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Ina Israel, Felix Fluri, Fabian Schadt, Adreas Buck, Samuel Samnick
BACKGROUND: P-selectin is activated early after stroke, followed by a rapid decline. This time course can be used to generate important information on stroke onset. The latter is crucial for therapeutic decision-making of wake-up strokes (i.e. thrombolysis or not). Here we evaluated the specific p-selectin inhibitor 68Ga-Fucoidan for assessing p-selectin activation after ischemic stroke using PET. METHODS: 68Ga-Fucoidan was investigated in rats brain at 2-5 h (n=16), and additionally at 24-26 h (n=9) and 48 h (n=3) after induction of photothrombic stroke or in sham operated animals (n=6)...
March 19, 2018: Current Neurovascular Research
Julie Garrier, Vadzim Reshetov, Susanna Gräfe, François Guillemin, Vladimir Zorin, Lina Bezdetnaya
Abstract Background: Photodynamic therapy (PDT) is a minimally invasive treatment modality for selective destruction of tumours. Critical anatomical structures, like blood vessels in close proximity to the tumour, could be harmed during PDT. Purpose: This study aims to discriminate the photoinduced response of normal and cancerous tissues to photodamage induced by liposomal formulations of meta-tetra(hydroxyphenyl)chlorin (mTHPC). Methods: Normal vascular and cancerous tissues were represented, respectively, by free and xenografted in vivo model of chick chorioallantoïc membrane (CAM)...
November 29, 2013: Journal of Drug Targeting
Kateryna Deykun, Marie Pometlova, Barbora Schutova, Jan Mares
Functional and morphological consequences of ischemic lesions are partially related to the production of reactive oxygen species (ROS). The aim of the study was to create a unilateral photothrombic lesion with minimal morphological changes and minor sensorimotor and cognitive deficits and also to test whether the application of ROS scavengers after the end of induction of ischemia had improved the functional outcome. Adult Wistar male rats were randomly divided into five groups: naive control, sham operated animals, animals with induced ischemia, and two groups of animals with induced ischemia and subsequent ROS scavenger application -melatonin or tempol...
September 2011: General Physiology and Biophysics
Bernadette Pegaz, Elodie Debefve, Jean-Pierre Ballini, Yvette Niamien Konan-Kouakou, Hubert van den Bergh
Particle size should be optimized to achieve targeted and extended drug delivery to the affected tissues. We describe here the effects of the mean particle size on the pharmacokinetics and photothrombic activity of meso-tetra(carboxyphenyl)porphyrin (TCPP), which is encapsulated into biodegradable nanoparticles based on poly(d,l-lactic acid). Four batches of nanoparticles with different mean sizes ranging from 121 to 343 nm, were prepared using the emulsification-diffusion technique. The extravasations of each TCPP-loaded nanoparticle formulation from blood vessels were measured, as well as the extent of photochemically induced vascular occlusion...
December 1, 2006: Journal of Photochemistry and Photobiology. B, Biology
B Pegaz, E Debefve, J-P Ballini, G Wagnières, S Spaniol, V Albrecht, D V Scheglmann, N E Nifantiev, H van den Bergh, Y N Konan-Kouakou
The objective of this study was to evaluate the ability of meso-tetra(hydroxyphenyl)chlorin (m-THPC) encapsulated into liposomal formulations to occlude neovascularization. Two m-THPC formulations including conventional or plain liposomes (Foslip) based on dipalmitoylphosphatidylcholine (DPPC) and the corresponding long-circulating poly(ethylene glycol) (PEG)-modified liposomes (PEGylated liposomes: Fospeg) were evaluated as delivery systems. Using the chick chorioallantoic membrane (CAM) as in vivo model, the fluorescence pharmacokinetic behaviour of encapsulated m-THPC reflecting the rate of the extravasation of the dye from the CAM vasculature and its photothrombic effectiveness were determined...
May 2006: European Journal of Pharmaceutical Sciences
Bernadette Pegaz, Elodie Debefve, Francois Borle, Jean-Pierre Ballini, Hubert van den Bergh, Yvette Niamien Kouakou-Konan
In the present work, we performed a preclinical inter-comparison study using several photosensitizers with the goal of optimizing photodynamic therapy (PDT) for the treatment of choroidal neovascularization (CNV) associated with age-related macular degeneration. The tested molecules were the porphyrins meso-tetraphenylporphyrin (TPP) and meso-tetra-(4-carboxyphenyl)-porphyrin (TCPP), and the chlorins pheophorbide-a (Pheo-a) and chlorin e(6) (Ce(6)). Each of these molecules was entrapped in biodegradable nanoparticles (NP) based on poly(d,l-lactic acid)...
July 1, 2005: Journal of Photochemistry and Photobiology. B, Biology
B Pegaz, E Debefve, F Borle, J-P Ballini, G Wagnières, S Spaniol, V Albrecht, D Scheglmann, N E Nifantiev, H van den Bergh, Y N Konan
In the present study, photodynamic activity of a novel photosensitizer (PS), Chlorin e(6)-2.5 N-methyl-d-glucamine (BLC 1010), was evaluated using the chorioallantoic membrane (CAM) as an in vivo model. After intravenous (i.v.) injection of BLC 1010 into the CAM vasculature, the applicability of this drug for photodynamic therapy (PDT) was assessed in terms of fluorescence pharmacokinetics, i.e. leakage from the CAM vessels, and photothrombic activity. The influence of different PDT parameters including drug and light doses on the photodynamic activity of BLC 1010 has been investigated...
November 2005: Photochemistry and Photobiology
N Lange, J P Ballini, G Wagnieres, H van den Bergh
PURPOSE: Because vascular occlusion has been observed as a consequence of photodynamic therapy (PDT), this method has been successfully used for the treatment of choroidal neovascularization (CNV) in age-related macular degeneration (AMD). However, most conventional photosensitizers, primarily developed for tumor PDT, lack selectivity for the targeting of neovascularization. An experimental model has been developed for drug screening of new photosensitizers for the treatment of CNV associated with AMD...
January 2001: Investigative Ophthalmology & Visual Science
H Y Kim, D K Vaughan, S Ghosh
Focal cerebral ischemia was produced in anesthetized rats by a minimally invasive photothrombic procedure. Rose bengal was injected into a tail vein and the right middle cerebral artery region irradiated for 5 min through the skull with the right common carotid artery temporarily occluded. This resulted in focal cerebral infarction which was restricted to the cortex as shown by autoradiography and histopathology. Edema and the uptake of 45Ca were determined 1, 3 or 24 hours after ischemia in different regions of the brain, ipsilateral and contralateral to the ischemic injury, the tracer uptake at three time points after administration...
March 1998: Neurological Research
H J Bidmon, J Wu, I Buchkremer-Ratzmann, B Mayer, O W Witte, K Zilles
Since ischemic insults lead to a deregulation of nitric oxide production which contributes to delayed neuronal death, we investigated changes in the distribution and amount of nitric oxide synthases I and II and in the appearance of nitrotyrosine caused by small, well-defined photothrombic lesions (2 mm in diameter) in the somatosensory cortex of rats. Four hours after lesioning, cell loss was evident in the core of the lesion and no nitric oxide synthase was present within this area, indicating that neurons expressing nitric oxide synthase I were lost or that nitric oxide synthase I was degraded...
January 1998: Neuroscience
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