Differential Expression of SOCS1/SOCS3 Ratios in Virus-Infected Macrophage Cell Lines Nancy J. Bigley, Ph.D. Microbiology and Immunology Program, and Department.

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Differential Expression of SOCS1/SOCS3 Ratios in Virus-Infected Macrophage Cell Lines Nancy J. Bigley, Ph.D. Microbiology and Immunology Program, and Department of Neuroscience, Cell Biology, and Physiology ,College of Science and Mathematics and Boonshoft School of Medicine, Wright State University, Dayton, Ohio 2014

We previously noted that murine keratinocyte cell lines (HEL-301 7 PAM-212) PRODUCED large amounts of SOCS1 mRNA and protein following infection with HSV-1 or treatment with interferon-gamma (IFN-γ). In contrast, murine fibroblasts (l929) exhibited minimal increase in SOCS1 levels when treated with IFN- following infection with HSV-1 (Frey et al. 2009). An antiviral state was induced in fibroblasts but not in keratinocytes. This resistance of keratinocytes to IFN- corresponded to the hyperinduction of SOCS1 in these cells. The goal of the present study was to determine the effects of HSV-1 infection on morphology, CD14-CD86 expression, cell viability, and SOCS protein levels in polarized M1 and M2 macrophage cell lines (J774A.1 and RAW 264.7) during the first 24 hour of infection. For comparison we examined these responses against the monocyte-macrophage trophic Dengue virus (DENV2) in the RAW 264.7).

Murine Macrophage Cell Lines Viruses Herpes Simplex Virus-1 strain Syn 17+ (HSV-1) initially obtained from Dr. Nancy Sawtell, Children’s Hospital Medical Center, Cincinnati, OH was propagated on confluent monolayers of Vero cells. After 4-5 days post infection or when CPE was evident, the cells were spun down, supernatant was aliquoted and stored at -80⁰C. Virus was quantified by infecting Vero cell monolayers with different dilutions of virus and plaque forming units were counted to calculate volume required for 0.1 multiplicity of infection (MOI). Dengue Virus DENV serotype 2 (DENV-2) was provided by Dr. Eric M. Vela, Battelle Memorial Institute Research Center. DENV2 was propagated on Vero 76 cells. Briefly, Vero 76 cells grown in 100 mm petri dishes to a confluence of approximately 85% at 37 °C, were infected with DENV-2 for 5-6 days or until CPE was evident. Cells were then scraped and centrifuged at 1500 rpm to eliminate cell debris. The supernatant fluid was aliquoted and stored at −80°C until use. Dengue virus titers were determined by plaque assay on confluent monolayers of Vero 76 cells grown in 6-well plates Murine Macrophage Cell Lines 264.7 (ATCC TIB-71) and J774A.1 (TIB-67) cells lines were obtained from the American Type Culture Collection (ATCC) Manassas, VA.

DENV2 infection of RAW 264.7 macrophages at 3 days post infection

Macrophage Polarization Treatment CD86 SOCS1 M0 No treatment SOCS3 20 ng/mL IL-4 for 12-24 hours LPS (100 ng/mL) IFN-γ (20 ng/mL) for 12-24 hours M1 M2

J774A.1 Macrophages at 24 hours after polarization LPS & IFN-γ IL-4 J774A.1 Macrophages at 24 hours after polarization

Vacuolated M1 Macrophages M1 J774A.1 M1 RAW 264.7 Vacuolated M1 Macrophages

J774A.1 Macrophages Uninfected HSV-1-infected

RAW 264.7 Macrophages

J774A.1 Macrophages RAW264.7 Macrophages

Virus Treatment of Macrophages 2. 1. In order to accurately determine cell number and calculate MOI accurately: Cells were released from culture plate using a non-enzymatic dissociation reagent Cell count was taken using a TPP PCV cell counting tube, making it possible to calculate MOI accurately Release cells/centrifuge Count 4. 3. Add virus (0.1 MOI)/cytokines

Monocyte/Macrophage Markers Scavenger Receptors Membrane Glycoprotein CD14- LPS receptors CD206 macrophage mannose receptor (MMR) CD200R- expressed mainly on monocytes and neutrophils. Interaction between CD200R and CD200 limit and suppress macrophage-induced inflammatory damage. CD80 (B7.1) co-receptor on antigen –presenting cells (APCs) CD163- hemoglobin-haptoglobin receptor; expressed on both monocytes and macrophages   CD86 (B7.2) co-receptor on APSs

J774.1 macrophages polarized to M1 phenotype Stained with FITC-labeled anti- mouse CD14 Stained with brilliant violet 421 - labeled anti-mouse CD86

J774a.1 Murine Macrophages

Jaguin and colleagues recently used monocytes purified from the buffy coats of human peripheral blood cells to characterize phenotypic and genomic markers. generated macrophages from these primary human cells by treatment with M-CSF polarized them using the same inducers as used in the present study, LPS and IFN-γ to induce M1 phenotype and IL-4 to induce the M2 phenotype the cell membrane marker unique to M1 cells was CD80 (B7.1) CD200R expression was unique to the M2 polarized human macrophages As did we using M1 and M2 polarized murine macrophage cell lines (data not shown), they found that the mannose receptor CD 206 did not distinguish between M1 and M2 phenotypes of human macrophages.

