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Godoi KSD, Guidolin FR, Portaro FCV, Spencer PJ, da Silva WD. Anti-Metalloproteases: Production and Characterization of Polyclonal IgG Anti-F2 Fraction Antibodies Purified from the Venom of the Snake Bitis arietans. Toxins (Basel) 2023; 15:toxins15040264. [PMID: 37104202 PMCID: PMC10145261 DOI: 10.3390/toxins15040264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 03/20/2023] [Accepted: 03/27/2023] [Indexed: 04/05/2023] Open
Abstract
Bitis arietans is a medically important snake found in Sub-Saharan Africa. The envenomation is characterized by local and systemic effects, and the lack of antivenoms aggravates the treatment. This study aimed to identify venom toxins and develop antitoxins. The F2 fraction obtained from Bitis arietans venom (BaV) demonstrated the presence of several proteins in its composition, including metalloproteases. Titration assays carried out together with the immunization of mice demonstrated the development of anti-F2 fraction antibodies by the animals. The determination of the affinity of antibodies against different Bitis venoms was evaluated, revealing that only BaV had peptides recognized by anti-F2 fraction antibodies. In vivo analyses demonstrated the hemorrhagic capacity of the venom and the effectiveness of the antibodies in inhibiting up to 80% of the hemorrhage and 0% of the lethality caused by BaV. Together, the data indicate: (1) the prevalence of proteins that influence hemostasis and envenomation; (2) the effectiveness of antibodies in inhibiting specific activities of BaV; and (3) isolation and characterization of toxins can become crucial steps in the development of new alternative treatments. Thus, the results obtained help in understanding the envenoming mechanism and may be useful for the study of new complementary therapies.
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Affiliation(s)
| | | | | | - Patrick Jack Spencer
- Biotechnology Center, Nuclear and Energy Research Institute, São Paulo 05508-000, Brazil
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2
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Husain Z, Wicaksono AC, Renault A, Md Zhahir SS, Ismail AK. A case of fatal envenomation by a captive puff adder (Bitis arietans) in Malaysia. Toxicon 2023; 224:107023. [PMID: 36640813 DOI: 10.1016/j.toxicon.2023.107023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Revised: 01/01/2023] [Accepted: 01/05/2023] [Indexed: 01/13/2023]
Abstract
The Puff Adder (Bitis arietans) is a viper native to Africa and the Middle East. Envenomation by this species often requires the administration of appropriate antivenom in order to achieve a favorable outcome. A patient was bitten in both hands by a captive B. arietans presented to a teaching hospital in Malaysia. The patient developed painful progressive swelling on both limbs that extended to the chest, hypotension, hypokalemia with worsening anemia, thrombocytopenia, coagulopathy, and severe metabolic acidosis. The patient was managed supportively while waiting for the appropriate antivenom, Antivipmyn-Africa, from the Singapore Zoo. The patient developed cardiorespiratory arrest twice and did not recover from the second. The patient was pronounced dead 23 hours post-incident. The local unavailability of the appropriate antivenom may be the most important factor that contributed to the patient's death. There is also a need to amend the Malaysian Wildlife Act in order to prevent such cases from recurring.
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Affiliation(s)
- Zulfahimi Husain
- Department of Emergency Medicine, Faculty of Medicine, University Kebangsaan Malaysia, Jalan Yaacob Latif, Bandar Tun Razak, Kuala Lumpur, Malaysia
| | - Aji Caesar Wicaksono
- Department of Emergency Medicine, Faculty of Medicine, University Kebangsaan Malaysia, Jalan Yaacob Latif, Bandar Tun Razak, Kuala Lumpur, Malaysia
| | - Asyhok Renault
- Department of Emergency Medicine, Faculty of Medicine, University Kebangsaan Malaysia, Jalan Yaacob Latif, Bandar Tun Razak, Kuala Lumpur, Malaysia
| | - Siti Sarah Md Zhahir
- Department of Emergency Medicine, Faculty of Medicine, University Kebangsaan Malaysia, Jalan Yaacob Latif, Bandar Tun Razak, Kuala Lumpur, Malaysia
| | - Ahmad Khaldun Ismail
- Department of Emergency Medicine, Faculty of Medicine, University Kebangsaan Malaysia, Jalan Yaacob Latif, Bandar Tun Razak, Kuala Lumpur, Malaysia.
