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https://www.readbyqxmd.com/read/29314764/biomimetic-fetal-rotation-bioreactor-for-engineering-bone-tissues-effect-of-cyclic-strains-on-upregulation-of-osteogenic-gene-expression
#1
Akhilandeshwari Ravichandran, Feng Wen, Jing Lim, Mark Seow Khoon Chong, Jerry K Y Chan, Swee-Hin Teoh
Cells respond to physiological mechanical stresses especially during early fetal development. Adopting a biomimetic approach, it is necessary to develop bioreactor systems to explore the effects of physiologically relevant mechanical strains and shear stresses for functional tissue growth and development. This study introduces a multimodal bioreactor system that allows application of cyclic compressive strains on premature bone grafts that are cultured under biaxial rotation (chamber rotation about two axes) conditions for bone tissue engineering...
January 3, 2018: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/29304844/the-uae-healthy-future-study-a-pilot-for-a-prospective-cohort-study-of-20-000-united-arab-emirates-nationals
#2
Abdishakur Abdulle, Abdullah Alnaeemi, Abdullah Aljunaibi, Abdulrahman Al Ali, Khaled Al Saedi, Eiman Al Zaabi, Naima Oumeziane, Marina Al Bastaki, Mohammed Al-Houqani, Fatma Al Maskari, Ayesha Al Dhaheri, Syed M Shah, Tom Loney, Mohamed El-Sadig, Abderrahim Oulhaj, Leila Abdel Wareth, Wael Al Mahmeed, Habiba Alsafar, Benjamin Hirsch, Fatme Al Anouti, Jamila Yaaqoub, Claire K Inman, Aisha Al Hamiz, Ayesha Al Hosani, Muna Haji, Teeb Alsharid, Thekra Al Zaabi, Fatima Al Maisary, Divya Galani, Tim Sprosen, Omar El Shahawy, Jiyoung Ahn, Tomas Kirchhoff, Ravichandran Ramasamy, Ann Marie Schmidt, Richard Hayes, Scott Sherman, Raghib Ali
BACKGROUND: The United Arab Emirates (UAE) is faced with a rapidly increasing burden of non-communicable diseases including obesity, diabetes, and cardiovascular disease. The UAE Healthy Future study is a prospective cohort designed to identify associations between risk factors and these diseases amongst Emiratis. The study will enroll 20,000 UAE nationals aged ≥18 years. Environmental and genetic risk factors will be characterized and participants will be followed for future disease events...
January 5, 2018: BMC Public Health
https://www.readbyqxmd.com/read/29259282/analysis-of-killing-of-growing-cells-and-dormant-and-germinated-spores-of-bacillus-species-by-black-silicon-nanopillars
#3
Sonali Ghosh, Shanyuan Niu, Maya Yankova, Matthew Mecklenburg, Stephen M King, Jayakanth Ravichandran, Rajiv K Kalia, Aiichiro Nakano, Priya Vashishta, Peter Setlow
Black silicon (bSi) wafers with a high density of high-aspect ratio nanopillars have recently been suggested to have mechanical bactericidal activity. However, it remains unclear whether bSi with the nanopillars can kill only growing bacterial cells or also dormant spores that are harder to kill. We have reexamined the cidal activity of bSi on growing cells, dormant and germinated spores of B. subtilis, and dormant spores of several other Bacillus species by incubation on bSi wafers with and without nanopillars...
December 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29237722/pannexin-1-channels-as-an-unexpected-new-target-of-the-anti-hypertensive-drug-spironolactone
#4
Miranda E Good, Yu-Hsin Chiu, Ivan K Poon, Christopher B Medina, Joshua T Butcher, Suresh K Mendu, Leon J DeLalio, Alexander W Lohman, Norbert Leitinger, Eugene J Barrett, Ulrike M Lorenz, Bimal N Desai, Iris Z Jaffe, Douglas Bayliss, Brant E Isakson, Kodi S Ravichandran
Rationale: Resistant hypertension is a major health concern with unknown etiology. Spironolactone is an effective anti-hypertensive drug, especially for patients with resistant hypertension, and is considered by the World Health Organization (WHO) as an "essential" medication. Although spironolactone can act at the mineralocorticoid receptor (NR3C2), there is increasing evidence of mineralocorticoid receptor (MR)-independent effects of spironolactone. Objective: Here, we detail the unexpected discovery that pannexin 1 (Panx1) channels could be a relevant in vivo target of spironolactone...
