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https://www.readbyqxmd.com/read/28319664/reduction-of-folate-by-dihydrofolate-reductase-from-thermotoga-maritima
#1
E Joel Loveridge, Lukas Hroch, Robert L Hughes, Thomas Williams, Rhidian L Davies, Antonio Angelastro, Louis Y P Luk, Giovanni Maglia, Rudolf K Allemann
Mammalian dihydrofolate reductases (DHFR) catalyse the reduction of folate more efficiently than the equivalent bacterial enzymes, despite typically having similar efficiencies for the reduction of their natural substrate dihydrofolate. In contrast, we show here that DHFR from the hyperthermophilic bacterium Thermotoga maritima is able to catalyse reduction of folate to tetrahydrofolate with a similar efficiency to reduction of dihydrofolate under saturating conditions. NMR and mass spectrometry experiments showed no evidence for production of free dihydrofolate during either the EcDHFR- or TmDHFR-catalysed reductions of folate, suggesting that both enzymes perform the two reduction steps without release of the partially reduced substrate...
March 20, 2017: Biochemistry
https://www.readbyqxmd.com/read/28318956/carotid-endarterectomy-to-remove-retained-solitaire-stent-retriever-inside-carotid-stent-after-mechanical-thrombectomy
#2
Mary In-Ping Huang Cobb, Tony P Smith, Patrick A Brown, L Fernando Gonzalez, Ali R Zomorodi
BACKGROUND: Tandem occlusions of the internal carotid artery (ICA) and middle cerebral artery (MCA) occur in up to a third of patients with acute ischemic strokes undergoing endovascular mechanical thrombectomy. Understanding open neurosurgical management of associated complications with this procedure is important. CASE REPORT: A 67-year-old man with acute onset of left hemiparesis and a tandem right ICA and MCA occlusion. He underwent carotid stent angioplasty of a stenotic ICA, followed by attempted Solitaire stent retrieval of an MCA clot...
March 16, 2017: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/28318037/deoxycytidine-and-deoxythymidine-treatment-for-thymidine-kinase-2-deficiency
#3
Carlos Lopez-Gomez, Rebecca J Levy, Maria J Sanchez-Quintero, Marti Juanola-Falgarona, Emanuele Barca, Beatriz Garcia-Diaz, Saba Tadesse, Caterina Garone, Michio Hirano
OBJECTIVE: Thymidine kinase 2 (TK2), a critical enzyme in the mitochondrial pyrimidine salvage pathway, is essential for mitochondrial DNA (mtDNA) maintenance. Mutations in the nuclear gene TK2 cause TK2 deficiency, which manifests predominantly in children as myopathy with mtDNA depletion. Molecular bypass therapy with the TK2 products, dCMP and dTMP, prolongs the lifespan of Tk2-deficient (Tk2(-/-) ) mice by 2-3 fold. Because we observed rapid catabolism of the deoxynucleoside monophosphates to deoxythymidine (dT) and deoxycytidine (dC), we hypothesized that: 1) deoxynucleosides might be the major active agents and 2) inhibition of deoxycytidine deamination might enhance dTMP+dCMP therapy...
March 20, 2017: Annals of Neurology
https://www.readbyqxmd.com/read/28317152/-68-ga-psma-pet-for-radiation-treatment-planning-in-prostate-cancer-recurrences-after-surgery-individualized-medicine-or-new-standard-in-salvage-treatment
#4
Gregor Habl, Katharina Sauter, Kilian Schiller, Sabrina Dewes, Tobias Maurer, Matthias Eiber, Stephanie E Combs
BACKGROUND: (68) Ga-PSMA-PET imaging is a novel promising diagnostic tool to locate early biochemical failure after radical prostatectomy (RP) in prostate cancer (PC) patients. Exact knowledge of the relapse location may result in changes of the therapy concept aside from changes to the TNM stage. To gain data for this approach, we evaluated PC patients receiving (68) Ga-PSMA-PET imaging before salvage radiotherapy (RT). METHODS AND MATERIALS: In this study, 100 patients with biochemical failure after RP± prior RT who underwent (68) Ga-PSMA PET/CT or PET/MRI were evaluated undergoing salvage RT in our department...