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3
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How snake venom disintegrins affect platelet aggregation and cancer proliferation. Toxicon 2022; 221:106982. [DOI: 10.1016/j.toxicon.2022.106982] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Revised: 11/21/2022] [Accepted: 11/22/2022] [Indexed: 11/25/2022]
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Cesar PHS, Braga MA, Trento MVC, Menaldo DL, Marcussi S. Snake Venom Disintegrins: An Overview of their Interaction with Integrins. Curr Drug Targets 2019; 20:465-477. [DOI: 10.2174/1389450119666181022154737] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2018] [Revised: 10/16/2018] [Accepted: 10/17/2018] [Indexed: 12/12/2022]
Abstract
Disintegrins are non-enzymatic proteins that interfere on cell–cell interactions and signal transduction, contributing to the toxicity of snake venoms and play an essential role in envenomations. Most of their pharmacological and toxic effects are the result of the interaction of these molecules with cell surface ligands, which has been widely described and studied. These proteins may act on platelets, leading to hemorrhage, and may also induce apoptosis and cytotoxicity, which highlights a high pharmacological potential for the development of thrombolytic and antitumor agents. Additionally, these molecules interfere with the functions of integrins by altering various cellular processes such as migration, adhesion and proliferation. This review gathers information on functional characteristics of disintegrins isolated from snake venoms, emphasizing a comprehensive view of the possibility of direct use of these molecules in the development of new drugs, or even indirectly as structural models.
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Affiliation(s)
- Pedro Henrique Souza Cesar
- Department of Chemistry, Biochemistry Laboratory, Federal University of Lavras (UFLA), Lavras, Minas Gerais, 37200-000, Brazil
| | - Mariana Aparecida Braga
- Department of Chemistry, Biochemistry Laboratory, Federal University of Lavras (UFLA), Lavras, Minas Gerais, 37200-000, Brazil
| | - Marcus Vinicius Cardoso Trento
- Department of Chemistry, Biochemistry Laboratory, Federal University of Lavras (UFLA), Lavras, Minas Gerais, 37200-000, Brazil
| | - Danilo Luccas Menaldo
- Department of Clinical Analyses, Toxicology and Food Sciences, School of Pharmaceutical Sciences of Ribeirão Preto, University of Sao Paulo (FCFRP-USP), Ribeirão Preto-SP, Brazil
| | - Silvana Marcussi
- Department of Chemistry, Biochemistry Laboratory, Federal University of Lavras (UFLA), Lavras, Minas Gerais, 37200-000, Brazil
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Megale ÂAA, Magnoli FC, Kuniyoshi AK, Iwai LK, Tambourgi DV, Portaro FCV, da Silva WD. Kn-Ba: a novel serine protease isolated from Bitis arietans snake venom with fibrinogenolytic and kinin-releasing activities. J Venom Anim Toxins Incl Trop Dis 2018; 24:38. [PMID: 30564275 PMCID: PMC6293559 DOI: 10.1186/s40409-018-0176-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2018] [Accepted: 12/03/2018] [Indexed: 01/17/2023] Open
Abstract
Background Bitis arietans is a venomous snake found in sub-Saharan Africa and in parts of Morocco and Saudi Arabia. The envenomation is characterized by local and systemic reactions including pain, blistering, edema and tissue damage, besides hemostatic and cardiovascular disturbances, which can cause death or permanent disabilities in its victims. However, the action mechanisms that provoke these effects remain poorly understood, especially the activities of purified venom components. Therefore, in order to elucidate the molecular mechanisms that make the Bitis arietans venom so potent and harmful to human beings, this study reports the isolation and biochemical characterization of a snake venom serine protease (SVSP). Methods Solubilized venom was fractionated by molecular exclusion chromatography and the proteolytic activity was determined using fluorescent