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Lim T, Tang Q, Zhu ZZ, Feng Y, Zhan S, Wei XJ, Zhang CQ. A decellularized scaffold derived from squid cranial cartilage for use in cartilage tissue engineering. J Mater Chem B 2020; 8:4516-4526. [PMID: 32373898 DOI: 10.1039/d0tb00483a] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Decellularized cartilage scaffold (DCS) is an emerging substitute for cartilage defect application.
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Affiliation(s)
- Thou Lim
- Department of Orthopedic Surgery
- Shanghai Jiao Tong University Affiliated Shanghai Sixth People's Hospital
- Shanghai 200233
- China
| | - Qian Tang
- Department of Orthopedic Surgery
- Shanghai Jiao Tong University Affiliated Shanghai Sixth People's Hospital
- Shanghai 200233
- China
| | - Zhen-Zhong Zhu
- Department of Orthopedic Surgery
- Shanghai Jiao Tong University Affiliated Shanghai Sixth People's Hospital
- Shanghai 200233
- China
| | - Yong Feng
- Department of Orthopedic Surgery
- Shanghai Jiao Tong University Affiliated Shanghai Sixth People's Hospital
- Shanghai 200233
- China
| | - Shi Zhan
- Institute of Microsurgery on Extremities
- Shanghai Jiao Tong University Affiliated Shanghai Sixth People's Hospital
- Shanghai 200233
- China
| | - Xiao-Juan Wei
- Institute of Microsurgery on Extremities
- Shanghai Jiao Tong University Affiliated Shanghai Sixth People's Hospital
- Shanghai 200233
- China
| | - Chang-Qing Zhang
- Department of Orthopedic Surgery
- Shanghai Jiao Tong University Affiliated Shanghai Sixth People's Hospital
- Shanghai 200233
- China
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von Byern J, Rudoll L, Cyran N, Klepal W. Histochemical characterization of the adhesive organ of threeIdiosepiusspp. species. Biotech Histochem 2009; 83:29-46. [DOI: 10.1080/10520290801999316] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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Gartaganis SP, Georgakopoulos CD, Assouti M, Mela EK, Exarchou A, Giannelou I, Gotsis SS, Ziouti N, Vynios DH, Tripathi BJ, Tripathi RC. Changes in HNK-1 epitope and collagen type IX in the aqueous humour of patients with pseudoexfoliation syndrome. Curr Eye Res 2009; 28:5-10. [PMID: 14704908 DOI: 10.1076/ceyr.28.1.5.23490] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
PURPOSE To investigate alterations in the proteoglycan (PG) and glycosaminoglycan (GAG) content of the aqueous humour in patients with pseudoexfoliation syndrome (PEX). MATERIALS AND METHODS Aqueous humor samples were obtained during cataract surgery from nineteen patients bearing PEX features and twenty-three age-matched normal controls. Protein and IgG were quantified densitometrically after their electrophoretic separation. Collagen type IX, 3-sulphoglucuronic acid (HNK-1 epitope), biglycan and heparan sulphate proteoglycans were detected in Western and dot blots by using specific monoclonal antibodies (MAbs). The immunochemical analysis was performed in native aqueous humour or after degradation of the glycosaminoglycans with chondroitinases. RESULTS Degradation of the samples with chondroitinases ABC, AC and B revealed that, in the aqueous humour from PEX eyes, collagen type IX and biglycan had a more dermatan sulphate than did normal eyes. In addition, more HNK-1 epitope was observed in PEX eyes, which after similar enzymatic treatment was found to be located mainly in dermatan sulphate sequences. 3-sulphoglucuronic acid was a constituent of the GAG chains of the collagen type IX. We found that the electrophoretic mobility of the bands of collagen type IX and HNK-1 epitope was exactly the same in the aqueous humour of normal and PEX samples; both migrated as four bands at 120, 113, 92.6 and 56 kDa. The PGs bearing heparan sulphate were found only in normal samples. Other PGs were not detected. CONCLUSIONS Because no significant difference was observed in the concentration of albumin and IgG in PEX and normal samples, the blood-aqueous barrier was probably not significantly compromised in PEX patients with cataract but without open-angle glaucoma. The results support the hypothesis that the pathogenesis of PEX can be linked to disturbed metabolism of GAGs and PGs.
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Affiliation(s)
- S P Gartaganis
- Department of Ophthalmology, University of Patras Medical School, Patras, Rion, Greece.
