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Kotla NG, Mohd Isa IL, Larrañaga A, Maddiboyina B, Swamy SK, Sivaraman G, Vemula PK. Hyaluronic Acid-Based Bioconjugate Systems, Scaffolds, and Their Therapeutic Potential. Adv Healthc Mater 2023; 12:e2203104. [PMID: 36972409 DOI: 10.1002/adhm.202203104] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 03/04/2023] [Indexed: 03/29/2023]
Abstract
In recent years, the development of hyaluronic acid or hyaluronan (HA) based scaffolds, medical devices, bioconjugate systems have expanded into a broad range of research and clinical applications. Research findings over the last two decades suggest that the abundance of HA in most mammalian tissues with distinctive biological roles and chemical simplicity for modifications have made it an attractive material with a rapidly growing global market. Besides its use as native forms, HA has received much interest on so-called "HA-bioconjugates" and "modified-HA systems". In this review, the importance of chemical modifications of HA, underlying rationale approaches, and various advancements of bioconjugate derivatives with their potential physicochemical, and pharmacological advantages are summarized. This review also highlights the current and emerging HA-based conjugates of small molecules, macromolecules, crosslinked systems, and surface coating strategies with their biological implications, including their potentials and key challenges discussed in detail.
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Affiliation(s)
- Niranjan G Kotla
- Institute for Stem Cell Science and Regenerative Medicine (inStem), Bangalore, Karnataka, 560065, India
| | - Isma Liza Mohd Isa
- Department of Anatomy, Faculty of Medicine, Universiti Kebangsaan Malaysia, Kuala Lumpur, 56000, Malaysia
| | - Aitor Larrañaga
- Department of Mining-Metallurgy Engineering and Materials Science, POLYMAT, Faculty of Engineering, University of the Basque Country (UPV/EHU), Bilbao, 48013, Spain
| | - Balaji Maddiboyina
- Department of Medical Writing, Freyr Solutions, Hyderabad, Telangana, 500081, India
| | - Samantha K Swamy
- Thrombosis Research Center (TREC), Department of Clinical Medicine, UiT-The Arctic University of Norway, Tromsø, 9037, Norway
| | - Gandhi Sivaraman
- Department of Chemistry, Gandhigram Rural Institute (Deemed to be University), Gandhigram, Tamil Nadu, 624302, India
| | - Praveen K Vemula
- Institute for Stem Cell Science and Regenerative Medicine (inStem), Bangalore, Karnataka, 560065, India
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2
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Thiol-Ene Reaction of Heparin Allyl Ester, Heparin 4-Vinylbenzyl Ester and Enoxaparin. REACTIONS 2022. [DOI: 10.3390/reactions3030031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Heparin allyl ester and heparin 4-vinylbenzyl ester were prepared and examined for their potential for thiol-ene reaction using both free radical initiators and photochemistry. While both undergo reaction with mercaptoacetic acid, the allyl ester adduct proved to be somewhat more labile. Several more examples of adducts from heparin 4-vinylbenzyl ester are reported. Similar reactions on enoxaparin, where the reaction site is solely at the non-reducing end of the molecule, are also reported. These reactions may show promise as a strategy in the development of drug conjugates.
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Hachim D, Whittaker TE, Kim H, Stevens MM. Glycosaminoglycan-based biomaterials for growth factor and cytokine delivery: Making the right choices. J Control Release 2019; 313:131-147. [PMID: 31629041 PMCID: PMC6900262 DOI: 10.1016/j.jconrel.2019.10.018] [Citation(s) in RCA: 74] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Revised: 09/30/2019] [Accepted: 10/01/2019] [Indexed: 12/21/2022]
Abstract
Controlled, localized drug delivery is a long-standing goal of medical research, realization of which could reduce the harmful side-effects of drugs and allow more effective treatment of wounds, cancers, organ damage and other diseases. This is particularly the case for protein "drugs" and other therapeutic biological cargoes, which can be challenging to deliver effectively by conventional systemic administration. However, developing biocompatible materials that can sequester large quantities of protein and release them in a sustained and controlled manner has proven challenging. Glycosaminoglycans (GAGs) represent a promising class of bio-derived materials that possess these key properties and can additionally potentially enhance the biological effects of the delivered protein. They are a diverse group of linear polysaccharides with varied functionalities and suitabilities for different cargoes. However, most investigations so far have focused on a relatively small subset of GAGs - particularly heparin, a readily available, promiscuously-binding GAG. There is emerging evidence that for many applications other GAGs are in fact more suitable for regulated and sustained delivery. In this review, we aim to illuminate the beneficial properties of various GAGs with reference to specific protein cargoes, and to provide guidelines for informed choice of GAGs for therapeutic applications.