substrates. The peaks that showed serine protease activity were determined by blocking the proteolytic activity with site-directed inhibitors. In sequence, the fraction of interest was submitted to another cycle of molecular exclusion chromatography. The purified serine protease was identified by mass spectrometry and characterized biochemically and immunochemically. Results A serine protease of 33 kDa with fibrinogen-degrading and kinin-releasing activities was isolated, described, and designated herein as Kn-Ba. The experimental Butantan Institute antivenom produced against Bitis arietans venom inhibited the Kn-Ba activity. Conclusions The in vitro activities of Kn-Ba can be correlated with the capacity of the venom to provoke bleeding and clotting disorders as well as hypotension, which are common symptoms presented by envenomed victims. Obtaining satisfactory Kn-Ba inhibition through the experimental antivenom is important, given the WHO’s recommendation of immunotherapy in cases of human accidents with venomous snakes. Electronic supplementary material The online version of this article (10.1186/s40409-018-0176-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
| | | | | | - Leo Kei Iwai
- 2Special Laboratory of Applied Toxinology / Center of Toxins, Immune-Response and Cell Signaling (CeTICS), Butantan Institute, São Paulo, 05503-900 Brazil
| | - Denise V Tambourgi
- 1Immunochemistry Laboratory, Butantan Institute, São Paulo, 05503-900 Brazil
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Kuo YJ, Chen YR, Hsu CC, Peng HC, Huang TF. An α IIb β 3 antagonist prevents thrombosis without causing Fc receptor γ-chain IIa-mediated thrombocytopenia. J Thromb Haemost 2017; 15:2230-2244. [PMID: 28815933 DOI: 10.1111/jth.13803] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2017] [Indexed: 12/26/2022]
Abstract
Essentials FcγRIIa-mediated thrombocytopenia is associated with drug-dependent antibodies (DDAbs). We investigated the correlation between αIIb β3 binding epitopes and induction of DDAbs. An FcγRIIa-transgenic mouse model was used to evaluate thrombocytopenia among anti-thrombotics. An antithrombotic with binding motif toward αIIb β-propeller domain has less bleeding tendency. SUMMARY Background Thrombocytopenia, a common side effect of Arg-Gly-Asp-mimetic antiplatelet drugs, is associated with drug-dependent antibodies (DDAbs) that recognize conformation-altered integrin αIIb β3 . Objective To explore the correlation between αIIb β3 binding epitopes and induction of DDAb binding to conformation-altered αIIb β3 , we examined whether two purified disintegrins, TMV-2 and TMV-7, with distinct binding motifs have different effects on induction of αIIb β3 conformational change and platelet aggregation in the presence of AP2, an IgG1 inhibitory mAb raised against αIIb β3 . Methods We investigated the possible mechanisms of intrinsic platelet activation of TMV-2 and TMV-7 in the presence of AP2 by examining the signal cascade, tail bleeding time and immune thrombocytopenia in Fc receptor γ-chain IIa (FcγRIIa) transgenic mice. Results TMV-7 has a binding motif that recognizes the αIIb β-propeller domain of αIIb β3 , unlike that of TMV-2. TMV-7 neither primed the platelets to bind ligand, nor caused a conformational change of αIIb β3 as identified with the ligand-induced binding site mAb AP5. In contrast to eptifibatide and TMV-2, cotreatment of TMV-7 with AP2 did not induce FcγRIIa-mediated platelet aggregation and the downstream activation cascade. Both TMV-2 and TMV-7 efficaciously prevented occlusive thrombosis in vivo. Notably, both eptifibatide and TMV-2 caused severe thrombocytopenia mediated by FcγRIIa, prolonged tail bleeding time in vivo, and repressed human whole blood coagulation indexes, whereas TMV-7 did not impair hemostatic capacity. Conclusions TMV-7 shows antiplatelet and antithrombotic activities resulting from a mechanism different from that of all other tested αIIb β3 antagonists, and may offer advantages as a therapeutic agent with a better safety profile.
