Abstract
In response to injury, tendon fibroblasts are activated, migrate to the wound, and contribute to tissue repair by producing and organizing the extracellular matrix. Collagen VI is a microfibrillar collagen enriched in the pericellular matrix of tendon fibroblasts with a potential regulatory role in tendon repair mechanism. We investigated the molecular basis of the interaction between collagen VI and the cell membrane both in tissue sections and fibroblast cultures of human tendon, and analyzed the deposition of collagen VI during migration and myofibroblast trans-differentiation, two crucial events for tendon repair. Tendon fibroblast displayed a collagen VI microfibrillar network closely associated with the cell surface. Binding of collagen VI with the cell membrane was mediated by NG2 proteoglycan, as demonstrated by in vitro perturbation of collagen VI-NG2 interaction with a NG2-blocking antibody.Cultures subjected to wound healing scratch assay displayed collagen VI-NG2 complexes at the trailing edge of migrating cells, suggesting a potential role in cell migration. In fact, the addition of a NG2-blocking antibody led to an impairment of cell polarization and delay of wound closure. Similar results were obtained after in vitro perturbation of collagen VI extracellular assembly with the 3C4 anti-collagen VI antibody and in collagen VI-deficient tendon cultures of a Ullrich congenital muscular dystrophy patient carrying mutations in COL6A2 gene.Moreover, in vitro treatment with transforming growth factor β1 (TGFβ1) induced a dramatic reduction of NG2 expression, both at protein and mRNA transcript level, and the impairment of collagen VI association with the cell membrane. Instead, collagen VI was still detectable in the extracellular matrix in association with ED-A fibronectin and collagen I, which were strongly induced by TGFβ1 treatment.Our findings reveal a critical role of the NG2 proteoglycan for the binding of collagen VI to the surface of tendon fibroblasts. By interacting with NG2 proteoglycan and other extracellular matrix proteins, collagen VI regulates fibroblasts behavior and the assembly of tendon matrix, thereby playing a crucial role in tendon repair.
| Original language | English |
|---|---|
| Journal | Matrix Biology |
| DOIs | |
| Publication status | Accepted/In press - Nov 3 2015 |
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Keywords
- Cell migration
- Collagen VI
- NG2 proteoglycan
- Tendon repair
- Transforming growth factor β1
ASJC Scopus subject areas
- Molecular Biology
Cite this
Collagen VI-NG2 axis in human tendon fibroblasts under conditions mimicking injury response. / Sardone, Francesca; Santi, Spartaco; Tagliavini, Francesca; Traina, Francesco; Merlini, Luciano; Squarzoni, Stefano; Cescon, Matilde; Wagener, Raimund; Maraldi, Nadir Mario; Bonaldo, Paolo; Faldini, Cesare; Sabatelli, Patrizia.
