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A Major Fraction of Fibronectin Present in the Extracellular Matrix of Tissues Is Plasma-derived
Journal article   Open access   Peer reviewed

A Major Fraction of Fibronectin Present in the Extracellular Matrix of Tissues Is Plasma-derived

Federico A Moretti, Anil K Chauhan, Alessandra Iaconcig, Fabiola Porro, Francisco E Baralle and Andrés F Muro
The Journal of biological chemistry, Vol.282(38), pp.28057-28062
09/21/2007
DOI: 10.1074/jbc.M611315200
PMID: 17644525
url
https://doi.org/10.1074/jbc.M611315200View
Published (Version of record) Open Access

Abstract

The origin of the fibronectin (FN) found in the extracellular matrix of tissues has not been defined experimentally. Previous studies suggest that there is contribution from both local tissue production and transfer from plasma, but the extent of this phenomenon has not been addressed. We have shown before that engineered mice constitutively expressing extra domain A-containing FN (EDA+FN) have a significant decrease of FN levels in plasma and most tissues. We showed that hepatocytes modified to produce EDA+FN have normal extracellular matrix-FN levels but secrete less soluble FN. When we performed a liver-specific EDA-exon deletion in these animals, FN levels were restored both in plasma and tissues. Therefore, an important fraction of tissue FN, approximately an equal amount of that produced by the tissue itself, is actually plasma-derived, suggesting that plasma is an important source of tissue FN. The present results have potential significance for understanding the contributions of plasma FN, and perhaps other plasma proteins, in the modulation of cellular activities and in the formation of the extracellular matrix of tissues.

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