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Affiliation(s)
- Y-J Kuo
- Graduate Institute of Pharmacology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Y-R Chen
- Graduate Institute of Pharmacology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - C-C Hsu
- Graduate Institute of Pharmacology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - H-C Peng
- Graduate Institute of Pharmacology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - T-F Huang
- Graduate Institute of Pharmacology, College of Medicine, National Taiwan University, Taipei, Taiwan
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7
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African adders: partial characterization of snake venoms from three Bitis species of medical importance and their neutralization by experimental equine antivenoms. PLoS Negl Trop Dis 2015; 9:e0003419. [PMID: 25643358 PMCID: PMC4340965 DOI: 10.1371/journal.pntd.0003419] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2014] [Accepted: 11/15/2014] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND An alarming number of fatal accidents involving snakes are annually reported in Africa and most of the victims suffer from permanent local tissue damage and chronic disabilities. Envenomation by snakes belonging to the genus Bitis, Viperidae family, are common in Sub-Saharan Africa. The accidents are severe and the victims often have a poor prognosis due to the lack of effective specific therapies. In this study we have biochemically characterized venoms from three different species of Bitis, i.e., Bitis arietans, Bitis gabonica rhinoceros and Bitis nasicornis, involved in the majority of the human accidents in Africa, and analyzed the in vitro neutralizing ability of two experimental antivenoms. METHODOLOGY/PRINCIPAL FINDINGS The data indicate that all venoms presented phospholipase, hyaluronidase and fibrinogenolytic activities and cleaved efficiently the FRET substrate Abz-RPPGFSPFRQ-EDDnp and angiotensin I, generating angiotensin 1-7. Gelatinolytic activity was only observed in the venoms of B. arietans and B. nasicornis. The treatment of the venoms with protease inhibitors indicated that Bitis venoms possess metallo and serinoproteases enzymes, which may be involved in the different biological activities here evaluated. Experimental antivenoms produced against B. arietans venom or Bitis g. rhinoceros plus B. nasicornis venoms cross-reacted with the venoms from the three species and blocked, in different degrees, all the enzymatic activities in which they were tested. CONCLUSION These results suggest that the venoms of the three Bitis species, involved in accidents with humans in the Sub-Saharan Africa, contain a mixture of various enzymes that may act in the generation and development of some of the clinical manifestations of the envenomations. We also demonstrated that horse antivenoms produced against B. arietans or B. g. rhinoceros plus B. nasicornis venoms can blocked some of the toxic activities of these venoms.
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McLane MA, Zhang X, Tian J, Paquette-Straub C. MONOMERIC AND DIMERIC DISINTEGRINS: PLATELET ACTIVE AGENTS FROM VIPER VENOM. TOXIN REV 2008. [DOI: 10.1080/15569540600567420] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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9
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Wang WJ, Shih CH, Huang TF. Primary structure and antiplatelet mechanism of a snake venom metalloproteinase, acurhagin, from Agkistrodon acutus venom. Biochimie 2005; 87:1065-77. [PMID: 16023283 DOI: 10.1016/j.biochi.2005.06.002] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2005] [Accepted: 06/06/2005] [Indexed: 10/25/2022]
Abstract
Acurhagin has been characterized as a P-III hemorrhagic metalloproteinase. We herein report the complete sequence of acurhagin by molecular cloning. Analysis of the cDNA-predicted amino acid sequence encoding acurhagin precursor revealed that this mosaic Asn-linked glycoprotein possesses a multidomain structure including a proprotein, a metalloproteinase, a disintegrin-like and a cysteine-rich domains (189/205/102/114 residues), with an overall 87% identity to that of jararhagin, an integrin alpha2beta1-cleaving metalloproteinase. Acurhagin has a Ser-Glu-Cys-Asp sequence in the disintegrin-like domain instead of the typical Arg-Gly-Asp motif. In contrast to inhibiting fibrinogen-integrin alphaIIbbeta3 interaction by disintegrins, acurhagin selectively showed a dose-dependent inhibition on platelet aggregation induced by collagen, and suppression on tyrosine phosphorylation of several signaling proteins in convulxin-stimulated platelets. Although the immobilized acurhagin was shown to bind platelet GPVI and collagen in a primary structure- and steric conformation-dependent manner, respectively, the mechanism of acurhagin under short incubation is mainly through its binding to GPVI and collagen, instead of binding to alpha2beta1, or cleaving platelet membrane glycoproteins. Moreover, the molecular conformation maintained by divalent cations is required for the proteolytic activity of acurhagin toward extracellular matrix fibronectin. Taken together, these results suggest that all the three domains in mature acurhagin may cooperatively contribute to its biological function.
