Rapid Inactivation of Infectious Pathogens by Chlorhexidine-Coated Gloves

1992 ◽  
Vol 13 (8) ◽  
pp. 463-471 ◽  
Author(s):  
Shanta Modak ◽  
Lester Sampath ◽  
Harvey S.S. Miller ◽  
Irving Millman
Keyword(s):  
Control Group ◽  
Vitro Assay ◽  
Live Virus ◽  
Dermal Irritation ◽  
B Virus ◽  
Immunodeficiency Virus ◽  
Rapid Destruction ◽  
Risk Of Exposure

AbstractObjective:Gloves containing chlorhexidine gluconate in an instant-release matrix on their inner surface (CHG gloves) were tested to determine their ability to rapidly inactivate infectious pathogens that may permeate or leak through the latex surface.Design:CHG gloves were exposed for 1 to 10 minutes to blood or media containing infectious pathogens (e.g., bacteria, fungi, parasites, and viruses) as well as to lymphocytes and macrophages that are known to be the primary carriers of human immunodeficiency virus (HIV). Inactivation of pathogens was determined either by in vitro assay or in vivo infectivity. Stressed control and CHG glove fingers were submerged in a viral pool (retrovirus or bacteriophage) and after a set time, the glove interiors were checked for presence of permeated viz-ions.Results:CHG gloves rapidly inactivate all the pathogens tested including retrovirus and hepatitis B virus (90% to 100%). In the stressed glove fingers, live virus was detected in 26% of the control group but not in any of the CHG group.Conclusions:The use of CHG gloves may reduce the risk of exposure to infectious fluidborne pathogens should the integrity of the latex barrier be compromised by overt failure or by permeation of viruses. Rapid destruction of lymphocytes and macrophages may facilitate inactivation of HIV associated with these cells. Tests have shown that CHG coating does not alter physical properties of the glove, and, furthermore, CHG gloves do not show potential for dermal irritation or sensitization.

scholarly journals 3-Pentylcatechol, a Non-Allergenic Urushiol Derivative, Displays Anti-Helicobacter pylori Activity In Vivo

2020 ◽  
Vol 13 (11) ◽  
pp. 384
Author(s):  
Hang Yeon Jeong ◽  
Tae Ho Lee ◽  
Ju Gyeong Kim ◽  
Sueun Lee ◽  
Changjong Moon ◽  
...  
Keyword(s):  
Helicobacter Pylori ◽  
Triple Therapy ◽  
Inflammatory Cells ◽  
Control Group ◽  
Vitro Assay ◽  
Low Concentrations ◽  
H Pylori ◽  
Stomach Mucous Membrane

We previously reported that 3-pentylcatechol (PC), a synthetic non-allergenic urushiol derivative, inhibited the growth of Helicobacter pylori in an in vitro assay using nutrient agar and broth. In this study, we aimed to investigate the in vivo antimicrobial activity of PC against H. pylori growing in the stomach mucous membrane. Four-week-old male C57BL/6 mice (n = 4) were orally inoculated with H. pylori Sydney Strain-1 (SS-1) for 8 weeks. Thereafter, the mice received PC (1, 5, and 15 mg/kg) and triple therapy (omeprazole, 0.7 mg/kg; metronidazole, 16.7 mg/kg; clarithromycin, 16.7 mg/kg, reference groups) once daily for 10 days. Infiltration of inflammatory cells in gastric tissue was greater in the H. pylori-infected group compared with the control group and lower in both the triple therapy- and PC-treated groups. In addition, upregulation of cytokine mRNA was reversed after infection, upon administration of triple therapy and PC. Interestingly, PC was more effective than triple therapy at all doses, even at 1/15th the dose of triple therapy. In addition, PC demonstrated synergism with triple therapy, even at low concentrations. The results suggest that PC may be more effective against H. pylori than established antibiotics.

scholarly journals Influenza B Virus NS1-Truncated Mutants: Live-Attenuated Vaccine Approach

