Department of Oral Cell Biology, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam, Amsterdam, The Netherlands.
Matrix Biol. 2010 Apr;29(3):209-18. doi: 10.1016/j.matbio.2009.12.001. Epub 2010 Jan 3.
Cartilage is a tissue with only limited reparative capacities. A small part of its volume is composed of cells, the remaining part being the hydrated extracellular matrix (ECM) with collagens and proteoglycans as its main constituents. The functioning of cartilage depends heavily on its ECM. Although it is known that the various (fibro)cartilaginous tissues (articular cartilage, annulus fibrosus, nucleus pulposus, and meniscus) differ from one each other with respect to their molecular make-up, remarkable little quantitative information is available with respect to its biochemical constituents, such as collagen content, or the various posttranslational modifications of collagen. Furthermore, we have noticed that tissue-engineering strategies to replace cartilaginous tissues pay in general little attention to the biochemical differences of the tissues or the phenotypical differences of the (fibro)chondrocytes under consideration. The goal of this paper is therefore to provide quantitative biochemical data from these tissues as a reference for further studies. We have chosen the goat as the source of these tissues, as this animal is widely accepted as an animal model in orthopaedic studies, e.g. in the field of cartilage degeneration and tissue engineering. Furthermore, we provide data on mRNA levels (from genes encoding proteins/enzymes involved in the synthesis and degradation of the ECM) from (fibro)chondrocytes that are freshly isolated from these tissues and from the same (fibro)chondrocytes that are cultured for 18 days in alginate beads. Expression levels of genes involved in the cross-linking of collagen were different between cells isolated from various cartilaginous tissues. This opens the possibility to include more markers than the commonly used chondrogenic markers type II collagen and aggrecan for cartilage tissue-engineering applications.
软骨是一种具有有限修复能力的组织。其体积的一小部分由细胞组成,其余部分为富含胶原蛋白和蛋白聚糖的水合细胞外基质 (ECM)。软骨的功能在很大程度上取决于其 ECM。尽管已知各种(纤维)软骨组织(关节软骨、纤维环、髓核和半月板)在分子组成上彼此不同,但关于其生化成分(如胶原蛋白含量或胶原蛋白的各种翻译后修饰)的定量信息却很少。此外,我们注意到,用于替代软骨组织的组织工程策略通常很少关注组织的生化差异或所考虑的(纤维)软骨细胞的表型差异。因此,本文的目的是提供这些组织的定量生化数据,作为进一步研究的参考。我们选择山羊作为这些组织的来源,因为这种动物被广泛接受为骨科研究中的动物模型,例如在软骨退变和组织工程领域。此外,我们还提供了从这些组织中新鲜分离的(纤维)软骨细胞以及在藻酸盐珠中培养 18 天的相同(纤维)软骨细胞的 mRNA 水平(编码参与 ECM 合成和降解的蛋白质/酶的基因)的数据。参与胶原蛋白交联的基因的表达水平在源自不同软骨组织的细胞之间存在差异。这为软骨组织工程应用提供了包括比常用的软骨形成标志物 II 型胶原蛋白和聚集蛋白聚糖更多的标志物的可能性。
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