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Affiliation(s)
- Wen-Jeng Wang
- Chang-Gung Institute of Technology, Kwei-Shan, Tao-Yuan, Taiwan, ROC
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10
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Liu JW, Du XY, Liu P, Chen X, Xu JM, Wu XF, Zhou YC. Purification, characterization, and cDNA sequence of halysetin, a disintegrin-like/cysteine-rich protein from the venom of Agkistrodon halys Pallas. Biochem Biophys Res Commun 2000; 278:112-8. [PMID: 11185525 DOI: 10.1006/bbrc.2000.3724] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
By means of DEAE-Sepharose CL-6B column chromatography, gel filtration on Sephadex G-75 and Superose 12 FPLC, halysetin, an antiplatelet protein, was purified from the venom of Agkistrodon halys Pallas with molecular mass of 29 kDa on SDS-PAGE and 23,168 Da by mass spectrometry. The p1 was about 5.0. Halysetin was devoid of phospholipase A2, fibrino-(geno)lytic, esterase, hemorrhagenic activities. Halysetin dose-dependently inhibited the aggregation of human platelet, which was stimulated by collagen with IC50 of 420 nM, but not that stimulated by ADP. The N-and C-terminal sequences of halysetin were characterized. Its full-length cDNA was cloned by RT-PCR from the total RNA extracted from the snake venom gland. It encoded a protein of 212-amino-acid residues with disintegrin-like/cysteine-rich domains and was highly homologous with SYMPs (snake venom metalloprotease).
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Affiliation(s)
- J W Liu
- Institute of Biochemistry, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences
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11
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Yeh CH, Peng HC, Huang TF. Cytokines modulate integrin alpha(v)beta(3)-mediated human endothelial cell adhesion and calcium signaling. Exp Cell Res 1999; 251:57-66. [PMID: 10438571 DOI: 10.1006/excr.1999.4560] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Angiogenesis is a complex process regulated by the interactions of endothelial cells with cytokines and the adhesive protein matrix. The cytokines basic fibroblast growth factor (bFGF) and tumor necrosis factor-alpha (TNF-alpha) are two of the modulators of angiogenesis. One mechanism by which these cytokines induce their effects may be through the regulation of integrin adhesion receptor activity, in particular, alpha(v)beta(3). In this study, we examined the ability of these angiogenic factors to modulate the adhesion of human umbilical vein endothelial cells (HUVECs) to immobilized disintegrins (i.e., rhodostomin and arietin), which are specific in antagonizing integrin alpha(v)beta(3) in cells. As these disintegrins were immobilized as substrates, they acted as agonists to induce HUVEC adhesion in a dose- and alpha(v)beta(3)-dependent manner. In addition, adhesion also triggered a sustained increase of intracellular free calcium. Furthermore, bFGF-primed HUVECs potentiated, but TNF-alpha primed cells attenuated, about 50% adhesion events and calcium signaling triggered by immobilized disintegrin compared to naive cells, respectively. The mechanisms of modulating alpha(v)beta(3)-dependent HUVEC adhesion by cytokines may be related to changes of integrin alpha(v)beta(3) conformation, as demonstrating the antagonistic effect of Mn(2+) on decreased adhesion by TNF-alpha pretreatment, and confirmed with flow cytometric analysis probed by anti-LIBS1 mAb. However, cytokine pretreatment did not alter the expression of this integrin on the cell surface, as determined by flow cytometry. Phosphoinositide-3 kinase may be one of the signaling molecules involved in the enhanced adhesion of bFGF-primed cells.
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Affiliation(s)
- C H Yeh
- College of Medicine, National Taiwan University, Taipei, Taiwan
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12
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Yeh CH, Peng HC, Yih JB, Huang TF. A new short chain RGD-containing disintegrin, accutin, inhibits the common pathway of human platelet aggregation. BIOCHIMICA ET BIOPHYSICA ACTA 1998; 1425:493-504. [PMID: 9838213 DOI: 10.1016/s0304-4165(98)00104-4] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
A new short-chain disintegrin, accutin, was purified from the Formosan Agkistrodon acutus venom by using of gel filtration, ion exchanger and reverse phase HPLC. The homogeneous protein is a 47-residue polypeptide with a molecular mass of 5241 Da containing an Arg-Gly-Asp sequence and seven cysteinyl residues at positions highly homologous to other disintegrins. Accutin dose-dependently inhibited human platelet aggregation stimulated by ADP, collagen, thrombin or the thromboxane analogue U46619 in platelet suspension with IC50 values of 66-267 nM. It was also active in inhibiting platelet aggregation of platelet-rich plasma. However, accutin apparently did not affect the shape change caused by these agonists. Accutin also inhibited fibrinogen-induced aggregation of human elastase-treated platelets in a dose-dependent manner. Furthermore, accutin dose-dependently inhibited the binding reaction of fluorescein isothiocyanate (FITC)-conjugated arietin, a member of the disintegrin family, to human platelets. In addition, the binding of FITC-conjugated accutin to platelets was almost completely blocked by a monoclonal antibody, 7E3, raised against the platelet glycoprotein IIb/IIIa complex. On the other hand, accutin as well as other disintegrins, rhodostomin and arietin, exhibited an inhibitory effect on 7E3 binding toward platelets and endothelial cells in a dose-dependent manner. It is concluded that accutin, a new platelet aggregation inhibitor belonging to the short-chain disintegrin family, acts specifically on a binding epitope of GPIIb/IIIa overlapping with that of 7E3, leading to the blockade of fibrinogen binding to its receptor.