2008 ◽  
Vol 82 (21) ◽  
pp. 10580-10590 ◽  
Author(s):  
Rong Hai ◽  
Luis Martínez-Sobrido ◽  
Kathryn A. Fraser ◽  
Juan Ayllon ◽  
Adolfo García-Sastre ◽  
...  
Keyword(s):  
Reverse Genetics ◽  
Influenza Viruses ◽  
Influenza B Virus ◽  
Influenza B ◽  
Type I ◽  
Live Attenuated Vaccine ◽  
Live Virus ◽  
B Virus

ABSTRACT Type B influenza viruses can cause substantial morbidity and mortality in the population, and vaccination remains by far the best means of protection against infections with these viruses. Here, we report the construction of mutant influenza B viruses for potential use as improved live-virus vaccine candidates. Employing reverse genetics, we altered the NS1 gene, which encodes a type I interferon (IFN) antagonist. The resulting NS1 mutant viruses induced IFN and, as a consequence, were found to be attenuated in vitro and in vivo. The absence of pathogenicity of the NS1 mutants in both BALB/c and C57BL/6 PKR−/− mice was confirmed. We also provide evidence that influenza B virus NS1 mutants induce a self-adjuvanted immune response and confer effective protection against challenge with both homologous and heterologous B virus strains in mice.

Melatonin does not affect the black pigment migration in the crab Neohelice granulata

Biologia ◽  
2009 ◽  
Vol 64 (1) ◽  
Author(s):  
Fábio Maciel ◽  
Márcio Geihs ◽  
Marcelo Vargas ◽  
Bianca Ramos ◽  
Bruno Cruz ◽  
...  
Keyword(s):  
Physiological Function ◽  
Physiological Solution ◽  
Control Group ◽  
Constant Darkness ◽  
Pigment Dispersion ◽  
Vitro Assay ◽  
Neohelice Granulata ◽  
Pigment Migration

AbstractN-acetyl-5-methoxytryptamine or melatonin is a multifunctional molecule. The main physiological function, at least in vertebrates, is to transduce to the animal the photoperiodic information and regulate rhythmic parameters. But studies have also observed the action of this molecule on pigment migration in ectothermic vertebrates. Thus the aim of this paper was to investigate in vivo and in vitro the influence of melatonin on the pigment migration in melanophores of the crab Neohelice granulate. Injections of melatonin (2 × 10−9 moles · crab−1) at 07:00 h or 19:00 h did not affect (p > 0.05) the circadian pigment migration of the melanophores in constant darkness. Additionally no significant pigment migration (p > 0.05) was verified in normal and eyestalkless crabs injected with melatonin (10−10–10−7 moles · crab−1) during the day or night. In the in vitro assay, the response of melanophores to the pigment-dispersing hormone in eyestalkless crabs injected with melatonin (2 × 10−9 moles · crab−1) 1 and 12 hours before the observations did not differ (p > 0.05) from the control group (injected with physiological solution). These results suggest that melatonin does not act as a signaling factor for pigment dispersion or aggregation in the melanophores of N. Granulate.

GH002: A Novel and Potent Agents for Elevating HDL-Cholesterol

2011 ◽  
Vol 340 ◽  
pp. 337-343
Author(s):  
Guo Lei
Keyword(s):  
Hepg2 Cells ◽  
Density Lipoprotein ◽  
Hdl Cholesterol ◽  
Control Group ◽  
Vitro Assay ◽  
Cholesterol Levels ◽  
Promoter Effects ◽  
Positive Effect

The aim of this study was to evaluate whether the positive effect of GH002 on high-density lipoprotein (HDL) cholesterol in vitro and in vivo. In vitro assay, effects of GH002 on apolipoprotein (apo) A-I was studied using stable-transfected HepG2 cells with recombinant vector including apoA-I promoter; Effects of GH002 on apoA-I, apoA-II and apoC-III production were determined using HepG2 cells. In vivo assay, Effects of GH002 on lipid profile were investigated in hyperlipidemic rats. The results showed that GH002 can effectively activate apoA-I promoter, enhance apoA-I and apoA-II secretion in vitro, whereas reduce apoC-III production significantly. Furthermore, after in vivo study that the hyperlipidemic rats were treated with GH002, HDL-cholesterol levels were increased significantly (P<0.01) at 2 weeks (100 mg/kg, 28.8%) and 3 weeks (30mg/kg, 19.8% and 100mg/kg, 36.4%, respectively) compared with control group. Triglyceride levels were reduced significantly at 2 and 3 weeks (19.5%, P<0.05 and 28.1%, P<0.01 respectively). Total cholesterol levels also were reduced at 3 weeks (19.1%, P<0.05) after 100mg/kg GH002 administration, but GH002 didn’t increase the ratio of liver/body weight compared with the control group at the end of the experiments. It is therefore reasonable to assume that GH002 is an effectively HDL-cholesterol enhancer by regulating apoA-I gene expression, consequently enhancing apoA-I, apoA-II secretion and reducing apoC-III production.

