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Toll-like receptor 3-mediated inflammation by p38 is enhanced by endothelial nitric oxide synthase knockdown.
Koch SR, Choi H, Mace EH, Stark RJ
(2019) Cell Commun Signal 17: 33
MeSH Terms: Capillary Permeability, Cells, Cultured, Chemokine CXCL10, Endothelium, Vascular, Gene Knockdown Techniques, Humans, Inflammation, Interleukin-6, Interleukin-8, Nitric Oxide Synthase Type III, Poly I-C, RNA, Small Interfering, Toll-Like Receptor 3, p38 Mitogen-Activated Protein Kinases
Show Abstract · Added April 17, 2019
BACKGROUND - Vascular dysfunction is commonly seen during severe viral infections. Endothelial nitric oxide synthase (eNOS), has been postulated to play an important role in regulating vascular homeostasis as well as propagation of the inflammatory reaction. We hypothesized that the loss of eNOS would negatively impact toll-like receptor 3 (TLR3) signaling and worsen vascular function to viral challenge.
METHODS - Human microvascular endothelial cells (HMVECs) were exposed to either control or eNOS siRNA and then treated with Poly I:C, a TLR3 agonist and mimicker of dsRNA viruses. Cells were assessed for protein-protein associations, cytokine and chemokine analysis as well as transendothelial electrical resistance (TEER) as a surrogate of permeability.
RESULTS - HMVECs that had reduced eNOS expression had a significantly elevated increase in IL-6, IL-8 and IP-10 production after Poly I:C. In addition, the knockdown of eNOS enhanced the change in TEER after Poly I:C stimulation. Western blot analysis showed enhanced phosphorylation of p38 in sieNOS treated cells with Poly I:C compared to siControl cells. Proximity ligation assays further demonstrated direct eNOS-p38 protein-protein interactions. The addition of the p38 inhibitor, SB203580, in eNOS knockdown cells reduced both cytokine production after Poly I:C, and as well as mitigated the reduction in TEER, suggesting a direct link between eNOS and p38 in TLR3 signaling.
CONCLUSIONS - These results suggest that reduction of eNOS increases TLR3-mediated inflammation in human endothelial cells in a p38-dependent manner. This finding has important implications for understanding the pathogenesis of severe viral infections and the associated vascular dysfunction.
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14 MeSH Terms
Endothelial nitric oxide synthase modulates Toll-like receptor 4-mediated IL-6 production and permeability via nitric oxide-independent signaling.
Stark RJ, Koch SR, Choi H, Mace EH, Dikalov SI, Sherwood ER, Lamb FS
(2018) FASEB J 32: 945-956
MeSH Terms: Capillary Permeability, Cells, Cultured, Chronic Disease, Endothelial Cells, Gene Expression Regulation, Enzymologic, Humans, Imidazoles, Interleukin-6, Lipopolysaccharides, MAP Kinase Signaling System, Nitric Oxide, Nitric Oxide Synthase Type III, Pyridines, Toll-Like Receptor 4, Vasculitis, p38 Mitogen-Activated Protein Kinases
Show Abstract · Added October 27, 2017
Endothelial dysfunction, characterized by changes in eNOS, is a common finding in chronic inflammatory vascular diseases. These states are associated with increased infectious complications. We hypothesized that alterations in eNOS would enhance the response to LPS-mediated TLR4 inflammation. Human microvascular endothelial cells were treated with sepiapterin or N-nitro-L-arginine methylester (L-NAME) to alter endogenous NO production, and small interfering RNA to knockdown eNOS. Alterations of endogenous NO by sepiapterin, and L-NAME provided no significant changes to LPS inflammation. In contrast, eNOS knockdown greatly enhanced endothelial IL-6 production and permeability in response to LPS. Knockdown of eNOS enhanced LPS-induced p38. Inhibition of p38 with SB203580 prevented IL-6 production, without altering permeability. Knockdown of p38 impaired NF-κB activation. Physical interaction between p38 and eNOS was demonstrated by immunoprecipitation, suggesting a novel, NO-independent mechanism for eNOS regulation of TLR4. In correlation, biopsy samples in patients with systemic lupus erythematous showed reduced eNOS expression with associated elevations in TLR4 and p38, suggesting an in vivo link. Thus, reduced expression of eNOS, as seen in chronic inflammatory disease, was associated with enhanced TLR4 signaling through p38. This may enhance the response to infection in patients with chronic inflammatory conditions.-Stark, R. J., Koch, S. R., Choi, H., Mace, E. H., Dikalov, S. I., Sherwood, E. R., Lamb, F. S. Endothelial nitric oxide synthase modulates Toll-like receptor 4-mediated IL-6 production and permeability via nitric oxide-independent signaling.
