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Hedi Raizer

Journal 5 min read

What markers track the extracellular matrix?

Extracellular matrix markers span structural proteins, tension-sensitive conformers and transcriptional regulators. This page summarises what the cited studies measured, in which models, and where the evidence remains an

peptides-pro Editorial

The extracellular matrix (ECM) is the non-cellular network of proteins and polysaccharides that surrounds cells in most tissues; its principal structural constituents include fibronectin, collagens, periostin and, in mineralised tissue, hydroxyapatite-associated protein interfaces. Because ECM composition and mechanics shift with disease, the markers used to track it fall into three broad classes: structural proteins whose abundance changes, conformation- or tension-sensitive readouts of those proteins, and transcription factors or signalling intermediates that report on the cells depositing the matrix. Identifiers vary by marker — fibronectin and periostin are large multidomain glycoproteins, while matrix metalloproteinases and their regulators are typically described by gene and protein family rather than by a single formula [7][8].

Much of the mechanistic work in this area centres on integrin-mediated adhesion and the downstream kinase cascades it engages, with the integrin–JNK axis recurring across cardiac and fibrotic models [2].

Research Studies

Periostin and integrin–JNK signalling in arrhythmogenic cardiomyopathy

Periostin (POSTN) is a multifunctional ECM protein. In a study of arrhythmogenic cardiomyopathy, POSTN was elevated in the myocardium of both ACM mice and patients. POSTN deficiency in mice alleviated heart dysfunction, reduced cardiac fibrosis and improved survival. The protein was derived mainly from cardiac myofibroblasts and promoted cardiomyocyte necroptosis in vivo and in vitro, acting through integrin–JNK–RIP3–MLKL signalling and inducing CCL3 via an integrin–JNK–ETS2 route; CCL3 in turn activated cardiac cells, forming a feedforward loop [2].

Fibronectin tension and fibrotic ECM in idiopathic pulmonary fibrosis models

In idiopathic pulmonary fibrosis, ECM composition and mechanics are thought to contribute to pathogenesis, but markers of altered ECM signature are scarce. Using patient-derived fibroblasts in an in vitro fibrosis assay with the tension-sensitive fibronectin-binding peptide FnBPA5, whose multivalent binding to fibronectin is impaired by fibre strain, investigators demonstrated a direct relationship between ECM fibre tension and fibrosis progression; the system was validated against known fibrosis biomarkers at protein and mRNA level [8].

Fibronectin matrix assembly in astrocytes versus fibroblasts

Fibrillar fibronectin is the predominant ECM in most tissues, but in neural tissue it is largely restricted to sites of damage and disease. Primary cortical astrocytes were shown to produce fibronectin and assemble it into fibrils, and the response to TGFβ differed between astrocytes and fibroblasts in this assembly process [12].

Apabetalone and fibrotic activation of cardiac fibroblasts

ECM accumulation drives tissue fibrosis and myocardial dysfunction, and no approved anti-fibrotic therapy targets it directly. In 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 in cell models recapitulating cardiac fibrosis [3].

MAFF and contraction-induced transcription in skeletal muscle

MAFF, a small MAF transcription factor, was 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; CRISPR/Cas9-mediated Maff knockout reduced myogenic fusion with accumulation of unfused nuclei, and RNA sequencing showed broad reprogramming in Maff-deficient myotubes [4].

BDNF and disc degeneration grading

A registered clinical study examines the correlation between serum BDNF levels, Pfirrmann grading and IL-1β in intervertebral disc degeneration. BDNF expression has been confirmed within disc tissue, with degenerated discs showing increased expression relative to normal discs and further increases reported with degeneration severity; disc degeneration is closely associated with intradiscal nerve ingrowth [5].

GO–HA nanocomposite coatings and ECM protein interactions

Graphene oxide binds proteins strongly through its surface area and oxygen functional groups but carries dose-dependent cytotoxicity, whereas hydroxyapatite is biocompatible with comparatively 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 at the implant–tissue interface [6].

Matrix metalloproteinases and related targets in skin biology

A review of molecular targets in cosmetic science identifies matrix metalloproteinases, antioxidant enzymes, CD44 receptor, tyrosinase, MITF, melanocortin receptors, telomerase and histone deacetylases (particularly sirtuins) as regulators of DNA repair, gene expression and ECM turnover in skin ageing, pigmentation, inflammation and tissue regeneration [7].

Bone ageing as multiscale ECM degeneration

Bone ageing is described not simply as bone mass loss but as a multi-level degenerative phenomenon spanning molecular, cellular, tissue and system levels, characterised macroscopically by declines in bone mass, microstructure and biomechanical properties [1].

MarkerClassModel / population in the cited work
Periostin (POSTN)Matricellular ECM proteinACM mice and patient myocardium; cardiac myofibroblasts [2]
Fibronectin (tension state)Structural ECM protein, mechanosensitive readoutPatient-derived fibroblasts, in vitro IPF fibrosis assay [8]
Fibronectin (fibrillar assembly)Structural ECM proteinPrimary cortical astrocytes vs fibroblasts [12]
MAFFTranscription factorHuman and mouse skeletal muscle; C2C12 cells [4]
BDNFNeurotrophinIntervertebral disc tissue; registered clinical study [5]
MMPs, CD44, sirtuinsEnzymes and receptorsReview of skin biology targets [7]

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