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Short-Chain Fatty Acids Inhibit Staphylococcal Lipoprotein-Induced Nitric Oxide Production in Murine Macrophages

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Short-Chain Fatty Acids Inhibit Staphylococcal Lipoprotein-Induced Nitric Oxide Production in Murine Macrophages Immune Netw. 2019 Apr;19(2):e9 https://doi.org/10.4110/in.2019.19.e9 pISSN 1598-2629·eISSN 2092-6685 Original Article Short-chain Fatty Acids Inhibit Staphylococcal Lipoprotein-induced Nitric Oxide Production in Murine Macrophages Jeong Woo Park 1,†, Hyun Young Kim1,†, Min Geun Kim1, Soyoung Jeong1, Cheol-Heui Yun 2, Seung Hyun Han 1,* 1Department of Oral Microbiology and Immunology, DRI, and BK21 Plus Program, School of Dentistry, Seoul National University, Seoul 08826, Korea 2Department of Agricultural Biotechnology and Research Institute for Agriculture and Life Sciences, Seoul National University, Seoul 08826, Korea Received: Oct 24, 2018 ABSTRACT Revised: Feb 2, 2019 Accepted: Feb 8, 2019 Staphylococcus aureus, a Gram-positive pathogen, can cause severe inflammation in humans, *Correspondence to leading to various life-threatening diseases. The lipoprotein is a major virulence factor in S. Seung Hyun Han aureus-induced infectious diseases and is responsible for excessive inflammatory mediators Department of Oral Microbiology and such as nitric oxide (NO). Short-chain fatty acids (SCFAs) including butyrate, propionate, Immunology, DRI, and BK21 Plus Program, School of Dentistry, Seoul National University, and acetate are microbial metabolites in the gut that are known to have anti-inflammatory Building 86 (Room 304), 1 Gwanak-ro, effects in the host. In this study, we investigated the effects of SCFAs onS. aureus lipoprotein Gwanak-gu, Seoul 08826, Korea. (Sa.LPP)-induced NO production in mouse macrophages. Butyrate and propionate, but not E-mail: [email protected] acetate, inhibited Sa.LPP-induced production of NO in RAW 264.7 cells and bone marrow- derived macrophages. Butyrate and propionate inhibited Sa.LPP-induced expression of †Jeong Woo Park and Hyun Young Kim contributed equally to this work. inducible NO synthase (iNOS). However, acetate did not show such effects under the same conditions. Furthermore, butyrate and propionate, but not acetate, inhibited Sa.LPP-induced Copyright © 2019. The Korean Association of activation of NF-κB, expression of IFN-β, and phosphorylation of STAT1, which are essential Immunologists for inducing transcription of iNOS in macrophages. In addition, butyrate and propionate This is an Open Access article distributed under the terms of the Creative Commons induced histone acetylation at lysine residues in the presence of Sa.LPP in RAW 264.7 cells. Attribution Non-Commercial License (https:// Moreover, Sa.LPP-induced NO production was decreased by histone deacetylase (HDAC) creativecommons.org/licenses/by-nc/4.0/) inhibitors. Collectively, these results suggest that butyrate and propionate ameliorate the which permits unrestricted non-commercial inflammatory responses caused byS. aureus through the inhibition of NF-κB, IFN-β/STAT1, use, distribution, and reproduction in any and HDAC, resulting in attenuated NO production in macrophages. medium, provided the original work is properly cited. Keywords: Staphylococcus aureus, lipoproteins; Short-chain fatty acid; Nitric oxide; ORCID iDs HDAC inhibitors; Macrophage Jeong Woo Park https://orcid.org/0000-0002-8837-8045 Cheol-Heui Yun https://orcid.org/0000-0002-0041-2887 INTRODUCTION Seung Hyun Han https://orcid.org/0000-0001-9418-9278 Staphylococcus aureus is a Gram-positive pathogenic bacterium that can cause severe inflammation leading to septic shock and inflammatory bowel diseases1 ( ,2). TLR2 ligands of Conflict of Interest The authors declare no potential conflicts of Gram-positive bacteria (including S. aureus) are responsible for inducing severe inflammation interest. in the host cell (3). In S. aureus, lipoproteins and lipoteichoic acid (LTA) are well known TLR2 ligands responsible for inducing nitric oxide (NO) and/or proinflammatory cytokine https://immunenetwork.org 1/13 Inhibition of Staphylococcal Lipoprotein-induced NO by SCFAs Abbreviations production in macrophages (4,5). Many recent studies have suggested that the bacterial BMDM, bone marrow-derived macrophage; lipoprotein is a potent immunostimulator in macrophages (6,7). Wild-type and LTA- cDNA, complementary DNA; DMEM, deficient, but not lipoprotein-deficient,S. aureus induces NO production in macrophages Dulbecco's modified Eagle's medium; EKSA, ethanol-killed Staphylococcus aureus; (8). In addition, lipoprotein-deficientStreptococcus gordonii is less effective in inducing NO HDAC, histone deacetylase; iNOS, inducible production than wild-type or LTA-deficientS. gordonii in macrophages (6). Furthermore, nitric oxide synthase; LB, Luria-Bertani; wild-type, but not lipoprotein-deficient,S. aureus potently induces IL-8 induction