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Multi-Drug resistance

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https://www.readbyqxmd.com/read/28938696/the-molecular-mechanisms-of-chemoresistance-in-cancers
#1
REVIEW
Hua-Chuan Zheng
Overcoming intrinsic and acquired drug resistance is a major challenge in treating cancer patients because chemoresistance causes recurrence, cancer dissemination and death. This review summarizes numerous molecular aspects of multi-resistance, including transporter pumps, oncogenes (EGFR, PI3K/Akt, Erk and NF-κB), tumor suppressor gene (p53), mitochondrial alteration, DNA repair, autophagy, epithelial-mesenchymal transition (EMT), cancer stemness, and exosome. The chemoresistance-related proteins are localized to extracellular ligand, membrane receptor, cytosolic signal messenger, and nuclear transcription factors for various events, including proliferation, apoptosis, EMT, autophagy and exosome...
August 29, 2017: Oncotarget
https://www.readbyqxmd.com/read/28937965/artemin-promotes-oncogenicity-metastasis-and-drug-resistance-in-cancer-cells
#2
Kamal Hezam, Jiahao Jiang, Fumou Sun, Xinrong Zhang, Juan Zhang
Artemin (ARTN) is a member of glial cell line-derived neurotrophic factor (GDNF) family of ligands, and its signaling is mediated via a multi-component receptor complex including the glycosylphosphatidylinositol-anchored GDNF family receptors a (GFRa1, GFRa3) and RET receptor tyrosine kinase. The major mechanism of ARTN action is via binding to a non-signaling co-receptor. The major function of ARTN is to drive the molecule to induce migration and axonal projection from sympathetic neurons. It also promotes the survival, proliferation and neurite outgrowth of sympathetic neurons in vitro...
September 22, 2017: Reviews in the Neurosciences
https://www.readbyqxmd.com/read/28937624/therapeutic-mechanisms-of-vernonia-amygdalina-delile-in-the-treatment-of-prostate-cancer
#3
William Johnson, Paul B Tchounwou, Clement G Yedjou
Prostate cancer patients have been suffering from limited treatment options due to late diagnosis, poor drug tolerance, and multi-drug resistance to almost all the current drug treatments. Therefore, it is important to seek a new alternative therapeutic medicine that can effectively prevent the disease and even eradicate the progression and metastasis of prostate cancer. Vernonia amygdalina Delile (VAD) is a common edible vegetable in Cameroon that has been used as a traditional medicine for some human diseases...
September 22, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28936851/-research-of-reversal-effect-of-pesv-to-multi-drug-resistance-of-leukemia-stem-cell
#4
Xiang-Dong Yang, Xing-Li Wang, Wen-Hua Yang, Lei Zhao, Tian-Gai Yan
Using the BALB/c mouse multidrug resistance model of leukemia, the effect of peptide extract from scorpion venom (PESV) to the upstream signal factors of P-gp of MDR leukemia stem cells on the mouse tumor block was observed, and the mechanism of PESV to reverse the MDR of LSC was studied. At the same time, the expression of P-gp, MDR1 mRNA and PI3-K, NF-κB were respectively detected through flow cytometry, RT-PCR, Western blot and Elisa, and the mouse liver, spleen were examined via histopathological methods...
December 2016: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/28936051/bacterial-contamination-of-multi-dose-eye-drops-at-ophthalmology-department-university-of-gondar-northwest-ethiopia
#5
Asegedech Tsegaw, Asamere Tsegaw, Tefera Abula, Yared Assefa
PURPOSE: Ophthalmic solutions used for both diagnostic and therapeutic purposes were found to be contaminated with bacteria pathogens and caused serious ocular infections such as keratitis and endophthalmitis. The objective was to assess the magnitude and pattern of bacterial contamination of multi-dose ophthalmic medications and investigate the drug susceptibility pattern of the isolates in the Department of Ophthalmology at Gondar University Teaching Hospital. METHODS: A total of 100 ophthalmic medications in-use by patients and eye-care workers have been taken and cultured for potential bacterial contamination in the Microbiology Department after 1 week and >1 week of use...
