ARTIFICIAL REARING OF COLOSTRUM-DEPRIVED PIGLETS USING IRON CHELATORS: IN VITRO AND IN VIVO COMPARISONS OF EDDHA AND HBED WITH AND WITHOUT PORCINE IMMUNOGLOBULINS

1990 ◽  
Vol 70 (2) ◽  
pp. 647-654 ◽  
Author(s):  
M. D. DREW ◽  
I. M. BEVANDICK ◽  
B. D. OWEN
Keyword(s):  
Acetic Acid ◽  
Survival Rates ◽  
Antibacterial Properties ◽  
Ethylene Diamine ◽  
Iron Chelators ◽  
E Coli ◽  
Weight Gains ◽  
Milk Replacers

Two iron chelators, ethylene diamine-di-orthohydroxyphenyl acetic acid (EDDHA) and N,N′-Bis(o-hydroxybenzyl)-ethylenediamine diacetic acid (HBED), were investigated as possible substitutes for lactoferrin in sow milk replacers. The antibacterial properties of lactoferrin, EDDHA and HBED, with and without porcine immunoglobulins, were compared in vitro using E. coli 0 157 K88. Lactoferrin and EDDHA inhibited the growth of E. coli over a 12-h incubation period, while HBED had no effect on bacterial growth. Porcine immunoglobulins inhibited the growth of E. coli after 6, but not after 12 h of incubation. Ethylene diamine-di-orthohydroxyphenyl acetic acid and HBED were further compared as substitutes for lactoferrin in sow milk replacers fed to colostrum-deprived piglets. All piglets received porcine immunoglobulins for 24 h following birth. They then received EDDHA, HBED or no chelator with or without porcine immunoglobulins on days 2–14. Piglets that received HBED had lower survival rates and weight gains than piglets that received EDDHA or no chelator. Weight gains were equal for piglets receiving either EDDHA or immunoglobulins alone and there was no additive effect on piglet weight gains when EDDHA and immunoglobulins were fed together. Ethylene diamine-di-orthohydroxyphenyl acetic acid may be a practical substitute for lactoferrin in sow milk replacers. Key words: Immunoglobulins, piglet, lactoferrin, iron chelators, E. coli

scholarly journals Antimicrobial Effect and Cytotoxic Evaluation of Mg-Doped Hydroxyapatite Functionalized with Au-Nano Rods

Molecules ◽  
2021 ◽  
Vol 26 (4) ◽  
pp. 1099
Author(s):  
Domenico Franco ◽  
Giovanna Calabrese ◽  
Salvatore Petralia ◽  
Giulia Neri ◽  
Carmelo Corsaro ◽  
...  
Keyword(s):  
Bone Matrix ◽  
Antibacterial Properties ◽  
Antimicrobial Effect ◽  
Cell Number ◽  
Bacterial Reduction ◽  
E Coli ◽  
Good Biocompatibility ◽  
Inorganic Mineral

Hydroxyapatite (HA) is the main inorganic mineral that constitutes bone matrix and represents the most used biomaterial for bone regeneration. Over the years, it has been demonstrated that HA exhibits good biocompatibility, osteoconductivity, and osteoinductivity both in vitro and in vivo, and can be prepared by synthetic and natural sources via easy fabrication strategies. However, its low antibacterial property and its fragile nature restricts its usage for bone graft applications. In this study we functionalized a MgHA scaffold with gold nanorods (AuNRs) and evaluated its antibacterial effect against S. aureus and E. coli in both suspension and adhesion and its cytotoxicity over time (1 to 24 days). Results show that the AuNRs nano-functionalization improves the antibacterial activity with 100% bacterial reduction after 24 h. The toxicity study, however, indicates a 4.38-fold cell number decrease at 24 days. Although further optimization on nano-functionalization process are needed for cytotoxicity, these data indicated that Au-NRs nano-functionalization is a very promising method for improving the antibacterial properties of HA.

scholarly journals Plasmon-Enhanced Antibacterial Activity of Chiral Gold Nanoparticles and In Vivo Therapeutic Effect

