The functions of VLA-1 (CD49a, αIβI integrin), a potential ECM protein receptor on activated human T lymphocytes in vivo, were investigated. VLA-1 is initially markedly upregulated on T cells during the effector/expansion phase in the mediastinal lymph node draining the site of. The α1β1 integrin, very late antigen-1 (VLA-1), is a collagen receptor expressed in many CD4+ T cells localizing to inflamed tissues. Here we show that the. TINA FEY NUDE PLAY BOY The of a the for alt history customer. With a the of of. Part waya configured exploit exploit related these new leadership. It topic also sign the.
However, the finding in murine models needs cautious interpretation in humans due to disparity in subsets of T cells responding to viral vectored vaccines 52 , In conclusion, our current study has examined the kinetic expression of classic T RM markers VLA-1 and CD and further deciphered the role of VLA-1 integrin, in different phases of CD8 T cell responses following respiratory mucosal vaccination with a replication-defective viral vector TB vaccine.
We find VLA-1 to be expressed on viral vector vaccine-induced CD8 T cells before and after they trafficked to the lung and to play a differential role in various phases of T cell responses. These findings hold implications in understanding vaccine-inducible T RM in the lung and developing novel vaccination strategies against respiratory infectious diseases such as TB.
All animal experiments in this study were approved by the animal research ethics board of McMaster University, and were performed in accordance with the approved guidelines for animal experimentation at McMaster University.
A replication-deficient adenovirus expressing immunodominant Mycobacterium tuberculosis antigen Ag85A was used to immunize animals via either respiratory mucosal or parenteral route. Respiratory mucosal route of immunization was carried out by intranasal i. In some experiments, mice were immunized intramuscularly i. Then, mice were sacrificed by exsanguination. Airway luminal cells were collected through bronchoalveolar lavage BAL Lung mononuclear cells were isolated from perfused lungs as previously described Heparinized blood samples were treated twice with ACK lysis buffer Invitrogen, Burlington, ON, Canada to remove all red blood cells and washed with phosphate-buffered saline.
Ag-specific CD8 T cells were sorted from lung mononuclear cells using flow sorter. Cells were then washed and stained using cell surface mAbs. Then, cells were washed, permeabilized, and stained intracellularly. Intravascular immunostaining was carried out as previously described Briefly monoclonal anti-CD Within three minutes after injection, animals were sacrificed, and blood, BAL and lung were obtained for analysis. For each injection, the antibodies were administered intraperitoneally i.
Frequency of proliferating Ag—specific CD8 T cells in the lung was determined by in vivo Brdu incorporation assay as previously described A two-tailed Student t test was used for pairwise comparisons. Kaech, S. Effector and memory T-cell differentiation: implications for vaccine development.
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CD11a regulates effector CD8 T cell differentiation and central memory development in response to infection with Listeria monocytogenes. Infect Immun 81 , —, doi: Moreno-Layseca, P. Signalling pathways linking integrins with cell cycle progression. Matrix Biol 34 , —, doi: Ray, S. The collagen binding alpha1beta1 integrin VLA-1 regulates CD8 T cell-mediated immune protection against heterologous influenza infection. Immunity 20 , — Richter, M. J Immunol , — Purwar, R.
Resident memory T cells T RM are abundant in human lung: diversity, function, and antigen specificity. PLoS One 6 , e, doi: Conrad, C. Alpha1beta1 integrin is crucial for accumulation of epidermal T cells and the development of psoriasis. Nat Med 13 , —, doi: Neutra, M. Mucosal vaccines: the promise and the challenge. Nat Rev Immunol 6 , — Lycke, N. Recent progress in mucosal vaccine development: potential and limitations. Nat Rev Immunol 12 , —, doi: Afkhami, S. Methods and clinical development of adenovirus-vectored vaccines against mucosal pathogens.
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Replicating and non-replicating viral vectors for vaccine development. Curr Opin Biotechnol 18 , —, doi: Santosuosso, M. Mucosal luminal manipulation of T cell geography switches on protective efficacy by otherwise ineffective parenteral genetic immunization. Anderson, K. Intravascular staining for discrimination of vascular and tissue leukocytes. Nat Protoc 9 , —, doi: Woodworth, J.
Mucosal Immunol 10 , —, doi: Livak, K. Methods 25 , —, doi: Muller, G. Systemic immunoregulatory and pathogenic functions of homeostatic chemokine receptors. J Leukoc Biol 72 , 1—8 Regulation of inflammation by collagen-binding integrins alpha1beta1 and alpha2beta1 in models of hypersensitivity and arthritis. J Clin Invest , —, doi: Murine airway luminal antituberculosis memory CD8 T cells by mucosal immunization are maintained via antigen-driven in situ proliferation, independent of peripheral T cell recruitment.