April 2017: Middle East African Journal of Ophthalmology
https://www.readbyqxmd.com/read/28935900/antibacterial-and-immunomodulatory-activities-of-insect-defensins-dlp2-and-dlp4-against-multidrug-resistant-staphylococcus-aureus
#6
Zhanzhan Li, Ruoyu Mao, Da Teng, Ya Hao, Huixian Chen, Xiumin Wang, Xiao Wang, Na Yang, Jianhua Wang
Methicillin-resistant Staphylococcus aureus (MRSA), are the most frequent cause of sepsis, which urgently demanding new drugs for treating infection. Two homologous insect CSαβ peptides-DLP2 and DLP4 from Hermetia illucens were firstly expressed in Pichia pastoris, with the yields of 873.5 and 801.3 mg/l, respectively. DLP2 and DLP4 displayed potent antimicrobial activity against Gram-positive bacteria especially MRSA and had greater potency, faster killing, and a longer postantibiotic effect than vancomycin...
September 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28934511/multi-drug-resistant-surgical-site-infection-due-to-mycobacterium-abscessus-complex
#7
Richa Misra, Vidhi Jain, Nidhi Tejan, Aarti Negi, Jyoti Umrao, Tapan Nirodhechand Dhole
M. abscessus complex is notoriously resistant to most antimicrobial agents. The complex is differentiated into 3 subspecies: M. abscessus subsp. abscessus, M. abscessus subsp. massiliense, and M. abscessus subsp. bolletii. Skin and soft tissue infections due to this organism can be acquired by direct contact with contaminated material through traumatic injury, surgical wound and environmental exposure or by secondary involvement of skin/soft tissue during disseminated disease. We report a case of Mycobacterium abscessus infection recovered from a post-operative mid-line abdominal wound to illustrate the diagnostic and management difficulties encountered in such patients...
August 1, 2017: Laboratory Medicine
https://www.readbyqxmd.com/read/28934275/activation-of-phosphatidylinositol-3-kinase-akt-snail-signaling-pathway-contributes-to-epithelial-mesenchymal-transition-induced-multi-drug-resistance-to-sorafenib-in-hepatocellular-carcinoma-cells
#8
Jiejie Dong, Bo Zhai, Weihua Sun, Fengli Hu, Hao Cheng, Jun Xu
Sorafenib, an orally available kinase inhibitor, is the standard first-line systemic drug for advanced hepatocellular carcinoma (HCC), and it exerts potent inhibitory activity against epithelial-mesenchymal transition (EMT) and multidrug resistance (MDR) by inhibiting mitogen-activated protein kinase (MAPK) signaling in HCC. However, after long-term exposure to sorafenib, HCC cells exhibit EMT and resistance to sorafenib. The activation of AKT by sorafenib is thought to be responsible for the development of these characteristics...
2017: PloS One
https://www.readbyqxmd.com/read/28933413/the-role-of-the-nrf2-are-antioxidant-system-in-preventing-cardiovascular-diseases
#9
REVIEW
Robert E Smith, Kevin Tran, Cynthia C Smith, Miranda McDonald, Pushkar Shejwalkar, Kenji Hara
It is widely believed that consuming foods and beverages that have high concentrations of antioxidants can prevent cardiovascular diseases and many types of cancer. As a result, many articles have been published that give the total antioxidant capacities of foods in vitro. However, many antioxidants behave quite differently in vivo. Some of them, such as resveratrol (in red wine) and epigallocatechin gallate or EGCG (in green tea) can activate the nuclear erythroid-2 like factor-2 (Nrf2) transcription factor...
November 11, 2016: Diseases (Basel)
https://www.readbyqxmd.com/read/28933264/from-a-better-understanding-of-the-mechanisms-of-action-of-histone-deacetylases-inhibitors-to-the-progress-of-the-treatment-of-malignant-lymphomas-and-plasma-cell-myeloma
#10
Romeo-Gabriel Mihăilă
BACKGROUND: Notable progress has been made in chemo- and immunotherapy of B-cell lymphomas, but less in the treatment of T-cell lymphomas. OBJECTIVE: Histone deacetylases inhibitors are a potentially useful therapeutic mean, as an epigenetic dysregulation is present in lymphomas, and especially in T-cell types. We aimed to study the progress made in this area. METHOD: A minireview was achieved using the articles published in PubMed in the last two years and the new patents made in this field...
September 19, 2017: Recent Patents on Anti-cancer Drug Discovery
https://www.readbyqxmd.com/read/28932278/assessment-of-antibiotic-susceptibility-in-lactobacillus-isolates-from-chickens
#11
Marta Dec, Renata Urban-Chmiel, Dagmara Stępień-Pyśniak, Andrzej Wernicki
BACKGROUND: The aim of this study was to determine the susceptibility of 88 Lactobacillus isolates derived from chickens to antibiotic substances and to detect drug-resistance genes. RESULTS: The minimal inhibitory concentration of 13 antimicrobial substances was determined by the broth microdilution method, and resistance genes were detected by PCR. We recorded a high prevalence of resistance to tiamulin (90% resistant isolates), tetracyclines (74%) and lincomycin (70%), and a moderately high frequency of resistance to enrofloxacin (48%), macrolides (42%), aminoglycosides (12...