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16 MeSH Terms
Metabolic Effects of Diet and Exercise in Patients with Moderate to Severe CKD: A Randomized Clinical Trial.
Ikizler TA, Robinson-Cohen C, Ellis C, Headley SAE, Tuttle K, Wood RJ, Evans EE, Milch CM, Moody KA, Germain M, Limkunakul C, Bian A, Stewart TG, Himmelfarb J
(2018) J Am Soc Nephrol 29: 250-259
MeSH Terms: Adiposity, Aged, Albuminuria, Body Weight, Caloric Restriction, Creatinine, Exercise, F2-Isoprostanes, Female, Glomerular Filtration Rate, Humans, Interleukin-6, Male, Middle Aged, Oxidative Stress, Oxygen Consumption, Pilot Projects, Renal Insufficiency, Chronic
Show Abstract · Added October 24, 2017
CKD is steadily increasing along with obesity worldwide. Furthermore, obesity is a proinflammatory risk factor for progression of CKD and cardiovascular disease. We tested the hypothesis that implementation of caloric restriction and aerobic exercise is feasible and can improve the proinflammatory metabolic milieu in patients with moderate to severe CKD through a pilot, randomized, 2×2 factorial design trial. Of 122 participants consented, 111 were randomized to receive caloric restriction and aerobic exercise, caloric restriction alone, aerobic exercise alone, or usual care. Of those randomized, 42% were women, 25% were diabetic, and 91% were hypertensive; 104 started intervention, and 92 completed the 4-month study. Primary outcomes were a change from baseline in absolute fat mass, body weight, plasma F-isoprostane concentrations, and peak oxygen uptake (VO). Compared with usual care, the combined intervention led to statistically significant decreases in body weight and body fat percentage. Caloric restriction alone also led to significant decreases in these measures, but aerobic exercise alone did not. The combined intervention and each independent intervention also led to significant decreases in F-isoprostane and IL-6 concentrations. No intervention produced significant changes in VO, kidney function, or urine albumin-to-creatinine ratio. In conclusion, 4-month dietary calorie restriction and aerobic exercise had significant, albeit clinically modest, benefits on body weight, fat mass, and markers of oxidative stress and inflammatory response in patients with moderate to severe CKD. These results suggest healthy lifestyle interventions as a nonpharmacologic strategy to improve markers of metabolic health in these patients.
Copyright © 2018 by the American Society of Nephrology.
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18 MeSH Terms
Bone corticalization requires local SOCS3 activity and is promoted by androgen action via interleukin-6.
Cho DC, Brennan HJ, Johnson RW, Poulton IJ, Gooi JH, Tonkin BA, McGregor NE, Walker EC, Handelsman DJ, Martin TJ, Sims NA
(2017) Nat Commun 8: 806
MeSH Terms: Androgens, Animals, Cancellous Bone, Chondrocytes, Dihydrotestosterone, Estradiol, Female, Interleukin-6, Male, Mice, Inbred C57BL, Osteogenesis, Ovariectomy, Suppressor of Cytokine Signaling 3 Protein
Show Abstract · Added March 26, 2019
Long bone strength is determined by its outer shell (cortical bone), which forms by coalescence of thin trabeculae at the metaphysis (corticalization), but the factors that control this process are unknown. Here we show that SOCS3-dependent cytokine expression regulates bone corticalization. Young male and female Dmp1Cre.Socs3 mice, in which SOCS3 has been ablated in osteocytes, have high trabecular bone volume and poorly defined metaphyseal cortices. After puberty, male mice recover, but female corticalization is still impaired, leading to a lasting defect in bone strength. The phenotype depends on sex-steroid hormones: dihydrotestosterone treatment of gonadectomized female Dmp1Cre.Socs3 mice restores normal cortical morphology, whereas in males, estradiol treatment, or IL-6 deletion, recapitulates the female phenotype. This suggests that androgen action promotes metaphyseal corticalization, at least in part, via IL-6 signaling.The strength of long bones is determined by coalescence of trabeculae during corticalization. Here the authors show that this process is regulated by SOCS3 via a mechanism dependent on IL-6 and expression of sex hormones.