December 13, 2017: Circulation Research
https://www.readbyqxmd.com/read/29210772/bleeding-complication-rates-are-higher-in-females-after-continuous-flow-left-ventricular-assist-device-implantation
#5
Zubin Yavar, Jennifer A Cowger, Sina L Moainie, Christopher T Salerno, Ashwin K Ravichandran
The aims of this analysis were to characterize the burden and timing of bleeding events in females versus males on left ventricular assist device (LVAD) support. A single-center retrospective review of 375 patients receiving continuous-flow LVADs was performed. Bleeding events included gastrointestinal, naso-oropharyngeal, gynecologic (GYN), intracranial hemorrhage (ICH), and mediastinal bleeding. Cox hazard ratios (HRs) [95% CI] and incident event rates for females versus males were calculated. Eighty-four females (22%) and 291 males (78%) received an LVAD...
November 27, 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/29204365/the-age-rage-axis-in-an-arab-population-the-united-arab-emirates-healthy-futures-uaehfs-pilot-study
#6
Claire K Inman, Abdullah Aljunaibi, Hyunwook Koh, Abdishakur Abdulle, Raghib Ali, Abdullah Alnaeemi, Eiman Al Zaabi, Naima Oumeziane, Marina Al Bastaki, Mohammed Al-Houqani, Fatma Al-Maskari, Ayesha Al Dhaheri, Syed M Shah, Laila Abdel Wareth, Wael Al Mahmeed, Habiba Alsafar, Fatme Al Anouti, Ayesha Al Hosani, Muna Haji, Divya Galani, Matthew J O'Connor, Jiyoung Ahn, Tomas Kirchhoff, Scott Sherman, Richard B Hayes, Huilin Li, Ravichandran Ramasamy, Ann Marie Schmidt
Aims: The transformation of the United Arab Emirates (UAE) from a semi-nomadic to a high income society has been accompanied by increasing rates of obesity and Type 2 diabetes mellitus. We examined if the AGE-RAGE (receptor for advanced glycation endproducts) axis is associated with obesity and diabetes mellitus in the pilot phase of the UAE Healthy Futures Study (UAEHFS). Methods: 517 Emirati subjects were enrolled and plasma/serum levels of AGE, carboxy methyl lysine (CML)-AGE, soluble (s)RAGE and endogenous secretory (es)RAGE were measured along with weight, height, waist and hip circumference (WC/HC), blood pressure, HbA1c, Vitamin D levels and routine chemistries...
December 2017: Journal of Clinical & Translational Endocrinology
https://www.readbyqxmd.com/read/29190082/pourbaix-diagram-proton-coupled-electron-transfer-and-decay-kinetics-of-a-protein-tryptophan-radical-comparing-the-redox-properties-of-w32%C3%A2-and-y32%C3%A2-generated-inside-the-structurally-characterized-%C3%AE-3w-and-%C3%AE-3y-proteins
#7
Starla D Glover, Robin Tyburski, Li Liang, Cecilia Tommos, Leif Hammarström
Protein "hole" hopping typically involves spatially arranged redox-active tryptophan and/or tyrosine residues. Thermodynamic information is scarce for this type of process. The well-structured α3W model protein was studied by protein film square wave voltammetry and transient absorption spectroscopy to obtain a comprehensive thermodynamic and kinetic description of a buried tryptophan residue. A Pourbaix diagram, correlating thermodynamic potentials (E°') with pH, is reported for W32 in α3W and compared to equivalent data recently presented for Y32 in α3Y (Ravichandran, K...