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Vynios DH, Tsagaraki I, Grigoreas GHA, Samiotaki M, Panayotou G, Kyriakopoulou D, Georgiou P, Korbakis D, Panayotou A, Nanouri K, Assouti M, Andonopoulos AP. Autoantibodies against aggrecan in systemic rheumatic diseases. Biochimie 2006; 88:767-73. [PMID: 16488067 DOI: 10.1016/j.biochi.2006.01.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2005] [Accepted: 01/06/2006] [Indexed: 11/20/2022]
Abstract
OBJECTIVE This study was undertaken to investigate the presence of autoantibodies against the main cartilage proteoglycan, aggrecan, in systemic rheumatic disease sera, and to identify substructure(s) responsible for the autoimmune response. METHODS Sera were obtained from 86 patients with various systemic rheumatic diseases, 14 with osteoarthritis (OA), 18 with cancer and 40 healthy individuals. The presence of autoantibodies against aggrecan was examined by a solid phase assay and by Western blotting, using proteoglycan aggregates treated with proteolytic enzymes. The positive bands were subjected to nanohigh performance liquid chromatography (nanoHPLC)-MS, in order to identify the aggrecan substructures involved in the autoimmune response. RESULTS Autoantibodies against aggrecan were identified in all systemic rheumatic disease sera at a high titre, almost three times that observed in healthy controls. OA and cancer sera produced a reaction equal to that of the healthy. Western blotting analysis of aggrecan proteolytic fragments revealed the presence of a triple band, reacting with the patients' sera, of about 37 kDa, which also reacted with a polyclonal antibody against hyaluronan-binding region. NanoHPLC-MS analysis suggested that this band belonged to the G2 domain of aggrecan. CONCLUSION At least a part of the autoimmune reaction to aggrecan, displayed by the systemic disease sera, involves the G2 domain. The significant difference observed between these sera and those from other diseases, especially cancer, may suggest a possible discriminatory role of anti-aggrecan antibodies. This may help in the differential diagnosis in complicated clinical cases. However, for this to be confirmed, studies in larger cohorts of patients should be performed.
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Affiliation(s)
- D H Vynios
- Laboratory of Biochemistry, Department of Chemistry, School of Natural Sciences, University of Patras, 26500 Rio, Patras, Greece.
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Assouti M, Vynios DH, Anagnostides ST, Papadopoulos G, Georgakopoulos CD, Gartaganis SP. Collagen type IX and HNK-1 epitope in tears of patients with pseudoexfoliation syndrome. Biochim Biophys Acta Mol Basis Dis 2006; 1762:54-8. [PMID: 16257185 DOI: 10.1016/j.bbadis.2005.09.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2005] [Revised: 09/20/2005] [Accepted: 09/20/2005] [Indexed: 11/22/2022]
Abstract
Pseudoexfoliation syndrome (PEX) is an age-related condition, which may cause open-angle glaucoma and has increasing interest since it seems to affect additional human tissues, i.e., cardiovascular tissue, skin, and still lacks elucidated pathogenesis. Collagen type IX and HNK-1 epitope have been considered characteristic constituents of the aqueous humour of PEX patients, since their amounts were increased in PEX aqueous humour compared to normal eyes. Since it has been proposed that the initial manifestations of PEX syndrome occur in conjunctiva, the present study was undertaken to investigate the presence of the same antigens in tears of PEX patients and their possible use as the biochemical markers for early diagnosis. Tears of PEX patients and healthy individuals were subjected to western blotting analysis for various basement membrane components identified in aqueous humour. It was found that collagen type IX and HNK-1 epitope were present in tears, the amount of the former being increased 2.7 times compared to normal (P<0.05), surprisingly high as compared with total protein or lysozyme activity in tears, which were found to be increased in PEX patients about 25% with no statistical differences (P approximately 0.4). The results suggest the possible use of tears' collagen type IX for the diagnosis of PEX syndrome.
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Affiliation(s)
- M Assouti
- Laboratory of Biochemistry, Department of Chemistry, University of Patras, 26500 Patras, Greece
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Cole AG, Hall BK. Cartilage is a metazoan tissue; integrating data from nonvertebrate sources. ACTA ZOOL-STOCKHOLM 2004. [DOI: 10.1111/j.0001-7272.2004.00159.x] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Tsilemou A, Assouti M, Papageorgakopoulou N, Karamanos NK, Tsiganos CP, Vynios DH. The presence of a novel extracellular hyaluronidase in squid cranial cartilage. Biochimie 2004; 86:579-86. [PMID: 15388235 DOI: 10.1016/j.biochi.2004.07.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2004] [Accepted: 07/05/2004] [Indexed: 10/26/2022]
Abstract
A new type of hyaluronidase was isolated from squid cranial cartilage. The enzyme seems to be localised extracellularly, since it is extracted from the tissue by 0.5 M sodium acetate, pH 7.0, in the presence of proteinase inhibitors. Degradation studies suggest that the enzyme belongs to the family of endoglycosidases generating oligosaccharides of rather large size. The best activity of the enzyme was observed at pH 7.0 and 37 degrees C and the optimum buffer for digestion was 0.15 M Tris acetate. It is inactive in sodium phosphate, morpholine acetate and HEPES buffers. The enzyme degrades aggrecan, hyaluronan, chondroitin sulphate and oversulphated chondroitin sulphate.
