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https://www.readbyqxmd.com/read/28731323/analyzing-liposomal-drug-delivery-systems-in-three-dimensional-cell-culture-models-using-maldi-imaging-mass-spectrometry
#1
Jessica K Lukowski, Eric M Weaver, Amanda B Hummon
Cancer chemotherapeutics often fail to reach all diseased cells. To help solve this problem, researchers are investigating novel drug delivery systems. Liposomes are an attractive option due to their low toxicity, high biocompatibility, and potential to carry a large amount of a drug to the tumor site, all while avoiding being eliminated from the body. This study evaluates the penetration of doxorubicin-encased liposomes into three-dimensional cell cultures, or spheroids. Liposomes composed of lipids containing head groups of phosphatidylcholine (PC), phosphatidylethanolamine (PE), and cholesterol were created by extrusion...
July 21, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28730546/mammalian-mitochondrial-rnas-are-degraded-in-the-mitochondrial-intermembrane-space-by-rnaset2
#2
Peipei Liu, Jinliang Huang, Qian Zheng, Leiming Xie, Xinping Lu, Jie Jin, Geng Wang
Mammalian mitochondrial genome encodes a small set of tRNAs, rRNAs, and mRNAs. The RNA synthesis process has been well characterized. How the RNAs are degraded, however, is poorly understood. It was long assumed that the degradation happens in the matrix where transcription and translation machineries reside. Here we show that contrary to the assumption, mammalian mitochondrial RNA degradation occurs in the mitochondrial intermembrane space (IMS) and the IMS-localized RNASET2 is the enzyme that degrades the RNAs...
July 20, 2017: Protein & Cell
https://www.readbyqxmd.com/read/28723462/against-the-role-of-inflammatory-markers-in-renal-cell-carcinoma-prognosis-the-missing-link-between-evidence-of-association-and-clinical-applicability
#3
Alessandro Larcher, Paolo Dell'Oglio, Andrea Salonia, Umberto Capitanio
Although an association between inflammatory markers (IMs) and renal cell carcinoma (RCC) prognosis has been proven, how to translate such information into treatment strategy has not been determined. The strongest argument against the use of IMs in the management of patients diagnosed with RCC is the missing link between evidence of association and clinical applicability.
October 2016: European Urology Focus
https://www.readbyqxmd.com/read/28717220/imaging-mass-spectrometry-and-ms-ms-molecular-networking-reveals-chemical-interactions-among-cuticular-bacteria-and-pathogenic-fungi-associated-with-fungus-growing-ants
#4
Cristopher A Boya P, Hermógenes Fernández-Marín, Luis C Mejía, Carmenza Spadafora, Pieter C Dorrestein, Marcelino Gutiérrez
The fungus-growing ant-microbe symbiosis is an ideal system to study chemistry-based microbial interactions due to the wealth of microbial interactions described, and the lack of information on the molecules involved therein. In this study, we employed a combination of MALDI imaging mass spectrometry (MALDI-IMS) and MS/MS molecular networking to study chemistry-based microbial interactions in this system. MALDI IMS was used to visualize the distribution of antimicrobials at the inhibition zone between bacteria associated to the ant Acromyrmex echinatior and the fungal pathogen Escovopsis sp...
July 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28714776/tissue-localization-of-glycosphingolipid-accumulation-in-a-gaucher-disease-mouse-brain-by-lc-esi-ms-ms-and-high-resolution-maldi-imaging-mass-spectrometry
#5
E Ellen Jones, Wujuan Zhang, Xueheng Zhao, Cristine Quiason, Stephanie Dale, Sheerin Shahidi-Latham, Gregory A Grabowski, Kenneth D R Setchell, Richard R Drake, Ying Sun
To better understand regional brain glycosphingolipid (GSL) accumulation in Gaucher disease (GD) and its relationship to neuropathology, a feasibility study using mass spectrometry and immunohistochemistry was conducted using brains derived from a GD mouse model (4L/PS/NA) homozygous for a mutant GCase (V394L [4L]) and expressing a prosaposin hypomorphic (PS-NA) transgene. Whole brains from GD and control animals were collected using one hemisphere for MALDI FTICR IMS analysis and the other for quantitation by LC-ESI-MS/MS...
