scholarly journals Mucosa-Associated Escherichia coli in Colorectal Cancer Patients and Control Subjects: Variations in the Prevalence and Attributing Features

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Roghayeh Nouri ◽  
Alka Hasani ◽  
Kourosh Masnadi Shirazi ◽  
Mohammad Reza Alivand ◽  
Bita Sepehri ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Escherichia Coli ◽  
Microtiter Plate ◽  
Control Group ◽  
Microtiter Plate Assay ◽  
E Coli ◽  
Pcr Method ◽  
Colorectal Cancer Patients ◽  
And Control ◽  
Encoding Genes

Accumulating evidence indicates that specific strains of mucosa-associated Escherichia coli (E. coli) can influence the development of colorectal carcinoma. This study aimed to investigate the prevalence and characterization of mucosa-associated E. coli obtained from the colorectal cancer (CRC) patients and control group. At two referral university-affiliated hospitals in northwest Iran, 100 patients, 50 with CRC and 50 without, were studied over the course of a year. Fresh biopsy specimens were used to identify mucosa-associated E. coli isolates after dithiothreitol mucolysis. To classify the E. coli strains, ten colonies per sample were typed using enterobacterial repetitive intergenic consensus-based PCR (ERIC-PCR). The strains were classified into phylogroups using the quadruplex PCR method. The PCR method was used to examine for the presence of cyclomodulin, bfp, stx1, stx2, and eae-encoding genes. The strains were tested for biofilm formation using the microtiter plate assay. CRC patients had more mucosa-associated E. coli than the control group ( p < 0.05 ). Enteropathogenic Escherichia coli (EPEC) was also found in 23% of CRC strains and 7.1% of control strains ( p < 0.05 ). Phylogroup A was predominant in control group specimens, while E. coli isolates from CRC patients belonged most frequently to phylogroups D and B2. Furthermore, the frequency of cyclomodulin-encoding genes in the CRC patients was significantly higher than the control group. Around 36.9% of E. coli strains from CRC samples were able to form biofilms, compared to 16.6% E. coli strains from the control group ( p < 0.05 ). Noticeably, cyclomodulin-positive strains were more likely to form biofilm in comparison to cyclomodulin-negative strains ( p < 0.05 ). In conclusion, mucosa-associated E. coli especially cyclomodulin-positive isolates from B2 and D phylogroups possessing biofilm-producing capacity colonize the gut mucosa of CRC patients.

scholarly journals Reduction of Escherichia coli O157:H7 Populations in Cattle by Addition of Colicin E7-Producing E. coli to Feed

2004 ◽  
Vol 70 (10) ◽  
pp. 6053-6060 ◽  
Author(s):  
Gerry P. Schamberger ◽  
Ronald L. Phillips ◽  
Jennifer L. Jacobs ◽  
Francisco Diez-Gonzalez
Keyword(s):  
Escherichia Coli ◽  
Statistical Significance ◽  
Control Group ◽  
Control Groups ◽  
Tissue Samples ◽  
Fecal Shedding ◽  
E Coli ◽  
Colicin E7 ◽  
Maximum Decrease ◽  
And Control

ABSTRACT A cattle trial using artificially inoculated calves was conducted to determine the effect of the addition of colicinogenic Escherichia coli strains capable of producing colicin E7 (a 61-kDa DNase) to feed on the fecal shedding of serotype O157:H7. The experiment was divided into three periods. In period 1, which lasted 24 days, six calves were used as controls, and eight calves received 107 CFU of E. coli (a mixture of eight colicinogenic E. coli strains) per g of feed. Both groups were orally inoculated with nalidixic acid-resistant E. coli O157:H7 strains 7 days after the treatment started. In periods 2 and 3, the treatment and control groups were switched, and the colicinogenic E. coli dose was increased 10-fold. During period 3, which lasted as long as period 1, both groups were reinoculated with E. coli O157:H7. The numbers of E. coli O157:H7 were consistently greater in the control groups during the three periods, but comparisons within each time period determined a statistically significant (P < 0.05) difference only at day 21 of period 1. However, when the daily average counts were compared between the period 1 control group and the period 3 treatment group that included the same six animals, an overall reduction of 1.1 log10 CFU/g was observed, with a maximum decrease of 1.8 log10 CFU/g at day 21 (overall statistical significance, P = 0.001). Serotype O157:H7 was detected in 44% of the treatment group's intestinal tissue samples and in 64% of those from the control group (P < 0.04). These results indicated that the daily addition of 108 CFU of colicin E7-producing E. coli per gram of feed could reduce the fecal shedding of serotype O157:H7.