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A prospective study of immune and inflammation markers and risk of lung cancer among female never smokers in Shanghai.
Shiels MS, Shu XO, Chaturvedi AK, Gao YT, Xiang YB, Cai Q, Hu W, Shelton G, Ji BT, Pinto LA, Kemp TJ, Rothman N, Zheng W, Hildesheim A, Lan Q
(2017) Carcinogenesis 38: 1004-1010
MeSH Terms: Acute-Phase Proteins, Adult, Aged, Biomarkers, Biomarkers, Tumor, Case-Control Studies, Chemokine CX3CL1, Chemokines, China, Cytokines, Female, Humans, Inflammation, Lung Neoplasms, Middle Aged, Prospective Studies, Receptors, Interleukin-6, Risk Assessment, Smoking
Show Abstract · Added April 3, 2018
There is a paucity of data on risk factors for lung cancer among never smokers. Here, we have carried out the first large study of circulating inflammation markers and lung cancer risk among female never smokers in Shanghai. A study of 248 lung cancer cases in female never smokers and 263 controls was nested within the Shanghai Women's Health Study (n = 75221), matched by dates of birth and blood collection (mean follow-up time = 7.5 years). Prediagnostic plasma levels of 65 inflammation markers were measured using a Luminex bead-based assay. Odds ratios (ORs) were estimated with multivariable logistic regression. Nine of 61 evaluable markers were statistically significantly associated with lung cancer risk among never smoking Chinese women (P-trend across categories <0.05). Soluble interleukin-6 receptor [sIL-6R; highest versus lowest category OR = 2.37; 95% confidence interval (CI) 1.40-4.02) and chemokine (C-C motif) ligand 2/monocyte chemotactic protein 1; (OR = 1.62; 95% CI 0.94-2.80) were associated with an increased risk of lung cancer, whereas interleukin (IL)-21 (OR = 0.53; 95%CI 0.31-0.93), chemokine (C-X3-C motif) ligand 1/fractalkine (OR = 0.54; 95% CI 0.30-0.96), soluble vascular endothelial growth factor receptor 2 (sVEGFR2, OR = 0.45; 95% CI 0.26-0.76), sVEGFR3 (OR = 0.53; 95% CI 0.32-0.90), soluble tumor necrosis factor receptor I (OR = 0.49; 95% CI 0.29-0.83), IL-10 (OR = 0.60; 95% CI 0.34-1.05) and C-reactive protein (OR = 0.63; 95% CI 0.37-1.06) were associated with a decreased risk. sIL-6R remained significantly associated with lung cancer risk >7.5 years prior to diagnosis. Markers involved in various aspects of the immune response were associated with subsequent lung cancer risk, implicating inflammation in the etiology of lung cancer among female never smokers.
Published by Oxford University Press 2017.
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Associations between self-reported diabetes and 78 circulating markers of inflammation, immunity, and metabolism among adults in the United States.