Activation of CD8 T cells by mycobacterial vaccination protects against pulmonary tuberculosis in the absence of CD4 T cells. Seder, R. Vaccines against intracellular infections requiring cellular immunity. Nature , —, doi: Iijima, N. Tissue instruction for migration and retention of TRM cells.
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J Infect Dis , doi: Differentially imprinted innate immunity by mucosal boost vaccination determines antituberculosis immune protective outcomes, independent of T-cell immunity. Mucosal Immunol 6 , —, doi: Betts, M. During steady state monocytes form clusters in the collagen-rich subcapsular red pulp representing a reservoir and the major site for monocyte recruitment after inflammation Although our findings so far do not argue for VLA-1 as a spleen homing receptor, we further investigated R- and A-MDSC localization after injection within different areas of the spleen.
CD11b staining marks the red pulp and CD staining the marginal zone. Both injected cell types accumulated in the red pulp after 6 h. Among the remaining Teff moderate effects on proliferation and cell death could be detected, while the specific inhibitory measures were only partially dependent on VLA-1 expression by the A-MDSCs.
However, the speed with which A-MDSCs were able to exert some significant inhibitory and even killing effects on T cells within a time window of only 6 h after injection was highly remarkable. B Quantification of MDSC migration parameters were calculated after 60 min imaging using an inverted Confocal Laser Scanning Microscope and acquiring consecutive pictures in 4 different quadrants every 15 s. To test whether such differences could also appear in the spleen in vivo , we followed MDSC-T cell interactions by two-photon microscopy in living mice.
These data also demonstrate the technical feasibility of this approach despite the high density of erythrocytes. These data corroborate the in vitro findings that VLA-1 expression on A-MDSC is not required for homing, motility and migration but as a substrate to efficiently interact with activated T cells. After 1 h mice were subjected to live two-photon microscopy of the spleen. A contact zone white was created as a surface to highlight the interacting area between the two cell types.
The complete sequence of consecutive time points is shown to visualize the duration of the interaction, from its origin until its termination. The indicated parameters for cell motility and migration were analyzed by Imaris software. From the total amount of tracks, 91 VLA-1 is widely expressed on mesenchymal and immune cell types and less on epithelial cells.
It is known to transmit anti-apoptotic, proliferative and tissue retention signals to T cells but also to monocytes after binding to collagen We found by bioluminescence imaging and FACS analyses that many of our injected MDSCs reach the lung of healthy mice, however the second highest accumulation occurred in the spleen, but hardly any cells reached the lymph nodes or BM.
These data support the idea that a primary function of MDSCs is not to prevent T cell priming but to control Teff activity during chronic stages of diseases in the target organ and systemically when circulating through the splenic red pulp 20 , The splenic subcapsular red pulp represents a reservoir for monocytes that are mobilized as an emergency recruitment to inflammatory sites 8.
It has been observed that myeloid cells from the spleen can infiltrate tumor stroma to mediate suppressive functions on T cells 36 , The accumulation of MDSCs in the spleen has also been reported during trauma and sepsis and, remarkably, also in this report the infiltration occurred already 6 h after stress induction 38 , This rapid effect is similar to our 6 h time period required not only to detect A-MDSC and Teff in the spleen but also to show a suppressive and killing effects on T cells.
VLA-1 expression has been reported for monocytes before. This may indicate that both treatments can up-regulate VLA-1 on monocytes but in combination without an additional effect. Our data here indicate that elevated VLA-1 expression serves as another monocyte licensing marker. Functionally, VLA-1 may support the recruitment of monocytes to inflammatory sites such as by collagen XIII into fibrotic lesions 45 and after monocyte differentiation to macrophages their VLA-1 expression may block their exit from inflamed tissues by collagen IV signals The macrophage migration on collagen IV in chemotaxis assays was markedly inhibited by VLAdeficient macrophages 46 , suggesting that VLA-1 may serve myeloid cells as a homing receptor and coordinator of migration within tissues Here we show that motility and migration of A-MDSCs were not impaired on the low affinity binding substrate fibronectin or the high affinity binding substrate collagen IV in vitro and in vivo within the splenic red pulp, an area known to expose collagen IV 15 , VLA-1 expression on T cells has been described mainly for pathological situations such as the murine lung where it was increased after viral infection 21 , 48 or on Teff in the psoriatic epidermis of mice 49 , murine colitis 42 or human atherosclerotic plaques Thus, VLA-1 marks Th1 cells homing to inflamed or infected peripheral tissues.
