New insights into extracellular matrix assembly and reorganization from dynamic imaging of extracellular matrix proteins in living osteoblasts

Journal of Cell Science
Pitchumani SivakumarSarah L Dallas

Abstract

The extracellular matrix (ECM) has been traditionally viewed as a static scaffold that supports cells and tissues. However, recent dynamic imaging studies suggest that ECM components are highly elastic and undergo continual movement and deformation. Latent transforming growth factor beta (TGFbeta) binding protein-1 (LTBP1) is an ECM glycoprotein that binds latent TGFbeta and regulates its availability and activity. LTBP1 initially co-distributes with fibronectin in the extracellular matrix of osteoblasts, and depends on fibronectin for its assembly. To gain further insights into the mechanisms of assembly of LTBP1 and its spatial and temporal interactions with fibronectin, we have performed dual fluorescence time-lapse imaging of these two proteins in living osteoblasts using fluorescent probes. Time-lapse movies showed surprisingly large fibril displacements associated with cellular movement as well as occasional breaking of LTBP1 or fibronectin-containing fibrils. Individual fibrils stretched to as much as 3.5 times or contracted to as much as one fourth of their original length. Motile cells appeared to actively mediate extracellular matrix assembly by adding 'globules' or 'packets' of matrix material onto existing fibrils. ...Continue Reading

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