Levels Of G-CSF Research Articles

Temperature Trajectory Subphenotypes Correlate With Immune Responses in Patients With Sepsis.

We recently found that distinct body temperature trajectories of infected patients correlated with survival. Understanding the relationship between the temperature trajectories and the host immune response to infection could allow us to immunophenotype patients at the bedside using temperature. The objective was to identify whether temperature trajectories have consistent associations with specific cytokine responses in two distinct cohorts of infected patients. Prospective observational study. Large academic medical center between 2013 and 2019. Two cohorts of infected patients: 1) patients in the ICU with septic shock and 2) hospitalized patients with Staphylococcus aureus bacteremia. Clinical data (including body temperature) and plasma cytokine concentrations were measured. Patients were classified into four temperature trajectory subphenotypes using their temperature measurements in the first 72 hours from the onset of infection. Log-transformed cytokine levels were standardized to the mean and compared with the subphenotypes in both cohorts. The cohorts consisted of 120 patients with septic shock (cohort 1) and 88 patients with S. aureus bacteremia (cohort 2). Patients from both cohorts were classified into one of four previously validated temperature subphenotypes: "hyperthermic, slow resolvers" (n = 19 cohort 1; n = 13 cohort 2), "hyperthermic, fast resolvers" (n = 18 C1; n = 24 C2), "normothermic" (n = 54 C1; n = 31 C2), and "hypothermic" (n = 29 C1; n = 20 C2). Both "hyperthermic, slow resolvers" and "hyperthermic, fast resolvers" had high levels of G-CSF, CCL2, and interleukin-10 compared with the "hypothermic" group when controlling for cohort and timing of cytokine measurement (p < 0.05). In contrast to the "hyperthermic, slow resolvers," the "hyperthermic, fast resolvers" showed significant decreases in the levels of several cytokines over a 24-hour period, including interleukin-1RA, interleukin-6, interleukin-8, G-CSF, and M-CSF (p < 0.001). Temperature trajectory subphenotypes are associated with consistent cytokine profiles in two distinct cohorts of infected patients. These subphenotypes could play a role in the bedside identification of cytokine profiles in patients with sepsis.

Multiplex Bead Array Assay of a Panel of Circulating Cytokines and Growth Factors in Patients with Albuminuric and Non-AlbuminuricDiabetic Kidney Disease.

A panel of cytokines and growth factors, mediating low-grade inflammation and fibrosis, was assessed in patients with type 2 diabetes (T2D) and different patterns of chronic kidney disease (CKD). Patients with long-term T2D (N = 130) were classified into four groups: no signs of CKD; estimated glomerular filtration rate (eGFR) <60 mL/min/1.73 m2 without albuminuria; albuminuria and eGFR ≥60 mL/min/1.73 m2; albuminuria and eGFR <60 mL/min/1.73 m2. Thirty healthy subjects were acted as control. Twenty-seven cytokines and growth factors were assessed in serum by multiplex bead array assay. Serum hs-CRP, urinary nephrin, podocine, and WFDC2 were measured by ELISA. Patients with T2D showed elevated IL-1Ra, IL-6, IL-17A, G-CSF, IP-10, MIP-1α, and bFGF levels; concentrations of IL-4, IL-12, IL-15, INF-γ, and VEGF were decreased. IL-6, IL-17A, G-CSF, MIP-1α, and bFGF correlated negatively with eGFR; IL-10 and VEGF demonstrated negative associations with WFDC2; no relationships with podocyte markers were found. Adjusted IL-17A and MIP-1α were predictors of non-albuminuric CKD, IL-13 predicted albuminuria with preserved renal function, meanwhile, IL-6 and hsCRP were predictors of albuminuria with eGFR decline. Therefore, albuminuric and non-albuminuric CKD in T2D patients are associated with different pro-inflammatory shifts in the panel of circulating cytokines.

Correction: Chronic Alcohol Ingestion Increases Mortality and Organ Injury in a Murine Model of Septic Peritonitis

[This corrects the article DOI: 10.1371/journal.pone.0062792.].

