- Research article
- Open Access
Elevated levels of β-catenin and fibronectin in three-dimensional collagen cultures of Dupuytren's disease cells are regulated by tension in vitro
BMC Musculoskeletal Disorders volume 4, Article number: 16 (2003)
Dupuytren's contracture or disease (DD) is a fibro-proliferative disease of the hand that results in the development of scar-like, collagen-rich disease cords within specific palmar fascia bands. Although the molecular pathology of DD is unknown, recent evidence suggests that β-catenin may play a role. In this study, collagen matrix cultures of primary disease fibroblasts show enhanced contraction and isometric tension-dependent changes in β-catenin and fibronectin levels.
Western blots of β-catenin and fibronectin levels were determined for control and disease primary cell cultures grown within stressed- and attached-collagen matrices. Collagen contraction was quantified, and immunocytochemistry analysis of filamentous actin performed.
Disease cells exhibited enhanced collagen contraction activity compared to control cells. Alterations in isometric tension of collagen matrices triggered dramatic changes in β-catenin and fibronectin levels, including a transient increase in β-catenin levels within disease cells, while fibronectin levels steadily decreased to levels below those seen in normal cell cultures. In contrast, both fibronectin and β-catenin levels increased in attached collagen-matrix cultures of disease cells, while control cultures showed only increases in fibronectin levels. Immunocytochemistry analysis also revealed extensive filamentous actin networks in disease cells, and enhanced attachment and spreading of disease cell in collagen matrices.
Three-dimensional collagen matrix cultures of primary disease cell lines are more contractile and express a more extensive filamentous actin network than patient-matched control cultures. The elevated levels of β-catenin and Fn seen in collagen matrix cultures of disease fibroblasts can be regulated by changes in isometric tension.
Dupuytren's contracture or disease (DD) is a benign, but debilitating fibro-proliferative disease of the palmar fascia  that causes permanent flexion of the affected fingers . Clinically, DD progresses through distinct stages with the earliest stage of the disease characterized by the appearance of small nodules of hyperproliferative cells that give rise to scar-like, collagen-rich disease cords (Fig 1).
In spite of numerous studies over the years, the etiology of this disease remains obscure. However, DD does display several features of a cancer, including high rates of recurrence following surgery, distinct chromosomal abnormalities [3–7], and increased total and cancer mortality rates among men with established disease [8, 9]. This notion is further supported by studies from our labs and others that show aberrant expression of β-catenin, a key cell signalling molecule frequently mutated in human cancers [10, 11], in DD [12, 13], including several related fibromatoses [14–18]. Additional studies from our laboratories also suggest that β-catenin may play an important role in cutaneous wound healing .
β-catenin was first identified as a component of cell-cell adhesion structures (adherens junctions) that physically couples cadherins to the cytoskeleton via α-catenin (Fig. 2) [20–22]. It is also a key signalling factor within the canonical Wnt pathway , which is involved in growth and development of numerous cell types . In the canonical Wnt pathway (Wnt/β-catenin), these secreted ligands bind to receptor complexes, consisting of a Frizzled (Fz) receptor and a low-density lipoprotein receptor-related protein (LRP) [24–27]. Upon Wnt stimulation glycogen synthase kinase-3β (GSK-3β) catalyzed phosphorylation of β-catenin is inhibited resulting in an increase in the 'free' (uncomplexed to cadherin) cytosolic levels of β-catenin. This in turn leads to its subsequent accumulation within the nucleus, where it binds to members of the Tcf/Lef (T-cell factor-lymphoid enhancer factor) transcription factor family [28, 29] to regulate gene expression [30–34].
