Abstract
Dupuytren’s disease is a connective tissue disorder of the hand causing excessive palmar fascial fibrosis with associated finger contracture and disability. The aetiology of the disease is heterogeneous, with both genetic and environmental components. The connective tissue is abnormally infiltrated by myofibroblasts that deposit collagen and other extracellular matrix proteins. We describe the clinical profile of Dupuytren’s disease along with current therapeutic schemes. Recent findings on molecular and cellular parameters that are dysregulated in Dupuytren’s disease, which may contribute to the onset of the disease, and the role of resident inflammation promoting fibrosis, are highlighted. We review recent literature focusing on non-myofibroblast cell types (stem cell-like cells), their pro-inflammatory and pro-fibrotic role that may account for abnormal wound healing response.
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Introduction
Wound repair and tissue regeneration after injury is widely accepted to occur during the adult life of large mammals. In humans, liver regeneration after partial hepatectomy [1] or gum regeneration [2] is a complete and restorative process. However, skin wounds, incisions or excisions lead to formation of scar tissue, which does not resolve for a long term, thus, the cell-mediated tissue regeneration is incomplete while scar tissue persists. Embryonic skin wounds lead to scar-free, completely regenerated tissues, while the majority of mechanical injuries during adult life lead to scar tissue formation [3]. Thus, there might exist a “co-dependent” link between tissue regeneration, cell replenishment and scarring. The early phases of the wound healing response are dependent on inflammation and fibrogenesis, recruitment of platelets, immune cell and fibroblast invasion, pro-inflammatory cytokine secretion, differentiation of fibroblasts to myofibroblasts and fibrin clot formation. If the damaging stimuli are repetitive, this will lead to persistent inflammation; higher levels of interleukins, tumor necrosis factor alpha (TNFα) and pro-fibrogenic transforming growth factor beta (TGFβ) and therefore scarring. It has been proposed that the same signals that regulate scar-free embryonic regeneration also regulate the adult wound healing response. These cellular processes might be controlled by the levels and/or localization of those same signals as well as of the (extra)cellular context, developmental stage, tissue specificity and repetitive versus acute injury.
In the case of Dupuytren’s disease (DD), although it is not clear whether its pathogenesis is of mechanical or biochemical nature, the net result is the same: excess production of matrix proteins and excessive accumulation of extracellular matrix (scarring) which changes tissue architecture and causes digital contraction. Perhaps we should re-evaluate DD not only as excess scarring but also as a condition of abnormal tissue regeneration.
In this review, we will discuss the recent research findings on DD focusing on the role of non-fibroblastic cell populations (immune cells, vascular cells or potential stem/progenitor cells).
Clinical Problems of DD and Current Therapeutic Possibilities
Dupuytren’s disease typically presents in the fourth and fifth decade of life with thickening and nodule formation of the affected fascial structures in the hand (Fig. 1a) [4].
Disease progression leads to longitudinally oriented cord-like structures that limit extension of the involved fingers and ultimately to metacarpophalangeal (MCP) and interphalangeal joint (PIP or DIP) contractures [5]. Younger patients often have a more aggressive disease progression. Most patients with a first presentation of DD do not have pain or functional disability and require no treatment. A small extension deficit of the MCP joints might lead to a positive “tabletop test” (the hand cannot lie flat on a tabletop), but few patients experience functional limitations. The indications for treatment are governed by functional loss and progression and may be subject to local healthcare system guidelines. An extension deficit greater than 30° may lead to contracture of the accessory collateral ligaments and the palmar plate of the PIP joint. PIP joint contractures are generally regarded as more difficult to treat than MCP contractures because of the secondary joint contracture and weakening of the extensor mechanism caused by palmar fibrosis.
A wide range of treatment options are available [6] generally involving mechanical release or excision of excessive fibrotic tissue. However, recurrence rates are high, ranging from 8 to 66 % (average 33 %) [7]. The surgeon and patient should be aware that there is no curative treatment for the disease.
Non-operative Treatment
Non-operative treatments such as physiotherapy, splinting and local radiotherapy may affect disease progression, but long-term efficacy is unclear.
