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https://www.readbyqxmd.com/read/29101780/thyroid-disrupting-effects-of-halogenated-and-next-generation-chemicals-on-the-swim-bladder-development-of-zebrafish
#1
Amy Godfrey, Blair Hooser, Ahmed Abdelmoneim, Katharine A Horzmann, Jennifer L Freemanc, Maria S Sepúlveda
Endocrine disrupting chemicals (EDCs) can alter thyroid function and adversely affect growth and development. Halogenated compounds, such as perfluorinated chemicals commonly used in food packaging, and brominated flame retardants used in a broad range of products from clothing to electronics, can act as thyroid disruptors. Due to the adverse effects of these compounds, there is a need for the development of safer next generation chemicals. The objective of this study was to test the thyroid disruption potential of old use and next generation halogenated chemicals...
October 28, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/29083321/emc3-coordinates-surfactant-protein-and-lipid-homeostasis-required-for-respiration
#2
Xiaofang Tang, John M Snowball, Yan Xu, Cheng-Lun Na, Timothy E Weaver, Geremy Clair, Jennifer E Kyle, Erika M Zink, Charles Ansong, Wei Wei, Meina Huang, Xinhua Lin, Jeffrey A Whitsett
Adaptation to respiration at birth depends upon the synthesis of pulmonary surfactant, a lipid-protein complex that reduces surface tension at the air-liquid interface in the alveoli and prevents lung collapse during the ventilatory cycle. Herein, we demonstrated that the gene encoding a subunit of the endoplasmic reticulum membrane complex, EMC3, also known as TMEM111 (Emc3/Tmem111), was required for murine pulmonary surfactant synthesis and lung function at birth. Conditional deletion of Emc3 in murine embryonic lung epithelial cells disrupted the synthesis and packaging of surfactant lipids and proteins, impaired the formation of lamellar bodies, and induced the unfolded protein response in alveolar type 2 (AT2) cells...
October 30, 2017: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/29053208/intermolecular-pummerer-coupling-with-carbon-nucleophiles-in-non-electrophilic-media
#3
Kilian Colas, Raúl Martín-Montero, Abraham Mendoza
A new Pummerer-type C-C coupling protocol is introduced based on turbo-organomagnesium amides, which unlike traditional Pummerer reactions, does not require strong electrophilic activators, engages a broad range of C(sp(3) )-, C(sp(2) )-, and C(sp)-nucleophiles, and seamlessly integrates with C-H and C-X magnesiation. Given the central character of sulfur compounds in organic chemistry, this protocol allows access to unrelated carbonyls, olefins, organometallics, halides, and boronic esters through a single strategy...
October 20, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28978789/unexpected-beauty-and-diversity-in-the-structures-of-three-homologous-4-5-dialkoxy-1-ethynyl-2-nitrobenzenes-the-subtle-interplay-between-intermolecular-c-h-o-hydrogen-bonds-and-alkyl-chain-length
#4
Shalisa M Oburn, Eric Bosch
The synthesis, (1)H and (13)C NMR spectra, and X-ray structures are described for three dialkoxy ethynylnitrobenzenes that differ only in the length of the alkoxy chain, namely 1-ethynyl-2-nitro-4,5-dipropoxybenzene, C14H17NO4, 1,2-dibutoxy-4-ethynyl-5-nitrobenzene, C16H21NO4, and 1-ethynyl-2-nitro-4,5-dipentoxybenzene, C18H25NO4. Despite the subtle changes in molecular structure, the crystal structures of the three compounds display great diversity. Thus, 1-ethynyl-2-nitro-4,5-dipropoxybenzene crystallizes in the trigonal crystal system in the space group R-3, with Z = 18, 1,2-dibutoxy-4-ethynyl-5-nitrobenzene crystallizes in the monoclinic crystal system in the space group P21/c, with Z = 4, and 1-ethynyl-2-nitro-4,5-dipentoxybenzene crystallizes in the triclinic crystal system in the space group P-1, with Z = 2...
October 1, 2017: Acta Crystallographica. Section C, Structural Chemistry
https://www.readbyqxmd.com/read/28954633/clusterin-modulates-transdifferentiation-of-non-small-cell-lung-cancer
#5
Runsen Jin, Xingshi Chen, Dingpei Han, Xiaoying Luo, Hecheng Li
BACKGROUND: Secreted clusterin (sCLU), a 75-80 kDa disulfide-linked heterodimeric protein, plays crucial roles in various pathophysiological processes, including lipid transport, tissue remodeling, cell apoptosis and reproduction. Our previous studies demonstrated that sCLU could influence cell apoptosis, proliferation, and invasion of non-small cell lung cancer (NSCLC) cells. METHODS: In this study, clusterin's function in regulating transdifferentiation of NSCLC cells was investigated...
