Link protein is ubiquitously expressed in non-cartilaginous tissues where it enhances and stabilizes the interaction of proteoglycans with hyaluronic acid

François Binette, Janet Cravens, Behnam Kahoussi, Dominik R Haudenschild, Paul F. Goetinck

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100 Citations (Scopus)

Abstract

Link protein (LP) is an abundant protein of cartilage which stabilizes the interaction of aggrecan with hyaluronic acid (HA). In this study we report that LP is also present in a large number of embryonic non-cartilaginous tissues. We demonstrate, using RNase protection experiments, that the coding region of the LP mRNAs isolated from these tissues is identical to that present in cartilage. Furthermore, we show that the LP mRNAs are translated in non-cartilaginous tissues by the identification of LP polypeptides with monoclonal antibody 4B6/A5 in Western blots. LP is localized in the extracellular matrix of the mesoderm along the entire digestive tract and in the dermis of the embryonic skin as revealed by immunofluorescence analysis. Investigations on the interactions between LP and proteoglycans from skin and proventriculus demonstrate that LP can enhance the binding of proteoglycans from these tissues to HA. In addition, we find that the same proteoglycans bound to HA in the presence of LP are always more resistant to competition by soluble HA than in the absence of LP. Our results suggest that LP is involved in the stabilization of extracellular matrices of a wide variety of non- cartilaginous tissues.

Original languageEnglish (US)
Pages (from-to)19116-19122
Number of pages7
JournalJournal of Biological Chemistry
Volume269
Issue number29
StatePublished - Jul 22 1994
Externally publishedYes

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Proteoglycans
Hyaluronic Acid
Tissue
Cartilage
Extracellular Matrix
Skin
link protein
Proventriculus
Aggrecans
Messenger RNA
Mesoderm
Dermis
Ribonucleases
Fluorescent Antibody Technique
Gastrointestinal Tract
Stabilization
Western Blotting
Monoclonal Antibodies
Peptides

ASJC Scopus subject areas

  • Biochemistry

Cite this

Link protein is ubiquitously expressed in non-cartilaginous tissues where it enhances and stabilizes the interaction of proteoglycans with hyaluronic acid. / Binette, François; Cravens, Janet; Kahoussi, Behnam; Haudenschild, Dominik R; Goetinck, Paul F.

In: Journal of Biological Chemistry, Vol. 269, No. 29, 22.07.1994, p. 19116-19122.

Research output: Contribution to journalArticle

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N2 - Link protein (LP) is an abundant protein of cartilage which stabilizes the interaction of aggrecan with hyaluronic acid (HA). In this study we report that LP is also present in a large number of embryonic non-cartilaginous tissues. We demonstrate, using RNase protection experiments, that the coding region of the LP mRNAs isolated from these tissues is identical to that present in cartilage. Furthermore, we show that the LP mRNAs are translated in non-cartilaginous tissues by the identification of LP polypeptides with monoclonal antibody 4B6/A5 in Western blots. LP is localized in the extracellular matrix of the mesoderm along the entire digestive tract and in the dermis of the embryonic skin as revealed by immunofluorescence analysis. Investigations on the interactions between LP and proteoglycans from skin and proventriculus demonstrate that LP can enhance the binding of proteoglycans from these tissues to HA. In addition, we find that the same proteoglycans bound to HA in the presence of LP are always more resistant to competition by soluble HA than in the absence of LP. Our results suggest that LP is involved in the stabilization of extracellular matrices of a wide variety of non- cartilaginous tissues.

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