title: The matrix-binding domain of microfibril-associated glycoprotein-1 targets active connective tissue growth factor to a fibroblast-produced extracellular matrix.
abstract: It is advantageous to use biomaterials in tissue engineering that stimulate extracellular matrix (ECM) production by the cellular component. Connective tissue growth factor (CTGF) stimulates type I collagen (COL1A1) transcription, but is functionally limited as a free molecule. Using a matrix-binding domain (MBD) from microfibril-associated glycoprotein-1, the fusion protein MBD-CTGF was targeted to the ECM and tested for COL1A1 transcriptional activation. MBD-CTGF produced by the ECM-synthesizing fibroblasts, or provided exogenously, localized to the elastic fiber ECM. MBD-CTGF, but not CTGF alone, led to a two-fold enhancement of COL1A1 expression. This study introduces a targeting technology that can be used to elevate collagen transcription in engineered tissues and thereby improve tissue mechanics.
authors.affiliation: Department of Biomedical Engineering, University of Minnesota, 7-105 Hasselmo Hall, 312 Church St. SE, Minneapolis, MN 55455, USA. weijus@umn.edu
authors.forename: Justin S
authors.initials: JS
authors.lastname: Weinbaum
authors.forename: Robert T
authors.initials: RT
authors.lastname: Tranquillo
authors.forename: Robert P
authors.initials: RP
authors.lastname: Mecham
mesh_terms: D000818:Animals; D016466:CHO Cells; D002460:Cell Line; D002478:Cells, Cultured; D018920:Coculture Techniques; D024042:Collagen Type I / Q000378:metabolism; D000090602:Collagen Type I, alpha 1 Chain; D055513:Connective Tissue Growth Factor / Q000235:genetics / Q000378:metabolism*; D003285:Contractile Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D006224:Cricetinae; D003412:Cricetulus; D005109:Extracellular Matrix / Q000378:metabolism*; D016326:Extracellular Matrix Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D005347:Fibroblasts / Q000378:metabolism*; D010957:Plasmids / Q000235:genetics; D054730:Protein Interaction Domains and Motifs / Q000235:genetics / Q000502:physiology*; D017434:Protein Structure, Tertiary; D021381:Protein Transport / Q000502:physiology*; D000072260:RNA Splicing Factors; D051381:Rats; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism*; D023822:Tissue Engineering / Q000379:methods; D014162:Transfection; D014333:Tropoelastin / Q000378:metabolism
chemical_list: C526317:CCN2 protein, human; D024042:Collagen Type I; D000090602:Collagen Type I, alpha 1 Chain; D003285:Contractile Proteins; D016326:Extracellular Matrix Proteins; D000072260:RNA Splicing Factors; D011993:Recombinant Fusion Proteins; D014333:Tropoelastin; C016598:microfibrillar protein; D055513:Connective Tissue Growth Factor
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