September 27, 2017: BMC Cancer
https://www.readbyqxmd.com/read/28937231/pulmonary-surfactant-and-bacterial-lipopolysaccharide-the-interaction-and-its-functional-consequences
#6
M Kolomaznik, Z Nova, A Calkovska
The respiratory system is constantly exposed to pathogens which enter the lungs by inhalation or via blood stream. Lipopolysaccharide (LPS), also named endotoxin, can reach the airspaces as the major component of the outer membrane of Gram-negative bacteria, and lead to local inflammation and systemic toxicity. LPS affects alveolar type II (ATII) cells and pulmonary surfactant and although surfactant molecule has the effective protective mechanisms, excessive amount of LPS interacts with surfactant film and leads to its inactivation...
September 22, 2017: Physiological Research
https://www.readbyqxmd.com/read/28930236/antibacterial-and-antifungal-activity-of-essential-oils-against-pathogens-responsible-for-otitis-externa-in-dogs-and-cats
#7
Valentina V Ebani, Simona Nardoni, Fabrizio Bertelloni, Basma Najar, Luisa Pistelli, Francesca Mancianti
Background: Essential oils (EOs) are recommended by some veterinarians to treat otitis externa in pets, but data about their efficacy in scientific literature are very scant. Methods: Nine commercial EOs, from roman chamomile (Anthemis nobilis L.), star anise (Illicium verum), lavender (Lavandula hybrida), litsea (Litsea cubeba (Lour.) Pers.), basil (Ocimum basilicum L.), oregano (Origanum vulgare L. subsp. hirticum), rosemary (Rosmarinus officinalis L.), clary sage (Salvia sclarea L.), and thyme (Thymus vulgaris L...
April 21, 2017: Medicines (Basel, Switzerland)
https://www.readbyqxmd.com/read/28834721/divide-conquer-surfactant-protein-sp-c-and-cholesterol-modulate-phase-segregation-in-lung-surfactant
#8
Nuria Roldan, Jesús Pérez-Gil, Michael R Morrow, Begoña García-Álvarez
Lung surfactant (LS) is an essential system supporting the respiratory function. Cholesterol can be deleterious for LS function, a condition that is reversed by the presence of the lipopeptide SP-C. In this work, the structure of LS-mimicking membranes has been analyzed under the combined effect of SP-C and cholesterol by deuterium NMR and phosphorus NMR and by electron spin resonance. Our results show that SP-C induces phase segregation at 37°C, resulting in an ordered phase with spectral features resembling an interdigitated state enriched in dipalmitoylphosphatidylcholine, a liquid-crystalline bilayer phase, and an extremely mobile phase consistent with small vesicles or micelles...
August 22, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28749493/sulfur-directed-carbon-sulfur-bond-cleavage-for-rh-catalyzed-regioselective-alkynylthiolation-of-alkynes
#9
Takanori Shibata, Akihito Mitake, Yosuke Akiyama, Kyalo Stephen Kanyiva
Sulfur-directed sp C-S bond cleavage along with a regioselective reaction with alkynes proceeded to give (Z)-enyne sulfides in high to excellent yields. Mechanistic studies were conducted, including characterization of an intermediate. An intramolecular variant realized the construction of a dibenzodithiepin skeleton, which is a seven-membered ring with two sulfur atoms.
August 8, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28746823/irx1-regulates-dental-outer-enamel-epithelial-and-lung-alveolar-type-ii-epithelial-differentiation
#10
Wenjie Yu, Xiao Li, Steven Eliason, Miguel Romero-Bustillos, Ryan J Ries, Huojun Cao, Brad A Amendt
The Iroquois genes (Irx) appear to regulate fundamental processes that lead to cell proliferation, differentiation, and maturation during development. In this report, the Iroquois homeobox 1 (Irx1) transcription factor was functionally disrupted using a LacZ insert and LacZ expression demonstrated stage-specific expression during embryogenesis. Irx1 is highly expressed in the brain, lung, digits, kidney, testis and developing teeth. Irx1 null mice are neonatal lethal and this lethality it due to pulmonary immaturity...
