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https://www.readbyqxmd.com/read/28445365/improvement-of-flap-necrosis-in-a-rat-random-skin-flap-model-by-in-vivo-electroporation-mediated-hgf-gene-transfer
#1
S Morteza Seyed Jafari, Maziar Shafighi, Helmut Beltraminelli, Thomas Geiser, Robert E Hunger, Amiq Gazdhar
BACKGROUND: Despite great understanding of underlying mechanisms for flap necrosis and advances in surgical techniques, flap necrosis remains a critical issue. In the present study, the authors investigated the efficacy of electroporation-mediated hepatocyte growth factor (HGF) gene delivery to random dorsal skin flaps (McFarlane) to accelerate wound healing and reduce flap necrosis. METHODS: Fifteen male Wistar rats (290 to 320 g) were divided randomly into three groups...
May 2017: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28444128/low-dose-ionizing-radiation-induces-therapeutic-neovascularization-in-a-pre-clinical-model-of-hindlimb-ischemia
#2
Augusto Ministro, Paula de Oliveira, Raquel J Nunes, André Dos Santos Rocha, Adriana Correia, Tânia Carvalho, José Rino, Pedro Faísca, Jorg D Becker, J Goyri-O'Neill, Filomena Pina, Esmeralda Poli, Bruno Silva-Santos, Fausto Pinto, Marc Mareel, Karine Serre, Susana Constantino Rosa Santos
We have previously shown that low-dose ionizing radiation (LDIR) induces angiogenesis but there is no evidence that they induce neovascularization in the setting of peripheral arterial disease. Here, we investigated the use of LDIR as an innovative and non-invasive strategy to stimulate therapeutic neovascularization using a model of experimentally induced hindlimb ischemia (HLI). Methods and results: After surgical induction of unilateral HLI, both hindlimbs of female C57BL/6 mice were sham-irradiated or irradiated with four daily fractions of 0...
April 19, 2017: Cardiovascular Research
https://www.readbyqxmd.com/read/28440002/differential-effect-of-incobotulinumtoxin-a-on-pain-neurogenic-flare-and-hyperalgesia-in-human-surrogate-models-of-neurogenic-pain
#3
S A Diener, M Breimhorst, Th Vogt, H H Krämer, P D Drummond, C Geber, F Birklein
BACKGROUND: The effectiveness of Botulinum-neurotoxin A (BoNT/A) to treat pain in human pain models is very divergent. This study was conducted to clarify if the pain models or the route of BoNT/A application might be responsible for these divergent findings. METHODS: Sixteen healthy subjects (8 males, mean age 27 ± 5 years) were included in a first set of experiments consisting of three visits: (1) Visit: Quantitative sensory testing (QST) was performed before and after intradermal capsaicin injection (CAPS, 15 μg) on one thigh and electrical current stimulation (ES, 1 Hz) on the contralateral thigh...
April 25, 2017: European Journal of Pain: EJP
https://www.readbyqxmd.com/read/28438762/etb-receptor-contribution-to-vascular-dysfunction-in-postmenopausal-women
#4
Megan M Wenner, Kelly N Sebzda, Andrew V Kuczmarski, Ryan T Pohlig, David G Edwards
Endothelin-1 (ET-1) contributes to age-related endothelial dysfunction in men via the ETA receptor. However, there are sex differences in the ET-1 system, and ETB receptors are modulated by sex hormones. The purpose of this study was to test the hypothesis that ETB receptors contribute to impaired vasodilatory function in postmenopausal women (PMW). We measured flow-mediated dilation (FMD) using ultrasound, and cutaneous nitric oxide-mediated vasodilation during local heating (42°C) via laser Doppler flowmetry in 18 young (YW; 22±1 years) and 16 PMW (56±1 years)...
