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Cathelicidin-Related Innate Immunity Role The Journal of Immunology Lysozyme-Modified Probiotic Components Protect Rats against Polymicrobial Sepsis: Role of Macrophages and Cathelicidin-Related Innate Immunity1 Heng-Fu Bu,*† Xiao Wang,*† Ya-Qin Zhu,*‡ Roxanne Y. Williams,* Wei Hsueh,† Xiaotian Zheng,† Ranna A. Rozenfeld,‡ Xiu-Li Zuo,† and Xiao-Di Tan2*†‡ Severe sepsis is associated with dysfunction of the macrophage/monocyte, an important cellular effector of the innate immune system. Previous investigations suggested that probiotic components effectively enhance effector cell functions of the immune system in vivo. In this study, we produced bacteria-free, lysozyme-modified probiotic components (LzMPC) by treating the probiotic bacteria, Lactobacillus sp., with lysozyme. We showed that oral delivery of LzMPC effectively protected rats against lethality from polymicrobial sepsis induced by cecal ligation and puncture. We found that orally administrated LzMPC was engulfed by cells such as macrophages in the liver after crossing the intestinal barrier. Moreover, LzMPC-induced protection was associated with an increase in bacterial clearance in the liver. In vitro, LzMPC up-regulated the expression of cathelicidin-related antimicrobial peptide (CRAMP) in macrophages and enhanced bactericidal activity of these cells. Furthermore, we demonstrated that surgical stress or cecal ligation and puncture caused a decrease in CRAMP expression in the liver, whereas enteral admin- istration of LzMPC restored CRAMP gene expression in these animals. Using a neutralizing Ab, we showed that protection against sepsis by LzMPC treatment required endogenous CRAMP. In addition, macrophages from LzMPC-treated rats had an enhanced capacity of cytokine production in response to LPS or LzMPC stimulation. Together, our data suggest that the protective effect of LzMPC in sepsis is related to an enhanced cathelicidin-related innate immunity in macrophages. Therefore, LzMPC, a novel probiotic product, is a potent immunomodulator for macrophages and may be beneficial for the treatment of sepsis. The Journal of Immunology, 2006, 177: 8767–8776. evere sepsis is a serious and extremely costly medical potent anti-inflammatory mediators, which often results in the de- problem in the U.S. The disease develops in Ͼ750,000 sensitization of effector cells (such as phagocytes) and the devel- S people annually, and ϳ30% of them die (1, 2). It is often opment of immunosuppression. Both the excessive inflammation caused by infection of commensal bacteria derived from mucosal and the profound immunosuppression are major determinants to an or skin surfaces. In past decades, extensive efforts have been made adverse clinical outcome in sepsis. Furthermore, physiological to understand how microbes trigger the innate immune response to functions of cellular effectors of the innate immune system such as infections and the pathophysiology of sepsis (3, 4). We have macrophages/monocytes and neutrophils are altered in sepsis. learned that the innate immune system (including humoral and Recently, several investigations suggested that modulation of cellular components) is in a dynamic state during sepsis (reviewed immune cell function might be a novel therapeutic strategy for in Refs. 3, 5, and 6). The sepsis syndrome is associated with an attenuation of sepsis (7–12). initially overwhelming innate immune response, characterized by Cathelicidin is a protein stored in granules as inactive propep- unabated activation and release of proinflammatory mediators, i.e., tide precursors in polymorphonuclear leukocytes (PMN)3 and humoral effectors. Subsequently, the exaggerated systemic inflam- monocytes/macrophages (13–15). Upon stimulation, cathelicidin matory response is counterbalanced by a sustained expression of is released from phagocytes. After release, the C-terminal end of cathelicidin is processed into active peptides. It has been demon- strated that human and rodent phagocytes express a single cathe- *Molecular and Cellular Pathobiology Program, Children’s Memorial Research Cen- licidin peptide, namely, hCAP-18/LL-37 in humans and cathelici- ter, Children’s Memorial Hospital, Chicago, IL 60614; †Department of Pathology, din-related antimicrobial peptide (CRAMP) in rodents (16, 17). ‡ Feinberg School of Medicine, Northwestern University, Chicago, IL 60611; and De- hCAP-18/LL-37 and CRAMP are effective killers of a variety of partment of Pediatrics, Feinberg School of Medicine, Northwestern University, Chi- cago, IL 60611 bacteria, including Escherichia coli, Pseudomonas aeruginosa, Received for publication March 27, 2006. Accepted for publication October 4, 2006. and Staphylococcus aureus (14, 16–19). CRAMP has been shown The costs of publication of this article were defrayed in part by the payment of page to impair intracellular replication of pathogens (20). Apart from its charges. This article must therefore be hereby marked advertisement in accordance antimicrobial properties, hCAP-18/LL-37 has also been demon- with 18 U.S.C. Section 1734 solely to indicate this fact. strated to neutralize LPS and protect mice from LPS lethality (14, 1 This work was supported in part by Excellence in Academic Medicine Award from 18). CRAMP-deficient mice are susceptible to severe bacterial in- Illinois Department of Public Aid (to X.