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Hypoxia Imaging

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https://www.readbyqxmd.com/read/28922791/targeting-hypoxia-to-improve-non-small-cell-lung-cancer-outcome
#1
Ahmed Salem, Marie-Claude Asselin, Bart Reymen, Alan Jackson, Philippe Lambin, Catharine M L West, James P B O'Connor, Corinne Faivre-Finn
Oxygen deprivation (hypoxia) in non-small cell lung cancer (NSCLC) is an important factor in treatment resistance and poor survival. Hypoxia is an attractive therapeutic target, particularly in the context of radiotherapy, which is delivered to more than half of NSCLC patients. However, NSCLC hypoxia-targeted therapy trials have not yet translated into patient benefit. Recently, early termination of promising evofosfamide and tarloxotinib bromide studies due to futility highlighted the need for a paradigm shift in our approach to avoid disappointments in future trials...
January 1, 2018: Journal of the National Cancer Institute
https://www.readbyqxmd.com/read/28916603/phase-2a-clinical-trial-of-mitochondrial-protection-elamipretide-during-stent-revascularization-in-patients-with-atherosclerotic-renal-artery-stenosis
#2
Ahmed Saad, Sandra M S Herrmann, Alfonso Eirin, Christopher M Ferguson, James F Glockner, Haraldur Bjarnason, Michael A McKusick, Sanjay Misra, Lilach O Lerman, Stephen C Textor
BACKGROUND: Atherosclerotic renal artery stenosis reduces renal blood flow (RBF) and amplifies stenotic kidney hypoxia. Revascularization with percutaneous transluminal renal angioplasty (PTRA) and stenting often fails to recover renal function, possibly because of ischemia/reperfusion injury developing after PTRA. Elamipretide is a mitochondrial-targeted peptide that binds to cardiolipin and stabilizes mitochondrial function. We tested the hypothesis that elamipretide plus PTRA would improve renal function, oxygenation, and RBF in patients with atherosclerotic renal artery stenosis undergoing PTRA...
September 2017: Circulation. Cardiovascular Interventions
https://www.readbyqxmd.com/read/28915639/heptamethine-carbocyanine-dz-1-dye-for-near-infrared-fluorescence-imaging-of-hepatocellular-carcinoma
#3
Jiaze An, Ningning Zhao, Caiqin Zhang, Yong Zhao, Dengxu Tan, Ya Zhao, Bing Bai, Hai Zhang, Boyang Jason Wu, Changhong Shi
Near-infrared fluorescence (NIRF) dyes have recently emerged as promising tools for non-invasive imaging of different types of cancers. Here, we explored the potential utility of a NIRF DZ-1 dye, with dual imaging and tumour targeting functions, in hepatocellular carcinoma (HCC). We showed the preferential uptake of DZ-1 by HCC cells in vitro and in derived subcutaneous/orthotopic tumour xenografts, accompanied by a minimal effect on normal cells. DZ-1 simplified tumour growth profiling as well, since we were able to correlate NIRF signals with tumour volume and/or tumour-emitting luminescence in mice...
August 22, 2017: Oncotarget
https://www.readbyqxmd.com/read/28904098/characterization-of-ion-channels-and-o2-sensitivity-in-gill-neuroepithelial-cells-of-the-anoxia-tolerant-goldfish-carassius-auratus
#4
Peter C Zachar, Wen Pan, Michael G Jonz
The neuroepithelial cell (NEC) of the fish gill is an important model for O2 sensing in vertebrates; however, a complete picture of the chemosensory mechanisms in NECs is lacking, and O2 chemoreception in vertebrates that are tolerant to anoxia has yet not been explored. Using whole-cell patch-clamp recording, we characterized four types of ion channels in NECs isolated from the anoxia-tolerant goldfish. A Ca(2+)-dependent K(+) current (IKCa) peaked at ~20 mV, was potentiated by increased intracellular Ca(2+), and was reduced by 100 μM Cd(2+) A voltage-dependent inward current in Ba(2+) solution, with peak at 0 mV, confirmed the presence of Ca(2+) channels...
September 13, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28900252/profiling-of-the-metabolic-transcriptome-via-single-molecule-molecular-inversion-probes
#5
Tessa de Bitter, Carlijn van de Water, Corina van den Heuvel, Carolien Zeelen, Astrid Eijkelenboom, Bastiaan Tops, Egbert Oosterwijk, Dimitar Kolev, Peter Mulders, Mark Ter Laan, Sanne van Lith, William Leenders
Cancer-specific metabolic alterations are of high interest as therapeutic targets. These alterations vary between tumor types, and to employ metabolic targeting to its fullest potential there is a need for robust methods that identify candidate targetable metabolic pathways in individual cancers. Currently, such methods include (13)C-tracing studies and mass spectrometry/ magnetic resonance spectroscopic imaging. Due to high cost and complexity, such studies are restricted to a research setting. We here present the validation of a novel technique of metabolic profiling, based on multiplex targeted next generation sequencing of RNA with single molecule molecular inversion probes (smMIPs), designed to measure activity of and mutations in genes that encode metabolic enzymes...