in human LTA, lipoteichoic acid; MPN, mepenzolate intestinal epithelial cells (5) and osteoclast activation (9). bromide; MTT, 2,5-diphenyl-2H-tetrazolium bromide; NO, nitric oxide; PAMP, pathogen- NO is a small molecule that can regulate a variety of physiological functions such as innate associated molecular pattern; P-STAT1, phosphorylated STAT1; PTX, pertussis toxin; immune responses, vascular homeostasis, and neurotransmission (10). In mammalian Sa.LPP, Staphylococcus aureus lipoprotein; cells, inducible NO synthase (iNOS) can induce a micromolar level of NO by immune cell SAHA, suberoylanilide hydroxamic acid; SCFA, activation, which can evoke septic shock, autoimmune diseases, and chronic inflammatory short-chain fatty acid; TBS, Tris-buffered diseases (11). Excessive NO production by iNOS is observed in patients with septic shock saline; TBST, TBS containing 0.05% Tween 20; or inflammatory bowel diseases (12,13). NF-κB activation and type I IFN-mediated STAT1 TSA, trichostatin A phosphorylation are essential for iNOS expression in macrophages (14). In S. aureus, Author Contributions lipoprotein is the major cell wall component for inducing excessive NO production through Conceptualization: Park JW, Kim HY, Han TLR2-mediated iNOS induction in macrophages (8). Even though NO production induced SH; Investigation: Park JW, Kim HY, Kim MG; by S. aureus lipoprotein (Sa.LPP) is known to be detrimental to the host, little is known about Methodology: Park JW, Kim HY, Jeong S, Han SH; Supervision: Yun CH, Han SH; Writing - molecules that could potentially inhibit excessive inflammation. original draft: Park JW, Kim HY, Jeong S, Han SH; Writing - review & editing: Park JW, Kim Short-chain fatty acids (SCFAs) are metabolites produced by intestinal microbiota through HY, Kim MG, Jeong S, Yun CH, Han SH. fermentation of undigested carbohydrates and dietary fibers (15). Butyrate, propionate, and acetate are the predominant forms of SCFAs, which have anti-inflammatory properties (16,17). Butyrate has beneficial roles by having anti-inflammatory effects on diseases such as inflammatory bowel disease or sepsis (18,19). Furthermore, SCFAs regulate immune cell differentiation and function through the inhibition of histone deacetylase (HDAC) and activation of G protein-coupled receptors (20,21). SCFAs also downregulate NO production by IFN-γ through the inhibition of NF-κB and ERK signaling in macrophages (22). Although SCFAs have been suggested as anti-inflammatory molecules (23,24), it is not fully understood whether SCFAs regulate bacterial lipoprotein-mediated NO production in macrophages. In this study, we investigated whether SCFAs inhibit Sa.LPP-induced NO production in macrophages. MATERIALS AND METHODS Bacteria, reagents, and chemicals S. aureus RN4220 was kindly provided by Prof. Bok Luel Lee (Pusan National University, Busan, Korea). Luria-Bertani (LB) broth was purchased from LPS Solution (Daejeon, Korea). Dulbecco's modified Eagle's medium (DMEM) and fetal bovine serum (FBS) were purchased from Welgene (Gyeongsan, Korea) and Gibco (Burlington, ON, Canada), respectively. Recombinant murine M-CSF was obtained from CreaGene (Seongnam, Korea). Sodium acetate, sodium propionate, sodium butyrate, trichostatin A (TSA), suberoylanilide hydroxamic acid (SAHA), mepenzolate bromide (MPN), pertussis toxin (PTX), Triton X-114, octyl β-D-glucopyranoside, and thiazolyl blue tetrazolium bromide were purchased from Sigma-Aldrich Inc. (St. Louis, MO, USA). Anti-iNOS rabbit polyclonal IgG antibody was obtained from Upstate Biotechnology (Lake Placid, NY, USA). Anti-acetyl-histone H3 (Lys9) polyclonal antibody was purchased from Millipore (Billerica, MA, USA). Anti-STAT1 and -phosphorylated STAT1 (P-STAT1) rabbit polyclonal antibodies were purchased from Cell Signaling Technology (Beverly, MA, USA). Anti-β-actin mouse monoclonal antibody was https://immunenetwork.org https://doi.org/10.4110/in.2019.19.e9 2/13 Inhibition of Staphylococcal Lipoprotein-induced NO by SCFAs purchased from Santa Cruz Biotechnology (Santa Cruz, CA, USA). All other reagents were purchased from Sigma-Aldrich Inc. unless indicated otherwise. Preparation of ethanol-killed S. aureus (EKSA) Techniques used to prepare EKSA were previously described (25). Briefly, S. aureus was cultured in LB medium at 37°C to mid-log phase. The bacterial pellet was collected, incubated, and shaken with 70% ethanol in PBS at room temperature for 2 h. After washing twice with PBS, bacterial killing was confirmed by spreading on an LB-agar plate at 37°C for 48 h. No bacterial colonies were observed. Culture of RAW 264.7 cells RAW 264.7 (TIB-71) was obtained from the American Type Culture Collection (Manassas, VA, USA). The cells were cultured in DMEM supplemented with 10% FBS, penicillin (100 U/ml) and streptomycin (100 μg/ml) at 37°C in a humidified incubator with 5% CO2. Preparation of bone marrow-derived macrophages
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