Alterations in the extracellular matrix (ECM) are another important clinical feature of DD. Disease cords are largely composed of collagen type I, and have elevated levels of collagen type III compared to normal palmar fascia tissue [35–38]. Fibronectin (Fn), a well known extracellular glycoprotein that plays a vital role in numerous cell functions, including adhesion, proliferation, migration, and differentiation , is also prominently expressed in DD lesions, most notably within extracellular plaques, termed fibronexus, that are closely associated with DD myofibroblasts . To-date, various Fn isoforms and their post-translational modified forms (ED-A, ED-B, oncofetal Fn), which are typically associated with tissues undergoing extensive proliferation and remodelling, have been documented in DD [41, 42]. Recent studies in our lab have also documented aberrant expression of oncofetal Fn in primary cultures of DD lesions compared to patient-matched control fascia derived primary cultures (Varallo et al. unpublished). Although the importance of oncofetal production by DD cells are not clear the ability of these cells to actively modify the composition of the ECM appears to facilitate collagen contraction in vitro (Fig. 3) . Nevertheless, the exact roles that these Fn isoforms, or indeed other ECM components play in the pathogenesis of DD is not known.
In light of the potential role of β-catenin in the pathogenesis of DD  and the importance of ECM in DD, we examined both β-catenin and Fn levels in relation to mechanical stress, using Fibroblast Populated Collagen Lattice (FPCL) cultures of patient-matched normal and disease primary cell lines. Recent studies from our labs have shown that FPCL cultures of primary disease cell lines have significantly elevated levels of β-catenin compared to control FPCL cultures , suggesting that tension and the surrounding ECM may be important factors regulating β-catenin expression in DD. This is an intriguing possibility since tension and the ECM are important clinical factors in DD [36, 37, 44–46]. Experiments described here examined β-catenin and Fn levels as a function of changes in isometric tension. The phenotypic differences between control and disease cell cultures reported here suggest that the FPCL culture system may be a good in vitro model to explore disease-specific changes in cell function.
Clinical specimens and primary cultures
Surgical specimen were collected in strict compliance with the Institute's chief pathologist and the ethics committee for research involving human subjects at UWO. Briefly, diseased fascia (cords) and adjacent, uninvolved (control) palmar fascia tissue was collected and divided in two portions for protein analysis (immediately stored -80°C) and primary cell cultures. For explant cultures, fascia specimen were finely minced and placed in starter media consisting of α-MEM (Gibco, Invitrogen Corporation, Grand Island, NY) containing 20% fetal bovine serum (FBS, Clontech Laboratories, Palo Alto, CA) and antibiotics (Penicillin G + streptomycin sulfate, Gibco, Invitrogen Corporation, Grand Island, NY). Established primary cell culture lines were maintained in α-MEM containing 10% FBS and antibiotics. Culture flasks were incubated at 37°C in a humidified chambers with 5% CO2. Medium was changed every 4–5 days and the cells were sub-cultured using 0.05% Trypsin-EDTA (Gibco, Invitrogen Corporation, Grand Island, NY) when confluent.
FPCL contraction assay
Collagen contraction assays were carried out using disease (D) and control (C) primary cell cultures established from lesional and adjacent normal (uninvolved) fascia from the same patient (i.e. patient-matched), respectively. Primary cultures (passages 4–6) were grown as three dimensional Fibroblast Populated Collagen Lattices, or FPCL (Fig. 3). Collagen lattices were prepared by mixing cells with a neutralized solution of collagen type I (8 parts Vitrogen100 collagen type I, 2.9 mg/ml, Collagen Corp, Santa Clara, CA, USA + 1 part 10x α-MEM + 1 part HEPES buffer, pH 9). Final collagen and cell concentrations for the FPCL were 2.0 mg/ml and 2 × 105 cells/ml of matrix, respectively. The cell-collagen mixture was then aliquoted into 24 well culture dishes (0.5 ml/well) that were pre-treated with a PBS + 2% BSA solution. Once polymerized (1 hr, 37°C) α-MEM + 10% fetal calf serum (FCS) was added atop FPCLs in each well. After 2 days of incubation, the attached FPCL were mechanically released from the sides of the culture plates. Digital images of the contracting FPCL were captured at various time points over 5 days using a conventional flatbed scanner. Collagen lattice areas were then measured using NIH imaging software.