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1621
Author(s):  
Yuelong Xu ◽  
Hongxia Wang ◽  
Min Zhang ◽  
Jianhao Zhang ◽  
Wenjing Yan
Keyword(s):  
Gold Nanoparticles ◽  
Antibacterial Activity ◽  
Intestinal Microflora ◽  
Antibacterial Properties ◽  
Au Nps ◽  
E Coli ◽  
Bacterial Cell Death ◽  
Steric Configuration

d-cysteine (d-cys) has been demonstrated to possess an extraordinary antibacterial activity because of its unique steric configuration. However, inefficient antibacterial properties seriously hinder its wide applications. Here, cysteine-functionalized gold nanoparticles (d-/l-Au NPs) were prepared by loading d-/l-cysteine on the surface of gold nanoparticles for the effective inhibition of Escherichia coli (E. coli) in vitro and in vivo, and the effects on the intestinal microflora in mice were explored during the treatment of E. coli infection in the gut. We found that the antibacterial activity of d-/l-Au NPs was more than 2–3 times higher than pure d-cysteine, l-cysteine and Au NPs. Compared with l-Au NPs, d-Au NPs showed the stronger antibacterial activity, which was related to its unique steric configuration. Chiral Au NPs showed stronger destructive effects on cell membrane compared to other groups, which further leads to the leakage of the cytoplasm and bacterial cell death. The in vivo antibacterial experiment illustrated that d-Au NPs displayed impressive antibacterial activity in the treatment of E. coli-infected mice comparable to kanamycin, whereas they could not affect the balance of intestinal microflora. This work is of great significance in the development of an effective chiral antibacterial agent.

scholarly journals The Three RelE Homologs of Mycobacterium tuberculosis Have Individual, Drug-Specific Effects on Bacterial Antibiotic Tolerance

2010 ◽  
Vol 192 (5) ◽  
pp. 1279-1291 ◽  
Author(s):  
Ramandeep Singh ◽  
Clifton E. Barry ◽  
Helena I. M. Boshoff
Keyword(s):  
Mycobacterium Tuberculosis ◽  
Survival Rates ◽  
Specific Effect ◽  
Multidrug Resistant ◽  
Cross Resistance ◽  
Bacterial Survival ◽  
E Coli ◽  
The Face

ABSTRACT In Escherichia coli, expression of the RelE and HipA toxins in the absence of their cognate antitoxins has been associated with generating multidrug-tolerant “persisters.” Here we show that unlike persisters of E. coli, persisters of Mycobacterium tuberculosis selected with one drug do not acquire cross-resistance to other classes of drugs. M. tuberculosis has three homologs of RelE arranged in operons with their apparent antitoxins. Each toxin individually arrests growth of both M. tuberculosis and E. coli, an effect that is neutralized by coexpression of the cognate antitoxin. Overexpression or deletion of each of the RelE toxins had a toxin- and drug-specific effect on the proportion of bacilli surviving antibiotic killing. All three toxins were upregulated in vivo, but none of the deletions affected survival during murine infection. RelE2 overexpression increased bacterial survival rates in the presence of rifampin in vitro, while deletion significantly decreased survival rates. Strikingly, deletion of this toxin had no discernible effect on the level of persisters seen in rifampin-treated mice. Our results suggest that, in vivo, RelE-generated persisters are unlikely to play a significant role in the generation of bacilli that survive in the face of multidrug therapy or in the generation of multidrug-resistant M. tuberculosis.

scholarly journals The Disulfide Bond of the Peptide Thanatin Is Dispensible for Its Antimicrobial ActivityIn VivoandIn Vitro

2016 ◽  
Vol 60 (7) ◽  
pp. 4283-4289 ◽  
Author(s):  
Bo Ma ◽  
Chao Niu ◽  
Ying Zhou ◽  
Xiaoyan Xue ◽  
Jingru Meng ◽  
...  
Keyword(s):  
Disulfide Bond ◽  
Umbilical Vein ◽  
Low Cost ◽  
Survival Rates ◽  
Antimicrobial Activities ◽  
Bacterial Strains ◽  
Content Type ◽  
E Coli

ABSTRACTThanatin (THA) displays potent antibiotic activity, especially against extended-spectrum-β-lactamase (ESBL)-producingEscherichia colibothin vitroandin vivo, with minimal hemolytic toxicity and satisfactory stability in plasma. However, the high cost of thanatin significantly limits its development and clinical application. To reduce the cost of peptide synthesis, a formulation of cyclic thanatin (C-thanatin) called linear thanatin (L-thanatin) was synthesized and its activity was evaluatedin vivoandin vitro. Results showed that C-thanatin and L-thanatin MICs did not differ against eight Gram-negative and two Gram-positive bacterial strains. Furthermore, the survival rates of ESBL-producing-E. coli-infected mice were consistent after C-thanatin or L-thanatin treatment at 5 or 10 mg/kg of body weight. Neither C-thanatin nor L-thanatin showed toxicity for human red blood cells (hRBCs) and human umbilical vein endothelial cells (HUVECs) at a concentration as high as 256 μg/ml. Results of circular dichroism spectroscopy indicated that the secondary structure of L-thanatin is extremely similar to that of C-thanatin. Membrane permeabilization and depolarization assays showed that C-thanatin and L-thanatin have similar abilities to permeabilize the outer and inner membranes and to induce membrane depolarization in ESBL-producingE. coli. However, neither of them caused significant HUVEC membrane permeability. These findings indicate that the two peptides have similar effects on bacterial cell membranes and that the disulfide bond in thanatin is not essential for its antimicrobial activitiesin vivoandin vitro. L-thanatin is thus a promising low-cost peptide candidate for treating ESBL-producingE. coliinfections.

