Digital PNG artwork · delivered by email | Secure checkout · no physical shipping
Hedi Raizer

Journal 6 min read

What is the extracellular matrix?

The extracellular matrix is the non-cellular protein and polysaccharide network that surrounds cells. This page summarises what the research literature reports about its composition, mechanics and signalling roles across

peptides-pro Editorial

The extracellular matrix (ECM) is the non-cellular network of secreted proteins, glycoproteins and polysaccharides that occupies the space between cells and provides structural and biochemical context to the tissues it surrounds. It is not a single molecule but a class of assembled materials, and the literature describes it by its constituent fibrillar proteins — fibronectin, collagens, periostin — together with the proteoglycans and bound growth factors that associate with them. Because the ECM is a supramolecular assembly rather than a defined chemical entity, it has no single sequence, formula or molecular weight; the evidence block used for this page gives no such identifiers, and none are asserted here.

Research on ECM function in the studies cited below centres repeatedly on integrin receptors and on the downstream JNK and TGFβ-linked signalling routes through which matrix proteins are reported to influence cell behaviour [2][3][12].

Research Studies

Periostin and integrin-JNK signalling in arrhythmogenic cardiomyopathy models

Periostin (POSTN) is described as a multifunctional extracellular matrix protein in cardiovascular disease. In a study of arrhythmogenic cardiomyopathy (ACM), POSTN was reported to be significantly elevated in myocardium from ACM mice and from patients. POSTN deficiency in ACM mice alleviated heart dysfunction, reduced cardiac fibrosis and improved survival rates. The protein was reported to derive mainly from cardiac myofibroblasts and to promote cardiomyocyte necroptosis in vivo and in vitro, acting through integrin-JNK-RIP3-MLKL signalling, while inducing CCL3 expression via an integrin-JNK-ETS2 pathway; CCL3 in turn was reported to activate cardiac myofibroblasts, forming a feedforward loop [2].

Apabetalone and fibrotic activation of cardiac fibroblasts

Accumulation of ECM is described as a cause of tissue fibrosis contributing to myocardial dysfunction and heart failure, with no approved anti-fibrotic therapeutics targeting it. In cell models recapitulating cardiac fibrosis — human immortalised cardiac fibroblasts, cryopreserved cardiac fibroblasts, and ex vivo cultured fibroblasts from patients undergoing bypass grafting — the BET inhibitor apabetalone was tested for anti-fibrotic activity [3].

Fibronectin tension as a mechanical signature in idiopathic pulmonary fibrosis models

Idiopathic pulmonary fibrosis (IPF) is described as progressive and fatal with limited treatment options, and biomarkers indicating altered ECM signatures are reported to be scarce. Using patient-derived fibroblasts and the tension-sensitive fibronectin-binding peptide FnBPA5, whose multivalent binding to fibronectin is impaired by fibre strain, an in vitro fibrosis assay was established to relate ECM fibre tension to fibrosis progression, validated against known fibrosis biomarkers at protein and mRNA levels [8].

Fibronectin matrix assembly in astrocytes versus fibroblasts

Fibrillar fibronectin matrix is reported as the predominant ECM in most tissues, but in neural tissues it is limited to sites of tissue damage and disease. In work comparing neural cells, primary cortical astrocytes were shown to produce fibronectin and assemble it into fibrils through a process that differed from that seen in fibroblasts, with the effects of TGFβ on fibronectin matrix assembly differing between the two cell types [12].

MAFF and contraction-induced transcription in skeletal muscle models

Skeletal muscle adapts to exercise through rapid transcriptional remodelling. MAFF, a small MAF transcription factor, was reported to be consistently induced by acute exercise in both human and mouse skeletal muscle, with induction restricted to muscles recruited by the exercise modality. In C2C12 cells, Maff was induced by in vitro electrical pulse stimulation, and CRISPR/Cas9-mediated Maff knockout reduced myogenic fusion with accumulation of unfused nuclei and broad transcriptomic reprogramming in myotubes [4].

Graphene oxide-hydroxyapatite composites and ECM protein interactions

Graphene oxide (GO) has recognised protein-binding ability attributed to high surface area and oxygen functional groups but is limited by dose-dependent cytotoxicity, while hydroxyapatite (HA) is highly biocompatible with relatively weak protein-protein interactions at the molecular scale. Molecular docking, pharmacophore modelling and molecular dynamics simulations were used to explore interactions of GO, HA and GO-HA nanocomposites in the context of ECM protein interactions for osseointegration at dental implant interfaces [6].

Matrix metalloproteinases and related targets in cosmetic science

A review of molecular targets in cosmetic research highlights targeted modulation of biological macromolecules involved in skin ageing, pigmentation, inflammation and tissue regeneration, focusing on telomerase, histone deacetylases (particularly sirtuins), matrix metalloproteinases, antioxidant enzymes, CD44 receptor, tyrosinase, microphthalmia-associated transcription factor and melanocortin receptors [7].

Bone ageing as multiscale degeneration

Bone ageing is characterised in the literature not merely as bone mass loss but as a multi-level, networked degenerative phenomenon spanning molecular, cellular, tissue and system levels. At the macroscopic level it is described by declines in bone mass, microstructure and biomechanical properties [1].

BDNF and intervertebral disc degeneration

A registered clinical study notes that BDNF expression has been confirmed within intervertebral disc tissue, with degenerated discs showing increased BDNF expression compared with normal discs, and expression reported to increase further with degeneration severity. Intervertebral disc degeneration is described as closely associated with intradiscal nerve ingrowth [5].

Comparison of ECM-related study models

Study focusModel or populationReported observation
Periostin in ACM [2]ACM mice and patient myocardium; in vitro cardiomyocytesPOSTN elevated; deficiency reduced fibrosis and improved survival; integrin-JNK-RIP3-MLKL and integrin-JNK-ETS2 pathways implicated
Fibronectin tension in IPF [8]Patient-derived fibroblasts, in vitro assayFnBPA5 binding impaired by fibre strain; used to relate ECM tension to fibrosis progression
Fibronectin assembly [12]Primary cortical astrocytes vs fibroblastsAstrocytes produce and assemble fibronectin fibrils; TGFβ effects differ between cell types
Apabetalone in cardiac fibrosis [3]Human cardiac fibroblasts, ex vivo patient fibroblastsTested for anti-fibrotic activity in cell models of cardiac fibrosis

If you are reading this for personal health reasons

The materials described on this page are supplied for laboratory research use only. We do not provide dosing information, medical guidance or recommendations for personal use of any compound. Anyone considering a compound for their own health should speak to a licensed clinician.

Sources

WhatsApp