scholarly journals Phytophthora Antagonism of Endophytic Bacteria Isolated from Roots of Black Pepper (Piper nigrum L.)

Agronomy ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 286 ◽  
Author(s):  
Van Anh Ngo ◽  
San-Lang Wang ◽  
Van Bon Nguyen ◽  
Chien Thang Doan ◽  
Thi Ngoc Tran ◽  
...  
Keyword(s):  
Antifungal Activity ◽  
Endophytic Bacteria ◽  
Black Pepper ◽  
Antagonistic Activity ◽  
Piper Nigrum ◽  
Control Group ◽  
Vitro Assay ◽  
16S Rna

In this study, 90 root samples were collected from 30 black pepper farms in three provinces in the Central Highlands of Vietnam. A total of 352 endophytic bacteria were isolated and their morphology described. An in vitro assay on the antifungal activity of these isolates was then conducted and 47 isolates were found to have antagonistic activity on Phytophthora fungi. The antifungal activity of the 47 isolates was evaluated in vivo by shoot assay. Among these 47 isolates, 6 were selected for further investigation. The six isolates were classified and identified by sequencing the 16S RNA gene and phylogeny. The results showed that all six endophytic bacteria belong to the following species of Bacillus genus: B. siamensis, B. amyloliquefaciens, B. velezenis, and B. methylotrophiycus. Enzymatic activity related to the antifungal activity of the six potent isolates was determined; it showed that they possessed high chitinase and protease activities. These isolates were applied for black pepper seedlings in greenhouse. The results showed three promising isolates: B. siamensis EB.CP6, B. velezensis EB.KN12, and B. methylotrophycus EB.KN13. Black pepper seedlings treated with the promising bacteria had the lowest rate of root disease (8.45–11.21%) and lower fatal rate (11.11–15.55%) compared to the control group (24.81% and 24.44%). In addition, the three promising isolates strongly affected the growth of the black pepper seedlings in greenhouse. The plant height, length of roots, and fresh biomass of the seedlings in the treated plots were higher than those in the control plots. Thus, the endophytic bacterial isolates have the potential to act as biocontrol agent for the sustainable production of black pepper.

scholarly journals Effect of Chestnut Tannins and Short Chain Fatty Acids as Anti-Microbials and as Feeding Supplements in Broilers Rearing and Meat Quality

Animals ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 659 ◽  
Author(s):  
Federica Mannelli ◽  
Sara Minieri ◽  
Giovanni Tosi ◽  
Giulia Secci ◽  
Matteo Daghio ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Meat Quality ◽  
Short Chain Fatty Acids ◽  
Control Group ◽  
Poultry Production ◽  
Vitro Assay ◽  
Promising Alternative ◽  
Chain Fatty Acids

Chestnut tannins (CT) and saturated short medium chain fatty acids (SMCFA) are valid alternatives to contrast the growth of pathogens in poultry rearing, representing a valid alternative to antibiotics. However, the effect of their blends has never been tested. Two blends of CT extract and Sn1-monoglycerides of SMCFA (SN1) were tested in vitro against the proliferation of Clostridium perfringens, Salmonella typhymurium, Escherichia coli, Campylobacter jejuni. The tested concentrations were: 3.0 g/kg of CT; 3.0 g/kg of SN1; 2.0 g/kg of CT and 1.0 g/kg of SN1; 1.0 g/kg of CT and 2.0 g/kg of SN1. Furthermore, their effect on broiler performances and meat quality was evaluated in vivo: one-hundred Ross 308 male birds were fed a basal diet with no supplement (control group) or supplemented with CT or SN1 or their blends at the same concentration used in the in vitro trial. The in vitro assay confirmed the effectiveness of the CT and SN1 mixtures in reducing the growth of the tested bacteria while the in vivo trial showed that broiler performances, animal welfare and meat quality were not negatively affected by the blends, which could be a promising alternative in replacing antibiotics in poultry production.