Minimally Invasive (Percutaneous) Treatment
Minimally invasive (or percutaneous) techniques have become more popular as can be performed in the outpatient setting. Principally, they involve either collagenase injections or needle fasciotomy. The goal is to rupture palpable cords causing digital flexion contracture. Local triamcinolone acetonide injections do not release DD contractures.
Collagenase is an enzyme solution (derived from Clostridium histolyticum), which is injected directly into the DD cord. The cord will weaken due to enzymatic digestion and rupture when manipulated over the next few days. This technique (FDA-approved [8]) tends to be effective for MCP contractures, though with certain complications, and is considered a promising alternative for less severe contractures. It is shown to be of particular value in MCP contractures [9]. However, recurrences are reported and complications of oedema, tendon rupture, pain and lymphadenopathy are described [5].
Percutaneous needle fasciotomy has been popularized in recent decades. Cutting the cord with a needle is effective for solitary central cords in the palm of the hand to release MCP contractures. More distal, the effectiveness of the release decreases and the risk of iatrogenic neurovascular damage increases. Also, high recurrence rates up to 60 % within 3 years are reported [10]. These less invasive techniques may be a useful tool in the sicker patients with co-morbidities who cannot undergo surgery or in those who want immediate improvement.
Surgical Techniques
Surgical excision of diseased tissue is called fasciectomy and can vary from limited to radical excision. For skin incisions, there are multiple options ranging from midline Y-V advancement flaps, Z-plasties and zigzag (Bruner-type) incisions [11]. Radical fasciectomy has high complication rate without a significantly decreased recurrence rate. Dermofasciectomy involves removal of the diseased fascia including the overlying skin. This technique, if used radically, may reduce long-term recurrence rates. Smaller or “firebreak” skin grafts probably do not improve recurrence rates over fasciectomy alone. Partial fasciectomy is considered the gold standard of surgical treatment for functionally disabling DD [11].
After removal of the diseased tissue (fasciectomy), additional procedures might be necessary to correct capsular joint contractures (PIP joint capsulolysis) or to reconstruct a skin defect (local skinflap or graft). Postoperative splinting of the hand may not improve medium-term outcome [5]. Complications of open surgery include delayed wound healing, skin flap necrosis, digital nerve and vessel injury, joint stiffness, hematoma and pain issues [12]. Complex regional pain syndrome (CRPS) can be a devastating complication of surgery prolonging recovery and requiring long-term hand therapy support and chronic pain treatments [13].
Molecular and Cellular Alterations in DD Degeneration
The main characteristic of DD is accumulation of extracellular matrix proteins, which form an abnormal connective tissue of the palmar fascia mainly containing collagen (mostly collagen type I and type III) and myofibroblasts [14]. Several studies have implicated the TGFβ and WNT pathways as drivers of fibrosis in DD (reviewed in [15–17]). Expression analyses in DD (by e.g. microarray or q-RT-PCR) [18–27] have shown that these key pathways are indeed modulated, but do not always yield the same results: either different set of hits or different mode of expression (downregulation versus upregulation). Considering the heterogeneity among individuals and additional factors including biopsy material or comparison with carpal tunnel-derived fascia palmaris or “normal” adjacent tissue from DD patients, as well as the derivation of tissue fibroblasts, there is high variability in the outcomes.
A recent genome-wide analysis study using exon arrays indicated a variety of genes that are differentially expressed in DD patient fibroblasts compared with control (thigh skin punch form unaffected individuals) fibroblasts [28]. Among the list of genes are ECM and tissue re-modelling genes suggesting aberrant matrix synthesis and turnover. Top hits are the matrix metalloproteinase-1 (MMP-1), MMP-3 and MMP-16, which have decreased expression in DD fibroblasts, though other studies have implicated MMP-2 and MMP-14 [29]. MMP-1, MMP-14 and to some extend MMP-2 are collagen-degrading enzymes, whilst MMP-3 and MMP-16 activate such enzymes. ADAM15, ADAMTS10, ADAMTS2 and ADAMTS3 showed increased expression in DD patient samples. ADAMTS2 and ADAMTS3 are procollagen propeptidases, involved in collagen biosynthesis. More than 20 collagen genes showed upregulated expression in DD especially those of the COL1, COL3, COL4 and COL5 cluster.