-D.T.), Grant R01DK064240 (to X.-D.T.) from National Institutes of Health, and Eloise and Warren Batts Investigator Chair (to fection (21). Administration of hCAP-18/LL-37 protects against X.-D.T.). X.-L.Z. is a visiting scholar supported by Department of Gastroenterology, sepsis in neonatal rats (22). Thus, cathelicidin-related peptides Qilu Hospital, Medical College of Shandong University, Jinan, Shandong, People’s Republic of China. 2 Address correspondence and reprint requests to Dr. Xiao-Di Tan, Molecular and 3 Abbreviations used in this paper: PMN, polymorphonuclear leukocyte; CRAMP, Cellular Pathobiology Program, Children’s Memorial Research Center, Children’s cathelicidin-related antimicrobial peptide; CLP, cecal ligation and puncture; DAPI, Memorial Hospital, 2300 Children’s Plaza, Box 217, Chicago, IL 60614. E-mail 4Ј,6Ј-diamidino-2-phenylindole; LzMEcC, lysozyme-modified E. coli component; address: [email protected] LzMPC, lysozyme-modified probiotic component; pAb, polyclonal Ab. Copyright © 2006 by The American Association of Immunologists, Inc. 0022-1767/06/$02.00 8768 REGULATION OF INNATE IMMUNE EFFECTOR BY PROBIOTIC COMPONENTS play an important role in the maintenance of protective innate min. Then it was cooled down to room temperature and centrifuged at immunity. 10,000 ϫ g for 30 min at 4°C. The supernatant (i.e., LzMPC or LzMEcC) Probiotics are nonpathogenic microorganisms, which confer was used in various in vivo experiments in the present study. In preps used for in vivo experiments, 1 ml of LzMPC contains probiotic components benefits to the host when administrated in sufficient amounts (23). derived from 109 bacteria. The LzMPC prep was gavaged to rats at a dose Previous studies have shown that oral administration of probiotics of 10 ml/kg. modulates intestinal immunity, improves the balance of the gut Preparation of preps for in vitro experiments. Fresh cultured bacteria (1 microflora, enhances the recovery of the disturbed gut mucosal g) were washed with PBS and digested with lysozyme (2 mg/ml) in PBS, barrier, and prevents microbial translocation (23, 24). Experimen- as described above. After the digestion, cells were processed for centrifu- gation at 7000 ϫ g for 30 min at 4°C. The supernatant was collected, and tal and clinical studies have provided evidence for the possible use cell pellets were discarded. To inactivate lysozyme, the supernatant was of probiotics in several inflammatory diseases, including inflam- boiled for 30 min. Then it was cooled down to room temperature and matory bowel disease, enteritis, diarrhea, and pancreatitis (24–27). centrifuged at 10,000 ϫ g for 30 min at 4°C. The supernatant was col- In addition, studies have shown that the protective effect of pro- lected, processed for column chromatography on a Detoxi-gel to remove ␮ biotics is not limited to the gut (24, 28, 29). However, enteral endotoxin from the prep, and then filtrated through a 0.2- m filter before applying to in vitro experiments. An aliquot of preps was routinely pro- delivery of intact probiotic bacteria has not been shown to prevent cessed for Limulus amebocyte lysate assay to ensure no contamination with sepsis. Although probiotics have been suggested to enhance natu- endotoxin. Our preliminary data showed that LzMPC prep activates mac- ral and acquired immunity, it is unclear whether their effects are rophages at a dose of 10 ␮l/ml. associated with cathelicidin-related innate immunity. There have been a few reports indicating that heat-killed probiotics or their Polymicrobial sepsis induced by cecal ligation cell wall fractions effectively enhance effector cell functions of the and puncture (CLP) immune system in vivo (30–32). Despite these promising results, The CLP procedure was modified from previously described protocols (36, the effect of probiotic components in the prevention and treatment 37). All surgical instruments were steam autoclaved. Male Sprague Dawley of sepsis has not been investigated. In this study, we sought to use rats (120–150 g) were purchased from Harlan Sprague-Dawley. They were anesthetized by i.p. injection of Nembutal (65 mg/kg) and placed under a probiotic bacteria treated in vitro with lysozyme, an enzyme break- heating lamp. A 2-cm midline incision was
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