FPCL were harvested at various post-mechanical released time points, homogenized and protein extracts prepared using a modified RIPA buffer (50 mM Tris-HCl (pH 7.4), 1% NP-40, 150 mM NaCl, 1 mM EDTA) supplemented with a cocktail of protease inhibitors (1 mM PMSF, 1 μg/ml of aprotinin, leupeptin, pepstatin) and phosphatase inhibitors (1 mM Na3VO4, 1 mM NaF) (Sigma, St. Louis MO, USA). The resulting FPCL homogenate was then centrifuged (15 min, 4°C 12,000 × g) to remove cell debris. Cells numbers were quantified using an in vitro toxicology assay kit based on lactic dehydrogenase (LDH) levels (Sigma, St. Louis MO, USA), according to the manufacturers instructions. Equivalent cellular protein levels were then analyzed by SDS-PAGE (12%) and subsequently transferred to polyvinylidene difuoride (PVDF) membranes (BioRad, Hercules CA, USA). Membranes were blocked overnight (4°C) with a PBS solution containing 0.1% Tween 20 (PBST) and 5% fat free skim milk, washed 2x in PBST, and then sequentially probed with anti-β-catenin (1:750, Transduction Laboratories, Lexington, KY, USA), anti-Fn (clone IST-4, 1:500, Sigma, St. Louis MO, USA), and anti-heat shock protein 47 (Hsp47) antibodies (1:500, StressGen, Victoria BC, Canada). After a brief series of PBS washes membranes were then incubated with the horseradish peroxidase (HRP) conjugated 2° antibodies (1:5000, Jackson ImmunoResearch, West Grove PA, USA) for 45 min. at room temperature (RT). Antibody-specific bands were visualized using enhanced chemiluminescence (ECL) reagents and Kodak XLS film (Rochester NY, USA). Antibody-specific bands for β-catenin, fibronectin and Hsp47 were quantified using NIH Imaging software. Both β-catenin and fibronectin levels were normalized to control Hsp47 levels by calculating the appropriate ratio values (i.e. β-catenin:Hsp47, and Fn:Hsp47). The plotted bar graph values therefore represent the mean ratio intensity ± SEM per time point. For attached-matrix experiments, harvested FPCLs were treated as described above except that they were not mechanically released from the sides of the dishes throughout the 5 day incubation period.
Immunocytochemistry analysis of FPCL cultures
Individual lattices were briefly washed in PBS, fixed with 4% paraformaldehyde (Electron Microscopy Sciences, Ft. Washington PA, USA) for 1 hr at room temperature (RT), permeabilized in PBS + 0.5%Tween (PBST) for 15 min at RT, and then blocked overnight at 4°C with PBS + 2% donkey serum (Jackson ImmunoResearch, West Grove PA, USA). Lattices were then incubated with the nucleic acid stain DAPI (4',6-diamidino-2-phenylindole, dihydrochloride, Molecular Probes, Eugene ON, USA) for 20 min at RT, and then stained for 20 min at RT with phalloidin-Alexa 488 (Molecular Probes, Eugene ON, USA). The lattices were then briefly washed in PBS and mounted onto glass slides using aqueous DAKO faramount mounting media (DAKO Diagnostics, Carpinteria CA, USA). Digital images were acquired on a Nikon eclipse TE-200 inverted fluorescent microscope using a Photometrics series 300 cooled CCD camera, and deconvolved using softWoRx (v 2.5) software (Applied Precision Inc., Issaquah WA, USA).
Results and Discussion
FPCL cultures of DD primary cell lines not only provides a functional assay to quantify cell-mediated collagen contraction events, but also an 'in vivo-like' environment (i.e. three-dimensional collagen-rich matrix environment) to study cell-matrix interactions. Primary cell lines established from patient-matched disease fascia and adjacent uninvolved normal fascia tissue (n = 5 patient) were cultured as 'stressed-matrices' (Fig. 3). Following 2 days of attached-culture FPCLs were mechanically released from the sides of the culture dishes and digital images of the contracting gels collected over a 5 day incubation period. As shown in Fig. 4, area measurements of the contracting FPCL for all five patient-matched primary cell lines show that the disease cell cultures contracted collagen significantly more between 30 min. and 5 days compared to control FPCLs (*P < 0.05, student T-test). The differences in contraction rates is consistent with a number of earlier FPCL studies that demonstrated enhanced contractile activity of fibroblasts derived from DD lesions [47–49]. However, these studies utilized carpal tunnel fibroblasts as control cells and often used a floating-matrix rather than stressed-matrix contraction model to quantify cell-mediated collagen contraction, thus making it difficult to directly compare results.
