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There are principally two types of cells found in cusp tissue: the endothelial cells that cover the surface of the cusps and the interstitial cells (ICs) that form a network within the extracellular matrix (ECM) within the body of the cusp. Both cell types exhibit unique functions that are unlike those of other endothelial and ICs found throughout the body. The valve ICs express a complex pattern of cell-surface, cytoskeletal and muscle proteins. They are able to bind to, and communicate with, each other and the ECM. The endothelial cells on the outflow and inflow surfaces of the valve differ from one another. Their individual characteristics and functions reflect the fact that they are exposed to separate patterns of flow and pressure. In addition to providing a structural role in the valve, it is now known that the biological function of valve cells is important in maintaining the integrity of the cusps and the optimum function of the valve. In response to inappropriate stimuli, valve interstitial and endothelial cells may also participate in processes that lead to valve degeneration and calcification. Understanding the complex biology of valve interstitial and endothelial cells is an important requirement in elucidating the mechanisms that regulate valve function in health and disease, as well as setting a benchmark for the function of cells that may be used to tissue engineer a heart valve.<\/jats:p>","DOI":"10.1098\/rstb.2007.2126","type":"journal-article","created":{"date-parts":[[2007,6,19]],"date-time":"2007-06-19T17:41:46Z","timestamp":1182274906000},"page":"1437-1443","source":"Crossref","is-referenced-by-count":112,"title":["Molecular and functional characteristics of heart-valve interstitial cells"],"prefix":"10.1098","volume":"362","author":[{"given":"Adrian H","family":"Chester","sequence":"first","affiliation":[{"name":"Department of Cardiothoracic Surgery, Heart Science Centre, Harefield Hospital, NHLI, Imperial College of Science Technology and MedicineLondon SW7 2AZ, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Patricia M","family":"Taylor","sequence":"additional","affiliation":[{"name":"Department of Cardiothoracic Surgery, Heart Science Centre, Harefield Hospital, NHLI, Imperial College of Science Technology and MedicineLondon SW7 2AZ, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"175","published-online":{"date-parts":[[2007,6,14]]},"reference":[{"key":"e_1_3_2_2_1","doi-asserted-by":"publisher","DOI":"10.1161\/CIRCULATIONAHA.105.591768"},{"key":"e_1_3_2_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/jcp.1041590120"},{"key":"e_1_3_2_4_1","doi-asserted-by":"publisher","DOI":"10.1007\/BF00301830"},{"key":"e_1_3_2_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0003-4975(02)04706-9"},{"key":"e_1_3_2_6_1","doi-asserted-by":"publisher","DOI":"10.1152\/ajpcell.1996.270.2.C522"},{"key":"e_1_3_2_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.biocel.2005.06.018"},{"key":"e_1_3_2_8_1","doi-asserted-by":"publisher","DOI":"10.1098\/rstb.2007.2130"},{"key":"e_1_3_2_9_1","doi-asserted-by":"publisher","DOI":"10.1161\/01.ATV.0000130462.50769.5a"},{"key":"e_1_3_2_10_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jacc.2006.02.040"},{"key":"e_1_3_2_11_1","first-page":"250","article-title":"Receptor-mediated contraction of aortic valve leaflets","volume":"9","author":"Chester A.H","year":"2000","journal-title":"J. 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