November 30, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29117042/impact-of-patient-distance-from-ventricular-assist-device-implanting-center-on-short-and-long-term-outcomes
#8
Ashwin K Ravichandran, Palak Shah, Ramesh Singh, Keith D Aaronson, Francis D Pagani, John Stulak, Shannon M Dunlay, Todd F Dardas, Nahush A Mokadam, Christopher T Salerno, Jennifer A Cowger
Highly specialized left ventricular assist device care is not readily available in many areas, potentially limiting access to therapy. This retrospective analysis examines the relationship of outcomes by patient distance from implanting left ventricular assist device center within the Mechanical Circulatory Support Research Network. Zip codes were used to calculate patient distance, with the primary outcome of interest being 3-year survival by distance from the surgical center. Secondary outcomes included 90-day survival and incident event rates for the following: gastrointestinal bleeding, infection, cerebral event, and pump thrombosis...
November 7, 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/29116131/context-dependent-compensation-among-phosphatidylserine-recognition-receptors
#9
Kristen K Penberthy, Claudia Rival, Laura S Shankman, Michael H Raymond, Jianye Zhang, Justin S A Perry, Chang Sup Lee, Claudia Z Han, Suna Onengut-Gumuscu, Krzysztof Palczewski, Jeffrey J Lysiak, Kodi S Ravichandran
Phagocytes express multiple phosphatidylserine (PtdSer) receptors that recognize apoptotic cells. It is unknown whether these receptors are interchangeable or if they play unique roles during cell clearance. Loss of the PtdSer receptor Mertk is associated with apoptotic corpse accumulation in the testes and degeneration of photoreceptors in the eye. Both phenotypes are linked to impaired phagocytosis by specialized phagocytes: Sertoli cells and the retinal pigmented epithelium (RPE). Here, we overexpressed the PtdSer receptor BAI1 in mice lacking MerTK (Mertk (-/-) Bai1 (Tg) ) to evaluate PtdSer receptor compensation in vivo...
November 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29095736/outcomes-with-the-tandem-protek-duo-dual-lumen-percutaneous-right-ventricular-assist-device
#10
Ashwin K Ravichandran, David A Baran, Kelly Stelling, Jennifer A Cowger, Christopher T Salerno
Recently, a percutaneous right ventricular assist device (RVAD) called the TandemLife Protek Duo (TPD; TandemLife, Pittsburgh, PA) has been introduced. The Protek Duo (TPD) is a temporary RVAD placed via the right internal jugular vein, capable of providing up to 4.5 L of flow. We report a two-center experience using the TPD in 17 patients with right ventricular (RV) failure, 12 of whom were post-left ventricular assist device (LVAD) implantation.
October 31, 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/29064668/real-time-observation-of-exciton-phonon-coupling-dynamics-in-self-assembled-hybrid-perovskite-quantum-wells
#11
Limeng Ni, Uyen Huynh, Alexandre Cheminal, Tudor H Thomas, Ravichandran Shivanna, Ture F Hinrichsen, Shahab Ahmad, Aditya Sadhanala, Akshay Rao
Self-assembled hybrid perovskite quantum wells have attracted attention due to their tunable emission properties, ease of fabrication, and device integration. However, the dynamics of excitons in these materials, especially how they couple to phonons, remains an open question. Here, we investigate two widely used materials, namely, butylammonium lead iodide (CH3(CH2)3NH3)2PbI4 and hexylammonium lead iodide (CH3(CH2)5NH3)2PbI4, both of which exhibit broad photoluminescence tails at room temperature. We performed femtosecond vibrational spectroscopy to obtain a real-time picture of the exciton-phonon interaction and directly identified the vibrational modes that couple to excitons...
October 27, 2017: ACS Nano
https://www.readbyqxmd.com/read/29032078/efficacy-and-safety-of-once-monthly-pasireotide-in-cushing-s-disease-a-12-month-clinical-trial
#12
André Lacroix, Feng Gu, Wilson Gallardo, Rosario Pivonello, Yerong Yu, Przemysław Witek, Marco Boscaro, Roberto Salvatori, Masanobu Yamada, Libuse Tauchmanova, Michael Roughton, Shoba Ravichandran, Stephan Petersenn, Beverly M K Biller, John Newell-Price
BACKGROUND: Cushing's disease is a rare debilitating endocrine disorder for which few prospective interventional studies have been done. We report results of the first phase 3 trial assessing long-acting intramuscular pasireotide in patients with Cushing's disease. METHODS: In this phase 3 clinical trial we recruited patients aged 18 years or older with persistent, recurrent, or de-novo (non-surgical candidates) Cushing's disease who had a mean urinary free cortisol (mUFC) concentration (from three 24 h samples) of 1·5-5·0 times the upper limit of normal (ULN), a normal or greater than normal morning plasma adrenocorticotropic hormone concentration, and a pituitary source of Cushing's syndrome, from 57 sites across 19 countries...