March 20, 2017: Prostate
https://www.readbyqxmd.com/read/28316212/-evaluation-and-classification-of-drug-therapy-for-breast-cancer-with-bone-only-metastasis
#5
X Y Meng, S T Song
Skeleton is one of the most common metastatic organs for breast cancer, which has a better prognosis than visceral metastases. Bone-only metastasis was defined"non-measurable" in the RECIST (Response Evaluation Criteria in Solid Tumors) criteria, and was excluded by clinical trials. However, patients with bone-only metastasis are also in need of effective treatment to prolong survival. Endocrine therapy is the most important treatment for bone metastatic patients. Tumor response of bone metastases can be determined objectively by bone-window CT...
March 23, 2017: Zhonghua Zhong Liu za Zhi [Chinese Journal of Oncology]
https://www.readbyqxmd.com/read/28316073/arrhythmic-effects-of-epac-mediated-ryanodine-receptor-activation-in-langendorff-perfused-murine-hearts-are-associated-with-reduced-conduction-velocity
#6
Mengye Li, Sandeep Hothi, Samantha C Salvage, Kamalan Jeevaratnam, Andrew A Grace, Christopher L-H Huang
Recent papers have attributed arrhythmic substrate in murine RyR2-P2328S hearts to reduced action potential (AP) conduction velocities (CV), reflecting acute functional inhibition and/or reduced expression of sodium channels. We explored for acute effects of direct Epac (exchange protein directly activated by cAMP)-mediated ryanodine receptor-2 (RyR2) activation on arrhythmic substrate and CV. Monophasic action potential recordings demonstrated that initial steady (8-Hz) extrinsic pacing elicited ventricular tachycardia (VT) in 0 of 18 Langendorff-perfused wild-type mouse ventricles before pharmacological intervention...
March 18, 2017: Clinical and Experimental Pharmacology & Physiology
https://www.readbyqxmd.com/read/28315510/policies-for-reirradiation-of-recurrent-high-grade-gliomas-a-survey-among-italian-radiation-oncologists
#7
Carlo Furlan, Stefano Arcangeli, Michele Avanzo, Maria A Mirri, Fernando Munoz, Stefania Giudici, Antonio Perrone, Dante Amelio, Luigi Tomio, Loredana Draghini, Aniko M Deli, Giovanni Pavanato, Francesca M Giuliano, Antonio Pontoriero, Patrizia Ciammella, Pierina Navarria, Alberto Iannalfi, Michela Buglione, Cesare Guida, Silvia Cammelli, Vincenzo Iorio, Massimo Cardinali, Domenico Genovesi, Lucia Barsacchi, Mario Balducci, Rita Bagnoli, Franco Berti, Giampaolo Montesi, Francesco Pasqualetti, Paolo Bonome, Riccardo Santoni, Daniela Doino, Patrizia Schirru, Valentina Pinzi, Valentina Borzillo, Fabio Ferrarese, Marica Ferro, Luigi De Cicco, Marco Krengli, Silvia Scoccianti, Vittorio Donato
PURPOSE: To assess the contribution of Italian radiation oncologists in the current management of recurrent high-grade gliomas (HGG), focusing on a reirradiation (reRT) approach. METHODS: In 2015, the Reirradiation and the Central Nervous System Study Groups on behalf of the Italian Association of Radiation Oncology (AIRO) proposed a survey. All Italian radiation oncologists were individually invited to complete an online questionnaire regarding their clinical management of recurrent HGG, focusing on a reRT approach...