scholarly journals In Vitro and In Vivo Biological Activity of Berberine Chloride against Uropathogenic E. coli Strains Using Galleria mellonella as a Host Model

Molecules ◽  
2020 ◽  
Vol 25 (21) ◽  
pp. 5010
Author(s):  
Giulio Petronio Petronio ◽  
Marco Alfio Cutuli ◽  
Irene Magnifico ◽  
Noemi Venditti ◽  
Laura Pietrangelo ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Galleria Mellonella ◽  
Biological Activities ◽  
Antibacterial Properties ◽  
In Vivo Model ◽  
Infection Model ◽  
E Coli ◽  
Urinary Infections

Berberine is an alkaloid of the protoberberine type used in traditional oriental medicine. Its biological activities include documented antibacterial properties against a wide variety of microorganisms; nonetheless, its use against Escherichia coli strains isolated from urinary infections has not yet been widely investigated in vivo. The emergence of antimicrobial resistance requires new therapeutic approaches to ensure the continued effectiveness of antibiotics for the treatment and prevention of urinary infections. Moreover, uropathogenic Escherichia coli (UPEC) has developed several virulence factors and resistance to routine antibiotic therapy. To this end, several in vitro and in vivo tests were conducted to assess the activity of berberine on uropathogenic E. coli strains. Galleria mellonella as an infection model was employed to confirm the in vivo translatability of in vitro data on berberine activity and its influence on adhesion and invasion proprieties of E. coli on human bladder cells. In vitro pre-treatment with berberine was able to decrease the adhesive and invasive UPEC ability. In vivo treatment increased the larvae survival infected with UPEC strains and reduced the number of circulating pathogens in larvae hemolymph. These preliminary findings demonstrated the efficacy and reliability of G. mellonella as in vivo model for pre-clinical studies of natural substances.

scholarly journals SCREENING ANTIBACTERIAL EFFECTS OF VIETNAMESE PLANT EXTRACTS AGAINST PATHOGENS CAUSED ACUTE HEPATOPANCREATIC NECROSIS DISEASE IN SHRIMPS

2018 ◽  
Vol 11 (5) ◽  
pp. 77 ◽  
Author(s):  
Hai Thanh Nguyen ◽  
Lua Thi Dang ◽  
Hanh Thi Nguyen ◽  
Hai Ha Hoang ◽  
Ha Thi Ngoc Lai ◽  
...  
Keyword(s):  
High Performance ◽  
Pathogenic Bacteria ◽  
Survival Rates ◽  
Antibacterial Properties ◽  
Piper Betle ◽  
Antibacterial Effects ◽  
Plant Materials ◽  
Acute Hepatopancreatic Necrosis Disease

Objectives: The objectives are aimed to investigate the antibacterial properties of five Vietnamese medicinal plants against acute hepatopancreatic necrosis disease (AHPND)-caused bacterial pathogens, to verify their potentials to apply as a new treatment therapy.Methods: Extracts from plants, such as Psidium guajava leaf, Piper betle L. leaf, Phyllanthus amarus leaf, Rhodomyrtus tomentosa seed, and Allium sativum bulb, were tested against three AHPND-caused bacteria. Agar infusion and broth dilution methods were employed to evaluate extract in vitro antibacterial effects, while experiments with cultured whiteleg shrimps were applied to access their safety when applied in vivo. High-performance liquid chromatography (HPLC) analysis was applied to identify components in the extracts.Results: P. amanus and R. tomentosa extracts exerted the strongest inhibition on tested bacteria. Other extracts, including P. betel and P. guajava, were less effective, while A. sativum showed no effects against bacteria. In safety assessment experiments, we observed that only crude extracts of R. tomentosa and A. satium were safe, while others significantly reduced their survival rates. HPLC showed that extracts of high antibacterial properties had rich phenol constituents. In addition, the phenolic profile of R. tomentosa showed the presence of piceatannol.Conclusion: Considering both of antibacterial effects and safety properties altogether, we concluded that among the five examined plant materials of this study, R. tomentosa had the highest potential to apply in AHPND treatment, as only this plant showed the high effects on pathogenic bacteria while were still safe for host aquatic shrimps.