October 12, 2017: Lancet Diabetes & Endocrinology
https://www.readbyqxmd.com/read/28974997/the-door-to-needle-time-metric-can-be-achieved-via-telestroke
#13
Ganesh Asaithambi, Amy L Castle, Michael A Sperl, Jayashree Ravichandran, Aditi Gupta, Bridget M Ho, Sandra K Hanson
The administration of intravenous (IV) alteplase to patients with stroke via telestroke (TS) can be safe and effective. It remains unclear how quickly IV alteplase occurs during TS evaluations. We sought to compare door to needle times (DNTs) between patients receiving IV alteplase who present directly to our comprehensive stroke center (CSC) and those presenting to community hospitals in our TS network. Consecutive patients with acute ischemic stroke (AIS) who presented to emergency departments and received IV alteplase between August 2014 and June 2015 were identified at our CSC and TS network...
October 2017: Neurohospitalist
https://www.readbyqxmd.com/read/28955996/dynamic-approach-to-predict-ph-profiles-of-biologically-relevant-buffers
#14
K Ganesh, R Soumen, Y Ravichandran, Janarthanan
Recently, dynamic approach has been applied to determine the steady state concentrations of multiple ionic species present in complex buffers at equilibrium. Here, we have used the dynamic approach to explicitly model the pH profiles of biologically relevant phosphate buffer and universal buffer (a mixture of three tri-protic acids such as citric acid, boric acid and phosphoric acid). The results from dynamic approach are identical to that of the conventional algebraic approach, but with an added advantage that the dynamic approach, allow for the modelling of complex buffer systems relatively easy compared to that of algebraic method...
March 2017: Biochemistry and Biophysics Reports
https://www.readbyqxmd.com/read/28873162/mutation-detection-in-patients-with-advanced-cancer-by-universal-sequencing-of-cancer-related-genes-in-tumor-and-normal-dna-vs-guideline-based-germline-testing
#15
Diana Mandelker, Liying Zhang, Yelena Kemel, Zsofia K Stadler, Vijai Joseph, Ahmet Zehir, Nisha Pradhan, Angela Arnold, Michael F Walsh, Yirong Li, Anoop R Balakrishnan, Aijazuddin Syed, Meera Prasad, Khedoudja Nafa, Maria I Carlo, Karen A Cadoo, Meg Sheehan, Megan H Fleischut, Erin Salo-Mullen, Magan Trottier, Steven M Lipkin, Anne Lincoln, Semanti Mukherjee, Vignesh Ravichandran, Roy Cambria, Jesse Galle, Wassim Abida, Marcia E Arcila, Ryma Benayed, Ronak Shah, Kenneth Yu, Dean F Bajorin, Jonathan A Coleman, Steven D Leach, Maeve A Lowery, Julio Garcia-Aguilar, Philip W Kantoff, Charles L Sawyers, Maura N Dickler, Leonard Saltz, Robert J Motzer, Eileen M O'Reilly, Howard I Scher, Jose Baselga, David S Klimstra, David B Solit, David M Hyman, Michael F Berger, Marc Ladanyi, Mark E Robson, Kenneth Offit
Importance: Guidelines for cancer genetic testing based on family history may miss clinically actionable genetic changes with established implications for cancer screening or prevention. Objective: To determine the proportion and potential clinical implications of inherited variants detected using simultaneous sequencing of the tumor and normal tissue ("tumor-normal sequencing") compared with genetic test results based on current guidelines. Design, Setting, and Participants: From January 2014 until May 2016 at Memorial Sloan Kettering Cancer Center, 10 336 patients consented to tumor DNA sequencing...