scholarly journals TLR4 Influences Hepatitis B Virus Related Hepatocellular Carcinoma by Regulating the Wnt/β-Catenin Pathway

2017 ◽  
Vol 42 (2) ◽  
pp. 469-479 ◽  
Author(s):  
Yuanqin Yin ◽  
Fei Li ◽  
Songlin Li ◽  
Jingjing Cai ◽  
Jing Shi ◽  
...  
Keyword(s):  
Hepatocellular Carcinoma ◽  
Hepatitis B Virus ◽  
Hepatitis B ◽  
Cell Apoptosis ◽  
Migration And Invasion ◽  
Control Group ◽  
B Virus ◽  
Sirna Group

Background/Aims: We investigated the correlation between toll-like receptor 4 (TLR4) and β-catenin for disclosing the potential pathogenesis of hepatocellular carcinoma (HCC). Methods: Immunohistochemical toolkit was implemented to measure the expression of TLR4 and β-catenin in 98 cases of HCC tissues and adjacent tissues. After setting up the HepG2.2.15 hepatitis B virus (HBV) related HCC cell line, we divided the cells into the control group, TLR4 siRNA group, β-catenin siRNA group, and pcDNA.3.1 TLR4 + β-catenin siRNA group. Western blot, CCK-8 method, Transwell and flow cytometry were used to detect protein expression, cell proliferation, cell migration and invasion as well as cell apoptosis, respectively. Nude mice tumor model was established to observe the effects of TLR4 and β-catenin on the progression of HBV-related HCC in vivo. Results:The positive rates of TLR4 and β-catenin were higher in HCC tissues compared with normal tissues. Both the TLR4 siRNA group and β-catenin siRNA group exhibited a decreased expression of β-catenin. The proliferation, migration and invasion of tumor cells in the above two groups were suppressed, while the cell apoptosis appeared to be stimulated. As suggested by the results from in vivo and in vitro experiments, the up-regulation of TLR4 could antagonize the corresponding effect of β-catenin siRNA. Conclusions: TLR4 can affect the expression of β-catenin and hence influence the progression of HBV-related HCC.

scholarly journals Moringa oleifera Leaves’ Extract Enhances Nonspecific Immune Responses, Resistance against Vibrio alginolyticus, and Growth in Whiteleg Shrimp (Penaeus vannamei)

Animals ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 42
Author(s):  
Zaenal Abidin ◽  
Huai-Ting Huang ◽  
Zhen-Hao Liao ◽  
Bo-Ying Chen ◽  
Yu-Sheng Wu ◽  
...  
Keyword(s):  
Immune Responses ◽  
Growth Performance ◽  
Control Group ◽  
Superoxide Anion Production ◽  
Vitro Assay ◽  
Immune Related Gene ◽  
Anion Production ◽  
Whiteleg Shrimp

Moringa is widely known as a plant with high medicinal properties. Therefore, moringa has a high potential for use as an immunostimulant in shrimp. This study investigated the effect of a moringa water extract on the immune response, resistance against V. alginolyticus, and growth performance of whiteleg shrimp. To perform the in vitro assay, hemocytes were incubated with different concentrations of the moringa extract. Furthermore, the moringa extract was incorporated at 0 (control), 1.25 g (ME1.25), 2.5 g (ME2.5), and 5.0 g (ME5.0) per kg of diet for the in vivo assay. During the rearing period, immune responses, namely the total hemocyte count (THC), phenoloxidase (PO) activity, phagocytosis activity, superoxide anion production, and immune-related gene expression were examined on days 0, 1, 2, 4, 7, 14, 21, and 28. Growth performance was measured 60 days after the feeding period. Furthermore, the shrimp were challenged with V. alginolyticus after being fed for different feeding durations. The results of the in vitro assay revealed that 100–250 ppm of the moringa extract enhanced the PO activity, phagocytic rate (PR), and superoxide anion production. The findings of the in vivo assay demonstrated that the THC, PO activity, PR, and immune-related gene expression, including alpha-2-macroglobulin, prophenoloxidase II, penaeidin2, penaeidin3, anti-lipopolysaccharide factor, crustin, lysozyme, superoxide dismutase, and clotting protein, were higher in the group of ME.25 and ME5.0 than in the control and ME1.25 at several time points. Growth performance was significantly increased (p < 0.05) in the ME2.5 group compared to the control group. Furthermore, the dietary ME2.5 resulted in a higher survival rate compared to that of the control group after challenging with V. alginolyticus, especially at ME2.5 administered for 4 and 7 days. This study indicated that the incorporation of the moringa extract at 2.5 g per kg of diet enhanced the immune response, the growth performance of the whiteleg shrimp, and the resistance against V. alginolyticus infection.