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Affiliation(s)
- Daniel Hachim
- Department of Materials, Imperial College London, London, SW7 2AZ, United Kingdom; Department of Bioengineering, Imperial College London, London, SW7 2AZ, United Kingdom; Institute of Biomedical Engineering, Imperial College London, London, SW7 2AZ, United Kingdom
| | - Thomas E Whittaker
- Department of Materials, Imperial College London, London, SW7 2AZ, United Kingdom; Department of Bioengineering, Imperial College London, London, SW7 2AZ, United Kingdom; Institute of Biomedical Engineering, Imperial College London, London, SW7 2AZ, United Kingdom
| | - Hyemin Kim
- Department of Materials, Imperial College London, London, SW7 2AZ, United Kingdom; Department of Bioengineering, Imperial College London, London, SW7 2AZ, United Kingdom; Institute of Biomedical Engineering, Imperial College London, London, SW7 2AZ, United Kingdom
| | - Molly M Stevens
- Department of Materials, Imperial College London, London, SW7 2AZ, United Kingdom; Department of Bioengineering, Imperial College London, London, SW7 2AZ, United Kingdom; Institute of Biomedical Engineering, Imperial College London, London, SW7 2AZ, United Kingdom.
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Wu M, Wen D, Gao N, Xiao C, Yang L, Xu L, Lian W, Peng W, Jiang J, Zhao J. Anticoagulant and antithrombotic evaluation of native fucosylated chondroitin sulfates and their derivatives as selective inhibitors of intrinsic factor Xase. Eur J Med Chem 2015; 92:257-69. [DOI: 10.1016/j.ejmech.2014.12.054] [Citation(s) in RCA: 96] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2014] [Revised: 12/29/2014] [Accepted: 12/30/2014] [Indexed: 11/25/2022]
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Miller T, Goude MC, McDevitt TC, Temenoff JS. Molecular engineering of glycosaminoglycan chemistry for biomolecule delivery. Acta Biomater 2014; 10:1705-19. [PMID: 24121191 PMCID: PMC3960340 DOI: 10.1016/j.actbio.2013.09.039] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2013] [Revised: 09/19/2013] [Accepted: 09/30/2013] [Indexed: 12/22/2022]
Abstract
Glycosaminoglycans (GAGs) are linear, negatively charged polysaccharides that interact with a variety of positively charged growth factors. In this review article the effects of engineering GAG chemistry for molecular delivery applications in regenerative medicine are presented. Three major areas of focus at the structure-function-property interface are discussed: (1) macromolecular properties of GAGs; (2) effects of chemical modifications on protein binding; (3) degradation mechanisms of GAGs. GAG-protein interactions can be based on: (1) GAG sulfation pattern; (2) GAG carbohydrate conformation; (3) GAG polyelectrolyte behavior. Chemical modifications of GAGs, which are commonly performed to engineer molecular delivery systems, affect protein binding and are highly dependent on the site of modification on the GAG molecules. The rate and mode of degradation can determine the release of molecules as well as the length of GAG fragments to which the cargo is electrostatically coupled and eventually released from the delivery system. Overall, GAG-based polymers are a versatile biomaterial platform offering novel means to engineer molecular delivery systems with a high degree of control in order to better treat a range of degenerated or injured tissues.
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Affiliation(s)
- Tobias Miller
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, 313 Ferst Drive, Atlanta, GA 30332, USA
| | - Melissa C Goude
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, 313 Ferst Drive, Atlanta, GA 30332, USA
| | - Todd C McDevitt
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, 313 Ferst Drive, Atlanta, GA 30332, USA; Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Johnna S Temenoff
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, 313 Ferst Drive, Atlanta, GA 30332, USA; Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, GA 30332, USA.