Predictive biomarkers for cytomegalovirus reactivation before and after immunosuppressive therapy: A single-institution retrospective long-term analysis of patients with drug-induced hypersensitivity syndrome (DiHS)/drug reaction with eosinophilia and systemic syndrome (DRESS)

ObjectivesCytomegalovirus (CMV) reactivation in patients with severe drug eruption on immunosuppressive therapy often leads to fulminant disease and even mortality, yet there are no biomarkers to accurately predict CMV reactivation either before or after immunosuppressive therapy. We aimed to assess whether patients who develop CMV reactivation (CMV-positive cases) have distinct immunological profiles from CMV-negative cases before and after immunosuppressive therapy. MethodsWe performed serial cytokine/chemokine and regulatory T cells (Tregs) assessments of 45 patients with drug-induced hypersensitivity syndrome (DiHS)/drug reaction with eosinophilia and systemic syndrome (DRESS) during a follow-up period of nearly three years after onset. ResultsElevated IL-8, IL-10, IL-12p40, IL-15, TNF-α, G-CSF, and MIP-1α levels at baseline were associated with later development of CMV reactivation, while after starting treatment, IL-10 and IL-15 levels were associated with the onset of CMV reactivation; the use of corticosteroids obscured the large differences in these cytokines at baseline. CMV-positive cases were found to have normal Tregs frequencies at baseline, while negative cases had elevated frequencies. Higher eotaxin, IL-10, and G-CSF levels and lower IL-12p40 levels at baseline might be used for predicting the development of lethal CMV disease. ConclusionsThe algorithm based on these results showed an accurate association with CMV reactivation.

Suppressing neutrophil-dependent angiogenesis abrogates resistance to anti-VEGF antibody in a genetic model of colorectal cancer

We tested cis-Apc Δ716 /Smad4 +/- and cis-Apc Δ716 /Smad4 +/- Kras G12D mice, which recapitulate key genetic abnormalities accumulating during colorectal cancer (CRC) tumorigenesis in humans, for responsiveness to anti-VEGF therapy. We found that even tumors in cis-Apc Δ716 /Smad4 +/- Kras G12D mice, although highly aggressive, were suppressed by anti-VEGF treatment. We tested the hypothesis that inflammation, a major risk factor and trigger for CRC, may affect responsiveness to anti-VEGF. Chemically induced colitis (CIC) in cis-Apc Δ716 /Smad4 +/- and cis-Apc Δ716 /Smad4 +/- Kras G12D mice promoted development of colon tumors that were largely resistant to anti-VEGF treatment. The myeloid growth factor G-CSF was markedly increased in the serum after induction of colitis. Antibodies blocking G-CSF, or its target Bv8/PROK2, suppressed tumor progression and myeloid cell infiltration when combined with anti-VEGF in CIC-associated CRC and in anti-VEGF-resistant CRC liver metastasis models. In a series of CRC specimens, tumor-infiltrating neutrophils strongly expressed Bv8/PROK2. CRC patients had significantly higher plasma Bv8/PROK2 levels than healthy volunteers and high plasma Bv8/PROK2 levels were inversely correlated with overall survival. Our findings establish Bv8/PROK2 as a translational target in CRC, in combination with anti-VEGF agents.

Abstract 994: Tumor NLRP3 drives melanoma progression and immunosuppression by IL-1b-mediated host pro-tumor effects

Abstract Introduction: Melanoma NLRP3 inflammasome activation is involved in tumor progression and melanoma-induced immunosuppression via IL-1β-mediated effect. Abstract: Melanoma-associated inflammation participates in the generation of a tumor permissive environment, which promotes tumor progression and metastasis. The pro-inflammatory cytokine IL-1β mediates several inflammatory diseases and the modulation of the immune system. In the context of malignancy, IL-1β is a validated target in mouse models of cancer, including melanoma, where the cytokine contributes to immunosuppression, angiogenesis, metastasis, and regulation of myeloid derived suppressor cells. In this study, we demonstrate that the NLRP3 inflammasome drives the maturation of the pro-inflammatory cytokine IL-1β in melanoma cells. Accordingly, analysis of melanoma biopsies (N=461) showed increased NLRP3 expression in the lesions which correlates with the IL-1β levels. In melanoma-bearing mice, NLRP3 inhibition with a clinically evaluated NLRP3 inflammasome inhibitor OLT1177 (dapansutrile), showed to decrease melanoma progression and tumor-induced inflammation reducing the circulating levels of IL-6, G-CSF, and VEGF compared to vehicle tumor-bearing mice. Analysis of myeloid-derived suppressor cell (MDSC) populations revealed that NLRP3 inflammasome inhibition was sufficient to prevent MDSCs expansion (both PMN-MDSCs and M-MDSCs), restoring the population to the non-tumor-bearing level. The effect observed on MDSCs in tumor-bearing mice following NLRP3 inhibition resulted in increased NK cells activation in primary tumors (Figure). These data establish a new correlation between IL-1β, NLRP3, melanoma-induced immunosuppression and tumor progression. Considering that NLRP3 inhibition resulted in decreased tumor-induced immune evasion as well as an increased tumoricidal immune response, we evaluated the effect of the addition of NLRP3 inhibition to checkpoint inhibition. Tumor bearing mice treated with OLT1177 and anti-PD-1 showed reduced tumor progression compared to the single-agent treatments. In conclusion, NLRP3 inflammasome inhibition was successful in preventing IL-1β processing in melanoma cells and tumor progression. These findings suggest that NLRP3 may represent a potential therapeutic target for melanoma. Citation Format: Carlo Marchetti, Isak Tengesdal, Charles Dinarello, Mayumi Fujita. Tumor NLRP3 drives melanoma progression and immunosuppression by IL-1b-mediated host pro-tumor effects [abstract]. In: Proceedings of the Annual Meeting of the American Association for Cancer Research 2020; 2020 Apr 27-28 and Jun 22-24. Philadelphia (PA): AACR; Cancer Res 2020;80(16 Suppl):Abstract nr 994.

