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https://www.readbyqxmd.com/read/28924191/metabolic-crosstalk-regulates-porphyromonas-gingivalis-colonization-and-virulence-during-oral-polymicrobial-infection
#1
Masae Kuboniwa, John R Houser, Erik L Hendrickson, Qian Wang, Samar A Alghamdi, Akito Sakanaka, Daniel P Miller, Justin A Hutcherson, Tiansong Wang, David A C Beck, Marvin Whiteley, Atsuo Amano, Huizhi Wang, Edward M Marcotte, Murray Hackett, Richard J Lamont
Many human infections are polymicrobial in origin, and interactions among community inhabitants shape colonization patterns and pathogenic potential (1) . Periodontitis, which is the sixth most prevalent infectious disease worldwide (2) , ensues from the action of dysbiotic polymicrobial communities (3) . The keystone pathogen Porphyromonas gingivalis and the accessory pathogen Streptococcus gordonii interact to form communities in vitro and exhibit increased fitness in vivo (3,4) . The mechanistic basis of this polymicrobial synergy, however, has not been fully elucidated...
September 18, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28886459/inner-filter-with-carbon-quantum-dots-a-selective-sensing-platform-for-detection-of-hematin-in-human-red-cells
#2
Qian Qian Zhang, Bin Bin Chen, Hong Yan Zou, Yuan Fang Li, Cheng Zhi Huang
Hematin plays a crucial role in various physiological functions, and the determination of hematin in complex biological matrixes is a significant but difficult issue. Considering the unique photophysical/photochemical properties of carbon quantum dots (CQDs) prepared with p-aminobenzoic acid (PABA) and ethanol, a new strategy for the design of fluorescent probes for hematin has been achieved. The proposed sensor array is fabricated based on the inner filter effect (IFE) between hematin and CQDs with phenomenon of selective fluorescence quenching of CQDs which results from the strong absorption of the excitation and emission spectrum of CQDs by hematin...
August 24, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28879804/evaluation-of-the-endocrine-disrupting-effects-of-homosalate-hms-and-2-ethylhexyl-4-dimethylaminobenzoate-od-paba-in-rat-pups-during-the-prenatal-lactation-and-early-postnatal-periods
#3
Meltem Erol, Ismet Çok, Özlem Bostan Gayret, Pembegül Günes, Özgül Yigit, Elif Sayman, Aysegül Günes, Duygu Sultan Çelik, Sahin Hamilçikan, Serdar Altinay, Oya Ercan
Homosalate (HMS) and 2-ethylhexyl 4-dimethylaminobenzoate (OD-PABA) are ultraviolet filters. We aimed to investigate the effects of dermal exposure to HMS and OD-PABA during the prenatal, lactation, and early infancy periods on pubertal development and thyroid function in male and female rats. The thyroid glands, uteri, testes, prostate glands, and seminal vesicles were excised and weighed, the reproductive organs were analyzed histologically, and the serum hormone levels were measured. In the prenatal period, the thyroxine (T4) levels increased in the female rats in the exposed groups ( p < 0...
January 1, 2017: Toxicology and Industrial Health
https://www.readbyqxmd.com/read/28874401/chemical-uv-filters-can-affect-human-sperm-function-in-a-progesterone-like-manner
#4
Anders Rehfeld, Dorte Egeberg, Kristian Almstrup, Jørgen Holm Petersen, Steen Dissing, Niels Erik Skakkebæk
Human sperm cell function must be precisely regulated to achieve natural fertilization. Progesterone released by the cumulus cells surrounding the egg induces a Ca2+-influx into human sperm cells via the CatSper Ca2+-channel and thereby controls sperm function. Multiple chemical UV filters have been shown to induce a Ca2+-influx through CatSper, thus mimicking the effect of progesterone on Ca2+-signaling. We hypothesized that these UV filters could also mimic the effect of progesterone on sperm function. We examined 29 UV filters allowed in sunscreens in the US and/or EU for their ability to affect acrosome reaction, penetration, hyperactivation, and viability in human sperm cells...
September 5, 2017: Endocrine Connections
https://www.readbyqxmd.com/read/28867759/development-and-optimization-of-orally-and-topically-applied-liquid-crystal-drug-formulations
#5
Wesam R Kadhum, Tomoki Hada, Ichiro Hijikuro, Hiroaki Todo, Kenji Sugibayashi
Liquid crystal (LC)-forming lipids represent an important class of biocompatible amphiphiles and their application extends to cosmeceutical, dietary, and pharmaceutical technologies. In the present study, we aimed to develop strategies for designing and optimizing oral and topical LC formulations by evaluating their in vitro and in vivo drug absorption performances. C17-Monoglycerol ester (MGE) was used as a LC-forming lipid. p-Amino benzoic acid, methyl PABA, ethyl PABA, and sodium fluorescein were selected as drug models with different physiochemical properties...