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Gemma E, Meyer O, Uhrín D, Hulme AN. Enabling methodology for the end functionalisation of glycosaminoglycan oligosaccharides. MOLECULAR BIOSYSTEMS 2008; 4:481-95. [DOI: 10.1039/b801666f] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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7
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Šorm M, Nešpurek S, Mrkvičková L, Kálal J, Vorlová Z. Anticoagulation activity of some sulfate-containing polymers of the methacrylate type. ACTA ACUST UNITED AC 2007. [DOI: 10.1002/polc.5070660132] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Fernández C, Hattan CM, Kerns RJ. Semi-synthetic heparin derivatives: chemical modifications of heparin beyond chain length, sulfate substitution pattern and N-sulfo/N-acetyl groups. Carbohydr Res 2006; 341:1253-65. [PMID: 16712822 DOI: 10.1016/j.carres.2006.04.014] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2006] [Revised: 04/04/2006] [Accepted: 04/09/2006] [Indexed: 11/24/2022]
Abstract
The glycosaminoglycan heparin is a polyanionic polysaccharide most recognized for its anticoagulant activity. Heparin binds to cationic regions in hundreds of prokaryotic and eukaryotic proteins, termed heparin-binding proteins. The endogenous ligand for many of these heparin-binding proteins is a structurally similar glycosaminoglycan, heparan sulfate (HS). Chemical and biosynthetic modifications of heparin and HS have been employed to discern specific sequences and charge-substitution patterns required for these polysaccharides to bind specific proteins, with the goal of understanding structural requirements for protein binding well enough to elucidate the function of the saccharide-protein interactions and/or to develop new or improved heparin-based pharmaceuticals. The most common modifications to heparin structure have been alteration of sulfate substitution patterns, carboxyl reduction, replacement N-sulfo groups with N-acetyl groups, and chain fragmentation. However, an accumulation of reports over the past 50 years describe semi-synthetic heparin derivatives obtained by incorporating aliphatic, aryl, and heteroaryl moieties into the heparin structure. A primary goal in many of these reports has been to identify heparin-derived structures as new or improved heparin-based therapeutics. Presented here is a perspective on the introduction of non-anionic structural motifs into heparin structure, with a focus on such modifications as a strategy to generate novel reduced-charge heparin-based bind-and-block antagonists of HS-protein interactions. The chemical methods employed to synthesize such derivatives, as well as other unique heparin conjugates, are reviewed.
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Affiliation(s)
- Cristina Fernández
- Division of Medicinal and Natural Products Chemistry, University of Iowa, Iowa City, IA 52242, USA
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9
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Petitou M, Coudert C, Level M, Lormeau JC, Zuber M, Simenel C, Fournier JP, Choay J. Selectively O-acylated glycosaminoglycan derivatives. Carbohydr Res 1992. [DOI: 10.1016/0008-6215(92)85010-w] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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10
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Bârzu T, Desmoulière A, Herbert JM, Level M, Herault JP, Petitou M, Lormeau JC, Gabbiani G, Pascal M. O-acylated heparin derivatives with low anticoagulant activity decrease proliferation and increase alpha-smooth muscle actin expression in cultured arterial smooth muscle cells. Eur J Pharmacol 1992; 219:225-33. [PMID: 1425951 DOI: 10.1016/0014-2999(92)90300-s] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Selectively O-acylated derivatives of various glycosaminoglycans were prepared and tested in vitro for their anticoagulant activity and their antiproliferative effect on rat and rabbit smooth muscle cells. When O-acylation (butyrylation or hexanoylation) had been performed on periodate-depolymerized heparin fragments having very low anticoagulant activity, the antiproliferative potency was markedly increased (IC50 = 2 and 1 micrograms/ml respectively, versus 31 micrograms/ml for starting compound) without an increase in anticoagulant activity. The antiproliferative activity was related to the degree of acylation. The O-acylated derivatives of heparin fragments were also very active in reversing the de-differentiation of smooth muscle cell in culture, as estimated by the increase in the expression of alpha-smooth muscle actin and alpha-smooth muscle actin mRNA.