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Affiliation(s)
- A Tsilemou
- Laboratory of Biochemistry, Department of Chemistry, University of Patras, 26500 Patras, Greece
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Vynios DH, Faraos A, Mastronikolis NS, Goumas P, Tsiganos CP. A solid phase assay for the determination of heparan sulfate and its application to normal and cancerous human cartilage samples. J Immunoassay Immunochem 2004; 22:337-51. [PMID: 11816802 DOI: 10.1081/ias-100107399] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
A sensitive and accurate quantitative assay for the measurement of minor amounts of chondroitin/dermatan sulfate and heparan sulfate that does not require specific apparatus or reagents is described. The assay involves labeling of chondroitin sulfate A following reaction of carboxyl groups with biotin hydrazide in the presence of carbodiimide. ELISA plate wells were coated with glutaraldehyde and then spermine was coupled to it via a Schiff's base bond. In such activated wells, the biotinylated molecules were readily bound and detected after the interaction with avidin-peroxidase conjugates and the subsequent enzymic assay. Chondroitin/dermatan sulfate and heparan sulfate competed this interaction in a linear manner. Disaccharides derived from chondroitin sulfate A did not act as competitors, while heparan sulfate disaccharides showed significant competition. From the competition, before and after digestion with either chondroitinase ABC or heparitinases, the amounts of chondroitin sulfate and heparan sulfate in a sample could be calculated. The assay was applied for the determination of sulfated glycosaminoglycans in normal and cancerous human laryngeal cartilage samples. By using this procedure, the accurate determination, especially, of heparan sulfate in a mixture of glycosaminoglycans was achieved, which otherwise would require the use of very expensive technology.
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Affiliation(s)
- D H Vynios
- Department of Chemistry, University Hospital, University of Patras, Greece.
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Skandalis SS, Theocharis AD, Vynios DH, Theocharis DA, Papageorgakopoulou N. Proteoglycans in human laryngeal cartilage. Identification of proteoglycan types in successive cartilage extracts with particular reference to aggregating proteoglycans. Biochimie 2004; 86:221-9. [PMID: 15134837 DOI: 10.1016/j.biochi.2004.01.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2003] [Accepted: 01/30/2004] [Indexed: 10/26/2022]
Abstract
The content, composition and structure of proteoglycans (PGs) in adult human laryngeal cartilage (HLC) were investigated. PGs were extracted from the tissue by using two different extraction protocols. In the first protocol, PGs were extracted under dissociative conditions, 4 M guanidine HCl (GdnHCl), and in the second protocol, sequentially, with phosphate buffered saline (PBS) and solutions of increasing GdnHCl concentration (0.5, 1, 2 and 4 M). Chemical and immunological analyses of dissociate extracts (first protocol) revealed the presence of four, at least, different types of PGs. Aggrecan was the major PG, versican, decorin and biglycan being in small amounts. Galactosaminoglycan-containing PGs (GalAGPGs) represented the vast majority of total PGs present in extracts of HLC. Differential digestion with chondroitinase ABC and AC II showed that the GalAGPGs from HLC contained a significant proportion of dermatan sulphate (DS). In addition, disaccharide analysis showed that 6-sulphated disaccharides predominated in chondroitin sulphate (CS) chains. The sequential extraction (second protocol) indicated that PBS extract contained very little amount of PGs. The 0.5, 1 and 2 M GdnHCl extracts contained 6.3%, 24.5% and 15.2% of total extracted PGs, respectively. Four molar GdnHCl extracted the larger proportion, about 53%, of total PGs. This extract contained almost only proteoglycan aggregate components i.e., G1 bearing aggrecan, hyaluronan and link protein. The characterization of the aggrecan showed that it constituted a polydisperse population of monomers with an average molecular mass of 720 kDa. The glycosaminoglycans (GAGs) present were chondroitin sulphate with a M(r) of 15 kDa, and keratan sulphate (KS) with a M(r) of 10 kDa, in proportions 84% and 16%, respectively.