Abstract 921: TLR5 agonists enhance anti-tumor immunity and overcome resistance to immune checkpoint therapy

Abstract Despite the success of immune checkpoint therapies (ICT) in achieving durable responses in subsets of cancer patients, not all patients respond to these types of therapies. Primary and adaptive resistance to immunotherapies present a considerable obstacle in achieving enhanced survival in a broader population of patients. Innate immune activators have been actively pursued for their antitumor potential. Herein, we report that a syngeneic 4T1 mammary carcinoma murine model for established highly refractory triple negative breast cancer showed enhanced survival when treated intra-tumorally with the TLR5 agonist flagellin, in combination with intra-peritoneal antibodies targeting CTLA-4 and PD-1. Long-term survivor mice showed immunologic memory upon tumor re-challenge and a distinctive immune activating cytokine profile that engaged both innate and adaptive components of the immune system. Of note, low serum levels of G-CSF at weeks 6 and 7 correlated highly with enhanced survival at week 18 (Hazzard Ratio 11, p &amp;lt; 0.01, n=11). Furthermore, we also observed enhanced survival with combination TLR5 agonist plus ICT in the poorly immunogenic B16-F10 melanoma tumor model. Combination immune checkpoint therapy plus innate immune activation with TLR5 agonists may offer a new therapeutic strategy to treat ICT-refractory solid tumors. Citation Format: Caleb Gonzalez, Sarah Williamson, Seth Gammon, David Piwnica-Worms. TLR5 agonists enhance anti-tumor immunity and overcome resistance to immune checkpoint therapy [abstract]. In: Proceedings of the Annual Meeting of the American Association for Cancer Research 2020; 2020 Apr 27-28 and Jun 22-24. Philadelphia (PA): AACR; Cancer Res 2020;80(16 Suppl):Abstract nr 921.

Protective Role of Cerebrospinal Fluid Inflammatory Cytokines in Patients with Amnestic Mild Cognitive Impairment and Early Alzheimer's Disease Carrying Apolipoprotein E4 Genotype.

Neuroinflammatory cytokines can play a pivotal role in Alzheimer's disease (AD) contributing to the evolution of degenerative processes. We aimed at evaluating the levels of cerebrospinal fluid (CSF) inflammatory cytokines, chemokines, and growth factors in subjects with diagnosis of amnestic mild cognitive impairment and mild AD. We evaluated CSF contents of inflammatory cytokines in 66 patients divided according to the NIA-AA research framework and the APOE genotype. CSF of a group of cognitively unimpaired individuals (n = 23) was evaluated as control. All patients were evaluated for 24 months using Mini-Mental State Examination (MMSE). We found significant increased levels of IL-4, IL-6, IL-8, and G-CSF in the CSF of A+/T-APOE4 carriers, respect to A+/T-patients homozygous for APOE3, respect to A+/T+ patients, regardless the APOE status, and respect to controls. Over a period of 24 months, A+/T-APOE4 carriers, with increased levels of cytokines, showed a preserved cognitive evaluation when compared to the other subgroups of patients (delta MMSE at 24 months respect to baseline: 0.10±0.35; p < 0.05). Our data suggest that during early phases of AD, in APOE4 carriers, Aβ pathology likely induces a specific cytokines pattern synthesis associated to cognitive preservation. These data highlight the different role that neuroinflammation can play in AD pathology based on the presence of specific CSF biomarkers and on the APOE status.

Role of inflammatory markers in corona virus disease (COVID-19) patients: A review.

