scholarly journals Study on H3K9 acetylation modification and TLR9 immune regulation mechanism in patients with anti-HBV treatment using thymosin a1 combined with entecavir

2020 ◽  
Author(s):  
Hai-Peng Zhu ◽  
Ke Wang ◽  
Wei Du ◽  
Huan-Huan Cao ◽  
Qing-Yang Zhong ◽  
...  
Keyword(s):  
Hepatitis B ◽  
Combination Therapy ◽  
Histone Acetylation ◽  
Antiviral Treatment ◽  
Inflammatory Factors ◽  
Regulation Mechanism ◽  
Tlr9 Expression ◽  
Luminex Technology ◽  
H3k9 Acetylation ◽  
The Relationship

AbstractFor hepatitis B antiviral treatment, there has been no comprehensive method yet. Interferon has poor antiviral efficacy, while nucleoside drugs have long course of treatment and high relapse rate. To improve the anti-HBV curative effect, treatment methods such as thymosin combined with entecavir have become a focus of clinical investigation. To explore potential mechanism of the combination therapy, based on previous studies, this paper explores the relationship between TLR9 expression in PBMCs, secretion of corresponding downstream inflammatory factors and HBV load in anti-HBV treatment with Thymosin a1 (Ta1) combined with entecavir. Chromatin immunoprecipitation combined with PCR method was adopted to detect H3K9 acetylation modification in patients. The relationship between TLR9 expression was explored using RT-QPCR, the relationship between secretion of inflammatory factors, efficacy and TLR9 mRNA expression was determined using Luminex technology. The results showed that during anti-HBV treatment with Ta1 combined with entecavir, histone acetylation increased in patients’ PBMCs, acetylated protein H3K9Ac had significant binding with promoter region of the TRL9 gene, thereby increasing the expression of TRL9 mRNA, activating the immune pathway under TRL9 regulation, promoting secretion of inflammation factors IL-6, IL-12, IFN-γ, and TNF-α, boosting the progress of antiviral therapy. H3K9 acetylation modification of TLR9 exists and plays an important role in patients with chronic hepatitis B. During the combination therapy with entecavir and Ta1, histone acetylation modification of TLR9 was significantly improved, which increased the expression of TLR9 at the mRNA and protein levels, and further regulated IL-6, IL-12 and other cytokines.

European Recommendations for the Management of Healthcare Workers Occupationally Exposed to Hepatitis

2018 ◽  
Vol 2 (1) ◽  
pp. 49
Author(s):  
Enis Uruci
Keyword(s):  
Occupational Exposure ◽  
Hepatitis B ◽  
Healthcare Workers ◽  
Antiviral Treatment ◽  
World Health ◽  
Antibody Concentration ◽  
Post Exposure Prophylaxis ◽  
Transferase Activity ◽  
Mediterranean Countries

Exposure prevention is the primary strategy to reduce the risk of occupational bloodborne pathogen infections in healthcare workers (HCW). HCWs should be made aware of the medicolegal and clinical relevance of reporting an exposure, and have ready access to expert consultants to receive appropriate counselling, treatment and follow-up. Vaccination against hepatitis B virus (HBV), and demonstration of immunisation before employment are strongly recommended. HCWs with postvaccinal anti-HBs levels, 1-2 months after vaccine completion, .or=10 mIU/mL are considered as responders. Responders are protected against HBV infection: booster doses of vaccine or periodic antibody concentration testing are not recommended. Alternative strategies to overcome non-response should be adopted. Isolated anti-HBc positive HCWs should be tested for anti-HBcIgM and HBV-DNA: if negative, anti-HBs response to vaccination can distinguish between infection (anti-HBs .or=50 mIU/ml 30 days after 1st vaccination: anamnestic response) and false positive results(anti-HBs .or=10 mUI/ml 30 days after 3rd vaccination: primary response); true positive subjects have resistance to re-infection. and do not need vaccination The management of an occupational exposure to HBV differs according to the susceptibility of the exposed HCW and the serostatus of the source. When indicated, post-exposure prophylaxis with HBV vaccine, hepatitis B immunoglobulin or both must be started as soon as possible (within 1-7 days). In the absence of prophylaxis against hepatitis C virus (HCV) infection, follow-up management of HCV exposures depends on whether antiviral treatment during the acute phase is chosen. Test the HCW for HCV-Ab at baseline and after 6 months; up to 12 for HIV-HCV co-infected sources. If treatment is recommended, perform ALT (amino alanine transferase) activity at baseline and monthly for 4 months after exposure, and qualitative HCV-RNA when an increase is detected. Introduction Bloodborne pathogens such as hepatitis B (HBV) and C virus (HCV) represent an important hazard for healthcare workers (HCWs) (1). In the general population, HCV prevalence varies geographically from about 0.5% in northern countries to 2% in Mediterranean countries, with some 5 million chronic carriers estimated in Europe; while HBV prevalence ranges from 0.3% to 3%. The World Health Organization (WHO) estimates that each year in Europe 304 000 HCWs are exposed to at least one percutaneous injury with a sharp object contaminated with HBV, 149 000 are exposed to HCV and 22 000 to HIV. The probability of acquiring a bloodborne infection following an occupational exposure has been estimated to be on average.