Regulation of cell surface proteins involved in interaction with ECM, such as the integrin family, is disrupted, showing either significantly higher (ITGA11) or lower expression (ITGA2, ITGA6 and ITGA4). Members of the TGFβ and WNT pathway are also dysregulated e.g. follistatin, BMP4, inhibin subunit INHBA, WNT2, frizzled 4, and RSPO3. A previous genome-wide association study has shown several genes of the WNT signalling pathway to be dysregulated (WNT2, WNT4, WNT7B, RSPO2, SFRP4, SULF1) [27]. Further characterization has indicated decreased WNT2 and increased b-catenin and WNT7B in the DD nodules along with increased ACTA2 (α-smooth muscle actin, a myofibroblast marker) and COL1A1 and COL3A1 expression [30••].
Novel players have been implicated in the pathogenesis of DD such as Wilm’s tumour protein-1 (WT1) [31•] and YAP [32•]. YAP1, a member of the Hippo pathway, which has recently been shown to promote differentiation of fibroblasts into myofibroblasts, potentially acts downstream of TGFβ [32•].
microRNAs (miRNAs) are implicated in many biological processes and have been associated with several diseases; however, few studies have investigated the potential role of miRNAs in DD fibrosis. The first microarray studies identified unique profiles of miRNAs in control versus DD fascia palmaris [33, 34]. Mosakhani et al. reported that some miRNAs (e.g. miR29-C, miR29-130b, miR29-101) are predicted to regulate both the WNT and TGFβ pathways [34]. RNA sequencing analysis of DD and the control fascia material shows a unique enrichment of over 70 miRNAs in the DD and a distinct, smaller subset enriched in control fascia [35]. Target prediction analysis indicated that anti-fibrotic miRNAs targeting collagen mRNAs, which are present in the normal fascia, are in fact depleted in DD patient material [35]. Thus, these studies add to our understanding of DD pathogenesis.
Inflammation and Fibrosis
The majority of knowledge on aspects of the wound healing response has derived by studies of acute skin injuries. Resident and inflammatory cells (e.g. mast cells, leukocytes) release growth factors, proteases and prostaglandins that are essential for removal of damaged epithelial cells, protection from infectious factors and activation of fibroblasts into myofibroblasts that form the fibrous scar tissue and have mechanical properties to mediate wound closure. Although acute tissue injury is resolved completely, repetitive chronic injury, the addition of other factors such as age or diabetes or chronic inflammation have the potential to interfere with the correct remodelling of tissue and are contributing factors to persistent scarring (e.g. hypertrophic scars) [36, 37]. For instance, macrophage and leukocyte-depleted transgenic mice (PU.1 null) have rapid skin wound repair with reduced fibrosis [38]. The mechanism by which inflammation influences fibrosis remains elusive. Similarly to skin wound repair, connective tissue diseases such as DD or Peyronie’s disease are likely to be affected by inflammation. Despite the first study that reported macrophages and leukocytes around the DD nodules [39], the role of immune cells in DD fibrosis had not been characterized until recently. A limitation that accounts for this was the overlapping recognition of fibroblasts by anti-macrophage antibodies (Mac-3, CD68, MHC class II, CD45), which may have led to misidentification of pure fibroblast and macrophage cell populations [40].
High levels of inflammatory cytokines were detected in tissue from DD patients along with CD68+ monocytes and classically activated M1 (pro-inflammatory) and alternatively activated M2 (regenerative) macrophages [41]. The same study showed that pro-inflammatory factor TNFα promotes DD fibrosis, although IL-6 and IL-1b did not have the same effect, via activation of WNT signalling [41]. Bianchi et al. have also reported increased expression of IL-6 and IL-1b cytokines in DD as well as presence of CD68-positive cells [42]. The pro-fibrogenic factor TGFβ, released by platelets, fibroblasts and macrophages, also mediates inflammation-related signalling (such as p38 activation) also in DD fibroblasts [45, 44].