April 24, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/28436705/pharmacologically-increasing-collateral-perfusion-during-acute-stroke-using-a-carboxyhemoglobin-gas-transfer-agent-sanguinate%C3%A2-in-spontaneously-hypertensive-rats
#5
Marilyn J Cipolla, Italo Linfante, Abe Abuchowski, Ronald Jubin, Siu-Lung Chan
Similar to patients with chronic hypertension, spontaneously hypertensive rats (SHR) develop fast core progression during middle cerebral artery occlusion (MCAO) resulting in large final infarct volumes. We investigated the effect of Sanguinate™ (SG), a PEGylated carboxyhemoglobin (COHb) gas transfer agent, on changes in collateral and reperfusion cerebral blood flow and brain injury in SHR during 2 h of MCAO. SG (8 mL/kg) or vehicle ( n = 6-8/group) was infused i.v. after 30 or 90 min of ischemia with 2 h reperfusion...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28435084/optimization-of-behavioural-tests-for-the-prediction-of-outcomes-in-mouse-models-of-focal-middle-cerebral-artery-occlusion
#6
Zhuoyu Wen, Xiaomeng Xu, Lili Xu, Lian Yang, Xiaohui Xu, Juehu A Zhu, Li Wu, Yongjun Jiang, Xinfeng Liu
Intraluminal middle cerebral artery occlusion (MCAO) is the most widely used model of stroke. We aimed to predict the outcome of MCAO using a combination of fine behavioural tests for the prediction of unsuccessful surgery in mice leading to no infarction, haemorrhage and unexpected death. MCAO was performed on adult mice under the guidance of laser-Doppler flowmetry (LDF) to warrant a decrease in regional cerebral blood flow (rCBF) in the MCA territory. Four outcomes of MCAO were defined according to histological analysis: infarction, no infarction, haemorrhage and unexpected death (death within 24 h post-surgery)...
April 20, 2017: Brain Research
https://www.readbyqxmd.com/read/28430305/turbulence-measurements-in-an-axial-rotary-blood-pump-with-laser-doppler-velocimetry
#7
Chan Y Schüle, Klaus Affeld, Max Kossatz, Christian O Paschereit, Ulrich Kertzscher
BACKGROUND: The implantation of rotary blood pumps as ventricular assist devices (VADs) has become a viable therapy for quite a number of patients with end-stage heart failure. However, these rotary blood pumps cause adverse events that are related to blood trauma. It is currently believed that turbulence in the pump flow plays a significant role. But turbulence has not been measured to date because there is no optical access to the flow space in rotary blood pumps because of their opaque casings...
April 18, 2017: International Journal of Artificial Organs
https://www.readbyqxmd.com/read/28429082/the-effect-of-a-combined-thoracic-and-soft-tissue-trauma-on-blood-flow-and-tissue-formation-in-fracture-healing-in-rats
#8
Lutz Claes, Florian Gebhard, Anita Ignatius, Raimund Lechner, Stefan Baumgärtel, Michael Kraus, Gert D Krischak
INTRODUCTION: Previously, it was found that fracture healing is impaired by blunt chest trauma and an additional soft-tissue trauma. The mechanisms leading to this disturbance are largely unknown. Here, we investigated the effect of thoracic and soft-tissue trauma on blood flow of the injured lower leg and on tissue differentiation and callus formation during fracture healing. MATERIALS AND METHODS: Male Wistar rats received either a mid-shaft fracture of the tibia alone (group A), an additional chest trauma (group B), or additional chest and soft-tissue traumas (group C)...
April 20, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28427990/neuropeptide-y-not-involved-in-cutaneous-vascular-control-in-young-human-females-taking-oral-contraceptive-hormones
#9
Gary J Hodges, Zachary T Martin, Andrew T Del Pozzi
We previously reported that the cutaneous vasodilator response to local warming in males required noradrenaline (NA) and neuropeptide-Y (NPY). Animal work has shown no role for NPY in female vascular control. We investigated the contribution of NA and NPY in human female cutaneous vascular control. Nine female and nine male participants volunteered. To elucidate whether synthetic oestrogen and progesterone altered cutaneous vascular responses, females were tested in high-hormone (HH) and low-hormone (LH) phases of oral contraceptive pill (OCP)...
April 18, 2017: Microvascular Research
https://www.readbyqxmd.com/read/28426903/the-therapeutic-efficacy-of-botulinum-toxin-in-treating-scleroderma-associated-raynaud-s-phenomenon-a-randomized-double-blind-placebo-controlled-clinical-trial-assessing
#10
Ricardo J Bello, Carisa M Cooney, Eitan Melamed, Keith Follmar, Gayane Yenokyan, Gwendolyn Leatherman, Ami A Shah, Fredrick M Wigley, Laura K Hummers, Scott D Lifchez
Objective To assess the therapeutic efficacy of local injections with Botulinum Toxin Type-A (Btx-A) in improving blood flow to the hands of patients with Raynaud's Phenomenon (RP) secondary to scleroderma. Methods In this randomized, double-blind, placebo-controlled clinical trial (http://ClinicalTrials.gov #NCT02165111), patients with scleroderma-associated RP received Btx-A (50 units in 2.5 mL) in one randomly selected hand and sterile saline (2.5 mL) in the opposite hand. Follow-up at 1 and 4 months post-injection included Laser Doppler Imaging (LDI) of hands, patient-reported outcomes, and physical exam...