scholarly journals A noninvasive model to predict liver histology for antiviral therapy decision in chronic hepatitis B with alanine aminotransferase < 2 upper limit of normal

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Shanshan Chen ◽  
Haijun Huang ◽  
Wei Huang
Keyword(s):  
Chronic Hepatitis ◽  
Hepatitis B ◽  
Liver Biopsy ◽  
Antiviral Therapy ◽  
Alanine Aminotransferase ◽  
Antiviral Treatment ◽  
Training Group ◽  
Liver Histology ◽  
Validation Group ◽  
Upper Limit

Abstract Background At present, most assessments of liver fibrosis staging mainly focus on non-invasive diagnostic methods. This study aims to construct a noninvasive model to predict liver histology for antiviral therapy in chronic hepatitis B (CHB) with alanine aminotransferase (ALT) < 2 times upper limit of normal (ULN). Methods We retrospectively analyzed 577 patients with CHB who received liver biopsy and whose ALT was less than 2 ULN. Then they were randomly divided into a training group and a validation group. Through logistic regression analysis, a novel predictive model was constructed in the training group to predict significant changes in liver histology [necro-inflammatory activity grade (G) ≥ 2 or fibrosis stage (S) ≥ 2] and then validated in the validation group. Results If liver biopsy showed moderate or severe inflammation or significant fibrosis, antiviral treatment was recommended. Aspartate aminotransferase (AST), anti-hepatitis B virus core antibody (anti-HBC) and glutamine transpeptidase (GGT) were identified as independent predictors for antiviral therapy, with area under the ROC curve (AUROC) of 0.649, 0.647 and 0.616, respectively. Our novel model index, which combined AST, anti- HBC and GGT with AUROC of 0.700 and 0.742 in training set and validation set. Conclusions This study established a noninvasive model to predict liver histology for antiviral treatment decision in patients with CHB with ALT < 2 ULN, which can reduce the clinical needs of liver biopsy.

scholarly journals POS0176 COMBINING CXCL5 WITH CONVENTIONAL THERAPY PROVIDES DURABLE IMMUNOSUPPRESSION IN MURINE LUPUS NEPHRITIS

2021 ◽  
Vol 80 (Suppl 1) ◽  
pp. 301.1-301
Author(s):  
X. Fan ◽  
D. Guo ◽  
F. Lim ◽  
J. Thumboo ◽  
W. Hwang ◽  
...  
Keyword(s):  
Lupus Nephritis ◽  
Combination Therapy ◽  
Graft Versus Host Disease ◽  
Conventional Therapy ◽  
Immune Cell ◽  
Marrow Transplant ◽  
High Concentration ◽  
Host Disease ◽  
Graft Versus Host ◽  
Luminex Technology