In late 2019, a novel virus called SARS-CoV-2, expanded globally from Wuhan, China and was declared a pandemic on 11 March 2020 by the WHO. The mechanism of virus entry inside the host cell depends upon the cellular proteases including cathepsins, HAT, and TMPRSS2, which splits up the spike protein and causes further penetration. MERS coronavirus uses DPP4, while coronavirus HCoV-NL63 and SARS-CoV and SARS-CoV-2 employ ACE-2 as the key receptor. Cytokine storm syndrome was analyzed in critically ill nCOVID-19 patients and it is presented with high inflammatory mediators, systemic inflammation, and multiple organ failure. Among various inflammatory mediators, the level of interleukins (IL-2, IL-7, IL-10), G-CSF, MIP1A, MCP1, and TNF-α was reported to be higher in critically ill patients. Understanding this molecular mechanism of ILs, T cells, and dendritic cells will be helpful to design immunotherapy and novel drugs for the treatment of nCOVID-19 infection.

MiR-520a-3p regulates the signaling pathway of cytokine secretion in cervical cancer

To investigate the molecular mechanism of miR-520a-3p regulating the secretion of cytokines in cervical cancer. The matching between miR-520a-3p and the NF-κB complex subunit RELA was analyzed by TargetScanHuman, and then the luciferase reporting system was used to detect whether miR-520a-3p targeted the NF-κB complex subunit RELA. After cervical cancer HELA cells stimulated by LPS, in the overexpression group or the knockout group, miR-520a-3p mimics or inhibitor were mixed with transfection reagent and dripped into HELA cells. The expression levels of colony stimulating factor (GCSF), granulocyte-macrophage colony stimulating factor (GM-CSF), interleukin 2 (IL-2), interleukin 3 (IL-3), interleukin 4 (IL-4), interleukin 5 (IL-5), interleukin 6 (IL-6), interleukin 19 (IL-9), interleukin 10 (IL-10), interleukin 12 p40 (IL-12 p40), interleukin 12 p70 (IL-12 p70), interleukin 13 (IL-13), interleukin 17 (IL-17), interferon gamma (IFN-γ), monocyte chemoattractant protein-1 (MCP-1), monocyte chemoattractant protein-5 (MCP-5), small inducible cytokine A5 (RANTES), tumor necrosis factor-alpha (TNFα) were detected by enzyme-linked immunosorbent assay in both the overexpression group and the knockout group. Each experiment was repeated three times. miR-520a-3p targeted the 3'UTR of RELA. After activation of the NF-κB signaling pathway by lipopolysaccharide (LPS), the protein expression levels of cytokines GCSF, GM-CSF, IL-2, IL-3, IL-4, IL-5, IL-6, IL-9, IL-10, IL-12 p40, IL-12 p70, IL-13, IL-17, IFN-γ, MCP-1, MCP-5, RANTES, TNFα secreted by HELA cells of cervical cancer were increased significantly (P＜0.05). In the overexpression group, the protein expression level of RELA of NF-κB complex subunit was decreased, and the protein expression level of the above-mentioned cytokines secreted by HELA cells of cervical cancer were decreased (P＜0.05). In the knockdown group, the protein expression level of RELA, a subunit of NF-κB complex, and the protein expression level of the above-mentioned cytokines secreted by HELA cells of cervical cancer were increased (P＜0.05). miR-520a-3p inhibits cytokine secretion in HELA cells of cervical cancer by targeting RELA, a key molecule in the NF-κB signaling pathway.

Serum Cytokine and Chemokine Profile in Relation to the Severity of Coronavirus Disease 2019 in China.

Coronavirus disease 2019 (COVID-19) is an emerging infectious disease caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). We investigated the serum cytokine and chemokine levels in asymptomatic, mild, moderate, severe, and convalescent SARS-CoV-2–infected cases. Proinflammatory cytokine and chemokine production induced by SARS-CoV-2 were observed not only in symptomatic patients but also in asymptomatic cases, and returned to normal after recovery. IL-6, IL-7, IL-10, IL-18, G-CSF, M-CSF, MCP-1, MCP-3, IP-10, MIG, and MIP-1α were found to be associated with the severity of COVID-19. Moreover, a set of cytokine and chemokine profiles were significantly higher in SARS-CoV-2–infected male than female patients. The serum levels of MCP-1, G-CSF, and VEGF were weakly and positively correlated with viral titers. We suggest that combinatorial analysis of serum cytokines and chemokines with clinical classification may contribute to evaluation of the severity of COVID-19 and optimize the therapeutic strategies.