2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/28860887/new-developments-in-the-management-of-relapsed-refractory-multiple-myeloma-the-role-of-ixazomib
#6
REVIEW
Paul G Richardson, Shaji Kumar, Jacob P Laubach, Claudia Paba-Prada, Neeraj Gupta, Deborah Berg, Helgi van de Velde, Philippe Moreau
Ixazomib is the first oral proteasome inhibitor to be approved, in combination with lenalidomide and dexamethasone, for the treatment of patients with multiple myeloma who have received at least one prior therapy. Approval was on the basis of results from the phase 3, double-blind, placebo-controlled TOURMALINE-MM1 study, which demonstrated a 35% improvement in progression-free survival with the all-oral combination of ixazomib plus lenalidomide-dexamethasone versus lenalidomide-dexamethasone alone (median: 20...
2017: Journal of Blood Medicine
https://www.readbyqxmd.com/read/28856664/iga-multiple-myeloma-in-a-patient-with-an-igg-pemphigus-foliaceus-like-exanthem
#7
Nayoung Lee, Stephen J Lockwood, Paul Richardson, Claudia Paba-Prada, Arturo P Saavedra
No abstract text is available yet for this article.
August 30, 2017: International Journal of Dermatology
https://www.readbyqxmd.com/read/28808156/the-identification-of-staphylococcus-aureus-factors-required-for-pathogenicity-and-growth-in-human-blood
#8
John Connolly, Emma Boldock, Lynne R Prince, Stephen A Renshaw, Moira K Whyte, Simon J Foster
Staphylococcus aureus is a human commensal but also has devastating potential as an opportunist pathogen. S. aureus bacteraemia is often associated with an adverse outcome. To identify potential targets for novel control approaches we have identified S. aureus components that are required for growth on human blood. An ordered transposon mutant library was screened, identifying 9 genes involved specifically in haemolysis or growth on human blood agar compared to the parental strain. Three genes (purA, purB and pabA) were subsequently found to be required for pathogenesis in the zebrafish embryo infection model...
August 14, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28805228/highly-dispersed-tio2-nanoparticles-with-abundant-active-sites-induced-by-surfactants-as-a-prominent-substrate-for-sers-charge-transfer-contribution
#9
Libin Yang, Di Yin, Yu Shen, Ming Yang, Xiuling Li, Xiaoxia Han, Xin Jiang, Bing Zhao
In this study, highly-dispersed TiO2 nanoparticles (NPs) with abundant active sites were synthesized by a simple sol-hydrothermal method with the assistance of surfactant polyethylene glycol (PEG) which served as an effective SERS-active substrate for the first time. The observed considerable SERS enhancement of 4-mercaptobenzoic acid (4-MBA) probe molecules on TiO2 NPs is attributed to the contribution of the charge transfer mechanism from the substrate to the probe molecule. It is suggested that PEG can act as a protective agent in the reductive calcination of the surfactant-coated nanocrystallite and consequently brings about abundant surface oxygen vacancies for TiO2 NPs, which provide more effective sites for the adsorption of probe molecules and promote the charge transfer effect and its consequent SERS enhancement...
August 23, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28747479/a-nutrient-mediates-intraspecific-competition-between-rodent-malaria-parasites-in-vivo
#10
Nina Wale, Derek G Sim, Andrew F Read
Hosts are often infected with multiple strains of a single parasite species. Within-host competition between parasite strains can be intense and has implications for the evolution of traits that impact patient health, such as drug resistance and virulence. Yet the mechanistic basis of within-host competition is poorly understood. Here, we demonstrate that a parasite nutrient, para-aminobenzoic acid (pABA), mediates competition between a drug resistant and drug susceptible strain of the malaria parasite, Plasmodium chabaudi We further show that increasing pABA supply to hosts infected with the resistant strain worsens disease and changes the relationship between parasite burden and pathology...