Background:Lupus nephritis (LN) is a condition arising from abnormal immune responses to internal organs. Patients with LN suffer from severe morbidity and mortality1, 2. Despite the aggressive regimen, 20-40% of patients do not respond to current conventional therapy. CXCL5, as a potent chemoattractant and activator of neutrophils3, demonstrates strong immunosuppression in the pre-clinical mouse model of graft versus host disease (GvHD)4 and lupus nephritis (LN) by intravenous administration.Objectives:In this study, we aim to evaluate whether the therapeutic effect of conventional therapy could be further improved by combination therapy with CXCL5.Methods:Ten doses of exogenous CXCL5 (3ug/kg, biweekly) together with conventional therapy (methylprednisolone (MP, intravenous (IV) injection with 8.3mg/kg/day at day-1, day-2 and day-3) + cyclophosphamide (CP, IV injection with 0.5g/BSA at day-4, monthly for 5 doses)) were administered to 8-week-old Faslpr mice by IV injection. Mice were monitored for 64 weeks. Splenic immune profile at 3 weeks post treatment (PT) was measured by flow cytometry. Circulating cytokine profile were detected by Luminex technology. Renal function was evaluated by urinary spot albumin creatinine ratio. In situ renal immune cell infiltration and complement 3 deposition were detected by Haematoxylin and Eosin (H&E) and immunohistochemistry staining.Results:Comparing to control mice (dPBS: 0% at 28 weeks PT), mice survival was improved to 100% at 40 weeks PT and 55.6% at 64 weeks PT by combination therapy of CXCL5 and conventional therapy (MP + CP) (p<0.0001). The accumulation of autoantibody (anti-dsDNA) and proteinuria were reduced 61.2-fold at 32 weeks PT (p=0.004) and 83.5-fold at 28 weeks PT (p=0.03) respectively. Both autoantibody and proteinuria were maintained at low level for 64 weeks. The classification of LN was significantly reduced at 10 weeks PT and equivalent to the classes we observed in pre-onset mice (p=0.004). Although combination therapy was not able to promote Tregs, it reduced both innate (neutrophils and macrophages) and adaptive (TH1, TH2 and TH17 cells and B cells) immunities significantly. Concomitantly, the serum level of endogenous CXCL5 was boosted up by exogenous administration from 74.2 +/- 53.9 pg/ml to 254.1 +/- 147.1 pg/ml at 8 weeks PT (p=0.05) and this relative high concentration was maintained for 48 weeks.Conclusion:Combining CXCL5 with conventional therapy provides effective and durable immunosuppression in murine LN and it may provide a new option for LN therapy.References:[1]Almaani S, Meara A, Rovin BH. Update on Lupus Nephritis. Clin J Am Soc Nephrol. May 8 2017;12(5):825-835. doi:10.2215/cjn.05780616.[2]Touma Z, Gladman DD. Current and future therapies for SLE: obstacles and recommendations for the development of novel treatments. Lupus Sci Med. 2017;4(1):e000239. doi:10.1136/lupus-2017-000239.[3]Koltsova EK, Ley K. The mysterious ways of the chemokine CXCL5. Immunity. Jul 23 2010;33(1):7-9. doi:10.1016/j.immuni.2010.07.012.[4]Fan X, Guo D, Cheung AMS, et al. Mesenchymal Stromal Cell (MSC)-Derived Combination of CXCL5 and Anti-CCL24 Is Synergistic and Superior to MSC and Cyclosporine for the Treatment of Graft-versus-Host Disease. Biol Blood Marrow Transplant. Jun 5 2018;doi:10.1016/j.bbmt.2018.05.029.Disclosure of Interests:None declared

scholarly journals Lipopolysaccharides promote pulmonary fibrosis in silicosis through the aggravation of apoptosis and inflammation in alveolar macrophages

2020 ◽  
Vol 15 (1) ◽  
pp. 598-605
Author(s):  
Shiyi Tan ◽  
Shang Yang ◽  
Mingke Chen ◽  
Yurun Wang ◽  
Li Zhu ◽  
...  
Keyword(s):  
Pulmonary Fibrosis ◽  
Alveolar Macrophages ◽  
Inflammatory Factors ◽  
Necrosis Factor Alpha ◽  
Defensive Role ◽  
Factor Alpha ◽  
Apoptosis And Inflammation ◽  
The Relationship ◽  
Lps Treatment ◽  
Necrosis Factor

AbstractAlveolar macrophages (AMs) play an important defensive role by removing dust and bacteria from alveoli. Apoptosis of AMs is associated with lung fibrosis; however, the relationship between this apoptotic event and environmental factors, such as the presence of lipopolysaccharides (LPSs) in the workplace, has not yet been addressed. To investigate whether exposure to LPS can exacerbate fibrosis, we collected AMs from 12 male workers exposed to silica and incubated them in the presence and absence of LPS for 24 h. We show that the levels of cleaved caspase-3 and pro-inflammatory cytokines interleukin (IL)-1β, IL-6, and tumor necrosis factor-alpha were increased in these AMs following LPS treatment. Moreover, we demonstrate that LPS exposure aggravated apoptosis and the release of inflammatory factors in AMs in a mouse model of silicosis, which eventually promoted pulmonary fibrosis. These results suggest that exposure to LPS may accelerate the progression of pulmonary fibrosis in silicosis by increasing apoptosis and inflammation in AMs.

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