March 18, 2017: Tumori
https://www.readbyqxmd.com/read/28314971/-when-is-surgical-treatment-indicated-in-metastatic-prostate-cancer-and-what-is-the-scientific-rationale
#8
A Kretschmer, A Herlemann, C G Stief, C Gratzke
BACKGROUND: Recent improvements in imaging diagnostics has led to a rising incidence of oligometastatic prostate cancer and, most notably, an increasing incidence of nodal-only biochemical recurrences. In this clinical setting, systemic therapy is still the treatment of choice. However, there is increasing evidence for surgical approaches in this challenging clinical setting. AIM OF THE STUDY: In this comprehensive review article, current evidence regarding surgical approaches of primary nodal metastases, nodal-only biochemical recurrence following radical prostatectomy, and osseous metastatic prostate cancer will be discussed...
March 17, 2017: Der Urologe. Ausg. A
https://www.readbyqxmd.com/read/28304190/the-second-generation-eclips-endovascular-clip-system-initial-experience
#9
Albert H Chiu, Joost De Vries, Cian J O'Kelly, Howard Riina, Ian McDougall, Jonathan Tippett, Martina Wan, Airton Leonardo de Oliveira Manoel, Thomas R Marotta
OBJECTIVE Treatment of wide-necked intracranial aneurysms is associated with higher recanalization and complication rates; however, the most commonly used methods are not specifically designed to work in bifurcation lesions. To address these issues, the authors describe the evolution in the design and use of the eCLIPs (Endovascular Clip System) device, a novel hybrid stent-like assist device with flow diverter properties that was first described in 2008. METHODS A registry was established covering 13 international centers at which patients were treated with the second-generation eCLIPs device...
March 17, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28304150/additional-chemotherapy-and-salvage-surgery-for-poor-response-to-chemoradiotherapy-in-rectal-cancers
#10
Reena Engineer, Vikas Ostwal, Supreeta Arya, Priyamvada Gupta, Supriya Chopra, Prachi Patil, Sudhir Jatal, Avanish Saklani
AIM: A proportion of locally advanced rectal cancer patients who receive neoadjuvant chemoradiotherapy (NACRT) are still unresectable. This study was undertaken to assess the outcomes of giving additional chemotherapy to rectal cancer patients with unresectable disease after NACRT. METHODS: Patients with poor response to NACRT where mesorectal fascia was still involved on MRI and R0 resection was doubtful, received additional four cycles of chemotherapy with either CAPOX or FOLFIRINOX regimen, and the response was reevaluated with MRI and reassessed for surgical resection...
March 17, 2017: Asia-Pacific Journal of Clinical Oncology
https://www.readbyqxmd.com/read/28302592/spectral-detector-ct-for-cardiovascular-applications
#11
Prabhakar Rajiah, Suhny Abbara, Sandra Simon Halliburton
Spectral detector computed tomography (SDCT) is a novel technology that uses two layers of detectors to simultaneously collect low and high energy data. Spectral data is used to generate conventional polyenergetic images as well as dedicated spectral images including virtual monoenergetic and material composition (iodine-only, virtual unenhanced, effective atomic number) images. This paper provides an overview of SDCT technology and a description of some spectral image types. The potential utility of SDCT for cardiovascular imaging and the impact of this new technology on radiation and contrast dose are discussed through presentation of initial patient studies performed on a SDCT scanner...
March 17, 2017: Diagnostic and Interventional Radiology: Official Journal of the Turkish Society of Radiology
https://www.readbyqxmd.com/read/28301348/discord-among-radiation-oncologists-and-urologists-in-the-postoperative-management-of-high-risk-prostate-cancer
#12
Amar U Kishan, Gillian Duchesne, Pin-Chieh Wang, Jean-Claude M Rwigema, Arun U Kishan, Christopher Saigal, Matthew Rettig, Michael L Steinberg, Christopher R King
OBJECTIVE: To query specialty-specific differences regarding postoperative radiotherapy (RT) for high-risk prostate cancer. MATERIALS AND METHODS: Electronic mail survey of radiation oncologists (ROs) and urologists. We sought to maximize absolute response number to capture contemporary practice ethos. The outcome of interest was association between response and specialty. Training level/expertise, practice setting, percentage of consultation caseload consisting of high-risk prostate cancer, and nationality were set as effect modifiers for multivariate logistic regression...
