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Quantification of fibronectin matrix assembly sites using a novel ELISA assay.


ABSTRACT: Binding of the N-terminus of fibronectin to assembly sites on the cell surface is an essential step in fibronectin fibrillogenesis. Fibronectin matrix assembly sites have customarily been quantified using an iodinated 70 kDa N-terminal fibronectin fragment. The 125I-70 K fragment is a less than ideal reagent because its preparation requires large amounts of plasma fibronectin and it has a fairly short shelf life. An additional limitation is that the cells responsible for binding the 125I-70 K cannot be quantified or identified directly but must be assessed in parallel cultures. To overcome these disadvantages, we developed an ELISA-based assay using a recombinant HA-tagged 70 K fragment. This assay allows for the simultaneous quantification and localization of matrix assembly sites on the surface of adherent cells.

SUBMITTER: Zheng M 

PROVIDER: S-EPMC1940232 | biostudies-literature | 2007 May

REPOSITORIES: biostudies-literature

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Quantification of fibronectin matrix assembly sites using a novel ELISA assay.

Zheng Mingzhe M   Ambesi Anthony A   Yu Lin L   McKeown-Longo Paula J PJ  

Matrix biology : journal of the International Society for Matrix Biology 20061229 4


Binding of the N-terminus of fibronectin to assembly sites on the cell surface is an essential step in fibronectin fibrillogenesis. Fibronectin matrix assembly sites have customarily been quantified using an iodinated 70 kDa N-terminal fibronectin fragment. The 125I-70 K fragment is a less than ideal reagent because its preparation requires large amounts of plasma fibronectin and it has a fairly short shelf life. An additional limitation is that the cells responsible for binding the 125I-70 K ca  ...[more]

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