2017: Gut Pathogens
https://www.readbyqxmd.com/read/28928941/computational-design-of-molecular-motors-as-nanocircuits-in-leishmaniasis
#12
Dipali Kosey, Shailza Singh
Cutaneous leishmaniasis is the most common form of lesihmaniasis, caused by Leishmania major and is spread by the bite of a sandfly .This species infects the macrophages and dendritic cells Due to multi-drug resistance, there is a need for a new therapeutic technique. Recently, a novel molecular motor of Leishmania, Myosin XXI, was classified and characterized. In addition, the drug resistance in this organism has been linked with the overexpression of ABC transporters. Systems biology aims to study the simulation and modeling of natural biological systems whereas synthetic biology deals with building novel and artificial biological parts and devices  Together they have contributed enormously to drug discovery, vaccine design and development, infectious disease detection and diagnostics...
2017: F1000Research
https://www.readbyqxmd.com/read/28928474/using-experimental-evolution-to-identify-druggable-targets-that-could-inhibit-the-evolution-of-antimicrobial-resistance
#13
Heer H Mehta, Amy G Prater, Yousif Shamoo
With multi-drug and pan-drug-resistant bacteria becoming increasingly common in hospitals, antibiotic resistance has threatened to return us to a pre-antibiotic era that would completely undermine modern medicine. There is an urgent need to develop new antibiotics and strategies to combat resistance that are substantially different from earlier drug discovery efforts. One such strategy that would complement current and future antibiotics would be a class of co-drugs that target the evolution of resistance and thereby extend the efficacy of specific classes of antibiotics...
September 20, 2017: Journal of Antibiotics
https://www.readbyqxmd.com/read/28927405/the-use-of-respondent-driven-sampling-to-assess-malaria-knowledge-treatment-seeking-behaviours-and-preventive-practices-among-mobile-and-migrant-populations-in-a-setting-of-artemisinin-resistance-in-western-cambodia
#14
Po Ly, Julie Thwing, Colleen McGinn, Cesia E Quintero, Narann Top-Samphor, Najibullah Habib, Jack S Richards, Sara E Canavati, Seshu Babu Vinjamuri, Chea Nguon
BACKGROUND: Multi-drug-resistant Plasmodium falciparum threatens malaria elimination efforts in Cambodia and the Greater Mekong Subregion (GMS). Malaria burden in the GMS is higher among certain high-risk demographic groups in Cambodia, especially among migrant and mobile populations (MMPs). This respondent driven sampling (RDS) study was conducted in order to determine malaria knowledge, treatment-seeking behaviours and preventive practices among two MMP groups in Western Cambodia. METHODS: An RDS survey of MMPs was implemented in four purposively-selected communes along the Thai-Cambodia border; two in Veal Veang District and two in Pailin Province, chosen due to their sizeable MMP groups, their convenience of access, and their proximity to Thailand, which allowed for comparison with RDS studies in Thailand...
September 19, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28926883/-etiological-analysis-and-in-vitro-drug-sensitivity-of-bacterial-keratitis-in-northern-china-in-the-period-of-2006-2015
#15
Y Zhang, Z Q Wang, X G Sun
Objective: To analyze the etiology and drug sensitivity of bacterial keratitis and their changes, and to provide evidence for treatment and drug selection of bacterial keratitis. Methods: Retrospective case series study. From January 2006 to December 2015, corneal specimens suspected of bacterial infection were collected and cultured in Beijing Tongren Eye Center. General information of patients, etiological results and drug sensitivity test results were summarized and analyzed. The Chi-square test and Spearman correlation analysis were performed using SPSS 20...