July 1, 2017: SLAS Discovery
https://www.readbyqxmd.com/read/28713152/metastatic-anaplastic-lymphoma-kinase-1-alk-1-rearranged-inflammatory-myofibroblastic-sarcoma-to-the-brain-with-leptomeningeal-involvement-favorable-response-to-serial-alk-inhibitors-a-case-report
#6
Cai Yuan, Muchou J Ma, John V Parker, Tarek M Mekhail
BACKGROUND ALK gene rearrangements as oncogenic drivers have been described in many cancers, including inflammatory myofibroblastic sarcoma (IMS). The first-generation ALK inhibitor was limited in its ability to cross the blood-brain-barrier to treat brain metastasis. Drug-resistance invariably develops over time in ALK-rearranged tumors, which leads to disease progression. The newer generations of ALK inhibitors are designed to have higher potency in ALK inhibition and improved CNS penetration. CASE REPORT We report a rare case of pulmonary IMS with ALK-1 gene rearrangement and multiple brain metastases as initial presentation...
July 17, 2017: American Journal of Case Reports
https://www.readbyqxmd.com/read/28712550/towards-an-automatic-lab-on-valve-ion-mobility-spectrometric-system-for-detection-of-cocaine-abuse
#7
David J Cocovi-Solberg, Francesc A Esteve-Turrillas, Sergio Armenta, Miguel de la Guardia, Manuel Miró
A lab-on-valve miniaturized system integrating on-line disposable micro-solid phase extraction has been interfaced with ion mobility spectrometry for the accurate and sensitive determination of cocaine and ecgonine methyl ester in oral fluids. The method is based on the automatic loading of 500μL of oral fluid along with the retention of target analytes and matrix clean-up by mixed-mode cationic/reversed-phase solid phase beads, followed by elution with 100μL of 2-propanol containing (3% v/v) ammonia, which are online injected into the IMS...
June 30, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28712506/vdac1-functions-in-ca-2-homeostasis-and-cell-life-and-death-in-health-and-disease
#8
REVIEW
Varda Shoshan-Barmatz, Yakov Krelin, Anna Shteinfer-Kuzmine
In the outer mitochondrial membrane (OMM), the voltage-dependent anion channel 1 (VDAC1) serves as a mitochondrial gatekeeper, controlling the metabolic and energy cross-talk between mitochondria and the rest of the cell. VDAC1 also functions in cellular Ca(2+) homeostasis by transporting Ca(2+) in and out of mitochondria. VDAC1 has also been recognized as a key protein in mitochondria-mediated apoptosis, contributing to the release of apoptotic proteins located in the inter-membranal space (IMS) and regulating apoptosis via association with pro- and anti-apoptotic members of the Bcl-2 family of proteins and hexokinase...
June 23, 2017: Cell Calcium
https://www.readbyqxmd.com/read/28704718/calibration-and-validation-of-a-mcc-ims-prototype-for-exhaled-propofol-online-measurement
#9
Felix Maurer, Larissa Walter, Martin Geiger, Jörg Ingo Baumbach, Daniel I Sessler, Thomas Volk, Sascha Kreuer
Propofol is a commonly used intravenous general anesthetic. Multi-capillary column (MCC) coupled Ion-mobility spectrometry (IMS) can be used to quantify exhaled propofol, and thus estimate plasma drug concentration. Here, we present results of the calibration and analytical validation of a MCC/IMS pre-market prototype for propofol quantification in exhaled air. Calibration with a reference gas generator yielded an R(2)≥0.99 with a linear array for the calibration curve from 0 to 20 ppbv. The limit of quantification was 0...
July 1, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28697795/improved-prosthetic-hand-control-with-concurrent-use-of-myoelectric-and-inertial-measurements
#10
Agamemnon Krasoulis, Iris Kyranou, Mustapha Suphi Erden, Kianoush Nazarpour, Sethu Vijayakumar
BACKGROUND: Myoelectric pattern recognition systems can decode movement intention to drive upper-limb prostheses. Despite recent advances in academic research, the commercial adoption of such systems remains low. This limitation is mainly due to the lack of classification robustness and a simultaneous requirement for a large number of electromyogram (EMG) electrodes. We propose to address these two issues by using a multi-modal approach which combines surface electromyography (sEMG) with inertial measurements (IMs) and an appropriate training data collection paradigm...