scholarly journals Evaluating the Five Escherichia coli Derivative Strains as Platform for Arginine Deiminase Overproduction

2020 ◽  
Author(s):  
Sara Abdollahi ◽  
Mohammad Hossein Morowvat ◽  
Amir Savardashtaki ◽  
Cambyz Irajie ◽  
Sohrab Najafipour ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Recombinant Protein ◽  
Microtiter Plate ◽  
Arginine Deiminase ◽  
Expression Vectors ◽  
Efficacy Evaluation ◽  
Microtiter Plate Assay ◽  
E Coli ◽  
Bacterial Enzyme ◽  
Host Strains

Abstract Escherichia coli is one of the most preferred host microorganisms for the production of recombinant proteins due to its well-characterized genome, availability of various expression vectors and host strains. Choosing a proper host strain for the overproduction of a desired recombinant protein is very important because of the diversity of genetically modified expression strains. This study attempted to evaluate the five host strains including BL21 (DE3), Rosetta (DE3), DH5α, XL1-BLUE and SHuffle in terms of arginine deiminase (ADI) production and enzyme activity. Arginine deiminase (ADI) was chosen a bacterial enzyme which degrades L-arginine. It is effective in treatment of some types of human cancers like melanoma and hepatocellular carcinoma (HCC) which are arginine-auxotrophic. Five mentioned E. coli strains were cultivated. The pET-3a was used as the expression vector. The competent E. coli cells were obtained through CaCl 2 method. It was then transformed with the construct of pET3a-ADI using heat shock strategy. The ADI production levels were examined by 10% SDS-PAGE analysis. The ability of host strains for expression of the requested recombinant protein was compared. The enzymatic activity of the obtained recombinant ADI from each studied strain was assessed by a colorimetric 96-well microtiter plate assay. All the five strains exhibited a significant band at 46 kDa. BL21 (DE3) produced the highest amount of ADI protein followed by Rosetta (DE3). The following activity assay showed that ADI from BL21 (DE3) and Rosetta (DE3) had the most activity. There are some genetic and metabolic differences among the various E. coli strains, leading to differences in the amount of recombinant protein production. The results of this study can be used for the efficacy evaluation of the five studied strains for the production of similar pharmaceutical enzymes. The strains also could be analyzed in terms of proteomics.

scholarly journals Identification of Quinolone and Colistin Resistance Genes in Escherichia Coli Strains Isolated from Mucosal Samples of Patients with Colorectal Cancer and Healthy Subjects

2020 ◽  
Vol 15 (1) ◽  
pp. 30-40
Author(s):  
Hassan Mahmoudi ◽  
Sima Ghiasvand ◽  
Omid Zarei ◽  
Hadi Hossainpour ◽  
Mohammad Y. Alikhani
Keyword(s):  
Colorectal Cancer ◽  
Escherichia Coli ◽  
Antibiotic Resistance ◽  
Cancer Patients ◽  
Resistance Genes ◽  
Healthy People ◽  
Disk Diffusion Test ◽  
E Coli ◽  
Genes Encoding ◽  
Colorectal Cancer Patients

