Clinical Hemorheology and Microcirculation - Volume 33, issue 3

Article Type: Other

Citation: Clinical Hemorheology and Microcirculation, vol. 33, no. 3, pp. 165-165, 2005

Authors: Vitte, Joana | Benoliel, Anne-Marie | Pierres, Anne | Bongrand, Pierre

Article Type: Research Article

Abstract: Cell function usually requires an accurate control of attachment to and detachment from many other cells or biological surfaces. This is usually achieved by a combination of multiple cell processes the relative importance of which may be difficult to assess. The aim of this review is to discuss the role of different mechanisms used to control adhesion on the basis of selected examples and recently developed methodologies allowing quantitative study of cell adhesion. It is concluded that cells control adhesion by modifying (i) adhesion receptor expression, as a consequence of exocytosis, endocytosis, or proteolytic mechanisms, (ii) adhesion receptor intrinsic activity, …through a variety of conformational changes, (iii) receptor organisation in cell membranes, as a consequence of topographical distribution and clustering, lateral mobility, and strength of anchoring to the cytoskeleton, and (iv) general processes unrelated to a specific receptors, such as glycocalyx changes or modification of cell shape or surface mechanical properties. Show more

Citation: Clinical Hemorheology and Microcirculation, vol. 33, no. 3, pp. 167-188, 2005

Authors: Oddou, C. | Pierre, J.

Article Type: Research Article

Abstract: This article provides a very brief overview of how some major mechanical properties of biological tissue and their substitutes can be described and quantified in basic form in order to understand their physiological functioning from the viewpoint of tissue regeneration, then allowing new developments in tissue engineering. After shortly reviewing the main rheological properties we have focused on the related phenomena of mass and momentum transport through tissue, considering the poroelastic characteristics of these media. Using very rough approach, it is shown how the biphasic nature of these media can influence mechanical stresses and nutriment feeding of the imbedded cells.

Citation: Clinical Hemorheology and Microcirculation, vol. 33, no. 3, pp. 189-195, 2005

Authors: Baaijens, Frank | Bouten, Carlijn | Hoerstrup, Simon | Mol, Anita | Driessen, Niels | Boerboom, Ralf

Article Type: Research Article

Citation: Clinical Hemorheology and Microcirculation, vol. 33, no. 3, pp. 197-199, 2005

Authors: Boisseau, Michel René

Article Type: Research Article

Abstract: Under the influence of heart and elasticity of arteries, circulating blood constantly acts upon the layers of the vessels, covered by active endothelial cells. The shear stress appears like the most efficient mechanical factor developing a rubbing physical force, the laminar flow. But pulsating and centrifugal forces allow shear to be often unsteady. Mechanobiology investigates receptors and transduction across wall cells, showing that thousands of genes are activated in the endothelium leading to a lot of adaptable functions. Atherosclerosis is due to disturbances of laminar flow in specific areas where low shear allows white cells to adhere and migrate, permeability …to increase. Coronaropathies, cerebral vascular accidents, aneurisms are so geometrically local diseases, of which lesions are subsequently enhanced by risk factors. Chronic venous insufficiency is also related to physical forces: hydrostatic and centrifugal pressures, and disruption of shear stress along the wall and around valvulae. Here also similar cells and biochemical phenomenons are the cause of wall remodelling and varicose. At the level of microcirculation the shear stress fall induces hypoxia, accumulation of white cells and hemorheological disorders in microvenulae. This leads to lesions of tissue, small vessel and ulcers. Numerous treatments in vascular diseases tend to restore flow and blood shearing. However a better understanding in the future should open new therapeutic fields and genetic approaches. Show more

Citation: Clinical Hemorheology and Microcirculation, vol. 33, no. 3, pp. 201-207, 2005

Authors: Alobaid, Nasser | Salacinski, Henryk J. | Sales, Kevin M. | Hamilton, George | Seifalian, Alexander M.

Article Type: Research Article

Abstract: Small-diameter prosthetic cardiovascular bypass grafts have high occlusion rates. Thrombogenicity caused by the lack of endothelial cells (ECs) on the luminal surface of the grafts is one of the main reasons for its occlusion. One strategy to improve the clinical performance of cardiovascular prosthetic grafts has been to seed its luminal surface with a monolayer of the patient's own ECs. In this strategy a “two stage” seeding procedure is utilized whereby cells obtained from a vein are amplified in cell culture, then seeded onto a fibrin–arginine–glycine–aspartate (RGD) tripeptide-enriched expanded polytetrafluoroethylene (ePTFE) graft in a rotating bioreactor for one week, after …which it is surgically implanted. This achieves patency rates approaching those of vein grafts. The disadvantage of two stage seeding is that it requires culture facilities, a large amount of RGD, which is expensive and is confined to elective cases because of the delay between cell cultivation, seeding, and graft implantation. A single stage seeding using freshly extracted ECs that is transplanted onto the graft at the same time frame of the bypass operation without the need for cell cultivation would be an ideal answer for the disadvantages of two stage seeding. Animal trials have been successful but human trials of single stage seeding have been disappointing. It has been hypothesized that extracted ECs are scarce, furthermore, they are washed off the graft surface once exposed to blood flow. This review examines the various techniques/technologies to improve endothelial cell extraction from various sources and retention onto the luminal surface of prosthetic cardiovascular grafts in order to develop a clinically applicable strategy for single stage seeding. Show more

Keywords: Endothelium, seeding, vascular bypass graft, cell extraction, microvascular endothelial cells, progenitor cells, tissue engineering, polymers, cell retention

Citation: Clinical Hemorheology and Microcirculation, vol. 33, no. 3, pp. 209-226, 2005

Authors: Bordenave, L. | Fernandez, Ph. | Rémy-Zolghadri, M. | Villars, S. | Daculsi, R. | Midy, D.