Stressed-collagen lattices stained with phalloidin-Alexa 488, a fluorescent probe that binds filamentous actin, revealed more prominent stress fiber networks in the disease FPCLs compared to control FPCLs (Fig. 5), suggesting that the disease cells may be more inherently responsive to factors that promote collagen contraction. Although the exact nature of the cell signalling networks responsible for the enhanced contractile activity of the disease cells is unclear (e.g. cell-ECM interactions, growth factor pathways), the three-dimensional collagen matrix environment appears to differentially regulate the activity of the control and disease cells.
Western analysis of stressed and attached FPCLs
Since β-catenin is aberrantly expressed in vivo and in vitro (FPCL cultures) in DD , we examined its levels in relation to changes in mechanical stress (stressed- or attached-matrices). Fibronectin (Fn) levels were also examined since it plays an important role in cell-collagen interactions [43, 50, 51], and the regulation and function of β-catenin [52, 53]. During the contraction of stressed-FPCLs β-catenin levels transiently increased in disease cells, peaking at 1 hr post-mechanical release (R1, Dis/ctrl ratio = 3.6) and decreasing thereafter to levels equivalent to, or below those seen in control FPCLs, while in control matrix cultures β-catenin levels did not significantly change throughout the incubation period (Fig. 6). By contrast, Fn levels in disease FPCLs (R0, Dis/ctrl ratio = 2.7) steadily decreased upon mechanical release of the matrices, while Fn levels in control lattices showed a slight increase during contraction (Fig. 6).
While the observed decline in Fn levels in the disease FPCLs is consistent with previous studies that show disassemble of cellular Fn fibrils upon loss of isometric tension [54, 55], the lack of change in Fn levels in the contracting control FPCLs is unclear. Nevertheless it is conceivable that the differences between the disease and normal fibroblasts with respect to stress-induced changes in Fn may simply reflect the disease-specific nature of these cells since Fn is a gene target of the β-catenin/Lef-Tcf transcriptional complex . Considering that Fn can stimulate β-catenin nuclear accumulation via ILK (integrin-linked kinase) , and ILK itself can up-regulate Fn matrix assembly , it is possible that both β-catenin and Fn may share a common pathway within these cells. Although the mechanism responsible for the tension-dependent decrease in β-catenin is not clear it may also be related to the non-proliferative state of relaxed or floating FPCL cultures (Fig. 3) .
To further explore β-catenin and its relation to mechanical stress, we also analyzed β-catenin levels within attached-matrix (see Fig. 3) FPCL cultures. As shown in Fig. 7, western analysis of attached-matrices showed an accumulation of β-catenin in the disease cells over time, relative to control Hsp47 levels, while β-catenin levels remain relatively unchanged in the control cells. Although Fn levels in both control and disease cultures increased over the incubation period, Fn levels accumulated much faster within the disease FPCLs compared to control FPCL cultures (Fig. 7). Although the exact mechanism responsible for the tension stimulated accumulation of β-catenin is not clear it may be related to proliferative nature of attached-matrix cultures .