March 15, 2017: American Journal of Clinical Oncology
https://www.readbyqxmd.com/read/28300441/orthovoltage-x-rays-for-postoperative-treatment-of-resected-basal-cell-carcinoma-in-the-head-and-neck-area
#13
Charlotte W Duinkerken, Peter J F M Lohuis, Marianne B Crijns, Arash Navran, Rick L M Haas, Olga Hamming-Vrieze, W Martin C Klop, Michiel W M van den Brekel, Abrahim Al-Mamgani
BACKGROUND: Surgery is the golden standard for treating basal cell carcinomas. In case of positive tumor margins or recurrent disease, postoperative adjuvant or salvaging therapy is suggested to achieve good local control. OBJECTIVE: To retrospectively report on local control and toxicity of postoperative radiotherapy by means of orthovoltage X-rays for residual or recurrent basal cell carcinoma after surgery in the head and neck area. METHODS: Sixty-six surgically resected residual or recurrent basal cell carcinomas of the head and neck region were irradiated postoperatively by means of orthovoltage X-rays at the Netherlands Cancer Institute between January 2000 and February 2015...
December 1, 2016: Journal of Cutaneous Medicine and Surgery
https://www.readbyqxmd.com/read/28299264/clinical-outcome-of-surgical-treatment-of-t1-2-n0-squamous-cell-carcinoma-of-oral-tongue-with-observation-for-the-neck-analysis-of-176-cases
#14
Arsheed Hussain Hakeem, Sultan Ahmed Pradhan, Rajan Kannan, Jagadish Tubachi
OBJECTIVE: To analyze various demographic, clinical, and histopathologic factors in T1-2 N0 squamous cell carcinoma (SCC) of the oral tongue to define a high-risk group for regional recurrence that will benefit from elective neck dissection. MATERIALS AND METHODS: Retrospective outcome analysis of a patient cohort without palpable or ultrasound (USG) detectable nodal metastases undergoing per oral wide glossectomy for T1-2 N0 SCC of oral tongue. Patients were followed up using palpation and serial USG neck and fine-needle aspiration cytology...
July 2016: Annals of Maxillofacial Surgery
https://www.readbyqxmd.com/read/28298023/alternating-electric-tumor-treating-fields-for-treatment-of-glioblastoma-rationale-preclinical-and-clinical-studies
#15
Sandeep Mittal, Neil V Klinger, Sharon K Michelhaugh, Geoffrey R Barger, Susan C Pannullo, Csaba Juhász
OBJECTIVE Treatment for glioblastoma (GBM) remains largely unsuccessful, even with aggressive combined treatment via surgery, radiotherapy, and chemotherapy. Tumor treating fields (TTFs) are low-intensity, intermediate-frequency, alternating electric fields that have antiproliferative properties in vitro and in vivo. The authors provide an up-to-date review of the mechanism of action as well as preclinical and clinical data on TTFs. METHODS A systematic review of the literature was performed using the terms "tumor treating fields," "alternating electric fields," "glioblastoma," "Optune," "NovoTTF-100A," and "Novocure...
February 24, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28296715/evaluating-the-use-of-tissue-oximetry-to-decrease-intensive-unit-monitoring-for-free-flap-breast-reconstruction
#16
Joseph A Ricci, Christina R Vargas, Olivia A Ho, Samuel J Lin, Adam M Tobias, Bernard T Lee
BACKGROUND: Postoperative free flap care has historically required intensive monitoring for 24 hours in an intensive care unit. Continuous monitoring with tissue oximetry has allowed earlier detection of vascular compromise, decreasing flap loss and improving salvage. This study aims to identify whether a fast-track postoperative paradigm can be safely used with tissue oximetry to decrease intensive monitoring and costs. MATERIALS AND METHODS: All consecutive microsurgical breast reconstructions performed at a single institution were reviewed (2008-2014) and cases requiring return to the operating room were identified...