Pilot study of cytokine changes evaluation after fecal microbiota transplantation in patients with ulcerative colitis

AimsTo evaluate the changes of serum cytokines levels after fecal microbiota transplantation (FMT) in patients with active ulcerative colitis (UC) and the correlation with UC disease activity. MethodsPatients with active UC who meet the inclusion and exclusion criteria were recruited, and received FMT from a single donor for three times with an interval of 2–3 months. Serum samples were collected before every FMT. Clinical responses to FMT were assessed according to the criteria of Mayo score. 41 serum cytokines, C-reactive protein (CRP) and erythrocyte sedimentation rate (ESR) were quantitatively detected. Changes in serum cytokines levels after FMT and their correlation with CRP, ESR and Mayo scores were investigated. Results16 active UC patients were enrolled, and 14(87.5%) patients achieved clinical response to FMT. Compared with those before FMT, serum concentrations of IL-1Ra, IL-6, IP-10 and ENA-78 decreased significantly after the second FMT (P < 0.05), and serum concentrations of MEC, VCAM-1 and G-CSF decreased significantly after both the first and second FMT (P < 0.05). Serum levels of IL-6, IL-1Ra and VCAM-1 were all significantly positively correlated with CRP and ESR. Serum level of IP-10 was significantly positively correlated with CRP, ESR and Mayo score. Serum level of G-CSF was significantly positively correlated with Mayo score. ConclusionsFMT may play a therapeutic role partly through modulating the host immune response. IL-6, IL-1Ra, IP-10, VCAM-1 and G-CSF may be biomarkers to evaluate the effect of FMT on UC.

251-OR: Cardiac Autoantibodies (AB) Predict Cardiovascular Disease (CVD) in T1D and Are Associated with Cytokine Signatures Linked to CVD Risk

CVD is the leading cause of mortality in T1D; however, only ∼50% of this risk is explained by traditional risk factors. Recent studies show that subjects with T1D in the DCCT developed cardiac autoimmunity, defined by the presence of ≥2 Ab. We tested the hypothesis that some of the unexplained CVD risk in T1D is mediated by Ab-linked cytokine pathways. We measured Ab in serum from 892 post-DCCT EDIC subjects (mean age 49 and T1D duration 28 years), with no CVD events at baseline (Figure). Cumulative incidence of a first CVD event in subjects with 0, 1, and &amp;gt;2 Ab was 2.0%, 8.9%, and 43%, respectively, over 4-year median follow-up. In Cox regression models, ≥2 Ab predicted CVD events with minimal attenuation by known risk factors. Using a 42-plex array to measure baseline serum cytokines in subjects with ≥2 Ab and matched controls without Ab, the ≥2 Ab group showed 3.4-fold odds (95% CI, 1.6-6.1; P &amp;lt; 0.0001)of having a 1 tertile increase in a proinflammatory component comprising IFN-γ, TNF-α, G-CSF, MDC, IL1-RA, IL-8, and EGF. Risk of CVD events was also independently associated with IFN-γ, TNF-α, and G-CSF levels (HR, 5.4; 95% CI, 1.5-18.9; P = 0.009). In conclusion, in this cohort with longstanding T1D, cardiac Ab identified subjects at high risk for CVD events, potentially through Ab-linked cytokine pathways. These findings raise the possibility to immunologically predict and prevent CVD in T1D. Disclosure G.R. Sousa: None. M. Niewczas: None. M.A. Lipes: None. Funding National Institutes of Health (DK1036909)

2149-PUB: The Changes in the Panel of Circulating Cytokines Associated with Chronic Kidney Disease in Patients with Type 2 Diabetes