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Affiliation(s)
- Spyros S Skandalis
- Organic Chemistry, Biochemistry and Natural Products Division, Department of Chemistry, University of Patras, Patras 26500, Greece
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Theocharis AD, Vynios DH, Papageorgakopoulou N, Skandalis SS, Theocharis DA. Altered content composition and structure of glycosaminoglycans and proteoglycans in gastric carcinoma. Int J Biochem Cell Biol 2003; 35:376-90. [PMID: 12531251 DOI: 10.1016/s1357-2725(02)00264-9] [Citation(s) in RCA: 112] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Glycosaminoglycans (GAGs) in proteoglycan (PG) forms or as free GAGs are implicated in the growth and progression of malignant tumors. These macromolecules were investigated in human gastric carcinoma (HGC) and compared with those in human normal gastric mucosa (HNG). We report that HGC contained about 2-fold increased amounts of GAGs in comparison to HNG. Specifically, HGC showed 3- and 2.5-fold net increase in chondroitin sulphate (CS) and hyaluronan (HA) contents, respectively. Dermatan sulphate (DS) was slightly increased, but the amount of heparan sulphate (HS) was decreased. Of particular, interest were the quite different sulphation profiles of CS and DS chains in HGC in which, non-sulphated and 6-sulphated disaccharide units were increased 10 and 4 times, respectively, in comparison to HNG. On PG level, three different populations were identified in both HNG and HGC, being HSPGs, versican (CS/DS chains) and decorin (CS/DS chains). In HGC, the amounts of versican and decorin were significantly increased about 3- and 8-fold, respectively. These PGs were also characterized by marked decrease in hydrodynamic size and GAG content per PG molecule. Analysis of Delta-disaccharide of versican and decorin from HGC showed an increase of 6-sulphated Delta-disaccharides (Delta di-6S) and non-sulphated Delta-disaccharides (Delta di-0S) with a parallel decrease of 4-sulphated Delta-disaccharides (Delta di-4S) as compared to HNG, which closely correlated with the increase of CS content. In addition, the accumulation of core proteins of versican and decorin in HGC was also associated with many post-translational modifications, referring to the number, size, degree and patterns of sulphation and epimerization of CS/DS chains. Studies on the modified metabolism of PGs/GAGs are under progress and will help in deeper understanding of the environment in which tumor cells proliferate and invade.
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Affiliation(s)
- Achilleas D Theocharis
- Laboratory of Biochemistry, Section of Organic Chemistry, Biochemistry and Natural Products, Department of Chemistry, University of Patras, 26110 Patras, Greece
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Noulas AV, Theocharis AD, Feretis E, Papageorgakopoulou N, Karamanos NK, Theocharis DA. Pig vitreous gel: macromolecular composition with particular reference to hyaluronan-binding proteoglycans. Biochimie 2002; 84:295-302. [PMID: 12106907 DOI: 10.1016/s0300-9084(02)01389-5] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The aim of this study was to examine the macromolecular composition of pig vitreous body with particular emphasis on hyaluronan-binding proteoglycans. The whole pig vitreous gel was found to contain 76 microg of hyaluronan-derived uronic acid, 700 microg of total protein and 150 microg of collagen per ml of gel. The contents of neutral hexoses and sialic acids were 80 and 22 microg/ml of vitreous gel, but only a minor proportion of them were found to be associated with the proteoglycan fraction. As estimated by gel chromatography on Sepharose CL-2B, hyaluronan presents a polydisperse hydrodynamic behavior with a lower molecular mass (M(r)) value of 220 kDa. The existence of low amounts of a hyaluronan-binding proteoglycan population with structural and immunological characteristics similar to a member of the hyalectan family, versican, has also been demonstrated. The concentration of this versican-like proteoglycan in whole vitreous accounts for 50 microg proteoglycan protein per ml of vitreous gel and represents a minor proportion (about 7%) of the total protein content. The proteoglycan has an average M(r) of 360 kDa and is substituted by chondroitin sulphate (CS) side chains. Study of the CS sulphation pattern showed that the chains were composed of both type 4- and 6-sulphated disaccharide units.