September 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28898790/cytotoxicity-and-potential-anti-inflammatory-activity-of-velutin-on-raw-264-7-cell-line-differentiation-implications-in-periodontal-bone-loss
#6
Carlos Brito, Alexander Stavroullakis, Tatiane Oliveira, Anuradha Prakki
OBJECTIVES: Hypoxia-inducible factor-1α (HIF-1α) has been implicated in periodontal tissue inflammation and possibly in osteoclast differentiation, while polyphenols are known to be anti-inflammatory natural compounds that are capable of regulating the NF-κB protein complex pathway. The objective of this study was to investigate cytotoxicity and HIF-1α expression through the NF-κB pathway by polyphenol velutin (Euterpe oleracea Mart.), found in the pulp of acai fruit, during inflammatory RAW 264...
September 2, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28898189/ct-texture-analysis-definitions-applications-biologic-correlates-and-challenges
#7
Meghan G Lubner, Andrew D Smith, Kumar Sandrasegaran, Dushyant V Sahani, Perry J Pickhardt
This review discusses potential oncologic and nononcologic applications of CT texture analysis ( CTTA CT texture analysis ), an emerging area of "radiomics" that extracts, analyzes, and interprets quantitative imaging features. CTTA CT texture analysis allows objective assessment of lesion and organ heterogeneity beyond what is possible with subjective visual interpretation and may reflect information about the tissue microenvironment. CTTA CT texture analysis has shown promise in lesion characterization, such as differentiating benign from malignant or more biologically aggressive lesions...
September 2017: Radiographics: a Review Publication of the Radiological Society of North America, Inc
https://www.readbyqxmd.com/read/28893911/molecular-and-functional-characterization-of-the-endothelial-atp-sensitive-potassium-channel
#8
Qadeer Aziz, Yiwen Li, Naomi Anderson, Leona Ojake, Elena Tsisanova, Andrew Tinker
ATP-sensitive potassium (KATP) channels are widely expressed in the cardiovascular system where they regulate a range of biological activities by linking cellular metabolism with membrane excitability. KATP channels in vascular smooth muscle have a well-defined role in regulating vascular tone. KATP channels are also thought to be expressed in vascular endothelial cells (ECs), but their presence and function in this context is less clear. As a result, we aimed to investigate the molecular composition and physiological role of endothelial KATP channels...
September 11, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28893651/obstructive-sleep-apnea-is-associated-with-altered-midbrain-chemical-concentrations
#9
Paul M Macey, Manoj K Sarma, Janani P Prasad, Jennifer A Ogren, Ravi Aysola, Ronald M Harper, M Albert Thomas
Obstructive sleep apnea (OSA) is accompanied by altered structure and function in cortical, limbic, brainstem, and cerebellar regions. The midbrain is relatively unexamined, but contains many integrative nuclei which mediate physiological functions that are disrupted in OSA. We therefore assessed the chemistry of the midbrain in OSA in this exploratory study. We used a recently-developed accelerated 2D magnetic resonance spectroscopy (2D-MRS) technique, compressed sensing-based 4D echo-planar J-resolved spectroscopic imaging (4D-EP-JRESI), to measure metabolites in the midbrain of 14 OSA (mean age±SD:54...
September 8, 2017: Neuroscience
https://www.readbyqxmd.com/read/28892580/correlation-of-quantitative-parameters-of-magnetic-resonance-perfusion-weighted-imaging-with-vascular-endothelial-growth-factor-microvessel-density-and-hypoxia-inducible-factor-1%C3%AE-in-nasopharyngeal-carcinoma-evaluation-on-radiosensitivity-study
#10
Ying Hu, Hong E, Xiaoping Yu, Feiping Li, Longwu Zeng, Qiang Lu, Xuping Xi, Liangfang Shen
OBJECTIVES: To investigate the correlation of parameters of magnetic resonance perfusion-weighted imaging (MR-PWI) with the expression of vascular endothelial growth factor (VEGF), hypoxia-inducible factor-1α (HIF-1α) and microvessel density (MVD) in nasopharyngeal carcinoma (NPC) so as to explore the value of predicting radiosensitivity. DESIGN: A prospective study. SETTING: Department of Head-and-neck radiotherapy in Hunan Cancer Hospital...
