High glucose induces IL-1beta expression in human monocytes: mechanistic insights

Previously, IL-1beta secretion from Type 2 diabetic patients has been shown to be increased compared with controls. In this study, we aimed to delineate the mechanism of IL-1beta induction under high-glucose (HG) conditions in human monocytes. THP-1 cells cultured in normal glucose were treated with increasing concentrations of d-glucose (10-25 mM) for 6-72 h. IL-1beta and IL-1 receptor antagonist levels were measured by ELISA and Western blots, whereas mRNA was quantitated by RT-PCR. Specific inhibitors and small interfering RNAs of PKC, p38, ERK1/2, NF-kappaB, and NADPH oxidase were used to determine the mediators in parallel experiments under HG conditions. IL-1beta-secreted protein, cellular protein, and mRNA increase under HG conditions is time and dose dependent, with maximum increase at 15 mM (48 h; P < 0.05). IL-1 receptor antagonist release was time and dose dependent, similar to IL-1beta expression pattern; however, the molar ratio of IL-1beta to IL-1RA was increased. Data from inhibitor and small interfering RNA experiments indicate that IL-1beta release under HG is mediated by PKC-alpha, via phosphorylation of p38 MAPK, and ERK1/2 leading to NF-kappaB activation, resulting in increased mRNA and protein for IL-1beta. At the same time, it appears that NADPH oxidase via p47phox activates NF-kappaB, resulting in increased IL-1beta secretion. Data suggest that, under HG conditions, monocytes release significantly higher amounts of IL-1beta through multiple mechanisms, further compounding the disease progression. Targeting signaling pathways mediating IL-1beta release could result in the amelioration of inflammation and possibly diabetic vasculopathies.     

Evaluation of the kinetics and mechanism of action of anti‐integration host factor‐mediated disruption of bacterial biofilms

The extracellular polymeric substance produced by many human pathogens during biofilm formation often contains extracellular DNA (eDNA). Strands of bacterial eDNA within the biofilm matrix can occur in a lattice‐like network wherein a member of the DNABII family of DNA‐binding proteins is positioned at the vertex of each crossed strand. To date, treatment of all biofilms tested with antibodies directed against one DNABII protein, Integration Host Factor (IHF), results in significant disruption. Here, using non‐typeable Haemophilus influenzae as a model organism, we report that this effect was rapid, IHF‐specific and mediated by binding of transiently dissociated IHF by anti‐IHF even when physically separated from the biofilm by a nucleopore membrane. Further, biofilm disruption fostered killing of resident bacteria by previously ineffective antibiotics. We propose the mechanism of action to be the sequestration of IHF upon dissociation from the biofilm eDNA, forcing an equilibrium shift and ultimately, collapse of the biofilm. Further, antibodies against a peptide positioned at the DNA‐binding tips of IHF were as effective as antibodies directed against the native protein. As incorporating eDNA and associated DNABII proteins is a common strategy for biofilms formed by multiple human pathogens, this novel therapeutic approach is likely to have broad utility.     

Data on known anti-virals in combating CoVid-19

Design and development of effective anti-virals in combating CoVid-19 is a great challenge worldwide. Known drugs such as chloroquine, lopinavir, favipiravir and remdesivir are used in the management of CoVid - 19. It is known that Ivermectin and remdesivir both are effective against filoviruses, paramyxo viruses. Available data also shows that ivermectin and remedesivir repress the replication of SARS-CoV-2. Thus, we document the potential use of ivermectin and remdesivir in the management of CoVid -19.     