Aim: To estimate the differences in the panel of circulating cytokines mediating low-grade inflammation and fibrosis in patients with type 2 diabetes (T2D) and chronic kidney disease.Methods: We examined 130 patients with T2D duration ≥10 years. Among them, 65 individuals had reduced estimated glomerular filtration rate (eGFR; 15-59 ml/min/1.73 m2) and 64 patients had increased albuminuria. Thirty healthy subjects were acted as control. Serum IL-1β, IL-1ra, IL-2, IL-4, IL-5, IL-6, IL-7, IL-8, IL-9, IL-10, IL-12 (p70), IL-13, IL-15, IL-17A, bFGF, eotaxin, G-CSF, GM-CSF, IFN-γ, IP-10, MCP-1, MIP-1α, MIP-1β, PDGF-BB, RANTES, TNF-α, and VEGF were assessed by multiplex analysis. Urinary nephrin and podocin, as podocyte injury markers, and WFDC-2, a marker of tubulointerstitial fibrosis, were assessed by ELISA. Results: Patients with T2D and reduced eGFR had increased levels of IL-1ra, IL-8, IL-13 and decreased IL-7, IL-9 and IL-15 concentrations when compared to those with preserved renal function and control (all p&amp;lt;0.05). Excretion of WFDC-2, but not podocyte markers, was increased in these patients (p≤0.02). The elevation of albuminuria was associated with enhanced excretion of nephrin and podocin (p&amp;lt;0.0001), but no differences were found in the levels of all measured cytokines between patients with normal and elevated albuminuria. The levels of IL-2, IL-4, IL-5, IL-17A, bFGF, G-CSF, IP-10 and MIP-1α correlated negatively with eGFR. No correlations were found between measured cytokines and glomerular markers. There was positive correlation between WFDC-2 and MIP-1α. The levels of IL-10 and IL-15, two anti-inflammatory cytokines, correlated negatively with WFDC-2. Conclusion: The obtained results demonstrate that decreased eGFR and increased urinary excretion of WFDC-2, a marker of tubulointerstitial fibrosis, are associated with a predominance of pro-inflammatory and fibrogenic molecules in the panel of circulating cytokines in T2D subjects. Disclosure A.I. Korbut: None. O. Fazullina: None. V. Klimontov: None.

Shuxuening injection facilitates neurofunctional recovery via down-regulation of G-CSF-mediated granulocyte adhesion and diapedesis pathway in a subacute stroke mouse model

Post-stroke neural damage is a serious health concern which does not yet have an effective treatment. We have shown previously that Shuxuening injection (SXNI), a Ginkgo biloba extract-based natural medicine, protects brain after an acute ischemic stroke, but its efficacy for post-stroke recovery is not known. This study was to investigate whether SXNI can improve the prognosis of stroke at a subacute phase. Mice with cerebral ischemia-reperfusion injury (CIRI) were established by middle cerebral artery occlusion (MCAO), and drugs or saline were injected by the tail vein every 12 h after reperfusion. The therapeutic effect of SXNI was evaluated by survival rate, modified neurologic severity scores (mNSS), open-field test, locomotive gait patterns, cerebral infarction volume, brain edema and histopathological changes. Subsequently, a combined method of RNA-seq and Ingenuity® Pathway Analysis (IPA) was performed to identify key targets and pathways of SXNI facilitating the prognosis of stroke in mouse brain. The results of the transcriptome analysis were verified by real time reverse transcription-polymerase chain reaction (RT-PCR), enzyme-linked immunosorbent assay (ELISA), western blot (WB) and immunohistochemistry (IHC). The experimental results showed that in the new subacute stroke model, SXNI markedly improves the survival rate, neurological and motor functions and histopathological changes, and significantly reduces cerebral infarction and edema volume. RNA-seq analysis of subacute stroke mice with or without SXNI (3 mL/kg) indicated 963 differentially expressed genes (DEGs) with a fold change ≥ 1.5 and a P-value ≤ 0.01. IPA analysis of DEGs showed that granulocyte adhesion and diapedesis ranked first in the pathway ranking, and the most critical gene regulated by SXNI was G-csf. Simultaneously, RT-PCR, ELISA, WB and IHC results demonstrated that SXNI not only obviously reduced the mRNA expression levels of key genes G-csf, Sele and Mac-1 in this pathway, but also significantly decreased the protein expression levels of G-CSF in serum and E-selectin and MAC-1 in brain tissues. In summary, our research suggested that SXNI can exert a remarkable neurofunctional therapeutic effect on stroke mice via down-regulating G-CSF to inhibit granulocyte adhesion and diapedesis. This study provides experimental evidence that SXNI may fulfill the need for stroke medicine targeting specifically at the recovery stage.