September 5, 2017: JAMA: the Journal of the American Medical Association
https://www.readbyqxmd.com/read/28730183/aberrant-cerebellar-connectivity-in-bipolar-disorder-with-psychosis
#16
Ann K Shinn, Youkyung S Roh, Caitlin T Ravichandran, Justin T Baker, Dost Öngür, Bruce M Cohen
BACKGROUND: The cerebellum, which modulates affect and cognition in addition to motor functions, may contribute substantially to the pathophysiology of mood and psychotic disorders, such as bipolar disorder. A growing literature points to cerebellar abnormalities in bipolar disorder. However, no studies have investigated the topographic representations of resting state cerebellar networks in bipolar disorder, specifically their functional connectivity to cerebral cortical networks. METHODS: Using a well-defined cerebral cortical parcellation scheme as functional connectivity seeds, we compared ten cerebellar resting state networks in 49 patients with bipolar disorder and a lifetime history of psychotic features and 55 healthy control participants matched for age, sex, and image signal-to-noise ratio...
July 2017: Biological Psychiatry: Cognitive Neuroscience and Neuroimaging
https://www.readbyqxmd.com/read/28719205/theoretical-investigations-on-the-mechanism-and-kinetics-of-oh-radical-initiated-reactions-of-monochloroacetic-acid
#17
R Bhuvaneswari, L Sandhiya, K Senthilkumar
The oxidation mechanism of monochloroacetic acid (CH2ClCOOH) by OH radical has been systematically investigated employing quantum mechanical methods coupled with kinetic calculation using canonical variational transition state theory. Three distinct transition states were identified for the titled reaction, two corresponding to the hydrogen atom abstraction and one corresponding to the chlorine atom abstraction. The rate constants of the titled reactions are computed over the temperature range 278-350 K, and the branching ratios calculated for the hydrogen atom abstraction from the -C(O)OH site and the -CH2Cl site are 25 and 75%, respectively, at 298 K...
August 2, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28706065/global-analysis-of-protein-folding-using-massively-parallel-design-synthesis-and-testing
#18
Gabriel J Rocklin, Tamuka M Chidyausiku, Inna Goreshnik, Alex Ford, Scott Houliston, Alexander Lemak, Lauren Carter, Rashmi Ravichandran, Vikram K Mulligan, Aaron Chevalier, Cheryl H Arrowsmith, David Baker
Proteins fold into unique native structures stabilized by thousands of weak interactions that collectively overcome the entropic cost of folding. Although these forces are "encoded" in the thousands of known protein structures, "decoding" them is challenging because of the complexity of natural proteins that have evolved for function, not stability. We combined computational protein design, next-generation gene synthesis, and a high-throughput protease susceptibility assay to measure folding and stability for more than 15,000 de novo designed miniproteins, 1000 natural proteins, 10,000 point mutants, and 30,000 negative control sequences...
July 14, 2017: Science
https://www.readbyqxmd.com/read/28692527/sildenafil-in-left-ventricular-assist-device-is-safe-and-well-tolerated
#19
Ashwin K Ravichandran, Shane J LaRue, Eric Novak, Susan A Joseph, Joel D Schilling
Right heart failure is a potentially devastating complication of mechanical circulatory support, occurring at a rate of 0.49 events per 100 patient-months. Pulmonary vasodilators such as phosphodiesterase-5 inhibitors (PDE5i) have been frequently used to unload the right ventricle in left ventricular assist device (LVAD) patients, but there is scant evidence to support this practice. The purpose of this analysis is to provide additional data regarding the safety and efficacy of the PDE5i sildenafil in a real world population of patients supported with LVADs at Washington University in St...
July 7, 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/28638321/membrane-guanylate-cyclase-catalytic-subdomain-structure-and-linkage-with-calcium-sensors-and-bicarbonate
#20
Sarangan Ravichandran, Teresa Duda, Alexandre Pertzev, Rameshwar K Sharma
Membrane guanylate cyclase (MGC) is a ubiquitous multi-switching cyclic GMP generating signaling machine linked with countless physiological processes. In mammals it is encoded by seven distinct homologous genes. It is a single transmembrane spanning multi-modular protein; composed of integrated blocks and existing in homo-dimeric form. Its core catalytic domain (CCD) module is a common transduction center where all incoming signals are translated into the production of cyclic GMP, a cellular signal second messenger...
2017: Frontiers in Molecular Neuroscience
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