July 11, 2017: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/28696079/impact-of-protease-inhibitor-based-anti-retroviral-therapy-on-outcomes-for-hiv-kidney-transplant-recipients
#11
Deirdre Sawinski, Brittany A Shelton, Shikha Mehta, Rhiannon D Reed, Paul A MacLennan, Sally Gustafson, Dorry L Segev, Jayme E Locke
Excellent outcomes have been demonstrated among select HIV-positive kidney transplant (KT) recipients with well-controlled infection, but to date no national study has explored outcomes among HIV+ KT recipients by antiretroviral therapy (ART) regimen. IMS pharmacy fills (1/1/01 - 10/1/12) were linked with SRTR data. 332 recipients with pre- and post-transplant fills were characterized by ART at time of transplant as protease inhibitor (PI) or non-PI based ART (88 PI vs. 244 non-PI). Cox proportional hazards models were adjusted for recipient and donor characteristics...
July 11, 2017: American Journal of Transplantation
https://www.readbyqxmd.com/read/28695498/fmiso-accumulation-in-tumor-is-dependent-on-glutathione-conjugation-capacity-in-addition-to-hypoxic-state
#12
Yukiko Masaki, Yoichi Shimizu, Takeshi Yoshioka, Ken-Ichi Nishijima, Songji Zhao, Kenichi Higashino, Yoshito Numata, Nagara Tamaki, Yuji Kuge
OBJECTIVE: (18)F-fluoromisonidazole (FMISO), a well-known PET imaging probe for diagnosis of hypoxia, is believed to accumulate in hypoxic cells via covalent binding with macromolecules after reduction of the nitro group. Previously, we showed the majority of (18)F-FMISO was incorporated into low-molecular-weight metabolites in hypoxic tumors, and the glutathione conjugate of reduced FMISO (amino-FMISO-GS) distributed in the tumor hypoxic regions as revealed by imaging mass spectrometry (IMS)...
July 10, 2017: Annals of Nuclear Medicine
https://www.readbyqxmd.com/read/28692073/-le-transizioni-armoniche-valutate-con-l-assessing-interpersonal-motivations-in-transcripts-sono-in-grado-di-discriminare-tra-individui-sicuri-e-disorganizzati-all-adult-attachment-interview
#13
Benedetto Farina, Fabio Monticelli, Maria Giuseppina Mantione, Lucia Pancheri, Anna Maria Speranza, Maurizio Brasini, Claudio Imperatori
RIASSUNTO. Obiettivo. L'Assessing Interpersonal Motivations in Transcripts (AIMIT) è un valido sistema di codifica che valuta l'attivazione dei sistemi motivazionali interpersonali (IMS) nel trascritto della seduta psicoterapeutica. Il Transition Index (TI) è una misura dell'AIMIT che riflette il livello di organizzazione, sincronizzazione e armonia tra 2 o più IMS quando questi mutano rapidamente o simultaneamente all'interno del dialogo clinico. Tale indice è ritenuto essere una misura di integrazione e coerenza dello stato della mente del paziente all'interno della seduta terapeutica...
May 2017: Rivista di Psichiatria
https://www.readbyqxmd.com/read/28689947/a-novel-iliac-morphology-score-predicts-procedural-mortality-and-major-vascular-complications-in-transfemoral-aortic-valve-replacement
#14
Juliet Blakeslee-Carter, David Dexter, Paul Mahoney, Sadie Ahanchi, Samuel Steerman, Sebastian Larion, Brandon Cain, Jean Panneton
OBJECTIVES: Vascular complications remain a significant technical challenge for transfemoral TAVR (Transcatheter Aortic Valve Replacement). The goal of this study was to develop a pre-operative tool for prediction of major vascular complications of TAVR. METHODS: A retrospective review was performed of all patients who underwent transfemoral TAVR at a tertiary medical center from 2011-2015. Iliofemoral arterial measurements were obtained with CTA 3D reconstructions images and an Iliac Morphology Score (IMS) was created from these measurements...
July 6, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28681358/delivering-transmembrane-peptide-complexes-to-the-gas-phase-using-nanodiscs-and-electrospray-ionization
#15
Jun Li, Michele R Richards, Elena N Kitova, John S Klassen
The gas-phase conformations of dimers of the channel-forming membrane peptide gramicidin A (GA), produced from isobutanol or aqueous solutions of GA-containing nanodiscs (NDs), are investigated using electrospray ionization-ion mobility separation-mass spectrometry (ESI-IMS-MS) and molecular dynamics (MD) simulations. The IMS arrival times measured for (2GA + 2Na)(2+) ions from isobutanol reveal three different conformations, with collision cross-sections (Ω) of 683 Å(2) (conformation 1, C1), 708 Å(2) (C2), and 737 Å(2) (C3)...
