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Lactobacillus Rhamnosus GG Treatment Improves Intestinal Permeability and Modulates Microbiota Dysbiosis in an Experimental Model of Sepsis

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Lactobacillus Rhamnosus GG Treatment Improves Intestinal Permeability and Modulates Microbiota Dysbiosis in an Experimental Model of Sepsis INTERNATIONAL JOURNAL OF MOleCular meDICine 43: 1139-1148, 2019 Lactobacillus rhamnosus GG treatment improves intestinal permeability and modulates microbiota dysbiosis in an experimental model of sepsis LUFANG CHEN, HANYU LI, JINYOU LI, YUE CHEN and YUNMEI YANG Department of Geriatrics, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang 310003, P.R. China Received August 21, 2017; Accepted May 3, 2018 DOI: 10.3892/ijmm.2019.4050 Abstract. Decrease of ‘health-benefiting’ microbes and energy harvest, including Firmicutes, intestinal barrier function increase of pathogenic bacteria (a condition termed dysbiosis) regulators, including Akkermansia, hepatic function regulators, in intensive care unit patients is considered to induce or aggra- including Coprococcus and Oscillospira, and obligate anaer- vate sepsis (gut-origin sepsis). Orally administered probiotics obes, including Prevotellaceae, decreased in septic mice. With have been effective in the prevention of nosocomial infections. LGG pretreatment, the sepsis-induced microbiota dysbiosis However, the mechanisms of probiotic-induced anti-infection was reversed. The present results elucidated the potential and anti-sepsis remain to be explored. In the present study, mechanism of LGG treatment in sepsis, by improving intestinal 4-week-old C57BL6 mice were orally administrated with permeability and modulating microbiota dysbiosis. Lactobacillus rhamnosus GG (LGG) or normal saline (control) 4 weeks prior to cecal ligation and puncture (CLP). A subset of Introduction the mice were sacrificed at 24 h post‑CLP, and the others were used for survival studies. Ileum tissues, blood and fecal samples Sepsis is one of the leading causes of mortality and morbidity were collected. The survival rate of septic mice pretreated with in children and adults (1). An altered gut microflora is always LGG was significantly improved compared with untreated present in patients with sepsis, which induces infective and mice. The levels of inflammatory cytokines were reduced in non-infective complications (2). In addition, intestinal epithe- LGG-pretreated septic mice. A decrease of colonic proliferation lium dysfunction and dysbiosis, induced by critical illnesses, and epithelial tight junctions and an increase of colonic apop- result in increased translocation of bacteria to the blood, which tosis were observed in control septic CLP+saline mice. LGG contributes to the adverse outcome of sepsis (3). pretreatment reversed the colonic proliferation, apoptosis and Probiotics are regarded as the living microorganisms, expression of tight junction proteins to the levels of the sham which, in adequate amounts, can bring health benefits to group. LGG pretreatment improved the richness and diversity of the host (4). Among them, the genera Lactobacillus and intestinal microbiota in septic mice. The principal coordinates Bifidobacterium are the most widely used (5). Up to date, analysis clustering plots revealed a significant separate clus- probiotics have been increasingly applied and studied in clin- tering in microbiota structure between three groups. Bacteria ical practice. It is believed that probiotics can reduce the risk associated with energy consumption, including Bacteroidetes, of disease (including diarrhea, allergic diseases and inflam- with opportunistic infection, including Proteobacteria, matory bowel disease) through competition for binding locus Staphylococcaceae and Enterococcaceae, lipopolysaccha- and nutrients with pathogens, producing bacteriocins to kill ride producers, including Enterobacteriaceae, and facultative pathogens, synthesizing IgA to modify immune responses and anaerobes, such as Bacteroidaceae and Erysipelotrichaceae, reducing inflammation by stimulating regulatory lymphocytes increased in septic mice. By contrast, bacteria associated with through interleukin (IL)-10 and transforming growth factor signaling (6-8). However, application of probiotics on sepsis has been limited due to the theoretical risk of aggravating bacteremia in patients with critical illnesses, although few data exist that support this concern (9). A previous study from our Correspondence to: Dr Yunmei Yang, Department of Geriatrics, group has previously reported that prophylactic administration First Affiliated Hospital, School of Medicine, Zhejiang University, 79 Qingchun Road, Hangzhou, Zhejiang 310003, P.R. China of a special probiotic bacterial species in a septic mouse model E-mail: [email protected] effectively reduced mortality (10). However, the underlying mechanisms by which probiotics alleviated the severity of Key words: Lactobacillus rhamnosus GG, cecal ligation and sepsis remains unclear. In order to get a better understanding puncture, sepsis, 16SrRNA, microbiota of the role that the gut microbiota serve in the process of sepsis, the present study performed a comprehensive analysis of the microbiota alterations during sepsis. 