Dataset Information

Exploration on survived mice after sepsis and proteomic analy-sis on LPS-activated macrophages supports the regulation of sepsis hyper-inflammation by intravenous immunoglobulin

ABSTRACT: Because the immune regulation in survivor after sepsis (an immune dysregulation from severe infection) might be applied for treatment, survivors and moribund mice after cecal liga-tion and puncture (CLP) and in vitro experiments on macrophages were explored. Most of the parameters in survivors (5-days post-CLP) were normalized, except for the slightly increase in alanine transaminase, IL-10, lipopolysaccharide (LPS) and gut leakage (FITC-dextran assay), with the enhanced adaptive immunity; serum immunoglobulin (using serum protein electrophoresis) and activated immune cells in spleens (flow cytometry analysis). Then, a clue to surviving sepsis may be effective innate immunity regulation by adaptive immune responses. Indeed, soluble heat aggregated immunoglobulin (sHA-Ig, a representative of immune complex) in LPS-activated macrophages reduced supernatant cytokines and down-regulated proteins in sev-eral processes (using proteomic analysis). As a proof of concept, intravenous immunoglobulin (IVIG) attenuated sepsis severity in CLP mice as evaluated by serum creatinine, ALT, serum cy-tokines, spleen apoptosis (24 h post-CLP) and 48 h survival analysis. In conclusion, immuno-globulin may play a role in sepsis immune hyper-responsiveness. Despite the debate over IVIG's use in sepsis, adequate selection criteria for sepsis patients who may benefit the most from IVIG could lead to an increase use of this clinically viable treatment.

INSTRUMENT(S): Q Exactive

ORGANISM(S): Mus Musculus (mouse)

TISSUE(S): Cell Culture, Macrophage

SUBMITTER: Jiradej Makjaroen

LAB HEAD: Asada Leelahavanichkul

PROVIDER: PXD027471 | Pride | 2022-02-22

REPOSITORIES: Pride

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Publications

Enhanced Bacteremia in Dextran Sulfate-Induced Colitis in Splenectomy Mice Correlates with Gut Dysbiosis and LPS Tolerance.

Thim-Uam Arthid A Makjaroen Jiradej J Issara-Amphorn Jiraphorn J Saisorn Wilasinee W Wannigama Dhammika Leshan DL Chancharoenthana Wiwat W Leelahavanichkul Asada A

International journal of molecular sciences 20220131 3

Because both endotoxemia and gut dysbiosis post-splenectomy might be associated with systemic infection, the susceptibility against infection was tested by dextran sulfate solution (DSS)-induced colitis and lipopolysaccharide (LPS) injection models in splenectomy mice with macrophage experiments. Here, splenectomy induced a gut barrier defect (FITC-dextran assay, endotoxemia, bacteria in mesenteric lymph nodes, and the loss of enterocyte tight junction) and gut dysbiosis (increased Proteobacteri ...[more]

PMID: 35163596

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Project description:Sepsis is the most common cause of hospitalization worldwide. Millions of people survive sepsis each year and are at risk for rehospitalization and death. Pulmonary complications such as respiratory failure due to pneumonia and exacerbation of chronic respiratory disease are among the most common reasons for rehospitalization in sepsis survivors. In order to prevent additional morbidity and death in patients surviving sepsis, we must establish biomarkers to identify patients at risk for pulmonary complications and develop treatments. Late complications in sepsis survivors, particularly nosocomial infections, are proposed to occur through persistent immune reprogramming after sepsis known as immunoparalysis. However, pro-inflammatory immune reprogramming in the form of primed or enhanced responses to secondary stimuli has also been described and could directly contribute to tissue injury and death. Primed immune responses and their contribution to long-term sepsis complications remains understudied. We hypothesize that primed immune responses to inflammatory stimuli in the lung after sepsis are associated with pulmonary complications in survivors of sepsis. To this end, we developed a model of antibiotic treated sepsis induced by cecal ligation and puncture followed three weeks later by secondary challenge with intranasal lipopolysaccharide to induce inflammatory lung injury. We find that mice surviving sepsis have enhanced lung injury responses in the setting of an exaggerated proinflammatory immune response, including primed Ly6Chi monocyte Tnf expression. Using RNA sequencing, we identified derangements in lung gene expression after CLP prior to LPS administration which may mediate enhanced lung injury in this model. One potential mediator, S100A8/A9, was also found to be elevated in the circulation of human sepsis survivors for up to 180 days after sepsis. These findings validate our model and identify S100A8/A9 as one of many potential biomarkers and therapeutic targets for patients at risk for long-term pulmonary complications after sepsis. The role of S100A8/A9, monocyte priming, and other factors predisposing to enhanced lung injury responses and pulmonary complications after sepsis warrant further investigation in humans and mice.

Project description:Dysregulated cardiac function after sepsis is common in intensive care unit (ICU) and known to predict poor long-term outcome and increase mortality. Effective therapeutic strategies are largely lacking. Moreover, the pathological feature and the molecular mechanism underlying cardiac dysfunction induced by sepsis remain unclear. Here, by performing echocardiograms on rodents after induction of polymicrobial sepsis with cecum ligation and puncture (CLP), we assessed the temporal dynamics of left ventricular ejection fraction (LVEF) and a serial of hemodynamics parameters on animals at different time point after CLP. Intriguingly, the mean LVEF is comparable in mice induced by CLP and sham, whereas survivors post CLP had stable LVEF and non-survivors had markedly fluctuated LVEF at early phase of CLP induction, suggesting LVEF away from normal range is highly associated with mortality. Consistent with clinical observations of depressed, preserved or hyperdynamic LVEF in septic patients from data compiled using our ICU cohort and from other studies, CLP-induced mice fall into three groups based on LVEF measured at 24 hours after surgery: high LVEF (HEF, LVEF>=90%), low LVEF (LEF, LVEF<65%), and normal LVEF (NEF, 65%=<LVEF<90%). We performed genome-wide transcriptomic and proteomic profiling on left ventricle samples collected from three CLP groups and sham mice. By implementing pathway analysis, gene set enrichment and coexpression network analysis, we identified jointly and distinctively changed genes, proteins and biologically-essential processes and pathways in three CLP groups with different LVEF. Notably, transmission electron microscopy examination shows remarkable mitochondrial and sarcomere defects in three CLP groups with different phenotypes associated with LVEF variances. Together, this study systematically characterizes the molecular, morphological, and functional alterations in CLP-induced cardiac injury, serving as a framework for future research into pathology and molecular mechanism of sepsis-induced cardiomyopathy.

Dataset Information

Exploration on survived mice after sepsis and proteomic analy-sis on LPS-activated macrophages supports the regulation of sepsis hyper-inflammation by intravenous immunoglobulin

Publications

Enhanced Bacteremia in Dextran Sulfate-Induced Colitis in Splenectomy Mice Correlates with Gut Dysbiosis and LPS Tolerance.

Similar Datasets

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