher PVM viral titer was observed in P2Y22/2 lungs compared to P2Y2+/+ lungs at day 10 (Fig. 4B). We next investigated the production of cytokines involved in the action of immune cells in anti-viral defences. More particularly, IL-12, IFN-c, TNF-a and IL-6 levels were quantified by ELISA in P2Y2+/+ and P2Y22/2 BALFs at days 8, 10 and 12 post-infection (Fig. 4C). We observed a lower IL-12 level (474.3675.56 vs. 794.2650.59 pg/mL) at day 8 and a higher IL-6 level (10346165.0 vs. 514.8643.96 ng/mL) at day 10 in the BALFs of P2Y22/2 mice compared to those of P2Y2+/+ mice, respectively (Fig. 4C). The levels of IL-10, IFN-b and IL-17 were also assessedFigure 3. Quantification of neutrophils and macrophages, and their recruiters in the lungs of PVM-infected P2Y2+/+ and P2Y22/2 mice. A . The level of the chemokines KC/CXCL-1 (A), MIP-2/CXCL-2 (B), MIP-1a/CCL3 (C) and MCP-1/CCL2 (D) was determined by ELISA in the BALFs of PVM-infected P2Y2+/+ and P2Y22/2 mice. (N = 9) E. Flow cytometry quantification of neutrophils and macrophages in the BALFs of PVMinfected P2Y2+/+ and P2Y22/2 mice at day 8 and 10 post-inoculation (N = 12). F. Cytospin preparations were made from BALFs of P2Y2+/+ and P2Y22/2 mice at day 8 post-infection using a Shandon III cytocentrifuge and were stained using Diff-Quick staining. Magnification: 6400. doi:10.1371/journal.pone.0050385.gProtective Role of P2Y2 against Pneumonia Virusby ELISA but were not detectable in P2Y2+/+ or P2Y22/2 BALFs. We have then realized a comparative microarray analysis of P2Y2+/+ and P2Y22/2 PVM-infected lungs (data not shown). We focused our attention on inflammatory genes and we observed the down-regulation of BRAK (CXCL-14) in P2Y22/2 lungs (data not shown). We have thus measured the levels of chemokines implicated in the recruitment of DCs, such as IP-10 (CXCL10), MIP-3a (CCL20) and BRAK (CXCL-14) in P2Y2+/+ and P2Y22/ 2 BALFs (Fig. 4D). IP-10 and.Mokines such as MIP-1a (CCL3) and MCP-1 (CCL2), respectively involved in the recruitment of neutrophils or monocytes, was determined as well (Fig. 3C and 3D) but their concentration was similar in P2Y2+/+ and P2Y22/2 BALFs.We then analysed the cellular infiltrates in the lung by flow cytometry analysis of BALF samples obtained at day 8 and day 10 post-infection. The total number of neutrophils and monocytes recovered in BALF was comparable in P2Y2+/+ and P2Y22/2 mice (Fig. 3E). We observed a weak but not significant increase of neutrophils and monocytes in P2Y22/2 BALF at day 10 (Fig. 3E). Additionally, cytospin preparations of BALF were performed to identify leukocyte subpopulations at day 8. The neutrophil and macrophage populations observed in the BALFs of P2Y2+/+ and P2Y22/2 mice (Fig. 3F) were counted and these results confirmed the flow cytometry analysis (data not shown).Defective infiltration of dendritic cells, and CD4+, and CD8+ T cells in P2Y22/2 inflamed lungsWe have then quantified the number of dendritic cells (DCs), CD4+ and CD8+ T cells in the BALFs of P2Y2+/+ and P2Y22/2 infected mice. We observed a lower infiltration of these three cell populations in the BALFs of P2Y22/2 mice compared to those of P2Y2+/+ mice at days 8 and 10 after infection (Fig. 4A). PVM viral titer was then quantified by quantitative PCR in lung homogenates of P2Y2+/+ and P2Y22/2 mice at day 26001275 8 and day 10 postinfection (Fig. 4B). The data were normalized to the viral titer quantified in P2Y2+/+ lungs at day 8. Whereas their viral titer was comparable at day 8, a higher PVM viral titer was observed in P2Y22/2 lungs compared to P2Y2+/+ lungs at day 10 (Fig. 4B). We next investigated the production of cytokines involved in the action of immune cells in anti-viral defences. More particularly, IL-12, IFN-c, TNF-a and IL-6 levels were quantified by ELISA in P2Y2+/+ and P2Y22/2 BALFs at days 8, 10 and 12 post-infection (Fig. 4C). We observed a lower IL-12 level (474.3675.56 vs. 794.2650.59 pg/mL) at day 8 and a higher IL-6 level (10346165.0 vs. 514.8643.96 ng/mL) at day 10 in the BALFs of P2Y22/2 mice compared to those of P2Y2+/+ mice, respectively (Fig. 4C). The levels of IL-10, IFN-b and IL-17 were also assessedFigure 3. Quantification of neutrophils and macrophages, and their recruiters in the lungs of PVM-infected P2Y2+/+ and P2Y22/2 mice. A . The level of the chemokines KC/CXCL-1 (A), MIP-2/CXCL-2 (B), MIP-1a/CCL3 (C) and MCP-1/CCL2 (D) was determined by ELISA in the BALFs of PVM-infected P2Y2+/+ and P2Y22/2 mice. (N = 9) E. Flow cytometry quantification of neutrophils and macrophages in the BALFs of PVMinfected P2Y2+/+ and P2Y22/2 mice at day 8 and 10 post-inoculation (N = 12). F. Cytospin preparations were made from BALFs of P2Y2+/+ and P2Y22/2 mice at day 8 post-infection using a Shandon III cytocentrifuge and were stained using Diff-Quick staining. Magnification: 6400. doi:10.1371/journal.pone.0050385.gProtective Role of P2Y2 against Pneumonia Virusby ELISA but were not detectable in P2Y2+/+ or P2Y22/2 BALFs. We have then realized a comparative microarray analysis of P2Y2+/+ and P2Y22/2 PVM-infected lungs (data not shown). We focused our attention on inflammatory genes and we observed the down-regulation of BRAK (CXCL-14) in P2Y22/2 lungs (data not shown). We have thus measured the levels of chemokines implicated in the recruitment of DCs, such as IP-10 (CXCL10), MIP-3a (CCL20) and BRAK (CXCL-14) in P2Y2+/+ and P2Y22/ 2 BALFs (Fig. 4D). IP-10 and.