April 20, 2017: Arthritis & Rheumatology
https://www.readbyqxmd.com/read/28422819/gnaq-tt-695-694-gc-polymorphism-is-associated-with-increased-gq-expression-vascular-reactivity-and-myocardial-injury-after-coronary-artery-bypass-surgery
#11
Ulrich H Frey, Stefanie Klenke, Anna Mitchell, Tim Knüfermann, Heinz Jakob, Matthias Thielmann, Winfried Siffert, Jürgen Peters
BACKGROUND: Angiotensin II receptor type 1-mediated activation of the α-subunit of the heterotrimeric Gq protein evokes increased vasoconstriction and may promote hypertrophy-induced myocardial damage. The authors recently identified a TT(-695/-694)GC polymorphism in the human Gq promoter, the GC allele being associated with an increased prevalence of cardiac hypertrophy. In this article, the authors tested whether the TT(-695/-694)GC polymorphism is associated with differences in (1) myocardial Gq protein expression, (2) vascular reactivity, and (3) myocardial damage after coronary artery bypass grafting...
April 19, 2017: Anesthesiology
https://www.readbyqxmd.com/read/28419229/non-invasive-assessment-of-cerebral-oxygen-metabolism-following-surgery-of-congenital-heart-disease
#12
Felix Neunhoeffer, Katharina Sandner, Milena Wiest, Christoph Haller, Hanna Renk, Matthias Kumpf, Christian Schlensak, Michael Hofbeck
OBJECTIVES: Cerebral protection is a major issue in the treatment of infants with complex congenital heart disease. We tested a new device combining tissue spectrometry and laser Doppler flowmetry for non-invasive determination of cerebral oxygen metabolism following cardiac surgery in infants. METHODS: We prospectively measured regional cerebral oxygen saturation cSO 2 and microperfusion (rcFlow) in 43 infants 12-24 h following corrective ( n  = 30) or palliative surgery ( n  = 13) of congenital heart defects...
April 16, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/28419120/structural-and-functional-changes-in-the-microcirculation-of-lepromatous-leprosy-patients-observation-using-orthogonal-polarization-spectral-imaging-and-laser-doppler-flowmetry-iontophoresis
#13
Curt Treu, Maria das Graças Coelho de Souza, Omar Lupi, Fernando Lencastre Sicuro, Priscila Alves Maranhão, Luiz Guilherme Kraemer-Aguiar, Eliete Bouskela
Leprosy is a chronic granulomatous infection of skin and peripheral nerves caused by Mycobacterium leprae and is considered the main infectious cause of disability worldwide. Despite the several studies regarding leprosy, little is known about its effects on microvascular structure and function in vivo. Thus, we have aimed to compare skin capillary structure and functional density, cutaneous vasomotion (spontaneous oscillations of arteriolar diameter), which ensures optimal blood flow distribution to skin capillaries) and cutaneous microvascular blood flow and reactivity between ten men with lepromatous leprosy (without any other comorbidity) and ten age- and gender-matched healthy controls...
2017: PloS One
https://www.readbyqxmd.com/read/28417947/pro-angiogenic-effects-of-low-dose-ethoxidine-in-a-murine-model-of-ischemic-hindlimb-correlation-between-ethoxidine-levels-and-increased-activation-of-the-nitric-oxide-pathway
#14
Nicolas Clere, Kim Hung Thien To, Samuel Legeay, Samuel Bertrand, Jean Jacques Helesbeux, Olivier Duval, Sébastien Faure
Ethoxidine, a benzo[c]phenanthridine derivative, has been identified as a potent inhibitor of topoisomerase I in cancer cell lines. Our group has reported paradoxical properties of ethoxidine in cellular processes leading to angiogenesis on endothelial cells. Because low concentration ethoxidine is able to favor angiogenesis, the present study aimed to investigate the ability of 10(-9) M ethoxidine to modulate neovascularization in a model of mouse hindlimb ischemia. After inducing unilateral hindlimb ischemia, mice were treated for 21 days with glucose 5% or with ethoxidine, to reach plasma concentrations equivalent to 10(-9) M...