Introduction: : Antibiotic resistance and extensive use of antibiotics are amongst the major causes of failure in antibiotic treatment. The purpose of this study was to investigate antibiotic resistance patterns and to identify resistance genes of quinolones and colistin in Escherichia coli. There are a very few patents on E. coli isolated from colorectal cancer. So, this study demonstrates that some bacteria resistant to ciprofloxacin have not resistance genes.Moreover, new patterns for E. coli are presented for isolates of patients with colorectal cancer. Materials and Methods: : Of the three healthy people, inflammatory bowel diseases (IBD) patients and colorectal cancer patients, 40 E. coli strains isolated after confirmation by biochemical and molecular methods. The susceptibility of isolates to antibiotics was investigated using disk diffusion test. After deoxyribonucleic acid (DNA) extraction, polymerase chain reaction (PCR) was used to identify genes encoding resistance to ciprofloxacin (qnr A, qnr B) and colistin (mcr-1). Results:: The results showed that E. coli isolates from colorectal cancer patients had the highest resistance to piperacillin (67.5%), ceftazidime (47.5%), and cefepime (42.5%). Also, E. coli strains isolated from IBD patients showed resistance to antibiotic ceftazidime 13%. More than 95% of E. coli strains isolated from healthy people were susceptible to antibiotics. Based on the results, 18 (15%) E. coli strains showed resistance to ciprofloxacin. The qnr A gene was detected in 61.11% isolates; however, qnr B was detected in 9 (50%) isolates. Isolates resistant to colistin were not observed. Conclusion: : These findings indicate increased resistance of E. coli to ciprofloxacin in comparison with prior studies. Further research in this field will increase our knowledge and more effective exposure to the antibiotic resistance of the pathogenic microorganisms.

Comparative Effect of Direct-Fed Microbials on Fecal Shedding of Escherichia coli O157:H7 and Salmonella in Naturally Infected Feedlot Cattle

2008 ◽  
Vol 71 (3) ◽  
pp. 539-544 ◽  
Author(s):  
EBOT S. TABE ◽  
JAMES OLOYA ◽  
DAWN K. DOETKOTT ◽  
MARC L. BAUER ◽  
PENELOPE S. GIBBS ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Feedlot Cattle ◽  
Control Group ◽  
Escherichia Coli O157 ◽  
Comparative Effect ◽  
Laboratory Methods ◽  
Fecal Shedding ◽  
E Coli ◽  
Feedlot Steers ◽  
And Control

The effect of direct-fed microbials (DFM) on fecal shedding of Escherichia coli O157:H7 and Salmonella in naturally infected feedlot cattle was evaluated in a clinical trial involving 138 feedlot steers. Following standard laboratory methods, fecal samples collected from steers were evaluated for change in the detectable levels of E. coli O157:H7 and Salmonella shed in feces after DFM treatment. Sampling of steers was carried out every 3 weeks for 84 days. A significant reduction (32%) in fecal shedding of E. coli O157:H7 (P &lt; 0.001), but not Salmonella (P = 0.24), was observed among the treatment steers compared with the control group during finishing. The probability of recovery of E. coli O157:H7 from the feces of treated and control steers was 34.0 and 66.0%, respectively. Steers placed on DFM supplement were almost three times less likely to shed E. coli O157:H7 (odds ratio, 0.36; 95% confidence interval, 0.25 to 0.53; P &lt; 0.001) in their feces as opposed to their control counterparts. The probability of recovery of Salmonella from the feces of the control (14.0%) and the treated (11.3%) steers was similar. However, the DFM significantly reduced probability of new infections with Salmonella among DFM-treated cattle compared with controls (nontreated ones). It appears that DFM as applied in our study are capable of significantly reducing fecal shedding of E. coli O157:H7 in naturally infected cattle but not Salmonella. The factors responsible for the observed difference in the effects of DFM on E. coli O157:H7 and Salmonella warrants further investigation.

scholarly journals The Effect of Education Provided to Family Members Caring for Colorectal Cancer Patients on Caregiving Reactions and Healthy Lifestyle Behaviors: A Prospective Quasi-Experimental Study

2021 ◽  
Author(s):  
nilay bektas akpınar ◽  
Tulin Beduk ◽  
Filiz Cay Senler
Keyword(s):  
Colorectal Cancer ◽  
Healthy Lifestyle ◽  
Control Group ◽  
Lifestyle Behaviors ◽  
Healthy Lifestyle Behaviors ◽  
Post Test ◽  
Quasi Experimental ◽  
Colorectal Cancer Patients ◽  
And Control ◽  
Experimental Group