September 11, 2017: Clinical Otolaryngology
https://www.readbyqxmd.com/read/28891933/tyrosine-kinase-inhibitors-therapies-with-mainly-anti-angiogenic-activity-in-advanced-renal-cell-carcinoma-value-of-pet-ct-in-response-evaluation
#11
REVIEW
Girolamo Ranieri, Ilaria Marech, Artor Niccoli Asabella, Alessandra Di Palo, Mariangela Porcelli, Valentina Lavelli, Giuseppe Rubini, Cristina Ferrari, Cosmo Damiano Gadaleta
Renal cell carcinoma (RCC) is the most frequent renal tumor and the majority of patients are diagnosed with advanced disease. Tumor angiogenesis plays a crucial role in the development and progression of RCC together with hypoxia and glucose metabolism. These three pathways are strictly connected to the cell growth and proliferation, like a loop that is self-feeding. Over the last few years, the ever-deeper knowledge of its contribution in metastatic RCC led to the discovery of numerous tyrosine kinase inhibitors (TKIs) targeting pro-angiogenic receptors at different levels such as sunitinib, sorafenib, pazopanib, axitinib, tivozanib, and dovitinib...
September 9, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28891398/geometric-analysis-of-loco-regional-recurrences-in-relation-to-pre-treatment-hypoxia-in-patients-with-head-and-neck-cancer
#12
Simon Boeke, Daniela Thorwarth, David Mönnich, Christina Pfannenberg, Gerald Reischl, Christian La Fougère, Konstantin Nikolaou, Paul-Stefan Mauz, Frank Paulsen, Daniel Zips, Stefan Welz
INTRODUCTION: A previous pattern-of-failure study has suggested that up to 50% of the loco-regional failures (LRF) in head and neck squamous cell carcinoma (HNSCC) occur outside the initial hypoxic volume determined by [(18)F]-fluoromisonidazole-PET ([(18)F]-FMISO-PET). The aim of the present analysis was to correlate spatial patterns of failure with respect to the pretherapeutic dynamic [(18)F]-FMISO-PET/CT in HNSCC after radiochemotherapy (RCT). MATERIAL AND METHODS: Within a running phase 2 trial using [(18)F]-FMISO-PET imaging prior to RCT in HNSCC patients (n = 54), we have observed so far 11 LRF with a minimum follow-up of 12 months...
September 11, 2017: Acta Oncologica
https://www.readbyqxmd.com/read/28886695/cerebral-microvascular-dysfunction-in-metabolic-syndrome-is-exacerbated-by-ischemia-reperfusion-injury
#13
Nathalie Obadia, Marcos Adriano Lessa, Anissa Daliry, Raquel Rangel Silvares, Fabiana Gomes, Eduardo Tibiriçá, Vanessa Estato
BACKGROUND: Metabolic syndrome (MetS) is associated with an increased risk of cerebrovascular diseases, including cerebral ischemia. Microvascular dysfunction is an important feature underlying the pathophysiology of cerebrovascular diseases. In this study, we aimed to investigate the impacts of ischemia and reperfusion (IR) injury on the cerebral microvascular function of rats with high-fat diet-induced MetS. RESULTS: We examined Wistar rats fed a high-fat diet (HFD) or normal diet (CTL) for 20 weeks underwent 30 min of bilateral carotid artery occlusion followed by 1 h of reperfusion (IR) or sham surgery...
September 8, 2017: BMC Neuroscience
https://www.readbyqxmd.com/read/28882674/liposome-accumulation-in-irradiated-tumors-display-important-tumor-and-dose-dependent-differences
#14
Anders Elias Hansen, Frederikke Petrine Fliedner, Jonas Rosager Henriksen, Jesper Tranekjær Jørgensen, Andreas Ettrup Clemmensen, Betina Børresen, Dennis Ringkjøbing Elema, Andreas Kjær, Thomas Lars Andresen
Radiation therapy may affect several important parameters in the tumor microenvironment and thereby influence the accumulation of liposomes by the enhanced permeability and retention (EPR)-effect. Here we investigate the effect of single dose radiation therapy on liposome tumor accumulation by PET/CT imaging using radiolabeled liposomes. Head and neck cancer xenografts (FaDu) and syngenic colorectal (CT26) cancer models were investigated. Radiotherapy displayed opposite effects in the two models. FaDu tumors displayed increased mean accumulation of liposomes for radiation doses up to 10Gy, whereas CT26 tumors displayed a tendency for decreased accumulation...