July 5, 2017: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/28674526/induction-of-cryptic-and-bioactive-metabolites-through-natural-dietary-components-in-an-endophytic-fungus-colletotrichum-gloeosporioides-penz-sacc
#16
Vijay K Sharma, Jitendra Kumar, Dheeraj K Singh, Ashish Mishra, Satish K Verma, Surendra K Gond, Anuj Kumar, Namrata Singh, Ravindra N Kharwar
Grape skin and turmeric extracts having the major components resveratrol and curcumin, respectively, were used for the induction of cryptic and bioactive metabolites in an endophytic fungus Colletotrichum gloeosporioides isolated from Syzygium cumini. The increase in total amount of crude compounds in grape skin and turmeric extract treated cultures was 272.48 and 174.32%, respectively, compared to the untreated control. Among six human pathogenic bacteria tested, the maximum inhibitory activity was found against Aeromonas hydrophila IMS/GN11 while no inhibitory activity was observed against Enterococcus faecalis IMS/GN7...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28660572/sample-preparation-and-analysis-for-imaging-mass-spectrometry
#17
Genea Edwards, Annia Mesa, Robert I Vazquez-Padron, Jane-Marie Kowalski, Sanjoy K Bhattacharya
Imaging mass spectrometry (IMS) is a novel quantitative technique used to investigative diverse biomolecules in tissue sections. Specifically, IMS uses analytical separation of mass spectrometry to determine the spatial distribution of certain lipids and/or proteins located directly on biological sections from a single tissue sample. Typically, IMS is combined with histological analysis to reveal additional distribution details of characterized biomolecules including cell type and/or subcellular localization...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28656664/poor-adherence-to-chronic-obstructive-pulmonary-disease-medications-in-primary-care-role-of-age-disease-burden-and-polypharmacy
#18
Davide L Vetrano, Elisa Bianchini, Graziano Onder, Iacopo Cricelli, Claudio Cricelli, Roberto Bernabei, Germano Bettoncelli, Francesco Lapi
AIM: The aim of the present study was to assess the occurrence and determinants of poor adherence to pharmacological treatment in a cohort of primary care patients with chronic obstructive pulmonary disease (COPD), paying special attention to the role of age, comorbidity and polypharmacy. METHODS: We identified a cohort of COPD patients using the primary care Italian Health Search - IMS Longitudinal Patient Database. We assessed 1-year adherence to COPD maintenance pharmacotherapy (encompassing inhaled corticosteroids, long-acting beta agonists and long-acting anticholinergics)...
June 28, 2017: Geriatrics & Gerontology International
https://www.readbyqxmd.com/read/28656639/comparison-of-immunomagnetic-separation-beads-for-detection-of-six-non-o157-shiga-toxin-producing-escherichia-coli-serogroups-in-different-matrices
#19
Autumn L Kraft, David W Lacher, Weilin L Shelver, Julie S Sherwood, Teresa M Bergholz
Immunomagnetic separation used with culture based methods has been a useful technique in the detection of pathogens. However, previous studies have not answered many of the necessary questions for real world applications. The objective of this study was to assess the efficacy of different IMS bead types in recovery of the correct serogroup from a mixture of big six non-O157 STEC strains. To determine the impact of different matrices on recovery, samples of sterile phosphate buffered saline (PBS), sterile and non-sterile cattle feces, ground beef, and lettuce were inoculated with 10 CFU ml(-1) mixture of isolates representing the six serogroups...
June 28, 2017: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/28654112/distinguishing-d-and-l-aspartic-and-isoaspartic-acids-in-amyloid-%C3%AE-peptides-with-ultrahigh-resolution-ion-mobility-spectrometry
#20
Xueyun Zheng, Liulin Deng, Erin S Baker, Yehia M Ibrahim, Vladislav A Petyuk, Richard D Smith
While α-linked amino acids in the l-form are exclusively utilized in mammalian protein building, β-linked and d-form amino acids also have important biological roles. Unfortunately, the structural elucidation and separation of these different amino acid types in peptides has been analytically challenging to date due to the numerous isomers present, limiting our knowledge about their existence and biological roles. Here, we utilized an ultrahigh resolution ion mobility spectrometry platform coupled with mass spectrometry (IMS-MS) to separate amyloid β (Aβ) peptides containing l-aspartic acid, d-aspartic acid, l-isoaspartic acid, and d-isoaspartic acid residues which span α- and β-linked amino acids in both d- and l-forms...
July 11, 2017: Chemical Communications: Chem Comm
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