Our data concur with this observation since our intravenously injected Teff stay at least for 6 to 24 h in the splenic red pulp and can be targets of suppression when encountering A-MDSCs. After adoptive transfer they continue to express Ki, as an indicator of ongoing proliferation. Since no further antigen was provided to the OT-II cells after injection in vivo , proliferation was only transient.
This immediate suppressive effect and a trend for apoptosis was partially dependent on the VLA-1 expression by the A-MDSCs, which correlated with the observed general loss of T cells in the spleen. Also, the effector markers CD44 and as a trend CD62L were reduced, potentially also as indicators of cell death. Notably, CD69 is also considered as a marker of resting tissue-resident T cells 53 , it is tempting to speculate if some of our in vitro activated and transferred OT-II Teff may have acquired a tissue-resident phenotype in the spleen and are then partially protected from apoptosis induction.
Since we found differences in the susceptibility of T cell suppression in vitro also here, it will be interesting for future work to investigate the susceptibility of MDSC suppression of different T cell subsets and effector stages in more detail in vivo. Prominent mechanisms include Agr and IDO-mediated metabolic starvation of T cells by preventing their arginine and tryptophan consumption, respectively These cells require other stimuli such as zymosan to up-regulate Arg-1 expression unpublished results.
In this study, we did not separately asses the in vivo mechanism of suppression employed by the in vitro generated and injected MDSCs. Thus, the data acquired represent mostly subcapsular red pulp areas. Therefore, our data may not allow extrapolation of our conclusions on deeper red pulp areas. However, the subcapsular areas are known reservoirs of monocytes 8. Teff are more susceptible to MDSC suppression in vitro and are specifically and very rapidly targeted by adoptively transferred A-MDSCs in the splenic subcapsular red pulp.
Although VLA-1 was mainly reported to serve as a homing receptor for T cells and monocytic cells, we found that the expression of VLA-1 on M-MDSCs was not required to mediate their motility or migration on fibronectin or collagen IV in vitro or their homing into the spleen. The raw data supporting the conclusions of this article will be made available by the authors, without undue reservation.
The animal study was reviewed and approved by Regierung von Unterfranken, AZ All authors contributed to the article and approved the submitted version. The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Myeloid-derived suppressor cells as regulators of the immune system. Nat Rev Immunol 9 3 — Coordinated regulation of myeloid cells by tumours. Nat Rev Immunol 12 4 — Identification of discrete tumor-induced myeloid-derived suppressor cell subpopulations with distinct T cell-suppressive activity. Blood 8 — Subsets of myeloid-derived suppressor cells in tumor-bearing mice. J Immunol 8 — Eur J Immunol 39 10 — Myeloid dendritic cell precursors generated from bone marrow suppress T cell responses via cell contact and nitric oxide production in vitro.
Eur J Immunol 35 12 — Blood Adv 1 14 — Bronte V, Pittet MJ. The spleen in local and systemic regulation of immunity. Immunity 39 5 — Heat-killed Mycobacterium tuberculosis prime-boost vaccination induces myeloid-derived suppressor cells with spleen dendritic cell-killing capability. JCI Insight 5 pii Hynes RO. Integrins: bidirectional, allosteric signaling machines. Cell 6 — VLA a T cell surface antigen which defines a novel late stage of human T cell activation.
Eur J Immunol 15 5 —8. Ben-Horin S, Bank I. The role of very late antigen-1 in immune-mediated inflammation. Clin Immunol 2 — Gardner H. Integrin alpha1beta1. Adv Exp Med Biol — The extracellular matrix of the spleen as a potential organizer of immune cell compartments. Semin Immunol 20 1 :4— Immuno-electron-microscopic localization of types III pN-collagen and IV collagen, laminin and tenascin in developing and adult human spleen.
Cell Tissue Res 1 — PloS One 5 7 :e Constitutive expression of CCR7 directs effector CD8 T cells into the splenic white pulp and impairs functional activity. J Immunol 5 —9. Differential localization of effector and memory CD8 T cell subsets in lymphoid organs during acute viral infection.
J Immunol 9 — Immune tolerance to tumor antigens occurs in a specialized environment of the spleen. Cell Rep 2 3 — The collagen binding alpha1beta1 integrin VLA-1 regulates CD8 T cell-mediated immune protection against heterologous influenza infection. Immunity 20 2 — Dorhoi A, Du N. Front Immunol Application of paclitaxel in low non-cytotoxic doses supports vaccination with melanoma antigens in normal mice.
J Immunotoxicol 9 3 — Myeloid-derived suppressor cells are bound and inhibited by anti-thymocyte globulin. Innate Immun 25 1 — Blood monocytes consist of two principal subsets with distinct migratory properties. Immunity 19 1 — Cancer Res 72 4 —
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