September 11, 2017: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/28926571/whole-genome-sequencing-illuminates-the-evolution-and-spread-of-multidrug-resistant-tuberculosis-in-southwest-nigeria
#16
Madikay Senghore, Jacob Otu, Adam Witney, Florian Gehre, Emma L Doughty, Gemma L Kay, Phillip Butcher, Kayode Salako, Aderemi Kehinde, Nneka Onyejepu, Emmanuel Idigbe, Tumani Corrah, Bouke de Jong, Mark J Pallen, Martin Antonio
Nigeria has an emerging problem with multidrug-resistant tuberculosis (MDR-TB). Whole-genome sequencing was used to understand the epidemiology of tuberculosis and genetics of multi-drug resistance among patients from two tertiary referral centers in Southwest Nigeria. In line with previous molecular epidemiology studies, most isolates of Mycobacterium tuberculosis from this dataset belonged to the Cameroon clade within the Euro-American lineage. Phylogenetic analysis showed this clade was undergoing clonal expansion in this region, and suggests that it was involved in community transmission of sensitive and multidrug-resistant tuberculosis...
2017: PloS One
https://www.readbyqxmd.com/read/28923544/modulation-of-oncogenic-transcription-factors-by-bioactive-natural-products-in-breast-cancer
#17
REVIEW
Mohadeseh Hasanpourghadi, Ashok Kumar Pandurangan, Mohd Rais Mustafa
Carcinogenesis, a multi-step phenomenon, characterized by alterations at genetic level and affecting the main intracellular pathways controlling cell growth and development. There are growing number of evidences linking oncogenes to the induction of malignancies, especially breast cancer. Modulations of oncogenes lead to gain-of-function signals in the cells and contribute to the tumorigenic phenotype. These signals yield a large number of proteins that cause cell growth and inhibit apoptosis. Transcription factors such as STAT, p53, NF-κB, c-JUN and FOXM1, are proteins that are conserved among species, accumulate in the nucleus, bind to DNA and regulate the specific genes targets...
September 15, 2017: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/28923459/complete-sequence-of-pbm413-a-novel-multi-drug-resistance-megaplasmid-carrying-qnrvc6-and-blaimp-45-from-pseudomonas-aeruginosa
#18
Junyan Liu, Ling Yang, Dingqiang Chen, Brian M Peters, Lin Li, Bing Li, Zhenbo Xu, Mark E Shirtliff
This study aimed to characterize a novel multi-drug-resistance megaplasmid carrying qnrVC6 and blaIMP-45 from Pseudomonas aeruginosa strain Guangzhou-Pae617 isolated from a hospital in Guangzhou, China in 2012. The plasmid pBM413 has a length of 423,017 bp and an average G+C content of 56.41%. A qnrVC6 gene flanked by two copies of ISCR1 elements, a multiresistance class 1 integron In786 containing aacA4→blaIMP-45→blaOXA-1→catB3 cassettes, an armA gene and an aphA7 gene flanked by two copies of IS26 elements were identified...
September 15, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/28920793/multi-drug-resistance-patterns-of-enteric-bacteria-in-two-populations-of-free-ranging-eastern-box-turtles-terrapene-carolina-carolina
#19
Cari Rasmussen, Matthew C Allender, Christopher A Phillips, John Byrd, Terrell Lloyd, Carol Maddox
Gram-negative isolates (n = 84) from 71% of free-ranging Eastern box turtles (Terrapene carolina carolina) in Illinois and Tennessee, United States, demonstrated resistance to at least one antibiotic while 30% of isolates demonstrated resistance to two or more antibiotics. Resistance was observed against cefoxitin, amoxicillin-clavulanic acid, cefazolin, ampicillin, ticarcillin, cefovecin, and ceftiofur. Gram-positive bacteria were isolated from 49 turtles, and all were observed to be resistant to two or more antibiotics...
September 2017: Journal of Zoo and Wildlife Medicine: Official Publication of the American Association of Zoo Veterinarians
https://www.readbyqxmd.com/read/28919348/prevalence-of-colistin-resistance-in-clinical-isolates-of-enterobacteriaceae-a-four-year-cross-sectional-study
#20
Núria Prim, Miquel Turbau, Alba Rivera, Judith Rodríguez-Navarro, Pere Coll, Beatriz Mirelis
Objectives The objectives were to determine the prevalence of colistin resistance in clinical isolates of Enterobacteriaceae, and to gain knowledge on the epidemiological and clinical features of the patients. Methods All colistin-resistant Enterobacteriaceae consecutively isolated from clinical samples in our institution from 2012 to 2015, were included in this cross-sectional study. Intrinsic-resistant species with were excluded. Minimum inhibitory concentration was performed by gradient diffusion. Detection of plasmid-encoded colistin resistance genes mcr-1 and mcr-2 was performed by amplification...
September 14, 2017: Journal of Infection
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