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MESH Headings
- Actins/biosynthesis
- Acylation
- Animals
- Aorta, Thoracic
- Blotting, Northern
- Blotting, Western
- Cell Division/drug effects
- Cells, Cultured
- Electrophoresis, Polyacrylamide Gel
- Fluorescent Antibody Technique
- Glycosaminoglycans/metabolism
- Glycosaminoglycans/pharmacology
- Heparin/analogs & derivatives
- Heparin/chemistry
- Heparin/metabolism
- Heparin/pharmacology
- In Vitro Techniques
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/metabolism
- RNA, Messenger/biosynthesis
- Rabbits
- Rats
- Rats, Sprague-Dawley
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Affiliation(s)
- T Bârzu
- Centre Choay, Gentilly, France
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11
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Grainger DW, Knutson K, Kim SW, Feijen J. Poly(dimethylsiloxane)-poly(ethylene oxide)-heparin block copolymers. II: Surface characterization and in vitro assessments. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 1990; 24:403-31. [PMID: 2347871 DOI: 10.1002/jbm.820240402] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Amphiphilic block copolymers containing poly(dimethylsiloxane), poly(ethylene oxide), as well as heparin-coated glass beads and tubes were evaluated for the amounts and activities of surface-immobilized heparin. Because the amphiphilic copolymer system is thermodynamically predicted to demonstrate low-energy phase enrichment on the surfaces of air-cast films, studies were also undertaken to understand the in vitro results. Solvent-cast copolymer films have a heterogeneous microphase-separated structure according to transmission electron micrographs. Wilhelmy plate contact angle analysis indicates significant surface restructuring occurs upon hydration. Attenuated total reflectance infrared spectroscopy studies of the desiccated and hydrated films at two different sampling depths show compositional heterogeneity as a function of depth, as well as near surface restructuring allowing surface enrichment of the high-energy segments following contact with water. Significant concentrations of heparin are detected on the surface of these coatings by toluidine blue assays. In addition, a portion of the surface-bound heparin maintains its original bioactivity as determined by recalcification times, thrombin times, and Factor Xa assays. These substrates were also tested for platelet adhesion and activation reactions in vitro using polymer-coated beads in rabbit platelet-rich plasma. Heparinized polymers promoted low levels of platelet adhesion and serotonin release. Surface concentrations of heparin from bioactivity assays were then correlated with platelet adhesion and the extent of platelet release to assess the efficacy of this heparin-immobilized copolymer as a blood-compatible material or coating.
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Affiliation(s)
- D W Grainger
- Department of Pharmaceutics, University of Utah, Salt Lake City 84112
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12
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VILLANUEVA GERMANB, NAKAJIMA MOTOWO, NICOLSON GARTHL. Heparin Derivatives as Inhibitors of Heparanase from Metastatic Melanoma Cells. Ann N Y Acad Sci 1989. [DOI: 10.1111/j.1749-6632.1989.tb22548.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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13
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Structural changes in the NH2-terminal domain of fibronectin upon interaction with heparin. Relationship to matrix-driven translocation. J Biol Chem 1988. [DOI: 10.1016/s0021-9258(18)37960-2] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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14
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Grainger DW, Kim SW, Feijen J. Poly(dimethylsiloxane)-poly(ethylene oxide)-heparin block copolymers. I. Synthesis and characterization. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 1988; 22:231-49. [PMID: 3360815 DOI: 10.1002/jbm.820220307] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Amphiphilic block copolymers containing poly(dimethylsiloxane), poly(ethylene oxide), and heparin (PDMS-PEO-Hep) have been prepared via a series of coupling reactions using functionalized prepolymers, diisocyanates, and derivatized heparins. All intermediate steps of the synthesis yield quantifiable products with reactive end-groups, while the final products demonstrate bioactive, covalently bound heparin moieties. Due to the solvent systems required, commercial sodium heparin was converted to its benzyltrimethyl ammonium salt to enhance its solubility. The same procedure was applied to heparin degraded by nitrous acid in order to covalently couple it in solutions with the semitelechelic copolymers. As might be expected, this derivatization reduces the apparent bioactivity of the heparin. However, preliminary findings suggest that the bioactivity can be restored by reforming the heparin sodium salt.
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Affiliation(s)
- D W Grainger
- Department of Pharmaceutics, University of Utah, Salt Lake City
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15
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Abstract
The uronic acid carboxyl groups of a heparin fraction with high anticoagulant activity, were converted to the methyl ester by treatment with diazomethane. The product obtained after purification did not have the characteristic activity of heparin in accelerating the inhibition of thrombin or factor Xa, by antithrombin. Esterification also abolished the binding of heparin to antithrombin as measured by changes in the intrinsic fluorescence. It is concluded that free carboxyl groups are essential for the activity of heparin.