Abstract Purpose: To evaluate the effects of the educational package provided to enhance family caregivers' experience of colorectal cancer patients receiving chemotherapy on healthy lifestyle and caregiving reactions.Methods: The study was conducted as a pre-test-post-test, quasi-experimental intervention with a control group. The study population consisted of 100 caregivers who provide primary care to patients with colorectal cancer. The data were collected using the "Socio-Demographic Characteristics Data Collection Form", the "Healthy Lifestyle Behaviors Scale-II", and the "Caregiver Reaction Assessment” forms. The pre-test was applied to the experimental and control groups at the first interview. After the preliminary interview, the experimental group was applied three times to face-to-face individual educational sessions through the education booklet prepared by taking the opinions of 5 academician nurses who are experts in the oncology field. The post-test then was applied to the caregivers in the experimental and control groups.Results: After the education provided to the experimental group, a positive change was observed in the mean scores of all sub-dimensions of Healthy Lifestyle Behaviors Scale-II except for the physical sub-dimension. In the control group, there was a statistically significant negative change in the post-test mean scores in all sub-dimensions of the Caregiver Reaction Assessment Scale. Lack of family support in caregivers negatively affected interpersonal relationships, nutrition, health responsibility, and spiritual growth.Conclusion: In order to reduce the problems in family members, it is important to interact with a multidisciplinary approach not only with the patient but also with the caregivers during the chemotherapy process. Clinical Trials Identifier; NCT04791982, 10.03.2021, retrospectively registered

scholarly journals The Escherichia coli Efflux Pump TolC Promotes Aggregation of Enteroaggregative E. coli 042

2007 ◽  
Vol 76 (3) ◽  
pp. 1247-1256 ◽  
Author(s):  
Naoko Imuta ◽  
Junichiro Nishi ◽  
Koichi Tokuda ◽  
Rika Fujiyama ◽  
Kunihiro Manago ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Outer Membrane ◽  
Efflux Pump ◽  
Microtiter Plate ◽  
Virulence Plasmid ◽  
Wild Type ◽  
Planktonic Cells ◽  
Microtiter Plate Assay ◽  
E Coli ◽  
Aggregative Adherence

ABSTRACT Enteroaggregative Escherichia coli (EAEC) is an emerging enteric pathogen in both developing and industrialized countries. EAEC is defined as a diarrheal pathogen based on its characteristic aggregative adherence to HEp-2 cells in culture and its biofilm formation on the intestinal mucosa. We have reported that the novel protein AatA, which is encoded on the EAEC virulence plasmid pAA2, localizes to the outer membrane and facilitates export of the dispersin Aap across the outer membrane. Because AatA is an E. coli efflux pump TolC homolog, we investigated the role of TolC in the virulence of EAEC. No difference in Aap secretion was observed between the wild type and its tolC mutant (042tolC). However, characteristic aggregation in high-glucose Dulbecco's minimal essential medium for the wild type was diminished for 042tolC. In a microtiter plate assay, there were significantly more planktonic cells for 042tolC than for the wild type, while there were significantly fewer spontaneously precipitated cells on the substratum for 042tolC than for the wild type. In a HEp-2 cell adherence test, 042tolC showed less aggregative adherence than did the wild type. The strong aggregation and aggregative adherence were restored in the complement strain with tolC. In a transwell assay, planktonic cells of 042tolC decreased when cocultured with the wild type or the complement, while precipitated cells of 042tolC increased when cocultured with them. These results suggest that TolC promotes the aggregation and adhesion of EAEC 042 by secreting an assumed humoral factor.

scholarly journals Adamalysines as Biomarkers and a Potential Target of Therapy in Colorectal Cancer Patients: Preliminary Results

2019 ◽  
Vol 2019 ◽  
pp. 1-7 ◽  
Author(s):  
Katarzyna Walkiewicz ◽  
Joanna Strzelczyk ◽  
Dariusz Waniczek ◽  
Krzysztof Biernacki ◽  
Małgorzata Muc-Wierzgoń ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Cancer Patients ◽  
Distant Metastases ◽  
Serum Levels ◽  
Control Group ◽  
Colorectal Cancer Patients ◽  
And Control ◽  
The Relationship ◽  
Increased Activity