Serum Cytokines are regulated in African Americans with High HbA1c

Abstract Background Low grade inflammation is associated with T2D resulting from a cadre of serum cytokines. IL3, IL4, IL7, IL-17A, GM-CSF, and GM-CSF play a coordinated pathogenic role in many inflammatory diseases. It has been previously reported high circulating HbA1c influences serum cytokine levels and cholesterol metabolism. Methods A total of 120 serum samples were collected from African Americans: 68 women and 52 men. This group consists of 45 normal HbA1c and 71 high HbA1c participants. Clinical metabolic parameters were measured. Cytokines were measured using Luminex X-MAP® technology. A series of unpaired t-test were computed to determine if there were significant differences between participants with and without elevated HbA1c. Pairwise Pearson Correlation (r) test was computed for each variable. Results In women, IL-3 expression was upregulated 1.7-fold in the presence of high circulating glucose. In men, IL-3 expression was downregulated 1.5-fold. Individuals with high HbA1c exhibit a negative correlation between IL-3 and BMI in men and women. Male serum IL-7 levels decrease in presence of circulating high glucose while female serum IL-7 levels increase. Normal HbA1c men have a 2.7-fold higher serum IL-7 level than women with normal HbA1c. Women participants have a positive correlation with serum IL-7 and HbA1c, as well as BMI. These correlations are lost in men. In the presence of high HbA1c, there is an increase in serum levels of IL-17A, G-CSF, and GM-CSF in women with high HbA1c. Conclusion An increase in HbA1c increases the expression of inflammatory cytokines and the risk of metabolic disease. Our data suggests that, in a sex specific manner, several cytokines may regulate cholesterol and lipid management in T2D.

Depot medroxyprogesterone acetate administration increases cervical CCR5+CD4+ T cells and induces immunosuppressive milieu at the cervicovaginal mucosa

Depot medroxyprogesterone acetate (Depo-Provera) is the most commonly used injectable hormone contraceptive in Sub-Saharan Africa where HIV incidence is high. We determined the impact of Depo-Provera on cervical immune cells and mediators in healthy women. In this longitudinal study, vaginal, endocervical, and rectal swabs were collected at baseline (visit 1), 1 month (visit 2), and 3 months (visit 3) after Depo-Provera injection. Cervical cells were collected by cytobrush and immune markers on cervical CD4 T cells were analyzed by multicolor flow cytometry at three different visits. The levels of immune mediators in cytobrush supernatants as well as vaginal, cervical, and rectal secretions from swabs were analyzed by multiplex assays and ELISA. Compared with baseline levels, we found a significant increase in the frequency of cervical CCR5CD4 T cells and a significant decrease in the frequency of cervical central memory CD4 T cells. Depo-Provera treatment had little effect on expression of immune mediators in rectal mucosa but significantly suppressed numerous immune mediators at cervicovaginal mucosa. Levels of MCP-1, G-CSF, IL-6, IL-10, GM-CSF, and IP-10 were significantly decreased in both vaginal and cervical secretions after Depo-Provera injection. In cervical samples collected by cytobrush, we found reduced levels of 22 of 25 immune mediators after Depo-Provera injection. Changes in immune mediators differed between vaginal and cervical mucosa, demonstrating compartment-specific responses. Depo-Provera altered immune profiles of cervical CD4 T cells and suppressed host immune response at cervicovaginal mucosa, suggesting its likely effect on transmission of sexually transmitted infections including HIV.

A16 ROLE OF MYELOID CELLS IN THE INITIATION OF COLITIS-ASSOCIATED COLON CANCER

Abstract Background Colorectal cancer (CRC) is the second leading cause of cancer death, with a major risk factor being chronic inflammation. Despite the clear association between inflammation and cancer, the mechanism by which colitis leads to CRC is not well understood. We recently showed that the presence of inflammation does not always correlate with colonic tumorigenesis, as the type of colitis (i.e. colitis-inducing agent) appears to be important for tumor initiation. Aims In this study, we aim to explore the mechanism by which inflammation contributes to the initiation of colitis-associated cancer. We hypothesized that dextran sodium sulfate (DSS)-induced colitis leads to the infiltration of a specific immune cell type that is associated with colonic tumorigenesis. Methods To generate tamoxifen-inducible Cre transgenic mice that allow for Dclk1+ cell lineage tracing and cell-specific knock-out of the tumor suppressor adenomatous polyposis coli (APC), we first crossed our transgenic Dclk1CreERT2 mice to both ROSA26tdTomato and APCfl/fl mice (Dclk1/APCfl/fl). Following Tamoxifen induction, mice were treated with the colitis-inducing agents DSS, trinitrobenzene sulfonic acid (TNBS), oxazolone, or Citrobacter rodentium. The tumor studies were repeated using azoxymethane (AOM)-DSS induced colitis-associated cancer model. Results Treatment with any of the four colitis-inducing agents (DSS, TNBS, oxazolone, or C. rodentium) induced colonic inflammation as detected by increased myeloperoxidase (MPO) activity and histologic analysis. Interestingly, DSS administration led to colonic tumors, whereas TNBS, oxazolone, or C. rodentium did not, even up to 52 weeks following colitis induction. FACS analysis of immune cells in the colon revealed no difference in the number of T or B cells in mice treated with any of the colitis-inducing agents. We did, however, detect significantly increased levels of Ly6G+ neutrophils and F4/80+ macrophages in DSS-treated mice compared to mice in any of the other three models of colitis. Consistent with this myeloid cell infiltration, significantly upregulated protein levels of G-CSF, IL-6, TNF-α, and CXCL1 were detected in DSS-treated mice compared to the other three models of colitis. IL-1α, IL-1β, IL-4, IL-10, and TGF-β levels were unchanged. Conclusions Our data suggest that infiltration of Ly6G+ neutrophils and pro-inflammatory F4/80+ macrophages, unique to DSS-induced colitis, contributes to colonic tumor formation. These data demonstrate that specific immune cell types, rather than the presence of colonic inflammation, play a critical role in the initiation of colitis-associated CRC. Funding Agencies CAG, CIHR