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17
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Villanueva GB, Allen N. Effect of heparin modification on its circular dichroism spectrum. Biochem Biophys Res Commun 1984; 123:973-80. [PMID: 6487338 DOI: 10.1016/s0006-291x(84)80229-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The effect of modification of the carboxyl groups of high affinity heparin was investigated. The binding affinity toward antithrombin III decreases in the following order: Heparin greater than heparin methyl ester greater than heparinylglycine greater than heparinylglycine methyl ester. This result agrees qualitatively with the previous studies using unfractionated heparin. Esterification of the carboxyl groups (i.e., HME) does not affect the CD profile of heparin at 210 nm but introduction of a bulkier glycine methyl ester (i.e., HGME) leads to formation of a very intense band at 235 nm. Based on reported CD analyses of uronic acid derivatives and our model building studies, it is concluded that the large difference in CD spectra of HGME as compared to unmodified heparin and HME is due to a change in ring conformation of the uronic acid moiety (i.e., 4C1 to 1C4 or vice versa).
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Predictions of the secondary structure of antithrombin III and the location of the heparin-binding site. J Biol Chem 1984. [DOI: 10.1016/s0021-9258(17)43385-0] [Citation(s) in RCA: 56] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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19
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Hennink WE, Feijen J, Ebert CD, Kim SW. Covalently bound conjugates of albumin and heparin: synthesis, fractionation and characterization. Thromb Res 1983; 29:1-13. [PMID: 6836542 DOI: 10.1016/0049-3848(83)90120-2] [Citation(s) in RCA: 53] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Covalently bound conjugates of human serum albumin and heparin were prepared as compounds which could improve the blood-compatibility of polymer surfaces either by preadsorption or by covalent coupling of the conjugates onto blood contacting surfaces. The conjugates (10-16 weight % of heparin) were obtained by a condensation reaction between albumin and heparin using 1-ethyl-3-(dimethylaminopropyl)-carbodiimide. Unreacted albumin and heparin were removed by diethyl-aminoethyl (DEAE)-cellulose and Cibacron Blue Sepharose chromatography respectively. The activity of the heparin component incorporated in the albumin-heparin conjugates (Ac) was compared with that of the heparin used for the synthesis of the conjugates (Anat) by thrombin time, inhibition of Factor Xa and the activated partial thromboplastin time (APTT) assays. The Ac/Anat ratio for the above assays was as follows: Thrombin time 1.25, Factor Xa inhibition 0.5. and APTT 0.5. Gel filtration chromatography showed broad-molecular weight distributions. The conjugates were fractionated using immobilized antithrombin III (ATIII). High ATIII and low ATIII affinity conjugate fractions showed the same behavior as ATIII fractionated heparin with respect to thrombin times and Factor Xa inhibition.
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20
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Ceustermans R, Hoylaerts M, De Mol M, Collen D. Preparation, characterization, and turnover properties of heparin-antithrombin III complexes stabilized by covalent bonds. J Biol Chem 1982. [DOI: 10.1016/s0021-9258(18)34791-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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21
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Danishefsky I, Pixley R. Effect of heparin on the inhibition of thrombin by alpha 1-proteinase inhibitor. Biochem Biophys Res Commun 1979; 91:862-70. [PMID: 316700 DOI: 10.1016/0006-291x(79)91959-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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22
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Danishefsky I, Ahrens M, Klein S. Effect of heparin modification on its activity in enhancing the inhibition of thrombin by antithrombin III. BIOCHIMICA ET BIOPHYSICA ACTA 1977; 498:215-22. [PMID: 560216 DOI: 10.1016/0304-4165(77)90101-5] [Citation(s) in RCA: 38] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Studies were conducted to determine the effect of modifying specific functional groups of heparin on its antithrombin III-enhancing activity. The derivatives employed were heparin methyl ester, heparinylglycine and N-desulfated heparin. The carboxyl-modified derivatives increase the rate of inhibition of thrombin by antithrombin III, although not to the same extent as heparin. N-Desulfated heparin is devoid of any activity. Heparin methyl ester is more potent than heparinylglycine in activating antithrombin III, as exhibited by its immediate effect on the thrombin-fibrinogen reaction. However, heparinylglycine is the more effective of the two, in increasing the rate of thrombin deactivation by antithrombin III. The results indicate that although free carboxyl groups of heparin are not crucial for its binding to antithrombin III, they are important for the combination of the latter with thromobin. In contrast, N-sulfates are critical for the interaction of heparin with antithrombin III.
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23
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Danishefsky I. Synthesis and properties of heparin derivatives. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 1975; 52:105-18. [PMID: 164761 DOI: 10.1007/978-1-4684-0946-8_9] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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