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Affiliation(s)
- Argiris V Noulas
- Department of Chemistry, Section of Organic Chemistry, Biochemistry and Natural Products, Laboratory of Biochemistry, University of Patras, 26110, Patras, Greece
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Papadas TA, Stylianou M, Mastronikolis NS, Papageorgakopoulou N, Skandalis S, Goumas P, Theocharis DA, Vynios DH. Alterations in the content and composition of glycosaminoglycans in human laryngeal carcinoma. Acta Otolaryngol 2002; 122:330-7. [PMID: 12030585 DOI: 10.1080/000164802753648268] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Glycosaminoglycans in normal and cancerous human laryngeal cartilage were isolated and characterized by means of enzyme susceptibility and high performance liquid chromatography. The known mammalian glycosaminoglycans were identified in all samples but their content and composition varied between normal and malignant samples. Chondroitin/dermatan sulphate was the major glycosaminoglycan in all cases, but its relative proportion was decreased in malignant samples. Its sulphation pattern showed that in normal samples it was sulphated mainly at the C6 position of galactosamine, whereas in malignant samples it was sulphated mainly at C4. Dermatan sulphate, expressed as a result of the different digestion of samples with chondroitinases, was present in very small amounts in normal samples (2.7% of total sulphated glycosaminoglycans) but increased in proportion up to 27.7% in malignant samples. The content of oversulphated chondroitin/dermatan was increased twofold in malignant samples. The content of heparan sulphate was increased almost fivefold in malignant samples as compared to normal ones. The content of hyaluronan was increased in malignant samples 3.5-fold, amounting to up to 11.4% of total glycosaminoglycans. These dramatic changes in the content and composition of glycosaminoglycans seemed to be characteristic of the tumour and independent of its status.
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Affiliation(s)
- Th A Papadas
- Department of Otolaryngology, University Hospital, University of Patras, Greece
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Papageorgakopoulou N, Theocharis AD, Skandalis SS, Vynios DH, Theocharis DA, Tsiganos CP. Keratan sulphate in cerebrum, cerebellum and brainstem of sheep brain. Biochimie 2001; 83:973-8. [PMID: 11728636 DOI: 10.1016/s0300-9084(01)01324-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Keratan sulphate was identified in sheep brain. We describe here the isolation and partial characterization of keratan sulphate from cerebrum, cerebellum and brainstem of young sheep brains. The galactosaminoglycan was isolated by using ion-exchange chromatography and gel filtration after exhaustive digestion with papain of the delipidated tissues, followed by alkaline borohydride degradation and chondroitinase ABC and heparinases I, II and III treatment. The material isolated by ion-exchange chromatography from each tissue was eluted as single but polydispersed peak from Sephadex G-75, with average molecular masses 8.4, 7.9 and 8.8 kDa for cerebrum, cerebellum and brainstem, respectively. Keratanase I and II totally degraded keratan sulphate from cerebrum and brainstem, but only partially that from cerebellum. The content of keratan sulphate was found to be about 215, 173 and 144 microg/g dry delipidated tissue for cerebrum, brainstem and cerebellum, respectively.
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Affiliation(s)
- N Papageorgakopoulou
- Department of Chemistry, Organic Chemistry, Biochemistry and Natural Products Division, University of Patras, Patras 26500, Greece.
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Vynios DH, Papageorgakopoulou N, Sazakli H, Tsiganos CP. The interactions of cartilage proteoglycans with collagens are determined by their structures. Biochimie 2001; 83:899-906. [PMID: 11698112 DOI: 10.1016/s0300-9084(01)01332-3] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
In the present work, the interaction of aggrecan, decorin and biglycan isolated from pig laryngeal cartilage and of the three squid cartilage proteoglycans with collagen type I and II was studied. The interaction was examined under conditions allowing the formation of collagen fibrils. It was found that biglycan interacted strongly with collagen type II and not with type I and the interaction seemed to proceed exclusively through its core proteins. Decorin interacted with collagen type I but not with type II. Aggrecan interacted very poorly with both collagen types. The two squid proteoglycans of large size, D1D1A and D1D2, interacted only with collagen type I through both glycosaminoglycans and core proteins. The third squid proteoglycan of small size, D1D1B, interacted poorly only with collagen type I. The results suggested that the interactions of cartilage proteoglycans with collagen were mainly due to the primary structure of both molecules, and would contribute to the maintenance of the integrity of the tissue. The biochemical significance of these interactions might be more critical in aged vertebrate cartilage, where loss of aggrecan and increase of the small proteoglycans was observed, a large proportion of which is found in the extracellular matrix free of glycosaminoglycan chains.
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Affiliation(s)
- D H Vynios
- Laboratory of Biochemistry, Department of Chemistry, University of Patras, 261 10 Patras, Greece.
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