Structure-activity relationships of chromogranin A in cell adhesion. Identification of an adhesion site for fibroblasts and smooth muscle cells

Sara Ratti, Flavio Curnis, Renato Longhi, Barbara Colombo, Anna Gasparri, Fulvio Magni, Ernesto Manera, Marie Hélène Metz-Boutigue, Angelo Corti

Research output: Contribution to journalArticle

Abstract

Previous studies showed that chromogranin A (CgA), a glycoprotein stored and co-released with various hormones by neuroendocrine cells and neurons, can modulate cell adhesion. We have investigated the structure-activity relationships of CgA using fibroblasts and coronary artery smooth muscle cells in adhesion assays. A recombinant CgA fragment 1-78 and a peptide 7-57 containing reduced and alkylated cysteines (Cys17 and Cys38) induced cell adhesion after adsorption onto solid phases at 50-100 nM. Peptides lacking the disulfide loop region, including residues 47-68, 39-59, and 39-68, induced cell adhesion, either bound to solid phases at 200-400 nM or added to the liquid phase at 5-10 μM, whereas peptide 60-68 was inactive, suggesting that residues 47-57 are important for activity. The effect of CGA-(1-78) was blocked by anti-CgA antibodies against epitopes including residues Arg53, His54, and Leu57. Substitutions of residues His54 Gln55, and Asn56 with alanine decreased the cell adhesion activity of peptide 47-68. These results suggest that the region 47-57 (RILSILRHQNL) contains a cell adhesion site and that the disulfide bridge is not necessary for the proadhesive activity. The ability of soluble peptides to elicit proadhesive effects suggests an indirect mechanism. The high sequence conservation and accessibility to antibodies suggest that this region is important for the physiological role of CgA.

Original languageEnglish
Pages (from-to)29257-29263
Number of pages7
JournalJournal of Biological Chemistry
Volume275
Issue number38
DOIs
Publication statusPublished - Sep 22 2000

ASJC Scopus subject areas

  • Biochemistry

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