Immunocytochemistry analysis of attached FPCLs
Given that Fn levels increase much earlier in the disease FPCL cultures, and that Fn matrix can regulate β-catenin levels, it is possible that disease cell cultures develop a peri-cellular Fn matrix (fibronexus) much earlier, and perhaps to a much greater extent, than control cells. Since previous studies have shown that the formation of filamentous actin (F-actin) networks parallels Fn matrix assembly , we probed FPCLs for F-actin expression using phalloidin-Alexa 488. Immunocytochemistry (ICC) analysis shows that the disease cells form extensive stress-fibres Fig. 5 and attach and spread within the collagen matrix much earlier than control cells Fig. 8, suggesting that the disease cells form a Fn matrix much earlier than control cells within attached-matrix cultures. While it is not clear whether β-catenin up regulates cellular Fn production, and/or cellular Fn stimulates increased β-catenin stability, it does appear that this altered metabolic state of the disease cells promotes cell-collagen attachment and cell-mediated collagen contraction. The build-up of isometric tension within the FPCL cultures likely accelerated this process since isometric tension can directly modulate cell signalling events important to fibroblast contractility , as well as stimulate the expression of contractile markers such as Fn and α-SM actin in vivo . Moreover, the well recognized role that integrins (cell-ECM receptors) play in helping to generate isometric tension and Fn matrix assembly [51, 61], suggests that integrin-mediated signalling factors, like ILK, may provide a possible mechano-chemical pathway linking isometric tension with changes in the β-catenin and Fn levels. Nevertheless, the possible relationship between β-catenin, Fn, ILK and other signalling factors remains to be examined.
In this study, we have shown that primary cell cultures derived from DD lesions display a number of phenotypic differences when compared to patient-matched normal fascia primary cultures. FPCL and ICC analysis shows that DD cells are more contractile than control cells due, in part, to an enhanced filamentous actin network. Western analysis of disease and normal FPCLs show markedly elevated levels of β-catenin and Fn expression in disease cell lattices that are sensitive to changes in isometric tension. More specifically, in disease cultures β-catenin and Fn expression levels decrease dramatically when isometric tension is reduced, while continued culture under stress (attached FPCLs) stimulates increases in both Fn and β-catenin levels. ICC analysis also suggests that disease cells attach and spread more quickly in attached matrix cultures, and form more extensive F-actin networks than control cultures.
The clinical importance of tension in wound-scar formation  and postoperative management of DD patients , coupled with the tension-dependent changes in β-catenin levels observed in this study, suggests a possible mechano-chemical link between the aberrant expression of β-catenin in DD lesions  and tension-induced scar formations in fibro-proliferative disorders like DD. While the exact role of β-catenin in the patho-mechanisms of DD is unclear, future studies will be focussed on the relations between tension, β-catenin and the ECM.
fibroblast populated collagen matrix
phosphate buffered saline
wg (Wingless) + int-1 (integration site 1 of mouse mammary tumor virus)
heat shock protein of 47 kDa
- DAPI – 4':
low-density lipoprotein receptor-related protein
1 – wnt-interacting protein
secreted frizzled related proteins
GSK-3β Binding Protein
casein kinase I
glycogen synthase kinase-3β
T-cell factor-lymphoid enhancer factor
adenomatous polyposis coli gene
integrin linked kinase
sodium dodecyl sulphate polyacrylamide gel electrophoresis
PBS + Tween 20
horseradish peroxidase. RT – room temperature
alpha-minimal essential medium
fetal calf serum
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The pre-publication history for this paper can be accessed here:http://www.biomedcentral.com/1471-2474/4/16/prepub
This study was supported by grants from the Canadian Institutes of Health Research (BSG, JCH, BA), Plastic Surgery Education Fund (BSG, JCH), Canadian Orthopaedic Foundation (JHR, JCH, BSG), American Society for Surgery of the Hand (DCR, JHR, JCH, BSG) and the Lawson Health Research Institute's Internal Research Fund (JCH, BSG).
VMV carried out the FPCL experiments and western blots. BSG, DCR, JHR and KJF provided the clinical material used to establish primary cultures and participated in interpretation of results. BA participated in the design of the study. JCH and BSG conceived the studies, participated in the design and co-ordination of the study, analysed and interpreted the results and drafted the manuscript. All authors read and approved the final manuscript.
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Howard, J.C., Varallo, V.M., Ross, D.C. et al. Elevated levels of β-catenin and fibronectin in three-dimensional collagen cultures of Dupuytren's disease cells are regulated by tension in vitro . BMC Musculoskelet Disord 4, 16 (2003). https://doi.org/10.1186/1471-2474-4-16
- Disease Cell
- Isometric Tension
- Palmar Fascia
- Collagen Contraction
- Fibronectin Level