Van Dyke AL, Lang Kuhs KA, Shiels MS, Koshiol J, Trabert B, Loftfield E, Purdue MP, Wentzensen N, Pfeiffer RM, Katki HA, Hildesheim A, Kemp TJ, Pinto LA, Chaturvedi AK, Safaeian M
(2017) PLoS One 12: e0182359
MeSH Terms: Aged, Biomarkers, C-Reactive Protein, Chemokines, Cross-Sectional Studies, Diabetes Mellitus, Energy Metabolism, Female, Humans, Inflammation, Interleukin-6, Logistic Models, Male, Middle Aged, Receptors, Interleukin-6, Self Report, United States
Show Abstract · Added August 15, 2017
Inflammation is increasingly thought to be associated with diabetes; however, only a few inflammation markers have been assessed concurrently in relation to history of diabetes. In the most comprehensive evaluation of inflammation markers and diabetes to date using a Luminex bead-based assay, we measured 78 inflammation-, immune-, and metabolic-related markers detectable in at least 10% of serum samples collected from participants from the Prostate, Lung, Colorectal and Ovarian Cancer (PLCO) screening trial (n = 1,814). At baseline, 6.6% (n = 120) of PLCO participants self-reported a history of diabetes. Cross-sectional associations between these markers and self-reported diabetes were assessed using weighted logistic regression adjusting for sex, smoking status, blood draw age and year, body mass index, and cohort sub-study. Including chemokines [C-C motif ligand (CCL) 19, CCL20, CCL21, C-X-C motif ligand (CXCL) 6, CXCL10, and CXCL11] and soluble cytokine and chemokine receptors [soluble (s) interleukin (IL) 6 receptor (R), soluble tumor necrosis factor receptor (sTNFR) 1, sTNFR2, and sIL-R2], ten inflammation-related markers, were nominally associated with diabetes (P<0.05). In addition to these associations, higher levels of insulin, gastric inhibitory polypeptide, and pancreatic polypeptide remained significantly associated with self-reported diabetes with a false discovery rate <5%, indicating that the assay was able to detect markers associated with diabetes. In summary, self-reported diabetes was nominally associated with circulating cytokines, chemokines, and soluble cytokine and chemokine receptors in the most expansive examination of diabetes and inflammation- and immune-related markers to date. These results highlight the need to explore in future prospective studies the role of inflammation markers in diabetes.
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17 MeSH Terms
Echocardiographic Pulmonary Artery Systolic Pressure in the Coronary Artery Risk Development in Young Adults (CARDIA) Study: Associations With Race and Metabolic Dysregulation.
Brittain EL, Nwabuo C, Xu M, Gupta DK, Hemnes AR, Moreira HT, De Vasconcellos HD, Terry JG, Carr JJ, Lima JA
(2017) J Am Heart Assoc 6:
MeSH Terms: African Americans, Age Factors, Blood Pressure, C-Reactive Protein, Cohort Studies, Coronary Artery Disease, Echocardiography, Echocardiography, Doppler, Ethnic Groups, European Continental Ancestry Group, Female, Humans, Hypertension, Hypertension, Pulmonary, Insulin Resistance, Interleukin-6, Intra-Abdominal Fat, Male, Metabolic Syndrome, Middle Aged, Overweight, Pulmonary Artery, Systole, Tissue Survival, Tomography, X-Ray Computed
Show Abstract · Added September 11, 2017
BACKGROUND - The determinants of pulmonary artery systolic pressure (PASP) are not fully understood. It is unknown whether racial differences in PASP exist or if other population characteristics are associated with pulmonary pressure in humans. We examined echocardiographically estimated PASP in the Coronary Artery Risk Development in Young Adults (CARDIA) study, a middle-aged, biracial community-based cohort.
METHODS AND RESULTS - At the CARDIA year-25 examination, 3469 participants underwent echocardiography, including measurement of tricuspid regurgitant jet velocity to estimate PASP. Clinical features, laboratory values, pulmonary function tests, and measurement of adipose depot volume were analyzed for association with PASP. PASP was estimated in 1311 individuals (61% female, 51% white). Older age, higher blood pressure, and higher body mass index were associated with higher PASP. Black race was associated with higher PASP after adjustment for demographics and left and right ventricular function (β 0.94, 95% CI 0.24-1.64; =0.009), but this association was no longer significant after further adjustment for lung volume (β 0.42, 95% CI -0.68 to 0.96; =0.74). Insulin resistance, inflammation (C-reactive protein and interleukin-6), and visceral adipose volume were independently associated with higher PASP after adjustment for relevant covariates. PASP rose with worsening diastolic function (ratio of early transmitral Doppler velocity to average mitral annular tissue Doppler velocity [E/e'] and left atrial volume index).
CONCLUSIONS - In a large biracial cohort of middle-aged adults, we identified associations among black race, insulin resistance, and diastolic dysfunction with higher echocardiographically estimated PASP. Further studies are needed to examine racial differences in PASP and whether insulin resistance directly contributes to pulmonary vascular disease in humans.
© 2017 The Authors. Published on behalf of the American Heart Association, Inc., by Wiley Blackwell.