July 26, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28736527/human-coq9-rescues-a-coq9-yeast-mutant-by-enhancing-coenzyme-q-biosynthesis-from-4-hydroxybenzoic-acid-and-stabilizing-the-coq-synthome
#11
Cuiwen H He, Dylan S Black, Christopher M Allan, Brigitte Meunier, Shamima Rahman, Catherine F Clarke
Coq9 is required for the stability of a mitochondrial multi-subunit complex, termed the CoQ-synthome, and the deamination step of Q intermediates that derive from para-aminobenzoic acid (pABA) in yeast. In human, mutations in the COQ9 gene cause neonatal-onset primary Q10 deficiency. In this study, we determined whether expression of human COQ9 could complement yeast coq9 point or null mutants. We found that expression of human COQ9 rescues the growth of the temperature-sensitive yeast mutant, coq9-ts19, on a non-fermentable carbon source and increases the content of Q6, by enhancing Q biosynthesis from 4-hydroxybenzoic acid (4HB)...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28719296/analysis-of-dengue-serotype-4-in-sri-lanka-during-the-2012-2013-dengue-epidemic
#12
Anna Uehara, Hasitha Aravinda Tissera, Champica K Bodinayake, Ananda Amarasinghe, Ajith Nagahawatte, L Gayani Tillekeratne, Jie Cui, Megan E Reller, Paba Palihawadana, Sunethra Gunasena, Aruna Dharshan Desilva, Annelies Wilder-Smith, Duane J Gubler, Christopher W Woods, October M Sessions
The four serotypes of dengue virus (DENV-1, -2, -3, and -4) have had a rapidly expanding geographic range and are now endemic in over 100 tropical and subtropical countries. Sri Lanka has experienced periodic dengue outbreaks since the 1960s, but since 1989 epidemics have become progressively larger and associated with more severe disease. The dominant virus in the 2012 epidemic was DENV-1, but DENV-4 infections were also commonly observed. DENV-4 transmission was first documented in Sri Lanka when it was isolated from a traveler in 1978, but has been comparatively uncommon since dengue surveillance began in the early 1980s...
July 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28717039/deletion-of-sigb-causes-increased-sensitivity-to-para-aminosalicylic-acid-and-sulfamethoxazole-in-mycobacterium-tuberculosis
#13
Shan-Shan Yang, Yang-Bo Hu, Xu-De Wang, Yun-Rong Gao, Kun Li, Xian-En Zhang, Shi-Yun Chen, Tian-Yu Zhang, Jing Gu, Jiao-Yu Deng
Although the de novo folate biosynthesis pathway has been well studied in bacteria, little is known about its regulation. In this study, the sigB gene in Mycobacterium tuberculosis (M. tb) was deleted. Subsequent drug susceptibility tests revealed that M. tb ΔsigB was more sensitive to para-aminosalicylic acid (PAS) and sulfamethoxazole (SMX). Comparative transcriptional analysis was performed and down-regulation of pabB was observed in the sigB deleted strain, which was further verified by qRT-PCR and Western blot assay...
July 17, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28707064/development-of-a-lateral-flow-dipstick-immunoassay-for-evaluation-of-folate-levels-in-maize
#14
Qiuju Liang, Chen Yi, Ling Jiang, Guiyu Tan, Chunyi Zhang, Baomin Wang
Folates (vitamin B9) are essential for all organisms as cofactors for one-carbon metabolism. However, measurement of folates is technically complicated and time-consuming. In this study, we developed a dipstick immunoassay using a folate-specific monoclonal antibody (mAb), allowing rapid and low-cost detection of folates. The indicator range of the dipstick for 5-formylterahydrofolate (5-CHO-THF), 5-methyltetrahydrofolate (5-CH3-THF) and their polyglutamyl forms was 100-200 ng mL(-1); moreover, no cross-reactivity was observed with tetrahydrofolate (THF) or 5,10-methenyltetrahydrofolate (5,10-CH=THF) at 500 ng mL(-1), or with the folate precursors pterin-6-COOH, p-aminobenzoate (pABA), and L-glutamate, or with the folate analogues methotrexate and 10-formyltetrahydrofolate (10-CHO-THF) at up to 1000 ng mL(-1)...
July 13, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28699744/design-synthesis-and-pharmacokinetics-of-a-bone-targeting-dual-action-prodrug-for-the-treatment-of-osteoporosis
#15
Haibo Xie, Gang Chen, Robert N Young
A dual-action bone-targeting prodrug has been designed, synthesized, and evaluated for in vitro and in vivo metabolic stability, in vivo tissue distribution, and rates of release of the active constituents after binding to bones through the use of differentially double-labeled derivatives. The conjugate (general structure 7) embodies the merger of a very potent and proven anabolic selective agonist of the prostaglandin EP4 receptor, compound 5, and alendronic acid, a potent inhibitor of bone resorption, optimally linked through a differentially hydrolyzable linker unit, N-4-carboxymethylphenyl-methyloxycarbonyl-leucinyl-argininyl-para-aminophenylmethylalcohol (Leu-Arg-PABA)...