scholarly journals Fabrication of ultra-small GSH-AgNCs with excellent eschar penetration and antibacterial properties for the healing of burn infection wounds

2021 ◽  
Author(s):  
Peng Yang ◽  
Kang Yang ◽  
Lu Liu ◽  
Chen Li ◽  
Jun Tao ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Antibacterial Properties ◽  
Significant Inhibition ◽  
Burn Wound ◽  
In Vitro Techniques ◽  
E Coli ◽  
Burn Wound Healing ◽  
Diagnostic Applications

Abstract There is evidence of bioburden as a barrier to chronic burn wound healing. Compared to traditional therapy, nanotechnology has availed a revolutionary approach to therapeutic and diagnostic applications in burns. In this article, we developed the glutathione-protected Ag nanoclusters (GSH-AgNCs) to manage burn wound infection. Owing to the specific structure, the GSH-AgNCs emitted strong red fluorescence under UV excitation, quantified via both in vivo and in vitro techniques. The GSH-AgNCs showed a significant inhibition potential on the proliferation of Staphylococcus aureus ( S. aureus ), Escherichia coli ( E. coli ) , Pseudomonas aeruginosa ( P. aeruginosa ) , and methicillin-resistant staphylococcus aureus (MRSA), hiding under the eschar. Of note, with 2-6nm particle size, GSH-AgNCs are effected in renal excretion, advocating for their biomedical and pharmacological applications.

Rapid, Refined, and Robust Method for Expression, Purification, and Characterization of Recombinant Human Amyloid-beta M1-42

2019 ◽  
Author(s):  
Priya Prakash ◽  
Travis Lantz ◽  
Krupal P. Jethava ◽  
Gaurav Chopra
Keyword(s):  
Amyloid Beta ◽  
Western Blots ◽  
Force Microscopy ◽  
E Coli ◽  
Atomic Force ◽  
Set Up ◽  
Short Time

Amyloid plaques found in the brains of Alzheimer’s disease (AD) patients primarily consists of amyloid beta 1-42 (Ab42). Commercially, Ab42 is synthetized using peptide synthesizers. We describe a robust methodology for expression of recombinant human Ab(M1-42) in Rosetta(DE3)pLysS and BL21(DE3)pLysS competent E. coli with refined and rapid analytical purification techniques. The peptide is isolated and purified from the transformed cells using an optimized set-up for reverse-phase HPLC protocol, using commonly available C18 columns, yielding high amounts of peptide (~15-20 mg per 1 L culture) in a short time. The recombinant Ab(M1-42) forms characteristic aggregates similar to synthetic Ab42 aggregates as verified by western blots and atomic force microscopy to warrant future biological use. Our rapid, refined, and robust technique to purify human Ab(M1-42) can be used to synthesize chemical probes for several downstream in vitro and in vivo assays to facilitate AD research.

scholarly journals Functional identification of ygiP as a positive regulator of the ttdA-ttdB-ygjE operon

Microbiology ◽  
2006 ◽  
Vol 152 (7) ◽  
pp. 2129-2135 ◽  
Author(s):  
Taku Oshima ◽  
Francis Biville
Keyword(s):  
Functional Characterization ◽  
Anaerobic Growth ◽  
Functional Identification ◽  
New Members ◽  
E Coli ◽  
Inner Membrane Protein ◽  
Tartrate Dehydratase

Functional characterization of unknown genes is currently a major task in biology. The search for gene function involves a combination of various in silico, in vitro and in vivo approaches. Available knowledge from the study of more than 21 LysR-type regulators in Escherichia coli has facilitated the classification of new members of the family. From sequence similarities and its location on the E. coli chromosome, it is suggested that ygiP encodes a lysR regulator controlling the expression of a neighbouring operon; this operon encodes the two subunits of tartrate dehydratase (TtdA, TtdB) and YgiE, an integral inner-membrane protein possibly involved in tartrate uptake. Expression of tartrate dehydratase, which converts tartrate to oxaloacetate, is required for anaerobic growth on glycerol as carbon source in the presence of tartrate. Here, it has been demonstrated that disruption of ygiP, ttdA or ygjE abolishes tartrate-dependent anaerobic growth on glycerol. It has also been shown that tartrate-dependent induction of the ttdA-ttdB-ygjE operon requires a functional YgiP.

Sign in / Sign up

Export Citation Format

Share Document