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Author Mathews, Asha ♦ Colombus, Soumya ♦ Kalliyana, Krishnan V. ♦ Krishnan, L. K.
Source Sree Chitra Tirunal Institute for Medical Sciences & Technology
Content type Text
Publisher Journal of Tissue Engineering and Regenerative Medicine
File Format PDF
Language English
Subject Domain (in DDC) Technology ♦ Medicine & health ♦ Human physiology
Subject Domain (in MeSH) Cardiovascular System ♦ Tissues ♦ Cells ♦ Anatomy ♦ Organic Chemicals ♦ Biomedical and Dental Materials ♦ Chemicals and Drugs ♦ Investigative Techniques ♦ Analytical, Diagnostic and Therapeutic Techniques and Equipment
Subject Keyword Tissue Engineering
Abstract In vitro tissue engineering for fabrication of small diameter vascular grafts probably undergoes a sequence of events similar to the in vivo angiogenesis process. In both cases endothelial cells (ECs) play the crucial role in generating a non-thrombogenic vessel lumen and stabilization of ECs in the lumen of new vessels requires the deposition of collagen IV and elastin. Shear stress is an important in vivo signal for inducing synthesis of extracellular matrix (ECM) components, collagen IV and elastin, which form the basement membrane in the case of new blood vessels. Stimulation of ECs may therefore produce collagen and elastin in the lumen of a polymeric scaffold during the vascular tissue-engineering process if appropriate biochemical and mechanical signals are presented. However, the morphology and physicochemical characteristics of polymer scaffolds may also be crucial for EC monolayer formation and ECM deposition. In this study, tubular scaffolds made of biodegradable poly(e-caprolactone) (PCL) with biomimetic fibrin-based coating were evaluated to compare the effects of pore sizes on surface coverage of ECs and synthesis of ECM under dynamic culture conditions. Actin was stained for identification of cells, while specific antibodies were used for locating collagen IV and elastin deposition on the scaffolds. It was found that dynamic seeding of ECs in the lumen stabilized the cells and aligned them along the direction of flow, with better deposition of insoluble elastin and collagen IV when similar to 75% of pores were < 24 mu m in diameter. In addition, monolayer on the e-PCL scaffolds with lower pore sizes was found to produce nitric oxide (NO), indicating a non-thrombogenic EC layer in the lumen. Copyright (c) 2011 John Wiley & Sons, Ltd.
Education Level UG and PG
Learning Resource Type Article
Educational Framework Medical Council of India (MCI)
Volume Number 6
Issue Number 6
Page Count 11
Starting Page 451
Ending Page 461