Colorectal cancer is one of the most common cancers in the world. Due to its still undetermined pathogenesis, we are searching for signaling pathways that are important in the development of colorectal cancer. In this article, we present results of study on the role of ADAM proteins in colorectal cancer. The study included 85 adult colorectal cancer patients (48 men, 37 women) and 25 patients in the control group (after diagnostic colonoscopy—without cancer). During hospitalization, a serum sample (3 cm3) was collected from the study and control group, anthropometric measurements were conducted and others clinical data were analyzed. In the serum ADAM10, 12, 17, and 28, protein concentrations were determined and, in the next step, examined the relationship between ADAMs concentrations and selected clinical parameters in both groups. The analysis showed that serum levels of ADAM10 and ADAM28 are significantly higher in patients with colorectal cancer and correlate with histopathological grading and with presence of distant metastases. Moreover, noticed the trend to correlate concentrations of adamalysines with higher BMI score. One of the functions of adamalysines is the activation of growth factors involved in cancer, including IGF and TNFα. The increased activity of adamalysines in patients may play a role in the pathogenesis of colorectal cancer. Our study highlights the prevalence of metabolic disorders in the group of patients with diagnosed CRC, and this cancer seems to be a further complication of obesity.

scholarly journals Chemical Composition and Antibacterial Activity of Angelica archangelica Root Essential Oil

2017 ◽  
Vol 12 (2) ◽  
pp. 1934578X1701200 ◽  
Author(s):  
Milica G. Aćimović ◽  
Snežana Đ. Pavlović ◽  
Ana O. Varga ◽  
Vladimir M. Filipović ◽  
Mirjana T. Cvetković ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Antibacterial Activity ◽  
Essential Oil ◽  
Inhibitory Concentration ◽  
Microtiter Plate ◽  
Microtiter Plate Assay ◽  
Natural Preservative ◽  
E Coli ◽  
Angelica Archangelica ◽  
Root Essential Oil

Roots of wild growing Angelica archangelica L. from Mt. Ozren (Serbia) were subjected to hydrodistillation and GC-MS analysis. The roots contained 0.10% of essential oil with α-pinene (29.7%), δ-3-carene (14.2%), and a mixture of β-phellandrene and limonene (13.2%) as main compounds. The modified resazurin microtiter-plate assay was used to evaluate the antibacterial activity of the essential oil against Staphylococcus aureus and Escherichia coli. The minimum inhibitory concentration (MIC) values were 14.2 μL/mL for S. aureus and 28.4 μL/mL for E. coli, while the minimum bactericidal concentrations (MBC) were 56.8 μL/mL and 113.6 μL/mL, respectively. According to the obtained results, the angelica root essential oil can be applied as a natural preservative in food and as a natural antibiotic for the treatment of several infectious diseases caused by these two bacteria.

scholarly journals Toxicity of 32.2 kDa MW Escherichia coli Pili Adhesin Isolated from Infertile Male Semen in Reproductive System

2018 ◽  
Vol 54 (2) ◽  
pp. 146
Author(s):  
Sukarjati Sukarjati ◽  
Susie Amilah ◽  
Sudjarwo Sudjarwo
Keyword(s):  
Escherichia Coli ◽  
Dna Damage ◽  
Reproductive System ◽  
Assay Method ◽  
Control Group ◽  
Infertile Male ◽  
Infection Group ◽  
E Coli ◽  
Immunization Group ◽  
And Control