September 1, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28733146/resveratrol-efficiently-improves-pulmonary-function-via-stabilizing-mast-cells-in-a-rat-intestinal-injury-model
#11
Xiaolei Huang, Weicheng Zhao, Dan Hu, Xue Han, Hanbin Wang, Jianyu Yang, Yang Xu, Yuantao Li, Weifeng Yao, Chaojin Chen
BACKGROUND: Intestinal ischemia/reperfusion (IIR) leads to acute lung injury (ALI) distally by aggravating pulmonary oxidative stress. Resveratrol is effective in attenuating ALI through its antioxidant capacity. This study aimed to determine the effects of resveratrol on IIR-induced ALI and to explore the role of mast cells (MCs) activation in a rat model of IIR. METHODS: Adult Sprague-Dawley rats were subjected to IIR by occluding the superior mesenteric artery for 60min followed by 4-hour reperfusion...
September 15, 2017: Life Sciences
https://www.readbyqxmd.com/read/28725012/phycocyanin-attenuates-pulmonary-fibrosis-via-the-tlr2-myd88-nf-%C3%AE%C2%BAb-signaling-pathway
#12
Chengcheng Li, Yan Yu, Wenjun Li, Bo Liu, Xudong Jiao, Xinyu Song, Changjun Lv, Song Qin
Our aim was to investigate the effects of phycocyanin (PC) on bleomycin (BLM)-induced pulmonary fibrosis (PF). In this study, C57 BL/6 wild-type (WT) mice and toll-like receptor (TLR) 2 deficient mice were treated with PC for 28 days following BLM exposure. Serum and lung tissues were collected on days 3, 7 and 28. Data shows PC significantly decreased the levels of hydroxyproline (HYP), vimentin, surfactant-associated protein C (SP-C), fibroblast specific protein-1 (S100A4) and α-smooth muscle actin (α-SMA) but dramatically increased E-cadherin and podoplanin (PDPN) expression on day 28...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28704044/new-scandium-borylimido-chemistry-synthesis-bonding-and-reactivity
#13
Benjamin A Clough, Simona Mellino, Eric Clot, Philip Mountford
We report a combined synthetic, mechanistic, and theoretical study of the first borylimido complex of a rare earth metal, (NacNac(NMe2))Sc{NB(NAr'CH)2} (25, Ar' = 2,6-C6H3(i)Pr2, NacNac(NMe2) = Ar'NC(Me)CHC(Me)NCH2CH2NMe2). Thermolysis of the methyl-borylamide (NacNac(NMe2))Sc(Me){NHB(NAr'CH)2} (18) generated transient imide 25 via rate-determining, first-order methane elimination (KIE ≈ 8.7). In the absence of external substrate, 25 underwent a reversible cyclometalation reaction (sp(3) C-H bond addition to Sc═Nimide) with a methyl group of the NacNac(NMe2) ligand forming {MeC(NC6H3(i)PrCH(Me)CH2)CHC(Me)NCH2CH2NMe2}Sc{NHB(NAr'CH)2} (21)...
August 16, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28661583/mno2-promoted-oxidative-radical-sulfonylation-of-haloalkynes-with-sulfonyl-hydrazides-c-sp-s-bond-formation-towards-alkynyl-sulfones
#14
Pengquan Chen, Chuanle Zhu, Rui Zhu, Wanqing Wu, Huanfeng Jiang
A catalyst-free oxidative radical sulfonylation of haloalkynes with sulfonyl hydrazides is reported. It represents an example of C(sp)-S bond formation using sulfonyl hydrazides as sulfonyl radical sources. Various alkynyl sulfones were synthesized in moderate to good yields. Having MnO2 as the oxidant is very critical for this transformation. Remarkably, the self-coupling reaction of haloalkynes through C(sp)-C(sp) bond formation is significantly inhibited under the standard reaction conditions.
June 29, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28657099/exploiting-the-dual-role-of-ethynylbenziodoxolones-in-gold-catalyzed-c-sp-c-sp-cross-coupling-reactions
#15
Somsuvra Banerjee, Nitin T Patil
Reported herein is the gold-catalyzed alkynylation of terminal alkynes using ethynylbenziodoxolones (EBXs), where EBXs serve a dual role as oxidants as well as alkyne transfer agents to access unsymmetrical 1,3-diynes. Hence, the catalytic system requires no external oxidants and is compatible with a broad range of substrates, including those with polar functional groups such as NH, OH and B(OH)2.
