Matrix Biology and Cellular Interaction Group (GBMec), Department of Anatomy, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil.
National Institute of Metrology (InMetro), Quality and Technology, Head of Bioengineering Program, Xerem, RJ, Brazil; Head of Cell Therapy Center, Unit of Clinical Research, Fluminense Federal University, Niterói, RJ, Brazil.
Arch Biochem Biophys. 2014 Nov 1;561:74-87. doi: 10.1016/j.abb.2014.07.034. Epub 2014 Aug 23.
Bone-forming cells originate from distinct embryological layers, mesoderm (axial and appendicular bones) and ectoderm (precursor of neural crest cells, which mainly form facial bones). These cells will develop bones by two principal mechanisms: intramembranous and endochondral ossification. In both cases, condensation of multipotent mesenchymal cells occurs, at the site of the future bone, which differentiate into bone and cartilage-forming cells. During long bone development, an initial cartilaginous template is formed and replaced by bone in a coordinated and refined program involving chondrocyte proliferation and maturation, vascular invasion, recruitment of adult stem cells and intense remodeling of cartilage and bone matrix. Matrix metalloproteinases (MMPs) are the most important enzymes for cleaving structural components of the extracellular matrix (ECM), as well as other non-ECM molecules in the ECM space, pericellular perimeter and intracellularly. Thus, the bioactive molecules generated act on several biological events, such as development, tissue remodeling and homeostasis. Since the discovery of collagenase in bone cells, more than half of the MMP members have been detected in bone tissues under both physiological and pathological conditions. Pivotal functions of MMPs during development and bone regeneration have been revealed by knockout mouse models, such as chondrocyte proliferation and differentiation, osteoclast recruitment and function, bone modeling, coupling of bone resorption and formation (bone remodeling), osteoblast recruitment and survival, angiogenesis, osteocyte viability and function (biomechanical properties); as such alterations in MMP function may alter bone quality. In this review, we look at the principal properties of MMPs and their inhibitors (TIMPs and RECK), provide an up-date on their known functions in bone development and remodeling and discuss their potential application to Bone Bioengineering.
成骨细胞起源于不同的胚胎层,中胚层(轴骨和附肢骨)和外胚层(神经嵴细胞的前体,主要形成面骨)。这些细胞将通过两种主要机制发育骨骼:膜内和软骨内成骨。在这两种情况下,多能间充质细胞发生凝聚,在未来骨骼的部位,分化为成骨细胞和成软骨细胞。在长骨发育过程中,首先形成软骨模板,然后通过涉及软骨细胞增殖和成熟、血管侵袭、招募成年干细胞以及软骨和骨基质的强烈重塑的协调和精细的程序被骨取代。基质金属蛋白酶(MMPs)是裂解细胞外基质(ECM)结构成分以及 ECM 空间、细胞周界和细胞内其他非 ECM 分子的最重要的酶。因此,产生的生物活性分子作用于几个生物学事件,如发育、组织重塑和内稳态。自从在骨细胞中发现胶原酶以来,在生理和病理条件下的骨组织中已经检测到超过一半的 MMP 成员。通过敲除小鼠模型揭示了 MMPs 在发育和骨再生中的关键功能,例如软骨细胞增殖和分化、破骨细胞募集和功能、骨建模、骨吸收和形成的偶联(骨重塑)、成骨细胞募集和存活、血管生成、骨细胞活力和功能(生物力学特性);因此,MMP 功能的改变可能会改变骨质量。在这篇综述中,我们研究了 MMPs 及其抑制剂(TIMPs 和 RECK)的主要特性,提供了它们在骨发育和重塑中已知功能的最新信息,并讨论了它们在骨生物工程中的潜在应用。