Escherichia coli (E. coli) is the leading cause of male genital tract infection with no symptoms of infertility. Protein E. coli pili hemagglutinin isolated from infertile male sperm with 32.2 kDa MW acts as adhesion in spermatozoa. This study aimed to prove whether E. coli pili adhesin 32.2 kDa MW is toxic to male reproductive system. Samples consisted of spermatozoa of 30 guinea pigs divided into three groups: control, immunized with E. coli pili adhesin 32.2 kDa MW protein, and transurethral infected E. coli. Observations of sperm motility, vitality and morphology were performed under a microscope. MDA levels and sperm DNA damage were measured by a spectrophotometer and comet assay method and observed using a fluorescent microscope. There was no difference between control and immunization group of E. coli pili adhesin in motility (p=0.499), vitality (p=0.817) and morphology (p=0.176); between control and transuretral infection groups in motility (p=0.000), vitality (p=0.000) and morphology (p=0.000); and between control and both treatment groups in motility (p=0.001), vitality (p=0,000) and morphology (p=0.000). Histologic analysis showed E. coli pili adhesin of 32.2 kDa MW immunization group did not suffer from testicular tissue damage, while the positive group showed a deterioration of seminiferous tubular cells. MDA levels differed between immunization group E. coli pili, transurethral infection group, and control (p=0.024) and between transurethral and control (p=0.007) groups. However, between control and immunized group with E. coli pili protein showed no difference (p=0.251). DNA damage differed (p=0.000) between immunized group with E. coli pili, transurethral infection and control group; between control and transurethral infected group (p=0.000); and between transurethral infection group and E. coli pili protein immunization group (p=0.000). However, between control and E. coli pili immunization group showed no difference (p=0.600). In conclusion, E. coli pili adhesin 32.2 kDa MW protein is not toxic for sperm quality and the quality of sperm molecules.

Safety of intraoperative chemotherapy with 5-FU for colorectal cancer patients receiving curative resection: A randomized, multicenter, prospective, phase III IOCCRC trial (IOCCRC).

2017 ◽  
Vol 35 (15_suppl) ◽  
pp. e15002-e15002
Author(s):  
Rong-xin Zhang ◽  
Jun-zhong Lin ◽  
Gong Chen ◽  
Li-ren LI ◽  
Zhen-hai LU ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Side Effects ◽  
Cancer Patients ◽  
Surgical Resection ◽  
Control Group ◽  
Control Groups ◽  
Safety And Efficacy ◽  
Colorectal Cancer Patients ◽  
And Control ◽  
Intraoperative Chemotherapy

e15002 Background: The safety and efficacy of intraoperative chemotherapy in colorectal cancer have not yet been extensively investigated. This randomized control trial was designed to compare the safety and efficacy of intraoperative chemotherapy in combination with surgical resection to those of traditional surgical resection alone. Patients and Methods: From January 2011 to January 2016, 696 colorectal cancer patients were enrolled in this study: 341 patients were randomly assigned to the intraoperative plus surgery group to receive intraoperative chemotherapy (portal vein, intraluminal, and intraperitoneal chemotherapy plus surgical resection), whereas 344 patients were randomized to the control group to undergo surgery alone. Eleven patients withdrew consent. Surgical complications and side effects of intraoperative chemotherapy were compared between the two groups. Results: Intraoperative chemotherapy did not increase the rate of surgical complications, and no severe chemotherapy-associated side effects were observed. There were no significant differences in the length of hospital stay (8.31 vs. 7.98 days, P = 0.138), length of surgery (170.4 vs. 167.0 min, P = 0.526), length of antibiotic use (2.28 vs. 2.15 days, P = 0.322), or length of drain usage (6.37 vs. 6.16 days, P = 0.387) between the intraoperative chemotherapy and control groups. Four patients in each of the intraoperative chemotherapy and the control groups experienced anastomotic leakage and underwent a second operation (1.2% vs. 1.2%, P = 0.99). There were no deaths within 90 days after surgery in the chemotherapy group, whereas one patient died in the control group (0% vs. 0.3%, P = 0.99). Intraoperative chemotherapy did not decrease the rate of patients who received postoperative adjuvant chemotherapy between the intraoperative group and control group (29.3% vs. 30.2%, P = 0.795). Conclusions: Intraoperative chemotherapy can be safely performed during colorectal surgery; however, follow-up is necessary for a better assessment of its efficacy. Register Number: NCT01465451. Clinical trial information: NCT01465451.

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