In: Matrix Biology, 03.11.2015.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Collagen VI-NG2 axis in human tendon fibroblasts under conditions mimicking injury response
AU - Sardone, Francesca
AU - Santi, Spartaco
AU - Tagliavini, Francesca
AU - Traina, Francesco
AU - Merlini, Luciano
AU - Squarzoni, Stefano
AU - Cescon, Matilde
AU - Wagener, Raimund
AU - Maraldi, Nadir Mario
AU - Bonaldo, Paolo
AU - Faldini, Cesare
AU - Sabatelli, Patrizia
PY - 2015/11/3
Y1 - 2015/11/3
N2 - In response to injury, tendon fibroblasts are activated, migrate to the wound, and contribute to tissue repair by producing and organizing the extracellular matrix. Collagen VI is a microfibrillar collagen enriched in the pericellular matrix of tendon fibroblasts with a potential regulatory role in tendon repair mechanism. We investigated the molecular basis of the interaction between collagen VI and the cell membrane both in tissue sections and fibroblast cultures of human tendon, and analyzed the deposition of collagen VI during migration and myofibroblast trans-differentiation, two crucial events for tendon repair. Tendon fibroblast displayed a collagen VI microfibrillar network closely associated with the cell surface. Binding of collagen VI with the cell membrane was mediated by NG2 proteoglycan, as demonstrated by in vitro perturbation of collagen VI-NG2 interaction with a NG2-blocking antibody.Cultures subjected to wound healing scratch assay displayed collagen VI-NG2 complexes at the trailing edge of migrating cells, suggesting a potential role in cell migration. In fact, the addition of a NG2-blocking antibody led to an impairment of cell polarization and delay of wound closure. Similar results were obtained after in vitro perturbation of collagen VI extracellular assembly with the 3C4 anti-collagen VI antibody and in collagen VI-deficient tendon cultures of a Ullrich congenital muscular dystrophy patient carrying mutations in COL6A2 gene.Moreover, in vitro treatment with transforming growth factor β1 (TGFβ1) induced a dramatic reduction of NG2 expression, both at protein and mRNA transcript level, and the impairment of collagen VI association with the cell membrane. Instead, collagen VI was still detectable in the extracellular matrix in association with ED-A fibronectin and collagen I, which were strongly induced by TGFβ1 treatment.Our findings reveal a critical role of the NG2 proteoglycan for the binding of collagen VI to the surface of tendon fibroblasts. By interacting with NG2 proteoglycan and other extracellular matrix proteins, collagen VI regulates fibroblasts behavior and the assembly of tendon matrix, thereby playing a crucial role in tendon repair.
AB - In response to injury, tendon fibroblasts are activated, migrate to the wound, and contribute to tissue repair by producing and organizing the extracellular matrix. Collagen VI is a microfibrillar collagen enriched in the pericellular matrix of tendon fibroblasts with a potential regulatory role in tendon repair mechanism. We investigated the molecular basis of the interaction between collagen VI and the cell membrane both in tissue sections and fibroblast cultures of human tendon, and analyzed the deposition of collagen VI during migration and myofibroblast trans-differentiation, two crucial events for tendon repair. Tendon fibroblast displayed a collagen VI microfibrillar network closely associated with the cell surface. Binding of collagen VI with the cell membrane was mediated by NG2 proteoglycan, as demonstrated by in vitro perturbation of collagen VI-NG2 interaction with a NG2-blocking antibody.Cultures subjected to wound healing scratch assay displayed collagen VI-NG2 complexes at the trailing edge of migrating cells, suggesting a potential role in cell migration. In fact, the addition of a NG2-blocking antibody led to an impairment of cell polarization and delay of wound closure. Similar results were obtained after in vitro perturbation of collagen VI extracellular assembly with the 3C4 anti-collagen VI antibody and in collagen VI-deficient tendon cultures of a Ullrich congenital muscular dystrophy patient carrying mutations in COL6A2 gene.Moreover, in vitro treatment with transforming growth factor β1 (TGFβ1) induced a dramatic reduction of NG2 expression, both at protein and mRNA transcript level, and the impairment of collagen VI association with the cell membrane. Instead, collagen VI was still detectable in the extracellular matrix in association with ED-A fibronectin and collagen I, which were strongly induced by TGFβ1 treatment.Our findings reveal a critical role of the NG2 proteoglycan for the binding of collagen VI to the surface of tendon fibroblasts. By interacting with NG2 proteoglycan and other extracellular matrix proteins, collagen VI regulates fibroblasts behavior and the assembly of tendon matrix, thereby playing a crucial role in tendon repair.
KW - Cell migration
KW - Collagen VI
KW - NG2 proteoglycan
KW - Tendon repair
KW - Transforming growth factor β1
UR - http://www.scopus.com/inward/record.url?scp=84960156535&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84960156535&partnerID=8YFLogxK
U2 - 10.1016/j.matbio.2016.02.012
DO - 10.1016/j.matbio.2016.02.012
M3 - Article
JO - Matrix Biology
JF - Matrix Biology
SN - 0945-053X
ER -