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https://www.readbyqxmd.com/read/28640808/transmembrane-helical-interactions-in-the-cftr-channel-pore
#1
Jhuma Das, Andrei A Aleksandrov, Liying Cui, Lihua He, John R Riordan, Nikolay V Dokholyan
Mutations in the Cystic Fibrosis Transmembrane Conductance Regulator (CFTR) gene affect CFTR protein biogenesis or its function as a chloride channel, resulting in dysregulation of epithelial fluid transport in the lung, pancreas and other organs in cystic fibrosis (CF). Development of pharmaceutical strategies to treat CF requires understanding of the mechanisms underlying channel function. However, incomplete 3D structural information on the unique ABC ion channel, CFTR, hinders elucidation of its functional mechanism and correction of cystic fibrosis causing mutants...
June 22, 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28640691/the-nesprin-cytoskeleton-interface-probed-directly-on-single-nuclei-is-a-mechanically-rich-system
#2
Daniel A Balikov, Sonia K Brady, Ung Hyun Ko, Jennifer H Shin, Jose M de Pereda, Arnoud Sonnenberg, Hak-Joon Sung, Matthew J Lang
The cytoskeleton provides structure and plays an important role in cellular function such as migration, resisting compression forces, and transport. The cytoskeleton also reacts to physical cues such as fluid shear stress or extracellular matrix remodeling by reorganizing filament associations, most commonly focal adhesions and cell-cell cadherin junctions. These mechanical stimuli can result in genome-level changes, and the physical connection of the cytoskeleton to the nucleus provides an optimal conduit for signal transduction by interfacing with nuclear envelope proteins, called nesprins, within the LINC (linker of the nucleus to the cytoskeleton) complex...
June 22, 2017: Nucleus
https://www.readbyqxmd.com/read/28636424/fluid-shear-stress-regulates-hepg2-cell-migration-though-time-dependent-integrin-signaling-cascade
#3
Hongchi Yu, Yang Shen, Jingsi Jin, Yingying Zhang, Tang Feng, Xiaoheng Liu
Hepatocellular carcinoma (HCC) is a subtype of malignant liver cancer with poor prognosis and limited treatment options. It is noteworthy that mechanical forces in tumor microenvironment play a pivotal role in mediating the behaviors and functions of tumor cells. As an instrumental type of mechanical forces in vivo, fluid shear stress (FSS) has been reported having potent physiologic and pathologic effects on cancer progression. However, the time-dependent mechanochemical transduction in HCC induced by FSS remains unclear...
June 21, 2017: Cell Adhesion & Migration
https://www.readbyqxmd.com/read/28635218/-nasal-irrigation-for-the-treatment-of-vasomotor-rhinitis-a-pilot-study
#4
L Lin, Q Lu, X Y Tang, F Dai, J J Wei
Objective: To observe the therapeutic effect of simple 3.0% saline nasal irrigation and combined treatment of 3.0% saline nasal irrigation and budesonide nasal spray for vasomotor rhinitis (VMR), and explore the long-term effect for VMR. Through examination of levels of substance P (SP) and mucin (MUC)5B in nasal lavage fluid, the mechanisms of nasal irrigation treatment for VMR was discussed. Methods: One hundred and one patients from Department of Otorhinolaryngology Head and Neck Surgery, Huashan Hospital of Fudan University with VMR were randomly divided into 4 groups...
June 7, 2017: Zhonghua Er Bi Yan Hou Tou Jing Wai Ke za Zhi, Chinese Journal of Otorhinolaryngology Head and Neck Surgery
https://www.readbyqxmd.com/read/28633090/pulmonary-and-cardiac-pathology-in-sudden-unexpected-death-in-epilepsy-sudep
#5
REVIEW
Fábio A Nascimento, Zian H Tseng, Cristian Palmiere, Joseph J Maleszewski, Takayuki Shiomi, Aileen McCrillis, Orrin Devinsky
OBJECTIVE: To review studies on structural pulmonary and cardiac changes in SUDEP cases as well as studies showing pulmonary or cardiac structural changes in living epilepsy patients. METHODS: We conducted electronic literature searches using the PubMed database for articles published in English, regardless of publication year, that included data on cardiac and/or pulmonary structural abnormalities in SUDEP cases or in living epilepsy patients during the postictal period...
