Dermatan sulfates of normal and scarred fascia.
ABSTRACT We evaluated the composition of dermatan sulfates (DS) derived from 23 samples of normal and 23 samples of scarred fascia lata. We analyzed the molecular weight of intact DS chains and the length of chain regions comprising: (1) clusters of L-iduronate-containing disaccharides ("iduronic sections"); (2) clusters of D-glucuronate-containing disaccharides ("glucuronic sections"); and (3) copolymeric sections with both types of disaccharides. A portion of scarred fascia DS chains demonstrated higher molecular weight compared with those from normal tissue. Most disaccharides of DS chains derived from both fascia types form copolymeric segments - heterogeneous in size - with alternatively distributed single disaccharides with glucuronic residues and mainly single ones with iduronate. Only a small number of disaccharides form "glucuronic sections" of heterogeneous size or short "iduronic sections". However, the scarred fascia DS chains demonstrate an increased content of shorter "glucuronic sections" and shorter, often oversulfated, copolymeric segments. It seems that in normal fascia, the DS chain type with a single, long copolymeric region and a single, shorter "glucuronic section" is predominant, while in scarred tissue an increase in multidomain DS chain content may occur.
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ABSTRACT: Fibroblast growth factor-10 (FGF-10) is essential for epithelial development, while other members of this family, such as FGF-7, are not. FGF-10 is abundantly released into wounds following injury, and likely an essential growth factor required for this process. To evaluate how activation of this growth factor is controlled, multiple glycosaminoglycans were combined with FGF-10 assayed by measurement of the proliferation of cell lines expressing FGF receptor-2-IIIb, or keratinocyte migration in an in vitro wound repair assay. Dermatan sulfate (DS) exhibited greater potency than heparan sulfate or other chondroitin sulfates found in wounds. Structural variants of DS between 10 and 20 disaccharides containing iduronic acid showed maximal capacity to enable FGF-10 receptor stimulation. Furthermore, FGF-10 and DS markedly enhanced migration of keratinocytes in an in vitro wound scratch assay, while FGF-7 or other glycosaminoglycans did not. These data strongly suggest that FGF-10 activity is uniquely important in wound repair and that specific DS structural properties are necessary to promote FGF-10 function. These observations identify a novel interplay between DS and FGF-10 in mediating wound repair.Wound Repair and Regeneration 02/2009; 17(1):118-26. · 2.77 Impact Factor
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ABSTRACT: Structural requirements of the short isoform of platelet derived growth factor BB (PDGF-BB) to bind dermatan sulfate (DS)/chondroitin sulfate (CS) are unknown. Meanwhile the interaction may be important for tissue repair and fibrosis which involve both high activity of PDGF-BB and matrix accumulation of DS. We examined by the solid phase assay the growth factor binding to DS chains of small proteoglycans from various fasciae as well as to standard CSs. Before the assay a structural analysis of DSs and CSs was accomplished involving the evaluation of their epimerization and/or sulfation patterns. In addition, in vivo acceptors for PDGF-BB in fibrosis affected fascia were detected. PDGF-BB binding sites on DSs/CSs are located in long chain sections with the same type of hexuronate isomer however without any apparent preference to glucuronate or iduronate residues. Alternatively, the interaction seems to involve two shorter DS chain sections assembling disaccharides with the same type of hexuronate isomer which are separated by disaccharide(s) with another hexuronate one. Moreover, DS/CS affinity to the growth factor most probably depends on an accumulation of di-2,4-O-sulfated disaccharides in binding site while the presence of 6-O-sulfated N-acetyl-galactosamine residues rather attenuates the binding. All examined fascia DSs and standard CSs showed significant PDGF-BB binding capability with the highest affinity found for normal palmar fascia decorin DS. In fibrosis affected palmar fascia DS/CS proteoglycans are able to form with PDGF-BB supramolecular complexes also including other matrix components such as type III collagen and fibronectin which bind the growth factor covalently. Our results suggest that DS chains of fascia matrix small PGs may regulate PDGF-BB availability leading to restriction of fibrosis associated with Dupuytren's disease or to control of normal fascia repair.Biochimie 11/2009; · 3.14 Impact Factor
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ABSTRACT: The fascial system is an integral part of the musculoskeletal system. It is a three-dimensional network of connective tissue spreading ubiquitously throughout the body, surrounding muscles, bones, internal organs, nerves, vessels, and other structures. The basic biophysical properties of the fascial system are determined by its structure and chemical composition. This study aimed to determine the elemental composition of pathologically unchanged fascia lata of the thigh, collected during autopsies on humans and dogs. The wide spectrum of elements analysed included both macro and micro elements. The analyses were conducted using scanning electron microscopy with X-ray microanalysis (SEM-EDS). Concentrations of the following macro and micro elements were dermined: C, N, O, Na, Mg, Al, Si, P, S, Cl, K, Ca, Ti, Fe Co, Ni, Cu, and Zn. The obtained results showed significant differences between human and canine fascia lata regarding the content of most of the examined elements (p < 0.05), except for N. These data may in future provide a starting point for the establishment of reference values for the content of various elements in normal fascial tissue and may also serve to verify the usefulness of experimental animal material as a substitute for human tissue.Acta biochimica Polonica 11/2012; · 1.39 Impact Factor