Type VIII collagen is elevated in diseases associated with angiogenesis and vascular remodeling.

Type VIII collagen is involved in angiogenesis and remodeling of arteries. We hypothesized that type VIII collagen was upregulated in diseases associated with vascular remodeling, e.g. pulmonary fibrosis and cancer. In this paper we present the development and validation of a competitive enzyme-linked immunosorbent assay (ELISA) targeting type VIII collagen in serum and plasma.

A monoclonal antibody was raised against the C-terminal of type VIII collagen (C8-C) and a competitive ELISA was developed. The assay was evaluated in relation to epitope specificity, technical performance, and in relevant disease cohorts. The developed ELISA was applied for the assessment of type VIII collagen in serum from patients diagnosed with chronic obstructive pulmonary disease (COPD), idiopathic pulmonary fibrosis (IPF) and various cancers.

The C8-C ELISA was technically stable and applicable for measurements in serum and plasma samples. Concentrations of C8-C was increased in serum from patients diagnosed with COPD (n=68) (p<0.0001), SCC lung- (n=10) (p<0.0001), breast- (n=13) (p<0.0001), colon- (n=7) (p=0.002), melanoma- (n=7) (p=0.001), non-small cell lung- (n=12) (p<0.0001), ovary- (n=10) (p=0.0001), pancreas- (n=5) (p=0.017), prostate- (n=14) (p=0.001) and small cell lung cancer (n=8) (p=0.0002) when compared to controls (n=43). Concentrations of C8-C were not significantly increased in serum from patients diagnosed with IPF.

The C8-C assay was technically robust and specific for type VIII collagen. Concentrations of C8-C were significantly elevated in serum from patients diagnosed with COPD and within 9 different cancer types, but not IPF. Further research is required to test C8-C as an efficacy marker for angiostatic treatments.

Clinical biochemistry. 2016 May 24 [Epub ahead of print]

Niels Ulrik Brandt Hansen, Nicholas Willumsen, Jannie Marie Bülow Sand, Lise Larsen, Morten Asser Karsdal, Diana Julie Oersnes-Leeming

Nordic Bioscience A/S, Herlev Hovedgade 205, 2730 Herlev, Denmark; University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark. Electronic address: ., Nordic Bioscience A/S, Herlev Hovedgade 205, 2730 Herlev, Denmark; University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark. Electronic address: ., Nordic Bioscience A/S, Herlev Hovedgade 205, 2730 Herlev, Denmark; University of Copenhagen, Nørregade 10, 1165 Copenhagen K, Denmark. Electronic address: ., Nordic Bioscience A/S, Herlev Hovedgade 205, 2730 Herlev, Denmark. Electronic address: ., Nordic Bioscience A/S, Herlev Hovedgade 205, 2730 Herlev, Denmark; University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark. Electronic address: ., Nordic Bioscience A/S, Herlev Hovedgade 205, 2730 Herlev, Denmark. Electronic address: .

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