Flow cytometry summary of SOCS1 and SOCS3 expression by uninfected and infected J774A.1 macrophage subpopulations Left Panel. Note Uninfected cells at 24 h after polarization. M1 cells expressed higher levels of SOCS1 than SOCS3 with a SOC1/SOCS3 ratio of 7:1. Right Panel. Virus-infected M1 cells expressed a SOCS1/SOCS3 ratio of 1:1 while M2-infected cells exhibited a SOCS1/SOCS3 ratio of 1:2

CD14/CD86 EXPRESSION IN RAW 264.7 Murine Macrophages

Ratios determined by Flow cytometry (J774a Ratios determined by Flow cytometry (J774a.1) and Western Blot (RAW 267.4)   J774.A RAW 264.7 Ratio M0 1:2 M0-HSV-1  1:2 M1* 7:1 1:3 M1-HSV-1 1:1 M2 M2-HSV-1 * Difference because of cell line or detection method,. Western Blot detects denatured antigenic fragments ; Flow cytometry detects native protein conformation. SOCS1:SOCS3 ratios in all DENV2-infected cells was 1:1.

Summation of Observations HSV-1 infection led to morphological differences in all 3 experimental groups HSV-1 infection decreased CD14/CD86 expression in all 3 experimental groups M1 macrophages did not show an up regulation of SOCS1 following virus challenge, however, SOCS3 levels were increased HSV-1-infected unpolarized (M0) J774A.1 cells exhibited significant increases in expression levels of native SOCS1

At 24 h after infection, M0 control and M2 cells showed greater virus yield than did the M1 cells, presumably reflecting the loss of viable M1 cells.

Does up regulation of SOCS3 expression in HSV-1-infected M1 macrophages over that seen in uninfected M1 cells reflect the effects of M1 polarization or suggest the cell’s attempt to counteract effects of proinflammatory molecules? Qasimi and colleagues showed that different domains of SOCS3 protein are used to mediate interleukin-10 (IL-10) inhibition of TNF-α and nitric oxide production by this same macrophage cell line (Qasimi and others 2006). In this same macrophage cell line (J774A.1) , Il-10 was responsible for the anti-inflammatory response to Borrelia burgdorferi (Dennis and others 2006). SOCS1/SOCS3 expression levels appeared relatively unchanged in virus-infected M2 macrophages when compared to their uninfected counterparts, suggesting microenvironment signals such as IL-4 play a greater role in SOCS expression levels than does HSV-1 infection. We then hypothesized that the HSV-1-infected J774A.1 M1 macrophages were attempting to counteract the effects of inflammatory molecules induced by polarization.

Structural domains of SOCS molecules Google Image Structural domains of SOCS molecules Note that only SOCS1 contains a nuclear localization sequence (NLS)

Overview of SOCS1 inhibition of cytokine-induced STATs

Pro-inflammatory and anti-inflammatory effects of SOCS3

p<0.001 when the SOCS1 groups were compared with the SOCS3 and pJAK2 groups LPS (100 ng/ml) IFN-γ (20 ng/ml) 0.1 MOI HSV-1 SOCS3 peptide or SOCS1 Inhibitor Incubate 24 hours Effects of SOCS1 and SOCS3 peptide mimetics and SOCS1 inhibitor (pJAK2) on polarized M1 J774A.1 macrophages.

Jo et al. (2005) used a recombinant cell-penetrating form of SOCS3 (CP-SCS3) to protect mice (C3H/HeJ) from the lethal effects of SEB and LPS by reducing production of inflammatory cytokines and attenuating apoptosis and hemorrhagic necrosis . Within 2 hours after injection, CP-SOCS3 was distributed In multiple organs and persisted for at least 8 hours The membrane-translocating motif (MTM) was composed of 12 amino acids from a hydrophobic signal sequence form fibroblast growth factor 4. The MTM was attached to either the N- terminal or C-terminal of SOCS3. Only these forms were capable of penetrating RAW cells. Based on these observations, we tested whether the SOCS3 peptide mimetic could modify the cytotoxicity of the M1 polarization treatment or virus infection. The peptide mimetics in this present study were provided by Dr. H.M. Johnson and his colleagues , University of Florida at Gainesville. These peptides contain an addition of a lipophilic group (palmitoyl-lysine) to the N terminus of the synthetic peptide which provides them with the ability to penetrate cells.