Our unpublished observations demonstrate the presence of a small number of immune cell types (leukocytes, monocytes, B and T cells) residing in nodules from DD patient material (Fig. 1b). Immunofluorescence of fixed material immediately after surgical removal of nodules confirmed the presence of CD3-positive T cells along with CD68-positive macrophages (Fig. 1c) similar to the study of Verjee et al. In addition, we detected tryptase, a well-known specific alpha marker of mast cells (Fig. 1c). Mast cells are granulated tissue-resident cells of the innate immunity, best known for their involvement in allergic disorders, but also playing a role in several autoimmune conditions [45], where they can have both pro- and anti-inflammatory/immunomodulatory effects [46, 47]. In the context of Dupuytren’s inflammation, mast cell activation could contribute to the modulation of the inflammatory response leading to fibrosis. For example, tryptase-initiated signalling influences neutrophil and monocyte recruitment, muscle tissue regeneration [48], fibroblast proliferation [49, 50] and activation of latent TGFβ [51]. Interestingly, the number of mast cells has been shown to be increased in Dupuytren’s contracture in comparison with normal fascia tissue [52]. Inhibition of mediator release by the mast cell stabilizer compound chromolyn (chromoglicic acid) is used as anti-allergy treatment for asthma, conjunctivitis and food allergies [53]. As a proof of principle, we tested the effect of inhibition of mast cells ex vivo and their potential influence upon fibroblasts on our ex vivo human tissue culture method [54••, 55]. We have exposed DD nodule-derived slices to chromolyn for 72 h; our preliminary data suggest a decrease in tryptase and alpha smooth muscle actin (αSMA) expression (Fig. 1d). Co-labelling of CD68 and αSMA in DD specimens indicates the presence of macrophages around the microvessel clusters (Fig. 1e, left panel), while ex vivo treatment of tissue with neutralizing TNFα antibody (golimumab) has little effect at the lowest concentration (1 μg/ml) but leads to reduced CD68 expression when used at a higher concentration (10 μg/ml).
A recent study has characterized the immune response in a large subset of DD specimens and, similar to our unpublished observations, has detected the infiltration of DD tissue by several immune cells. After extensive characterization of T cells and cytokine profiling, the authors suggest that T cells may contribute to the development of DD possibly via (auto)antigen-driven processes possibly due to microvascular damage [56••].
Overall, the fibrotic response in DD is being recognized as an immune-mediated response, with an important involvement of different immune cells. Our preliminary observations suggest that mast cells could also be involved in the inflammatory response leading to the development of fibrosis, an intriguing observation warranting additional investigations on the role of mast cells and other immune cells in DD.
Contribution of Stem/Progenitor Cells in DD
The field of DD research is mainly focused on the mechanisms of deregulated proliferation of myofibroblasts and their matrix-producing properties. However, this may be at the end stage of the disease and not necessarily during its onset. The switch to excessive fibrosis may be indeed controlled by other cell types such as the infiltrating immune cells, vascular smooth cells, endothelial cells, pericytes [57], fibrocytes originating from the bone marrow or possibly multilineage progenitors that give rise to myofibroblasts [58] (mesenchymal stem/stromal cells). Pericytes, the endothelium-covering cells, have been attributed with stem cell properties in several organs [59], which is likely to be the case also in DD fibrosis. Vessel structures that contain high levels of laminins, a key basal membrane component of the connective tissue, facilitate proliferation of myofibroblasts evident by proliferating centres in the vicinity of these vessels [60••]. Endothelial cell and mesenchymal stem cell (MSC)-enriched protein CD105 (type III receptor, endoglin) has been found to be expressed near these proliferation centres. Vessel structures in DD specimens appear abnormally large or with fused vessels and are located distinctly from the myofibroblast-enriched area. It is highly likely that these structures are sweat glands from subcutaneous dermis that seem to be encapsulated within the fibrotic nodules as also suggested by Viil et al. The presence of stem cells has been reported in the vicinity of cutaneous sweat glands [61]; thus, we hypothesize that similar stem/progenitor cell populations may exist in DD. Given the high proliferative properties of these myofibroblasts, such an assumption seems probable; however, detailed investigations are needed.