April 12, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28411476/trimethyl-chitosan-capped-silver-nanoparticles-with-positive-surface-charge-their-catalytic-activity-and-antibacterial-spectrum-including-multidrug-resistant-strains-of-acinetobacter-baumannii
#15
T Y Chang, C C Chen, K M Cheng, C Y Chin, Y H Chen, X A Chen, J R Sun, J J Young, T S Chiueh
We report a facile route for the green synthesis of trimethyl chitosan nitrate-capped silver nanoparticles (TMCN-AgNPs) with positive surface charge. In this synthesis, silver nitrate, glucose, and trimethyl chitosan nitrate (TMCN) were used as silver precursor, reducing agent, and stabilizer, respectively. The reaction was carried out in a stirred basic aqueous medium at room temperature without the use of energy-consuming or expensive equipment. We investigated the effects of the concentrations of NaOH, glucose, and TMCN on the particle size, zeta potential, and formation yield...
April 1, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28410842/evidence-of-impaired-microvascular-dilatation-in-preterms-with-acute-respiratory-distress-syndrome
#16
Stefania Troiani, Andrea Cardona, Maddalena Milioni, Debora Monacelli, Alberto Verrotti, Marta Gehring, Giuseppe Ambrosio
BACKGROUND: Evaluating microcirculatory function in severely ill neonates is a relevant, unmet clinical need. Inappropriate peripheral microvascular vasodilatation is thought to contribute to cardiovascular alterations in preterm infants with acute respiratory distress syndrome (ARDS). We directly evaluated microcirculatory function in preterms with ARDS. METHODS: Peripheral microvascular function was assessed in 50 newborns, divided in three groups: preterms with ARDS; at-term newborns with mild-moderate congenital cardiac disease (Cardio group); healthy controls...
April 6, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28409784/frequency-stabilized-diode-laser-with-variable-linewidth-at-a-wavelength-of-404-7%C3%A2-%C3%A2-nm
#17
Benjamin Rein, Thomas Walther
We report on a frequency stabilized laser system with a variable linewidth at a wavelength of 404.7 nm used as an incoherent repump on the 6P3<sub>0</sub>↔7S3<sub>1</sub> transition in mercury. By directly modulating the laser diode current with Gaussian white noise, the laser linewidth can be broadened up to 68 MHz. A Doppler-free dichroic atomic vapor laser lock spectroscopy provides an error signal suitable for frequency stabilization even for the broadened laser. Without the need of an acousto-optic modulator for the linewidth tuning or lock-in technique for frequency stabilization, this laser system provides an inexpensive approach for an incoherent and highly efficient repumper in atomic experiments...
April 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28399196/combined-use-of-laser-doppler-flowmetry-and-skin-thermometry-for-functional-diagnostics-of-intradermal-finger-vessels
#18
Evgeny A Zherebtsov, Angelina I Zherebtsova, Alexander Doronin, Andrey V Dunaev, Konstantin V Podmasteryev, Alexander Bykov, Igor Meglinski
No abstract text is available yet for this article.
April 1, 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/28397320/pregnancy-associated-plasma-protein-a-is-positively-correlated-to-first-trimester-skin-microvascular-reactivity
#19
C Iacobaeus, T Kahan, G Jörneskog, K Bremme, E Andolf, M Thorsell
OBJECTIVE: To investigate if there is a correlation between levels of circulating maternal pregnancy-associated plasma protein A (PAPP-A) and first trimester maternal vascular function. METHODS: A cross-sectional study of 53 healthy non-smoking, pregnant, nulliparous women in Stockholm, Sweden. PAPP-A and vascular function were assessed during gestational week 11-14. Forearm skin microcirculation was investigated by laser Doppler perfusion imaging during iontophoresis of acetylcholine (ACh) and sodium nitroprusside (SNP) to assess endothelium dependent and endothelium independent microvascular vasodilatation, respectively...
April 11, 2017: Ultrasound in Obstetrics & Gynecology
https://www.readbyqxmd.com/read/28395422/-dynamic-detection-of-surface-blood-flow-in-rat-heart-and-its-application-in-real-time-identification-of-myocardial-infarction-model
#20
Q Lei, C Chen, X L Wu, W J Chen, T Yi, M D Ma, Y He, X R Shui, S A Huang, C Chen, W Lei
Objective: To establish a method for monitoring the surface blood flow in the heart of rats, and to clarify the relationship between the degree of myocardial infarction and the blood perfusion on the surface of the heart, so as to provide a new indicator for the identification of rat myocardial infarction model. Methods: The rats were divided into control group (n=23) and model group (n=107), the rat hearts were scanned by the laser doppler perfusion imager before and after operation respectively, and the data was analyzed to acquire the rate of surface blood flow change of the heart...
April 4, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
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