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25 MeSH Terms
Cell-Based Systems Biology Analysis of Human AS03-Adjuvanted H5N1 Avian Influenza Vaccine Responses: A Phase I Randomized Controlled Trial.
Howard LM, Hoek KL, Goll JB, Samir P, Galassie A, Allos TM, Niu X, Gordy LE, Creech CB, Prasad N, Jensen TL, Hill H, Levy SE, Joyce S, Link AJ, Edwards KM
(2017) PLoS One 12: e0167488
MeSH Terms: Adjuvants, Immunologic, Adolescent, Adult, Antibodies, Viral, Antibody Formation, Antigen Presentation, Chemokine CXCL10, Dendritic Cells, Double-Blind Method, Female, Hemagglutination Inhibition Tests, Humans, Influenza A Virus, H5N1 Subtype, Influenza Vaccines, Influenza, Human, Interleukin-6, Killer Cells, Natural, Male, Middle Aged, Monocytes, Neutrophils, Systems Biology, Vaccination, Young Adult
Show Abstract · Added May 3, 2017
BACKGROUND - Vaccine development for influenza A/H5N1 is an important public health priority, but H5N1 vaccines are less immunogenic than seasonal influenza vaccines. Adjuvant System 03 (AS03) markedly enhances immune responses to H5N1 vaccine antigens, but the underlying molecular mechanisms are incompletely understood.
OBJECTIVE AND METHODS - We compared the safety (primary endpoint), immunogenicity (secondary), gene expression (tertiary) and cytokine responses (exploratory) between AS03-adjuvanted and unadjuvanted inactivated split-virus H5N1 influenza vaccines. In a double-blinded clinical trial, we randomized twenty adults aged 18-49 to receive two doses of either AS03-adjuvanted (n = 10) or unadjuvanted (n = 10) H5N1 vaccine 28 days apart. We used a systems biology approach to characterize and correlate changes in serum cytokines, antibody titers, and gene expression levels in six immune cell types at 1, 3, 7, and 28 days after the first vaccination.
RESULTS - Both vaccines were well-tolerated. Nine of 10 subjects in the adjuvanted group and 0/10 in the unadjuvanted group exhibited seroprotection (hemagglutination inhibition antibody titer > 1:40) at day 56. Within 24 hours of AS03-adjuvanted vaccination, increased serum levels of IL-6 and IP-10 were noted. Interferon signaling and antigen processing and presentation-related gene responses were induced in dendritic cells, monocytes, and neutrophils. Upregulation of MHC class II antigen presentation-related genes was seen in neutrophils. Three days after AS03-adjuvanted vaccine, upregulation of genes involved in cell cycle and division was detected in NK cells and correlated with serum levels of IP-10. Early upregulation of interferon signaling-related genes was also found to predict seroprotection 56 days after first vaccination.
CONCLUSIONS - Using this cell-based systems approach, novel mechanisms of action for AS03-adjuvanted pandemic influenza vaccination were observed.
TRIAL REGISTRATION - ClinicalTrials.gov NCT01573312.
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24 MeSH Terms
Plasma hepatocyte growth factor is a novel marker of AL cardiac amyloidosis.
Swiger KJ, Friedman EA, Brittain EL, Tomasek KA, Huang S, Su YR, Sawyer DB, Lenihan DJ
(2016) Amyloid 23: 242-248
MeSH Terms: Aged, Amyloidosis, Biomarkers, Cardiomyopathies, Cohort Studies, Diagnosis, Differential, Female, Galectin 3, Heart Failure, Systolic, Hepatocyte Growth Factor, Humans, Hypertrophy, Left Ventricular, Immunoglobulin Light Chains, Interleukin-6, Male, Middle Aged, Prealbumin, Registries, Survival Analysis, Vascular Endothelial Growth Factor A
Show Abstract · Added June 7, 2018
BACKGROUND - Cardiac amyloidosis is an infiltrative cardiomyopathy that is challenging to diagnose. We hypothesized that the novel biomarkers hepatocyte growth factor (HGF), galectin-3 (GAL-3), interleukin-6 (IL-6), and vascular endothelial growth factor (VEGF) would be elevated in cardiac amyloidosis and may be able to discriminate from non-cardiac systemic amyloidosis or other cardiomyopathies with similar clinical or morphologic characteristics.