August 10, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28693434/symptom-burden-in-chronic-kidney-disease-a-population-based-cross-sectional-study
#16
Sameera Senanayake, Nalika Gunawardena, Paba Palihawadana, Palitha Bandara, Rashan Haniffa, R Karunarathna, Priyantha Kumara
BACKGROUND: Physical and psychological symptoms are among main manifestations of Chronic Kidney Disease (CKD). This study aimed to assess the symptom burden and self-perceived severity of symptoms among CKD patients living in a district in Sri Lanka. METHOD: A community based cross-sectional study included a sample of randomly selected 1174 CKD patients from all 19 Medical Officer of Health areas in the district of Anuradhapura. Trained para-medical staff visited the households and administered the locally validated questionnaire to assess the presence and severity of symptoms...
July 10, 2017: BMC Nephrology
https://www.readbyqxmd.com/read/28653778/activatable-near-infrared-probe-for-fluorescence-imaging-of-%C3%AE-glutamyl-transpeptidase-in-tumor-cells-and-in-vivo
#17
Zhiliang Luo, Liandong Feng, Ruibing An, Guanfu Duan, Runqi Yan, Hua Shi, Jian He, Zhengyang Zhou, Changge Ji, Hong-Yuan Chen, Deju Ye
γ-Glutamyl transpeptidase (GGT) is a cell-membrane-bound enzyme that is involved in various physiological and pathological processes and is regarded as a potential biomarker for many malignant tumors, precise detection of which is useful for early cancer diagnosis. Herein, a new GGT-activatable near-infrared (NIR) fluorescence imaging probe (GANP) by linking of a GGT-recognitive substrate γ-glutamate (γ-Glu) and a NIR merocyanine fluorophore (mCy-Cl) with a self-immolative linker p-aminobenzyl alcohol (PABA) is reported...
June 27, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28650510/experiment-and-theory-confirm-that-uv-laser-photodissociation-spectroscopy-can-distinguish-protomers-formed-via-electrospray
#18
Edward Matthews, Caroline E H Dessent
The identification of protonation sites in electrosprayed molecules remains a challenge in contemporary physical science. We present the first demonstration that low-resolution, UV laser photodissociation spectroscopy can be applied in situ to identify the protomers of para-aminobenzoic acid (PABA) formed via electrospray from a single solution. Electronic absorption spectra are recorded via photodepletion and photofragmentation for PABA electrosprayed from solutions of water and acetonitrile. Using this approach, two protomers can be straightforwardly identified, with only the carboxylic acid protomer being produced on electrospray from water while the amine-protonated isomer dominates upon electrospray from acetonitrile...
June 26, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28639657/exploring-the-catalytic-mechanism-of-dihydropteroate-synthase-elucidating-the-differences-between-the-substrate-and-inhibitor
#19
Warot Chotpatiwetchkul, Kanokthip Boonyarattanakalin, Duangkamol Gleeson, M Paul Gleeson
Dihydropteroate synthase (DHPS) catalyzes the condensation of 6-hydroxymethyl-7,8-dihydropterin pyrophosphate (DHPPP) with p-aminobenzoic acid (pABA) and is a well validated target for anti-malarial and anti-bacterial drugs. However, in recent years its utility as a therapeutic target has diminished considerably due to multiple mutations. As such, considerable structural biology and medicinal chemistry effort has been expended to understand and overcome this issue. To date no detailed computational analysis of the protein mechanism has been made despite the detailed crystal structures and multiple mechanistic proposals being made...
July 5, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28628859/structural-and-functional-effects-of-nucleotide-variation-on-the-human-tb-drug-metabolizing-enzyme-arylamine-n-acetyltransferase-1
#20
Ruben Cloete, Wisdom A Akurugu, Cedric J Werely, Paul D van Helden, Alan Christoffels
The human arylamine N-acetyltransferase 1 (NAT1) enzyme plays a vital role in determining the duration of action of amine-containing drugs such as para-aminobenzoic acid (PABA) by influencing the balance between detoxification and metabolic activation of these drugs. Recently, four novel single nucleotide polymorphisms (SNPs) were identified within a South African mixed ancestry population. Modeling the effects of these SNPs within the structural protein was done to assess possible structure and function changes in the enzyme...
June 10, 2017: Journal of Molecular Graphics & Modelling
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