June 17, 2017: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/28631567/microrna-1285-5p-influences-the-proliferation-and-metastasis-of-non-small-cell-lung-carcinoma-cells-via-downregulating-cdh1-and-smad4
#6
Shixia Zhou, Zhongmian Zhang, Pengyuan Zheng, Wenchao Zhao, Na Han
Abnormal expression of microRNAs has been reported to regulate gene expression and cancer cell growth, invasion, and migration. Recently, upregulation of hsa-miR-1285 was demonstrated in bronchoalveolar lavage fluid samples from patients with lung cancer and downregulation in plasma level of stage-I lung cancer patients. However, the function and the underlying mechanism of miR-1285 in non-small-cell lung carcinoma have not been elucidated. In this study, we found that miR-1285-5p, the mature form of miR-1285, was significantly upregulated in human non-small-cell lung carcinoma cell lines A549 and SK-MES-1...
June 2017: Tumour Biology: the Journal of the International Society for Oncodevelopmental Biology and Medicine
https://www.readbyqxmd.com/read/28631442/osteoblast-migration-in-vertebrate-bone
#7
Antonia Thiel, Marie K Reumann, Adele Boskey, Johannes Wischmann, Rüdiger von Eisenhart-Rothe, Philipp Mayer-Kuckuk
Bone formation, for example during bone remodelling or fracture repair, requires mature osteoblasts to deposit bone with remarkable spatial precision. As osteoblast precursors derive either from circulation or resident stem cell pools, they and their progeny are required to migrate within the three-dimensional bone space and to navigate to their destination, i.e. to the site of bone formation. An understanding of this process is emerging based on in vitro and in vivo studies of several vertebrate species. Receptors on the osteoblast surface mediate cell adhesion and polarization, which induces osteoblast migration...
June 19, 2017: Biological Reviews of the Cambridge Philosophical Society
https://www.readbyqxmd.com/read/28631361/optimal-right-heart-filling-pressure-in-acute-respiratory-distress-syndrome-determined-by-strain-echocardiography
#8
Romel Garcia-Montilla, Faryal Imam, Mi Miao, Kathryn Stinson, Akram Khan, Stephen Heitner
INTRODUCTION: Right ventricular (RV) systolic dysfunction is common in acute respiratory distress syndrome (ARDS). While preload optimization is crucial in its management, dynamic fluid responsiveness indices lack reliability, and there is no consensus on target central venous pressure (CVP). We analyzed the utility of RV free wall longitudinal strain (RVFWS) in the estimation of optimal RV filling pressure in ARDS. METHODS: A retrospective cross-sectional analysis of clinical data and echocardiograms of patients with ARDS was performed...
June 2017: Echocardiography
https://www.readbyqxmd.com/read/28630869/increase-of-soluble-rage-in-cerebrospinal-fluid-following-subarachnoid-haemorrhage
#9
Bartosz Sokół, Norbert Wąsik, Roman Jankowski, Marcin Hołysz, Witold Mańko, Robert Juszkat, Tomasz Małkiewicz, Paweł P Jagodziński
Receptors for advanced glycation end-products (RAGE) mediate the inflammatory reaction that follows aneurysmal subarachnoid haemorrhage. Soluble RAGE (sRAGE) may function as a decoy receptor. The significance of this endogenous anti-inflammatory mechanism in subarachnoid haemorrhage (SAH) remains unknown. The present study aims to analyse sRAGE levels in the cerebrospinal fluid (CSF) of SAH patients. sRAGE levels were assayed by ELISA kit in 47 CSF samples collected on post-SAH days 0-3, 5-7, and 10-14 from 27 SAH patients with acute hydrocephalus...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28629357/xuefuzhuyu-decoction-protected-cardiomyocytes-against-hypoxia-reoxygenation-injury-by-inhibiting-autophagy
#10
Xiaowen Shi, Haiyan Zhu, Yuanyuan Zhang, Mingmei Zhou, Danli Tang, Huamin Zhang
BACKGROUND: XuefuZhuyu decoction (XFZY) is a well-known traditional Chinese herbal medicine for the treatment of various cardiovascular diseases, such as unstable angina pectoris and myocardial ischemia-reperfusion injury. However, the mechanism by which XFZY contributes to the amelioration of cardiac injury remains unclear. METHODS: H9C2 cells were cultured under the hypoxic condition for 10 h and reoxygenated for 2 h. In the presence of various concentrations of XFZY for 12 h, the cell viability was measured by MTT assay...