March 14, 2017: Annals of Plastic Surgery
https://www.readbyqxmd.com/read/28296712/association-between-the-use-of-surveillance-pet-ct-and-the-detection-of-potentially-salvageable-occult-recurrences-among-patients-with-resected-high-risk-melanoma
#17
Roberto A Leon-Ferre, Lisa A Kottschade, Matthew S Block, Robert R McWilliams, Roxana S Dronca, Edward T Creagan, Jacob B Allred, Val J Lowe, Svetomir N Markovic
The optimal surveillance for patients with resected high-risk melanoma is controversial. Select locoregional or oligometastatic recurrences can be cured with salvage resection. Data on the ability of PET/CT to detect such recurrences are sparse. We evaluated whether surveillance PET/CT in patients with resected stage III-IV melanoma led to detection of clinically occult recurrences amenable to curative-intent salvage treatment. We retrospectively identified 1429 melanoma patients who underwent PET/CT between January 2008 and October 2012 at Mayo Clinic (Rochester, Minnesota)...
March 14, 2017: Melanoma Research
https://www.readbyqxmd.com/read/28296244/-watchful-observation-follow-up-scheme-after-endoscopic-co2-laser-treatment-for-small-glottic-carcinomas-a-retrospective-study-of-93-cases
#18
Patrice Gallet, Cécile Rumeau, Duc Trung Nguyen, Pedro Augusto Teixeira, Cédric Baumann, Bruno Toussaint
OBJECTIVES: Evaluate the clinical outcome of patients treated with CO2-laser surgery for early-stage glottic carcinomas followed-up with 3 month laryngoscopy regardless of tumor grade and margins. DESIGN: Case series. SETTING: Retrospective review of the clinical records of patients treated at the ENT department of a tertiary university hospital. PARTICIPANTS AND METHOD: Clinical records from patients with early-stage glottic carcinomas (Tis-T2) treated with curative intent by CO2-laser surgery in a ten year period were evaluated...
March 10, 2017: Clinical Otolaryngology
https://www.readbyqxmd.com/read/28296171/calcium-dependent-nedd4-2-upregulation-mediates-degradation-of-the-cardiac-sodium-channel-nav1-5-implications-for-heart-failure
#19
Ling Luo, Feifei Ning, Yuan Du, Bingxue Song, Dandan Yang, Samantha C Salvage, Ya Wang, James A Fraser, Shetuan Zhang, Aiqun Ma, Tingzhong Wang
AIM: Reductions of voltage-gated sodium channel (Nav1.5) function/expression provide a slowed-conduction substrate for cardiac arrhythmias. Nedd4-2, which is activated by calcium, post-translationally modulates Nav1.5. We aim to investigate whether elevated intracellular calcium ([Ca(2+) ]i ) reduces Nav1.5 through Nedd4-2 and its role in heart failure (HF). METHODS: Using a combination of biochemical, electrophysiological, cellular and in vivo methods, we tested the effect and mechanism of calcium on Nedd4-2 and in turn Nav1...
March 10, 2017: Acta Physiologica
https://www.readbyqxmd.com/read/28296034/emergency-valve-in-valve-transcatheter-aortic-valve-replacement-in-a-patient-with-degenerated-bioprosthetic-aortic-stenosis-and-cardiogenic-shock-on-veno-arterial-extracorporeal-membrane-oxygenation
#20
Matthew R Summers, Stephanie Mick, Samir R Kapadia, Amar Krishnaswamy
The use of transcatheter aortic valve replacement (TAVR) as an acute treatment in severe decompensated bioprosthetic aortic valve disease is not well documented. We describe herein a unique case in which valve-in-valve (ViV) TAVR was successfully used as both an emergency salvage therapy and a bridge to definitive fourth reoperative aortic valve replacement (AVR) in a young patient with cardiogenic shock secondary to bioprosthetic aortic valve stenosis who was dependent on veno-arterial extracorporeal membrane oxygenation (VA-ECMO)...
March 15, 2017: Catheterization and Cardiovascular Interventions
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