SOCS3 Peptide Mimetic protects macrophages (RAW 264 SOCS3 Peptide Mimetic protects macrophages (RAW 264.7) from the lytic effect of HSV-1 and from the lytic effect of M1 polarization P>0.03 P<0.03 P>0.03 SOC3 peptide (35μM/ml) or TC medium for 30 minutes prior to LPS (100 ng/ml) IFN-γ (20 ng/ml) 0.1 MOI HSV-1 Incubate 24 hours Cell Viabilities of RAW 264.7 macrophages 24 hours after M1 polarization

CONCLUSIONS S0CS3 peptide mimetic and the S0CS1 inhibitor (pJAK2) increased the viability of polarized M1 cells over SOCS1-treated M1 J 774A.1 macrophages similar to the observations in comparable cell groups infected with HSV-1 (p<0.001) Prediction: The anti-inflammatory effect in these cells will be characterized by increased levels of IL-10 SOCS1 peptide mimetic decreases the viability of polarized M1 cells and HSV-1-infected M1 J774A.1 macrophages (p<0.001) Prediction: The inflammatory effect in these cells will be characterized by increased levels of TNF-α. SOCS3 Peptide Mimetic protects macrophages (RAW 264.7) from the lytic effect of HSV-1 and from the lytic effect of M1 polarization These characterization are in progress at present.

Significance Benefits of SOCS3 Peptide Mimetic Neuro inflammation- already shown in microglial cells by Benveniste’s group (Qin et al, 2012). Anti-inflammatory effects in inflammatory diseases including viral diseases such as Dengue fever and autoimmune tissue destruction. Benefits of SOCS1 Peptide Mimetic Convert the M2-type macrophage in solid tumors to an inflammatory M1 phenotype

References Ahmed C M, Dabelic R, Waiboci L W, et al. 2009. SOCS-1 mimetics protect mice against lethal poxvirus infection: Identification of a novel endogenous antiviral system. J Virol 83:1402-1415. Frey K.G., Ahmed C.H.I., Dabelic R., et al. 2009. HSV-1-induced SOCS-1 expression in keratinocytes: Use of a SOCS-1 antagonist to block a novel mechanism of viral immune evasion. J Immunol 183: 1253-1262. Nowoslawski Akhtar L., and Benveniste E.N. 2011. Viral Exploitation of Host SOCS Protein Functions. J Virol 85: 1912-1921. Qin H., Yeh, W-I., De Sarno, P., et al. 2012a. Signal transducer and activator of transcription-3/suppressor of cytokine signaling-3 (STAT3/SOCS3) axis in myeloid cells regulates neuroinflammation. Proc Natl Acad Sci U S A 109 (13) 5004-5009.   Qin H., Holdbrooks A.T., Liu Y., et al. 2012b. SOCS3 deficiency promotes M1 macrophage polarization and inflammation. J Immunol 189: 3439-3448. Bigley NJ. 2014.  Complexity of Interferon- Interactions with HSV-1. Frontiers in Immunology/Immunotherapies and Vaccines. Feb 2014/vol 5/article 15. Reichard AC, Cheemarla NR, Bigley NJ. SOCS1/3 Expression Levels in HSV-1-Infected, Cytokine-Polarized and -Unpolarized Macrophages. J Interferon Cytokine Res. 2014 Jun 23. [Epub ahead of print] Jaguin M., Houlbert N., Fardel O., et al. 2013. Polarization profiles of human M-CSF-generated macrophages and comparison of M1 markers in classically activated macrophages from GM-CSF and MS origin. Cell Immunol 281:51-61.

Qasimi P. , Ming-Lum A. , Ghanipour A. , et al. 2006 Qasimi P., Ming-Lum A., Ghanipour A., et al. 2006. Divergent mechanisms utilized by SOCS3 to mediate interleukin-10 inhibition of tumor necrosis factor α and nitric oxide production by macrophages. J Biol Chem 281:6316-6324. Dennis V.A,. Jefferson A., Singh S.R., et al. 2006.Interleulin-10 anti-inflammatory response to Borrelia burgdorferi, the agent of Lyme Disease: a possible role for suppressor of cytokine signaling 1 and 3. Infect. Immun.. 74;5780-5789. Jo D., Danya l., Collins R.D., Hawiger J. 2005, intracellular protein therapy with SOCS3 inhibits inflammation and apoptosis. Nature Med. 11:892-898.

Acknowledgements Graduate Students Adam C. Reichard Nagarjuna Reddy Cheemarla Sarah Al Sharif Hind Albershi Kelley J. Williams University of Florida Colleagues contributing the SOCS peptides and inhibitor Drs. Howard M. Johnson, Chulbul M.I. Ahmed, and Joseph Larkin Dr. Barbara E. Hull, Director of the Microbiology and Immunology Program, Wright State University