June 19, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28629263/mass-spectrometry-based-analysis-of-murine-bronchoalveolar-lavage-fluid-following-respiratory-exposure-to-4-4-methylene-diphenyl-diisocyanate-aerosol
#11
Justin M Hettick, Brandon F Law, Chen-Chung Lin, Adam V Wisnewski, Paul D Siegel
Diisocyanates are highly reactive electrophiles utilized in the manufacture of a wide range of polyurethane products, and have been identified as causative agents of occupational allergic respiratory disease. However, in spite of the significant occupational health burden associated with diisocyanate-induced asthma, the mechanism of disease pathogenesis remains largely unknown. To better understand the fate of inhaled diisocyanates, a nose-only aerosol exposure system was constructed and utilized to expose a BALB/c mouse model to aerosol generated from 4,4'-methylene diphenyl diisocyanate (MDI)...
June 20, 2017: Xenobiotica; the Fate of Foreign Compounds in Biological Systems
https://www.readbyqxmd.com/read/28629081/optimized-composition-of-nanocomposite-scaffolds-formed-from-silk-fibroin-and-nano-tio2-for-bone-tissue-engineering
#12
N Johari, H R Madaah Hosseini, A Samadikuchaksaraei
Natural silk fibroin (SF) polymer has biomedical and mechanical properties as a biomaterial for bone tissue engineering scaffolds. Freeze-dried porous nanocomposite scaffolds were prepared from silk fibroin and titanium dioxide (TiO2) nanoparticles as a bioactive reinforcing agent by a phase separation method. In order to fabricate SF/TiO2 scaffolds, 5, 10, 15 and 20wt% of the TiO2 were added to the SF. The phase structure, functional groups and morphology of the scaffolds were evaluated using X-ray diffraction, Fourier transform infrared spectroscopy and scanning electron microscopy techniques, respectively...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28629036/intestine-targeted-delivery-potency-of-the-o-carboxymethyl-chitosan-gum-arabic-coacervate-effects-of-coacervation-acidity-and-possible-mechanism
#13
Guo-Qing Huang, Li-Na Liu, Xiao-Na Han, Jun-Xia Xiao
The potential of the glutaraldehyde-crosslinked O-carboxymethyl chitosan (O-CMC)-gum Arabic (GA) coacervate as an intestine-targeted delivery system for hydrophobic compounds was concerned. OCMC-GA coacervates and emulsified bovine serum albumin (BSA)-loaded microcapsules were prepared in pH3.0, 4.5, and 6.0 and their swelling behaviors as well as BSA release profiles in simulated gastrointestinal fluids were measured. All the coacervates showed higher swelling ratios in the simulated gastric solution than in the simulated intestine and colon solutions and the values increased as the coacervation pH increased from 3...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28628995/in-simulated-body-fluid-performance-of-polymorphic-apatite-coatings-synthesized-by-pulsed-electrodeposition
#14
Shoujie Liu, Hejun Li, Leilei Zhang, Xuemin Yin, Yao Guo
Surface modification is to modify biological responses through changing surface properties without reducing the mechanical properties of the implant. Specifically bioactive coatings, such as hydroxyapatite, carbonate apatite and dicalcium phosphate dehydrate, have been deposited on carbon/carbon (C/C) composites to change the bio-inert surface state. This work focused on the effects of voltages and electrolyte concentrations of pulsed electrodeposition on apatite layer. The apatite coatings thus synthesized were then structurally, morphologically and chemically characterized using X-ray diffraction, scanning electron microscopy, Transmission electron microscopy and Fourier-transform infrared spectroscopy...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28627779/new-horizon-for-breast-cancer-biomarker-discoveries-what-might-the-liquid-biopsy-of-nipple-aspirate-fluid-hold
#15
Ferdinando Mannello
The existence of cellular, molecular and biochemical heterogeneity of human breast cancers reveals the intricacy of biomarkers complexity, stimulating studies on new approaches (like "liquid biopsies") for the improvements in precision medicine. Breast cancer is recognized as a leading cause of morbidity and mortality worldwide with tumors significantly diverse and containing many types of cells showing different genetic and epigenetic profiles. In this field, the technology of Liquid Biopsy (applied to a fluid produced by breast gland, named nipple aspirate fluids, NAF) highlights the power of combining basic and clinical research...