September 4, 2017: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/28880208/dual-role-of-mir-21-mediated-signaling-in-huvecs-and-rat-surgical-flap-under-normoxia-and-hypoxia-condition
#15
Chih-Hau Chang, Meng-Chi Yen, Ssu-Hui Liao, Yu-Ling Hsu, Chung-Sheng Lai, Yur-Ren Kuo, Ya-Ling Hsu
Restoring sufficient vascularity of the ischemia/hypoxia flap is always the critical issue in flap surgeries. In a previous studies microRNA-21 (miR-21) expression was upregulated after rat skin flap surgery. MiR-21 has been reported to be induced by hypoxia and the function of miR-21 involves in the process of angiogenesis. However, the precise regulatory mechanisms in miR-21-mediated pathways are still unclear. These issues were investigated via in vitro and in vivo experiments in this study. In human umbilical vein endothelial cells (HUVEC), the expression of hsa-miR-21-5p was induced after hypoxic culture and the induction of hsa-miR-21-5p was suppressed after sequential normoxic culture...
September 7, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28878307/a-method-for-combined-retinal-vascular-and-tissue-oxygen-tension-imaging
#16
Anthony E Felder, Justin Wanek, Michael R Tan, Norman P Blair, Mahnaz Shahidi
The retina requires adequate oxygenation to maintain cellular metabolism and visual function. Inner retinal oxygen metabolism is directly related to retinal vascular oxygen tension (PO2) and inner retinal oxygen extraction fraction (OEF), whereas outer retinal oxygen consumption (QO2) relies on oxygen availability by the choroid and is contingent upon retinal tissue oxygen tension (tPO2) gradients across the retinal depth. Thus far, these oxygenation and metabolic parameters have been measured independently by different techniques in separate animals, precluding a comprehensive and correlative assessment of retinal oxygenation and metabolism dynamics...
September 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28878103/multimodality-imaging-of-anomalous-origin-of-right-coronary-artery-from-pulmonary-artery-arcapa
#17
Sanjay S Mehta, Srinivasan Sattiraju
Computed tomography angiogram confirmed the anomalous right coronary artery from pulmonary artery (ARCAPA) in a patient who presented with altered mental status and hypoxia due to opiate drug abuse. ARCAPA is exceedingly rare, with reported incidence of 0.002% in the literature. We present clinical images and describe the case management.
September 2017: Journal of Invasive Cardiology
https://www.readbyqxmd.com/read/28877734/local-relapse-of-nasopharyngeal-cancer-and-voxel-based-analysis-of-fmiso-uptake-using-pet-with-semiconductor-detectors
#18
Yukiko Nishikawa, Koichi Yasuda, Shozo Okamoto, Yoichi M Ito, Rikiya Onimaru, Tohru Shiga, Kazuhiko Tsuchiya, Shiro Watanabe, Wataru Takeuchi, Yuji Kuge, Hao Peng, Nagara Tamaki, Hiroki Shirato
BACKGROUND: Hypoxic cancer cells are thought to be radioresistant and could impact local recurrence after radiotherapy (RT). One of the major hypoxic imaging modalities is [(18)F]fluoromisonidazole positron emission tomography (FMISO-PET). High FMISO uptake before RT could indicate radioresistant sites and might be associated with future local recurrence. The predictive value of FMISO-PET for intra-tumoral recurrence regions was evaluated using high-resolution semiconductor detectors in patients with nasopharyngeal carcinoma after intensity-modulated radiotherapy (IMRT)...
September 6, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28877521/case-report-pulmonary-tumor-thrombotic-microangiopathy-in-a-cervical-cancer-patient
#19
Naoya Tsujimoto, Ai Miyoshi, Mayuko Mimura, Toshio Naka, Masaru Yamasaki, Takeshi Yokoi
Pulmonary tumor thrombotic microangiopathy (PTTM) is a rapidly progressive and often fatal pulmonary disease induced by tumor emboli within the small pulmonary arteries. PTTM presents clinically as progressive hypoxia and pulmonary hypertension. Most cases of PTTM are caused by an adenocarcinoma of the stomach. We present the first case report of PTTM caused by cervical squamous cell carcinoma. An 82-year-old woman presented with vaginal bleeding and exertional dyspnea. A cervical mass biopsy showed squamous cell carcinoma...
September 7, 2017: Gynecologic and Obstetric Investigation
https://www.readbyqxmd.com/read/28871880/clinical-factors-associated-with-chest-imaging-findings-in-hospitalized-infants-with-bronchiolitis
#20
Joanne M Nazif, Benjamin H Taragin, Gabriella Azzarone, Michael L Rinke, Sheila Liewehr, Jaeun Choi, Nora Esteban-Cruciani
Despite recommendations against routine imaging, chest radiography (CXR) is frequently performed on infants hospitalized for bronchiolitis. We conducted a review of 811 infants hospitalized for bronchiolitis to identify clinical factors associated with imaging findings. CXR was performed on 553 (68%) infants either on presentation or during hospitalization; 466 readings (84%) were normal or consistent with viral illness. Clinical factors significantly associated with normal/viral imaging were normal temperature (odds ratio = 1...
October 2017: Clinical Pediatrics
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