Extracellular matrix growth factor reservoir (ECM-GF reservoir)

The extracellular matrix (ECM) growth factor reservoir is a functional compartment where signaling molecules like VEGF, FGF, and TGF-beta are sequestered by binding to ECM components, particularly heparan sulfate proteoglycans (HSPGs) (Hynes, 2009, Science; Bishop et al., 2007, Nature). This sequestration serves to protect growth factors from proteolytic degradation, establish morphogen gradients, and provide a localized supply of signals that can be rapidly mobilized (Taipale & Keski-Oja, 1997, FASEB J). The release of these factors is typically mediated by enzymes such as matrix metalloproteinases (MMPs) and heparanases, which degrade the ECM scaffold during tissue remodeling or injury (Vlodavsky et al., 2012, Matrix Biol). In diseases like cancer, the ECM reservoir is often exploited to drive angiogenesis and metastasis through the over-activation of these releasing enzymes (Gospodarowicz et al., 1987, J Cell Physiol). Pharmacological strategies targeting this system include heparanase inhibitors like Roneparstat and heparin mimetics like Pixatimod, which aim to prevent the pathological mobilization of sequestered growth factors (Hammond et al., 2014, Br J Cancer). Additionally, the ECM reservoir plays a crucial role in fibrosis, where excessive accumulation of matrix-bound factors like TGF-beta promotes myofibroblast activation and persistent scarring (Hynes, 2009, Science).

Other names

ECM growth factor reservoirExtracellular matrix sequestration siteGrowth factor-ECM complexMatrisome-associated growth factors

Inhibition of growth factor mobilization from the extracellular matrix by targeting degradative enzymes or competing for binding sites.