Article Type: Research Article

Abstract: The replacement of arteries with synthetic vascular prostheses often leads to failure when small-diameter or low-flow locations are concerned, due in part to the thrombogenicity of the graft surface. In order to improve long-term patency of these grafts, the concept of endothelial cell seeding has been suggested, the composite structure resulting from the combination of biologically active cells to prosthetic materials thus creating more biocompatible vascular substitutes. To achieve endothelialization of synthetic grafts, previous efforts aimed at “one-stage” procedure in the 1980's seemed clinically feasible but results of reported clinical trials were controversial and mostly disappointing. An alternative method is …an in vitro complete and preformed endothelial lining at the time of implantation: the “two-stage” procedure which implies harvest and culture of autologous endothelial cells. Up to date, the latter approach demonstrated its superiority in terms of significantly increased patency of the grafts that underwent endothelialization several years earlier. Show more

Citation: Clinical Hemorheology and Microcirculation, vol. 33, no. 3, pp. 227-234, 2005

Authors: Choserot, Christophe | Péry, Emilie | Goebel, Jean-Christophe | Dumas, Dominique | Didelon, Jacques | Stoltz, Jean-François | Blondel, Walter C.P.M.

Article Type: Research Article

Abstract: The study of mechanical properties of the arterial wall is an important step in the comprehension of the vascular physiopathological functioning. However, cryopreserving biological tissues using very low temperatures can induce biological and structural modifications which may involve complications (dilatation, bursting, stenosis) after reimplantation. Many procedures of mechanical tests (traction, dilatation) developped in research allow us to comprehend and analyse rheological behaviour of the arterial wall. The study presented in this article offers a new perspective to detect changes of mechanical properties of cryopreserved arterial samples. In fact, the original idea is to couple a mechanical test bed (uniaxial traction …of arterial rings) with spectroscopic measurements (autofluorescence) for the purpose of correlating mechanical modifications and spectral variations. Ultimately, this new approach could lead to develop a device allowing atraumatic and contactless optical examinations of arterial graft to determine its mechanical state before reimplantation. Show more

Citation: Clinical Hemorheology and Microcirculation, vol. 33, no. 3, pp. 235-242, 2005

Authors: Traoré, M. | Sun, R.J. | Fawzi-Grancher, S. | Dumas, D. | Qing, X. | Santus, R. | Stoltz, J.-F. | Muller, S.

Article Type: Research Article

Abstract: We studied the effect of mechanical forces (shear stress) on the kinetics of internalization of native LDL and ox-LDL in endothelial cell line ECV304. This study was performed by using Confocal microscopy and FRET with two carbocyanine dyes, 1,1′-dioctadecyl-3,3,3′,3′-tetramethylindocarbocyanine perchlorate (DiO) as the donor and 3,3′-dioctadecyloxacarbocyanine perchlorate (DiI) as the receptor. The cells were incubated with a culture medium containing either 10 μg/ml DiI-LDL or DiO-LDL in static conditions or subjected to a laminar flow under a Confocal Laser Scanning Microscope (SP2 Leica, Germany). The results showed: (1) the possibility to evaluate the kinetics of LDL endocytosis in living cells, …(2) shear stress in comparison with control group more effectively enhanced LDL uptake, (3) ox-LDL (>50 μg/ml) >4 hours incubation was found to affect the cells as reflected by their detachment at low shear stress. Show more

Keywords: Atherosclerosis, low density lipoproteins, shear stress, confocal microscopy, kinetics

Citation: Clinical Hemorheology and Microcirculation, vol. 33, no. 3, pp. 243-251, 2005

Authors: Fawzi-Grancher, S. | Sun, R.J. | Traoré, Mariama | Stoltz, J.F. | Muller, S.

Article Type: Research Article

Abstract: The aim of this work was to study the influences of Ca2+ (medium free calcium, with BAPTA, with 100 mM Ca2+ , 100 mM Ca2+ +10 μM ionomycin) on the expression of caveolin-1 (structural protein of caveolae) of endothelial cells (ECs) submitted to mechanical forces (shear stress) or biochemical stimulation (TNF-α). We found that shear stress enhanced the caveolin-1 expression. Simultaneously, the caveolin-1 expression is dependant on [Ca2+ ]i: [Ca2+ ]free medium+100 μM BAPTA <[Ca2+ ]free medium <[Ca2+ ]100 mM <[Ca2+ ]100 mM+10 μM ionomycin . In contrast, TNF-α induced a decrease of caveolin-1 in the cells, whatever the …[Ca2+ ]i. These results suggest that there could be a synergistic effect between shear stress and Ca2+ on caveolin-1 expression but an inflammatory stimulation (TNF-α) induces a down regulation of caveolin-1 expression. Show more

Keywords: Caveolin-1, Ca$^{2+}$, endothelial cell, TNF-α, shear stress, 3D fluorescence microscopy

Citation: Clinical Hemorheology and Microcirculation, vol. 33, no. 3, pp. 253-261, 2005