June 19, 2017: Proteomics. Clinical Applications
https://www.readbyqxmd.com/read/28627346/-study-on-rac1-mapk-erk-pathway-mediated-mechanism-and-role-in-rats-with-ventilator-induced-lung-injury
#16
Guanghua Tao, Linghui Pan, Ren Jing, Fei Lin, Huijun Dai, Wanyun Ge
OBJECTIVE: To investigate the role of Ras-related C3 botulinum toxin substrate 1/mitogen-activated protein kinase/extracellular signal-regulated kinase (Rac1/MAPK/ERK) signal pathway in rats with ventilator induced lung injury (VILI) and its mechanism. METHODS: Thirty Sprague-Dawley (SD) rats were randomly divided into spontaneous respiration group, normal tidal volume (VT) group and high VT group with 10 rats in each group. The rats in spontaneous respiration group were kept their spontaneous breathing...
March 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/28626096/-analgesic-effect-of-buccal-acupuncture-on-acute-arthritis-in-rabbits-and-underlying-mechanisms
#17
Wangjun Jie, Xiaoli Fang, Ruisheng Pu, Chenghong Su, Yanju Zhang, Yongle Pu, Chenguang Yang
To observe the analgesic effect of acupuncture and to explore its central analgesic mechanism in rheumatoid arthritis rabbits.
 Methods: A total of 60 flap-eared white rabbits were randomly assigned into a normal control group (n=6), a model group (n=6), a body-acupuncture group (n=24), and a buccal acupuncture group (n=24). The later 2 groups were further randomly assigned into 0, 0.5, 1, and 2 h subgroups, with 6 cases in each group. The rheumatoid arthritis model was established by induction of egg-albumin...
May 28, 2017: Zhong Nan da Xue Xue Bao. Yi Xue Ban, Journal of Central South University. Medical Sciences
https://www.readbyqxmd.com/read/28625511/lung-fluid-clearance-in-chronic-heart-failure-patients
#18
Dani-Louise Dixon, Carmine G De Pasquale, Mark D Lawrence, Elena Cavallaro, Vito Rubino, Andrew D Bersten
Chronic elevation of pulmonary microvascular pressure (Pmv) consistently leads to alveolocapillary barrier thickening and reduction in the filtration coefficient. In animal models of chronic heart failure (CHF) the lung remains dry despite hydrostatic forces. As fluid flux is bi-directional, it has been postulated that an increase in alveolar fluid clearance may facilitate the dry lung when Pmv is chronically elevated. In this study we aimed to examine alveolar fluid clearance in ambulatory patients with CHF secondary to left ventricular (LV) systolic dysfunction compared against non-CHF controls...
May 26, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28625306/spinal-induced-hypotension-incidence-mechanisms-prophylaxis-and-management-summarizing-20-years-of-research
#19
REVIEW
Jennifer E Lee, Ronald B George, Ashraf S Habib
Hypotension commonly occurs in parturients undergoing cesarean delivery under spinal anesthesia. This leads to maternal and neonatal adverse outcomes, including maternal nausea and vomiting and fetal acidosis, and might even lead to cardiovascular collapse if not treated. Arterial dilatation and reduction in systemic vascular resistance are the major contributors to spinal-induced hypotension. Therefore, strategies aimed at expanding the intravascular volume with fluid loading or increasing venous return with lower extremities mechanical compression and lateral tilt have had limited effectiveness in the management of spinal-induced hypotension...
March 2017: Best Practice & Research. Clinical Anaesthesiology
https://www.readbyqxmd.com/read/28625256/-comparison-of-effect-of-norepinephrine-and-terlipressin-on-patients-with-ards-combined-with-septic-shock-a-prospective-single-blind-randomized-controlled-trial
#20
Zhi Chen, Ping Zhou, Yuanhua Lu, Chunli Yang
OBJECTIVE: To approach the effect of different vasopressor on hemodynamics, volume responsiveness, fluid volume balance, renal function and prognosis in patients with acute respiratory distress syndrome (ARDS) complicated with septic shock. METHODS: A prospective single-blind randomized controlled trial was conducted. ARDS patients with septic shock admitted to the Department of Critical Care Medicine of Jiangxi Provincial People's Hospital from January 1st, 2015 to May 1st, 2016 were enrolled...
February 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
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