June 28, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28615099/-hyperoxia-modulates-the-expressions-of-c-ebp%C3%AE-and-pulmonary-surfactant-proteins-in-aecii-of-premature-rats
#16
Yanmin Lu, Hongyan Lu, Jiangyan Liu, Ming Chang, Qiuxia Wang, Wei Tang
Objective To explore the effect of hyperoxia on the expressions of CCAAT enhancer binding protein α (C/EBPα) and pulmonary surfactant proteins (SP-A, SP-B, SP-C, SP-D) and their correlations in primary type II alveolar epithelial cells (AECIIs) from premature rats. Methods AECIIs were divided into an air control group and a hyperoxia model group. The cells of the two groups were respectively exposed toair and 950 mL/L O2. The cells were harvested at 24, 48, and 72 hours after exposure. Inverted phase-contrast microscope was used to observe morphological changes of the cells...
June 2017: Xi Bao Yu Fen Zi Mian Yi Xue za Zhi, Chinese Journal of Cellular and Molecular Immunology
https://www.readbyqxmd.com/read/28610019/four-new-species-of-i-callibaetis-i-eaton-ephemeroptera-baetidae-nymphal-description-of-i-callibaetis-i-i-abaetetuba-i-fasciatus-pictet-and-keys-for-south-american-species-of-i-callibaetis-i
#17
Paulo Vilela Cruz, Frederico Falcão Salles, Neusa Hamada
The first phylogenetic study of Callibaetis Eaton indicated an unrevealed diversity in this genus, including four new species named as Callibaetis sp. A, B, C and D, and the undescribed nymph of Callibaetis (Abaetetuba) fasciatus (Pictet). Given that neither the nymph of C. (Ab.) fasciatus nor the four new species received a proper description, the objective of this study is to describe them. The nymph of C. (Ab.) fasciatus differs from the others species in the subgenus by the presence of one row of setae on basal part of inner-dorsal row of maxilla and metanotum without spines; Callibaetis sp...
April 5, 2017: Zootaxa
https://www.readbyqxmd.com/read/28587394/mir-206-inhibits-fn1-expression-and-proliferation-and-promotes-apoptosis-of-rat-type-ii-alveolar-epithelial-cells
#18
Jun Duan, Xiaoying Zhang, Sheng Zhang, Shaodong Hua, Zhichun Feng
Bronchopulmonary dysplasia (BPD) is a syndrome of respiratory distress caused by chronic lung injury, primarily in preterm infants. miR-206 and fibronectin 1 (FN1) are associated with the development of BPD. The present study used rat type II alveolar epithelial cells (AECII) to investigate the underlying mechanisms of BPD. AECII were isolated using a primary cell culture prior to alkaline phosphatase staining and immunofluorescence of surfactant protein C (SP-C). These were used to verify the presence of AECII...
June 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28552795/rhukgf-ameliorates-protease-anti-protease-imbalance-in-emphysematous-mice
#19
Sudhir Kotnala, Amit Tyagi, Jai Prakash Muyal
We attempted to elucidate the beneficial role of rHuKGF supplementation in the amelioration of protease/antiprotease imbalance and TGF-β1 signaling pathway leading to alveolar tissue maintenance in elastase induced emphysematous mice. Thirty two male C57BL mice were divided into four groups i.e. control, emphysema, therapy and rHuKGF only and were oropharyngeally instilled with saline/porcine pancreatic elastase/rHuKGF. Subsequently, lungs from mice were collected for histopathology and molecular biology studies...
August 2017: Pulmonary Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/28544742/gold-catalyzed-cadiot-chodkiewicz-type-cross-coupling-of-terminal-alkynes-with-alkynyl-hypervalent-iodine-reagents-highly-selective-synthesis-of-unsymmetrical-1-3-diynes
#20
Xiangdong Li, Xin Xie, Ning Sun, Yuanhong Liu
A new and efficient method for the synthesis of unsymmetrical 1,3-butadiynes by gold-catalyzed C(sp)-C(sp) cross-coupling of terminal alkynes with alkynyl hypervalent iodine(III) reagents has been developed. The reaction features high selectivity and efficiency, mild reaction conditions, wide substrate scope, and functional-group compatibility, and is a highly attractive complement to existing methods. Mechanistic studies reveal that formation of a phenanthrolinyl-ligated gold(I) complex is crucial for the efficiency and selectivity of the target transformation...
May 22, 2017: Angewandte Chemie
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