Effect of berberine on the antioxidant status, ultrastructural modifications and protein bound carbohydrates in azoxymethane-induced colon cancer in rats

Chemically induced carcinogenesis models in the rat are widely used for studying the biology of cancer and for developing and evaluating cancer prevention strategies. The azoxymethane(AOM)-induced rat colon tumor is a valuable tool for studying the interaction between tumor development and exogenous factors. Malignant conditions are characterized by enhanced levels of lipid peroxidative products, protein bound carbohydrates indicative of membrane damage and an ineffective antioxidant scavenging system. In the present study, AOM-induced rat showed lipid peroxidative damage, alterations in the membrane glycoprotein component and antioxidant defense system, along with ultrastructural changes like disruption in goblet cell and its membrane, swollen mitochondria with cristae dispersed, elongated endoplasmic reticulum and other features of neoplastic invasion. Berberine significantly attenuated the increases in lipid peroxidation, protein bound carbohydrates and enhanced the antioxidative status. The present study suggests that berberine prevents the appearance of malignant morphology and ultrastructural changes of AOM induced cancer by producing apoptosis like changes. Thus berberine inhibits neoplastic transformation by the induction of antioxidant defence system and ability to induce apoptotic like changes—thus elucidating its anti cancer role.     

Purification and characterization of fibrinolytic protease from Bacillus amyloliquefaciens MCC2606 and analysis of fibrin degradation product by MS/MS

A serine protease with preference for fibrin protein was purified and characterized from Bacillus amyloliquefaciens MCC2606, isolated from dosa batter. The protease was purified using ammonium sulfate precipitation, ion-exchange, and gel filtration chromatography. The degradation activity of the protease toward the fibrin was significantly higher compared with other protein substrates in the study. The molecular weight of the CFR15-protease was estimated to be 32?kDa based on SDS-PAGE. The purified enzyme exhibited both fibrinolytic and fibrinogenolytic activity. The optimum pH and temperature for the activity of the enzyme was found to be 10.5 and 45°C. A significant inhibition was seen with the protease inhibitors phenyl methyl sulphonyl fluoride and ethylene diamine tetra acetic acid and the activity of the enzyme was enhanced in presence of Mn²⁺. There was an observed increase in vitro activated partial thromboplastin time and prothrombin time of both time and dose dependent study. Among the four chains of fibrin, the β-chain of fibrin appears to be the primary component and site susceptible for CFR15-protease in early action as indicated by MS/MS analysis of initial degradation products. These results indicated that the CFR15-protease have the potential to be an effective fibrinolytic agent.     

Antioxidant supplementation prevents exercise-induced lipid peroxidation, but not inflammation, in ultramarathon runners

To determine if 6 weeks of supplementation with vitamins E and C could alleviate exercise-induced lipid peroxidation and inflammation, we studied 22 runners during a 50 km ultramarathon. Subjects were randomly assigned to one of two groups: (1) placebos (PL) or (2) antioxidants (AO: 1000 mg vitamin C and 300 mg RRR-alpha-tocopheryl acetate). Blood samples were obtained prior to supplementation (baseline), after 3 weeks of supplementation, 1 h pre-, mid-, and postrace, 2 h postrace and for 6 days postrace. Plasma levels of alpha-tocopherol (alpha-TOH), ascorbic acid (AA), uric acid (UA), F2-isoprostanes (F2-IsoPs), tumor necrosis factor alpha (TNF-alpha), interleukin-6 (IL-6), and C-reactive protein (CRP) were measured. With supplementation, plasma alpha-TOH and AA increased in the AO but not the PL group. Although F2-IsoP levels were similar between groups at baseline, 28 +/- 2 (PL) and 27 +/- 3 pg/ml (AO), F2-IsoPs increased during the run only in the PL group (41 +/- 3 pg/ml). In PL women, F2-IsoPs were elevated postrace (p <.01), but returned to prerace concentrations by 2 h postrace. In PL men, F2-IsoP concentrations were higher postrace, 2 h postrace, and 1, 2, 3, 4, and 6 days postrace (PL vs. AO group, each p <.03). Markers of inflammation were increased dramatically in response to the run regardless of treatment group. Thus, AO supplementation prevented endurance exercise-induced lipid peroxidation but had no effect on inflammatory markers.