METHODS - Patients were selected from the Vanderbilt Main Heart Registry according to the following groups: (1) amyloid light-chain (AL) cardiac amyloidosis (n = 26); (2) transthyretin (ATTR) cardiac amyloidosis (n = 7); (3) left ventricular hypertrophy (LVH) (n = 45); (4) systolic heart failure (n = 42); and (5) non-cardiac systemic amyloidosis (n = 7). Biomarkers were measured in stored plasma samples. Biomarkers' discrimination performance in predicting AL cardiac amyloidosis (i.e., Concordance index) was reported. A survival analysis was used to explore the relationship between HGF levels and mortality among AL cardiac amyloidosis patients.
RESULTS - HGF levels were markedly elevated in patients with AL cardiac amyloidosis (median = 622, interquartile range (IQR): 299-1228 pg/mL) compared with the other groups, including those with non-cardiac systemic amyloidosis (median = 134, IQR: 94-163 pg/mL, p < 0.001). HGF was not a specific marker for ATTR amyloidosis. Gal-3 was elevated in all groups with amyloidosis but could not differentiate between those with and without cardiac involvement. There was no difference in IL-6 or VEGF between those with AL cardiac amyloidosis compared to other groups (p = 0.13 and 0.057, respectively).
CONCLUSIONS - HGF may be a specific marker that distinguishes AL cardiac amyloidosis from other cardiomyopathies with similar clinical or morphologic characteristics. Further studies are necessary to determine whether HGF levels predict the likelihood of survival.
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Potentiation and tolerance of toll-like receptor priming in human endothelial cells.
Koch SR, Lamb FS, Hellman J, Sherwood ER, Stark RJ
(2017) Transl Res 180: 53-67.e4
MeSH Terms: Endothelial Cells, Extracellular Signal-Regulated MAP Kinases, Human Umbilical Vein Endothelial Cells, Humans, Immune Tolerance, Interferon Regulatory Factor-7, Interferons, Interleukin-6, Lipopeptides, Lipopolysaccharides, Nuclear Pore Complex Proteins, Phosphorylation, Poly I-C, RNA-Binding Proteins, Toll-Like Receptors, Up-Regulation
Show Abstract · Added August 28, 2016
Repeated challenge of lipopolysaccharide (LPS) alters the response to subsequent LPS exposures via modulation of toll-like receptor 4 (TLR4). Whether activation of other TLRs can modulate TLR4 responses, and vice versa, remains unclear. Specifically with regards to endothelial cells, a key component of innate immunity, the impact of TLR cross-modulation is unknown. We postulated that TLR2 priming (via Pam3Csk4) would inhibit TLR4-mediated responses while TLR3 priming (via Poly I:C) would enhance subsequent TLR4-inflammatory signaling. We studied human umbilical vein endothelial cells (HUVECs) and neonatal human dermal microvascular endothelial cells (HMVECs). Cells were primed with a combination of Poly I:C (10 μg/ml), Pam3Csk4 (10 μg/ml), or LPS (100 ng/ml), then washed and allowed to rest. They were then rechallenged with either Poly I:C, Pam3Csk4 or LPS. Endothelial cells showed significant tolerance to repeated LPS challenge. Priming with Pam3Csk4 also reduced the response to secondary LPS challenge in both cell types, despite a reduced proinflammatory response to Pam3Csk4 in HMVECs compared to HUVECs. Poly I:C priming enhanced inflammatory and interferon producing signals upon Poly I:C or LPS rechallenge, respectively. Poly I:C priming induced interferon regulatory factor 7, leading to enhancement of interferon production. Finally, both Poly I:C and LPS priming induced significant changes in receptor-interacting serine/threonine-protein kinase 1 activity. Pharmacological inhibition of receptor-interacting serine/threonine-protein kinase 1 or interferon regulatory factor 7 reduced the potentiated phenotype of TLR3 priming on TLR4 rechallenge. These results demonstrate that in human endothelial cells, prior activation of TLRs can have a significant impact on subsequent exposures and may contribute to the severity of the host response.
Copyright © 2016 Elsevier Inc. All rights reserved.
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16 MeSH Terms