Cell replacement treatments using MSCs for organ fibrosis, such as liver [62], lung [63] or heart [64], have been attempted in many studies in order to improve cell replenishment and tissue regeneration. MSCs are multipotent stromal cells which differentiate into distinct cell lineages: osteoblasts, chondrocytes, adipose cells, muscle cells as well as tenocytes, skin cells and differentiated stromal cells of connective tissue (fibroblast phenotype) [65]. However, the ability of MSCs to give rise to fibroblasts is often overlooked, along with the subsequent effects on exacerbating instead of ameliorating fibrosis. MSCs may differentiate into highly specified fibroblastic populations such as inflammatory fibroblasts or myeloid fibroblasts. In DD, palmar fascia tissue recent studies have reported and characterized the presence of resident MSCs or adipose stem cells [66••, 67••], or a stem cell-like subpopulation of Thy1 (CD90)-positive cells has been identified [68••]. Cell-cell contact of DD myofibroblasts with adipose stem cells resulted in inhibition of contractility and smooth muscle actin expression of myofibroblasts [69••]. A recent study has identified an increased resident and circulating fibrocyte population in DD tissue compared to control tissue [70••]. Fibrocyte characterization showed that these cells are of the mononuclear cell lineages sharing properties with fibroblasts and mesenschymal stromal cells (CD45RO, 25F9 and MRP8/14). Treament of fibrocytes with serum amyloid P and FDA-approved Xiapex collagenase inhibited the expansion of fibrocytes in vitro, a promising finding regarding the extended use of Xiapex [70••].
Conclusions
In this review, we have discussed the clinical problems associated with DD and the current therapeutic tools currently available. In addition, we have reviewed recent publications on studies regarding novel regulator genes or cellular processes involved in DD pathogenesis. We have discussed how fibrosis and tissue regeneration are inter-dependent processes, for instance deregulated tissue regeneration or “re-cellularization” leads to overstimulation of fibrosis. One of the underlying factors regulating fibrosis and regeneration is inflammation, while the role of inflammation in DD is only beginning to be unravelled. The latest research studies introduce the possibility that DD may be an autoimmune disease, which however requires more investigation. Given the high demand for safe and effective anti-fibrotic drugs for DD, we propose that novel compounds that inhibit both myofibroblasts and immune cells (mast, B and T cells) or a combination of anti-fibrotic and anti-inflammatory compounds are promising candidates. From a different point of view, we discuss the possibility of resident stem/progenitor cells to be a pool for myofibroblasts or inhibit their fibrogenic activity based on recent publications. The potential of MSC differentiation to the fibroblast lineage or stromal precursor cells has not yet been characterized in DD.
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Sofia Karkampouna, Michiel Kreulen, Miryam Obdeijn, Peter Kloen, Annemarie Dorjée, Felice Rivellese, Adrian Chojnowski, Ian Clark and Marianna Krutihof-de Julio declare that they have no conflict of interest.
Human and Animal Rights and Informed Consent
This article contains studies on human subjects; Dupuytren’s connective tissue nodules were collected during partial fasciectomy procedure. Confirmation that the Medical Research Involving Human Subjects Act (WMO) does not apply to the present study was obtained by the local ethics committee (reference number W12_245 # 12.17.0279) since the research was performed on “waste” material.
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This article is part of the Topical Collection on Stem/Progenitor Cells Biology and Regeneration
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Karkampouna, S., Kreulen, M., Obdeijn, M.C. et al. Connective Tissue Degeneration: Mechanisms of Palmar Fascia Degeneration (Dupuytren’s Disease). Curr Mol Bio Rep 2, 133–140 (2016). https://doi.org/10.1007/s40610-016-0045-3
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DOI: https://doi.org/10.1007/s40610-016-0045-3