نتایج جستجو برای: permeability flux

تعداد نتایج: 135274  

Journal: :Blood 2004
Xiaochun Li Christopher N Hahn Michelle Parsons Jenny Drew Mathew A Vadas Jennifer R Gamble

Endothelial cell leakiness is regulated by mediators such as thrombin, which promotes endothelial permeability, and anti-inflammatory agents, such as angiopoietin-1. Here we define a new pathway involved in thrombin-induced permeability that involves the atypical protein kinase C isoform, PKCzeta. Chemical inhibitor studies implicated the involvement of an atypical PKC isoform in thrombin-induc...

2002
Josef Friedl Markus Puhlmann David L. Bartlett Steven K. Libutti Ewa N. Turner Michael F. X. Gnant

Tumor necrosis factor (TNF) has marked effects on permeability and procoagulant activity on tumor-associated neovasculature when used in isolation perfusion, the latter effect primarily mediated via induction of cell surface expression of tissue factor (TF) on endothelial tissue. However, the cellular events that result in rapid alterations in endothelial cell (EC) permeability after intravascu...

Journal: :Journal of applied physiology 2007
Nicolas de Prost Didier Dreyfuss Georges Saumon

Pulmonary microvascular and alveolar epithelial permeability were evaluated in vivo by scintigraphic imaging during lung distension. A zone of alveolar flooding was made by instilling a solution containing 99mTc-albumin in a bronchus. Alveolar epithelial permeability was estimated from the rate at which this tracer left the lungs. Microvascular permeability was simultaneously estimated measurin...

Journal: :The Journal of Experimental Medicine 2007
Mike G. Laukoetter Porfirio Nava Winston Y. Lee Eric A. Severson Christopher T. Capaldo Brian A. Babbin Ifor R. Williams Michael Koval Eric Peatman Jacquelyn A. Campbell Terence S. Dermody Asma Nusrat Charles A. Parkos

Recent evidence has linked intestinal permeability to mucosal inflammation, but molecular studies are lacking. Candidate regulatory molecules localized within the tight junction (TJ) include Junctional Adhesion Molecule (JAM-A), which has been implicated in the regulation of barrier function and leukocyte migration. Thus, we analyzed the intestinal mucosa of JAM-A-deficient (JAM-A(-/-)) mice fo...

Journal: :Journal of pharmacy & pharmaceutical sciences : a publication of the Canadian Society for Pharmaceutical Sciences, Societe canadienne des sciences pharmaceutiques 2007
Parvin Zakeri-Milani Hadi Valizadeh Hosnieh Tajerzadeh Yadollah Azarmi Ziba Islambolchilar Saeed Barzegar Mohammad Barzegar-Jalali

PURPOSE The aim of the study was the prediction of human intestinal permeability and fraction absorbed of oral dose using single-pass intestinal perfusion technique (SPIP) in rats. METHODS Permeability coefficients in anaesthetized rats were determined for 14 compounds. Drug solution in phosphate buffered saline (PBS) was perfused through a ingle-pass intestinal perfusion (SPIP) with flow rat...

Many studies have considered the effects of suspension properties on the dewatering process but fewhave focused on ore properties. Thus, the present work studied the effects of ore properties (density,particle size, mineralogy) on the dewatering process based on lab and pilot experiments. A hydrocyclonewas used to prepare the required samples for the experiments. To study the effects of mineral...

Journal: :Carcinogenesis 1999
A P Soler R D Miller K V Laughlin N Z Carp D M Klurfeld J M Mullin

Epithelial tissues act as barriers between two fluid compartments, and the epithelial barrier function is provided by the epithelial cells and the tight junctions (TJs) that connect them. We have shown previously that chronic treatment of a cultured epithelial monolayer with phorbol ester tumor promoters induces an increase in transepithelial paracellular permeability and produces tumor-like po...

Journal: :Cardiovascular Research 2009
Andrew H.J. Salmon Christopher R. Neal Leslie M. Sage Catherine A. Glass Steven J. Harper David O. Bates

AIMS In this study, we wished to determine whether angiopoietin-1 (Ang1) modified the permeability coefficients of non-inflamed, intact continuous, and fenestrated microvessels in vivo and to elucidate the underlying cellular mechanisms. METHODS AND RESULTS Permeability coefficients were measured using the Landis-Michel technique (in frog and rat mesenteric microvessels) and an oncopressive p...

Journal: :The American journal of physiology 1968
T Morgan R W Berliner

MORGAN, TREFOR, AND ROBERT MT. BERLINER. Permeability of the loop of Henle, uasu recta, and collecting duct to water, urea, and sodium. Am. J. Physiol. 215(l): 108-115. 1968.-The permeability of the loops of Henle, collecting ducts, and vasa recta have been studied by free-flow perfusion. When ADH was absent the diffusional permeability coefficient for THO in the descending limb (DL) was I 19 Z...

Journal: :Acta of bioengineering and biomechanics 2016
Li-Xin Guo Rui Li Ming Zhang

PURPOSE This study is to reveal the deformation of intervertebral disc (IVD), the stress distribution of solid phase and liquid phase, the variation of fluid flux and flow velocity in lumbar spine and the influence of different permeability parameters on them under intermittent compressive loading. METHODS A poroelastic FEM of L4-L5 is assigned with different permeability parameters to analyz...

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