1140 CHEN et al: LGG REDUCES MORTALITY FROM SEPSIS BY REVERSING MICROBIOTA DYSBIOSIS In the past, the colonization patterns in septic patients were factor (TNF)-α, IL-22 and IL-2] was added. The ELISA investigated predominantly from culture-dependent studies. kits used were as follows: IL-6 (cat. no. CME0006-048), However, most of the intestinal bacteria are obligate or facul- IL-22 (cat. no. CME0033-048) IL-2 (cat. no. CME0001-048) tative anaerobic bacteria, which are technically challenging (Nuoyang Biotech) and TNF-α (cat no. ml002095; Shanghai to culture once exposed in oxygen (11). Therefore, previous Enzyme-linked Biotechnology Co., Ltd., Shanghai, China; studies merely confirm the absence or presence of specific http://www.mlbio.cn/). bacteria, without providing a global view of microbiota altera- The plate was incubated for 1 h at 37˚C and washed five tions during sepsis. Due to the development of bacterial 16S times. HRP-substrate goat anti-mouse IgG (cat. no. 31430; ribosomal DNA gene sequencing (12), the present study was 1:100; Invitrogen; Thermo Fisher Scientific, Inc., Waltham, able to decipher microbial diversity and reveal the alterations MA, USA) was then added and incubated for 15 min at 37˚C of the gut microbiota structure during sepsis. The present in the dark. The enzyme reaction was then stopped with study aimed to investigate the effects of probiotic LGG on the 50 µl stop solution and absorbance was measured at 450 nm. microbial diversity in septic mice, and to examine how this Concentrations of inflammatory factors were calculated using contributes to the prevention and reversion of sepsis. a standard curve generated by standard solution in different concentration. Serum levels of inflammatory factors are Materials and methods presented as pg/ml. Ethics statement. All procedures for animal care and use Histological analysis. Colon tissues were collected from were approved by the Animal Care Ethics Committee of the mice at 24 h post‑CLP operation and fixed in 10% formalin First Affiliated Hospital, Zhejiang University (Hangzhou, for 24 h. The fixed colon tissues were embedded in paraffin China). Four-week-old male C57BL6 mice were purchased and sectioned at 4 µm thickness. The sections were stained from Zhejiang University and housed in pathogen‑free animal with hematoxylin-eosin (H&E) for histological observation facilities under a standard 12-h light/dark cycle. Standard to examine the pathology of colon injury induced by CLP. mouse diet and water were given throughout the study. Immunohistochemistry staining for Ki67 and occludin were performed for measuring proliferation and tight junction Probiotic administration and cecal ligation and puncture formation between intestinal epithelial cells. For immunohis- (CLP) model. Four-week-old male C57BL6 mice (weight, tochemistry staining, the standard protocol was performed. 13.59±1.59 g) were administered daily by oral gavage with Briefly, sections were incubated with 3% H2O2 5 min at room 200 µl of LGG (2x109 CFU/ml, 2.9x107 CFU/g; Culturelle, temperature to eliminate the endogenous peroxidase activity, ConAgra Foods, Omaha, NE, USA; CLP+LGG group, n=23), and then blocked with 5% bovine serum albumin for 1 h at or normal saline (control sham group, n=20; CLP+saline 37˚C and then incubated with rabbit anti‑Ki67 polyclonal anti- group, n=18) 4 weeks prior to CLP. To establish the murine body (cat. no. PA5-19462; 1:100; Invitrogen; Thermo Fisher septic peritonitis model, the mice were anesthetized with Scientific, Inc.) or rabbit anti‑occludin polyclonal antibody (cat. isoflurane and bupivacaine: 3‑4% for induction and 1‑3% for no. 404700; 1:100; Invitrogen; Thermo Fisher Scientific, Inc.) maintenance. A 1 cm incision was made on the middle of at 4˚C overnight. This was followed by washing three times abdomen, and the cecum was exteriorized through the incision with PBS for 5 min each. The sections were incubated with carefully. In order to induce mid-grade sepsis, the cecum was horseradish peroxidase-conjugated mouse-anti-rabbit IgG ligated at middle of the bottom and distal pole of the cecum, secondary antibody (cat. no. 31464; 1:100; Invitrogen; Thermo and was punctured from mesenteric toward anti-mesenteric Fisher Scientific, Inc.) for 1 h at 37˚C. Colour was developed direction using a 23-gauge needle. A droplet of feces was with a 3,3'-diaminobenzidine kit (Nanjing KeyGen Biotech Co., extruded through the holes, and the cecum was relocated into Ltd., Nanjing, China) and microscopically examined with light the abdominal cavity. Finally, the fascia and skin
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