The effect of preconditioning with high-intensity training on tissue levels of G-CSF, its receptor and C-kit after an acute myocardial infarction in male rats

BackgroundExercise training is known as a practical way to increase cardioprotection against stress, and it seems that stem cell recruitment is one of its mechanisms. The purpose of the present study was to investigate the effect of preconditioning with High-intensity interval training (HIIT) on tissue levels of G-CSF, its receptor and C-Kit following acute myocardial infarction in male rats.MethodsTwenty Male Wistar rats were randomly divided into 4 groups of control, MI, HIIT, and HIIT+MI. Training groups performed 2 weeks of high intensity interval training in 4 sections. The first section consisted training in 3 days and 2 sessions in each day (4 × 2 min with 35–40 m/min and 3 × 2 min with 25–30 m/min between high intervals. The second part included 2 days of training (4 × 2 min with 40 to 45 m/min and 3 × 2 min with 28 to 32 m /min). The third part was performed in 3 days with one more repetition. The fourth section consisted 2 days of training and with one more repetition compared to section 3. For induction of myocardial infarction, subcutaneous injection of isoprenaline was used. CK, total CK, LDH, and troponin T were measured in serum and G-CSF, G-CSFR and C-Kit proteins were measured by the Western Blot method in the heart tissue.ResultsThe results of this study showed that enzymes of CK, total CK, LDH, troponin T had a significant increase in both MI and HIIT+MI groups compared to the other two groups (P < 0.001) and these indices in the MI group were significantly higher than the HIIT+MI group. Also, the results demonstrated that G-CSF, G-CSFR and C-Kit protein expression in the heart tissue significantly increased after MI. As well as, 2 weeks of HIIT training significantly increased G-CSF and C-kit in the training group compared to the control group, but the training caused that these proteins does not increase in HIIT+MI group as much as MI group.ConclusionsAlong with other protective pathways, high intensity interval training can increase cardioprotection and decrease heart injuries through the increase in G-CSF, G-CSFR and C-kit level.

Mutation in Fbxo11 Leads to Altered Immune Cell Content in Jeff Mouse Model of Otitis Media.

The Jeff mouse mutant carries a mutation in the F-box only 11 gene (Fbxo11) and heterozygous animals display conductive deafness due to the development of otitis media (OM). The Fbxo11 locus is also associated with chronic otitis media with effusion (COME) and recurrent OM in humans. The Jeff mutation affects the ability of FBXO11 to stabilize p53 that leads to perturbation in the TGF-beta/Smad2 signaling pathway important in immunity and inflammation. In the current study, we evaluated the effect of the Jeff mutation on the immune cell content using multicolor flow cytometry. In blood of Jeff heterozygotes, we observed a significant increase in the number of NK, dendritic (CD11b+), neutrophils, and natural killer T (NKT) cells and a significant decrease in effector T-helper and B-lymphocytes compared to wild-type controls. The percentage of NK cells significantly decreased in the lungs of Jeff heterozygotes, with a concomitant reduction in B-lymphocytes and T-cytotoxic cells. In the spleen, Jeff heterozygotes displayed a significant decrease in mature B-lymphocytes, effector T-helper, and naïve T-cytotoxic cells. Neutrophils, dendritic, and NKT cells dominated bulla fluid in Jeff heterozygote mice. Similar analysis carried out on Fbxo11tm2b/+ heterozygotes, which carry a null allele, showed no difference when compared to wild-type. Cytokine/chemokine analysis revealed a significant increase in the G-CSF, GM-CSF, sTNFRI, TPO, and IL-7 levels in Jeff heterozygote serum compared to wild-type. This analysis increases our understanding of the role played by Fbxo11, a gene associated with human OM, in the systemic and localized cellular immune response associated with increased susceptibility to OM.