scholarly journals In vitro functional analysis of gRNA sites regulating assembly of hepatitis B virus

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Nikesh Patel ◽  
Sam Clark ◽  
Eva U. Weiß ◽  
Carlos P. Mata ◽  
Jen Bohon ◽  
...  
Keyword(s):  
Core Protein ◽  
Wild Type ◽  
Sequence Structure ◽  
Stem Loop ◽  
Vitro Assay ◽  
X Ray ◽  
Cryo Electron Microscopy ◽  
B Virus

AbstractThe roles of RNA sequence/structure motifs, Packaging Signals (PSs), for regulating assembly of an HBV genome transcript have been investigated in an efficient in vitro assay containing only core protein (Cp) and RNA. Variants of three conserved PSs, within the genome of a strain not used previously, preventing correct presentation of a Cp-recognition loop motif are differentially deleterious for assembly of nucleocapsid-like particles (NCPs). Cryo-electron microscopy reconstruction of the T = 4 NCPs formed with the wild-type gRNA transcript, reveal that the interior of the Cp shell is in contact with lower resolution density, potentially encompassing the arginine-rich protein domains and gRNA. Symmetry relaxation followed by asymmetric reconstruction reveal that such contacts are made at every symmetry axis. We infer from their regulation of assembly that some of these contacts would involve gRNA PSs, and confirmed this by X-ray RNA footprinting. Mutation of the ε stem-loop in the gRNA, where polymerase binds in vivo, produces a poor RNA assembly substrate with Cp alone, largely due to alterations in its conformation. The results show that RNA PSs regulate assembly of HBV genomic transcripts in vitro, and therefore may play similar roles in vivo, in concert with other molecular factors.

In-vitro- und In-vivo-Wirkung von Schilddrüsenhormon auf das Wachstum von Neuroblastomzellen

1990 ◽  
Vol 29 (03) ◽  
pp. 120-124
Author(s):  
R. P. Baum ◽  
E. Rohrbach ◽  
G. Hör ◽  
B. Kornhuber ◽  
E. Busse
Keyword(s):  
Cell Differentiation ◽  
Neuroblastoma Cells ◽  
Control Group ◽  
Initial Value ◽  
Initial Rise ◽  
Biphasic Effect ◽  
Contrast Microscopy ◽  
Morphological Sign

The effect of triiodothyronine (T3) on the differentiation of cultured neuroblastoma (NB) cells was studied after 9 days of treatment with a dose of 10-4 M/106 cells per day. Using phase contrast microscopy, 30-50% of NB cells showed formation of neurites as a morphological sign of cellular differentiation. The initial rise of the mitosis rate was followed by a plateau. Changes in cyclic nucleotide content, in the triphosphates and in the activity of the enzyme ornithine decarboxylase (ODC) were assessed in 2 human and 2 murine cell lines to serve as biochemical parameters of the cell differentiation induced by T3. Whereas the cAMP level increased significantly (3 to 7 fold compared with its initial value), the cGMP value dropped to 30 to 50% of that of the control group. ATP and GTP increased about 200%, the ODC showed a decrease of about 50%. The present studies show a biphasic effect of T3 on neuroblastoma cells: the initial rise of mitotic activity is followed by increased cell differentiation starting from day 4 of the treatment.

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