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Affiliation(s)
- C H Yeh
- Pharmacological Institute, College of Medicine, National Taiwan University, No. 1, Sec. 1, Jen-Ai Rd, Taipei, Taiwan
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13
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Huang TF, Chang MC, Peng HC, Teng CM. A novel alpha-type fibrinogenase from Agkistrodon rhodostoma snake venom. BIOCHIMICA ET BIOPHYSICA ACTA 1992; 1160:262-8. [PMID: 1477097 DOI: 10.1016/0167-4838(92)90086-s] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
By means of CM-Sephadex C-50 column chromatography, gel-filtration on sephadex G-75 and Sephacryl S-200 columns, a purified fibrinogenase, kistomin, was obtained from venom of Agkistrodon rhodostoma. It was a single peptide-chain with a molecular mass of about 21,800 Da containing about 202 amino-acid residues as revealed by amino acid analysis. Kistomin preferentially cleaved A alpha- and subsequently the gamma-chain of fibrinogen, leaving the B beta-chain unaffected. Its fibrinogenolytic activity was estimated to be 36.6 +/- 4.5 mg/min per mg protein and was inhibited by the pretreatment of EDTA, suggesting that it is a metalloproteinase. Its fibrinogenolytic activity in platelet-poor plasma is much less potent as compared to that in purified fibrinogen solution. It inhibited ristocetin-induced aggregation of human platelets in a dose-dependent manner in the presence of von Willebrand factor.
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Affiliation(s)
- T F Huang
- Pharmacological Institute, College of Medicine, National Taiwan University, Taipei
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14
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Huang TF, Peng HC, Peng IS, Teng CM, Ouyang C. An antiplatelet peptide, gabonin, from Bitis gabonica snake venom. Arch Biochem Biophys 1992; 298:13-20. [PMID: 1524422 DOI: 10.1016/0003-9861(92)90087-d] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Interaction of fibrinogen with its receptors (glycoprotein IIb/IIIa complex) on platelet membranes leads to platelet aggregation. By means of gel filtration, CM-Sephadex C-50, and reverse-phase HPLC, an antiplatelet peptide, gabonin, was purified from the venom of Bitis gabonica. The purified protein migrates as a 21,100-Da polypeptide on sodium dodecyl sulfate-polyacrylamide gel electrophoresis under nonreducing conditions and as a 11,000-Da peptide in the presence of beta-mercaptoethanol, indicating that gabonin is a disulfide-linked dimer. It is a polypeptide consisting of about 84 amino acid residues, rich in Asp, Pro, and half-cystine. Gabonin dose-dependently inhibited human platelet aggregation stimulated by ADP, collagen, U46619, or thrombin in preparations of platelet-rich plasma and platelet suspension (IC50 = 340-1600 nM). It also blocked platelet aggregation of whole blood. However, it apparently did not affect the initial shape change and only slightly reduced ATP release caused by aggregation agonists. Gabonin did not inhibit the rise of cytosolic calcium in Quin-2-loaded platelets stimulated by thrombin. In addition, gabonin dose-dependently inhibited fibrinogen-induced aggregation of elastase-treated platelets. In conclusion, gabonin inhibits platelet aggregation mainly through the blockade of fibrinogen binding toward fibrinogen receptors of the activated platelets.
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Affiliation(s)
- T F Huang
- Pharmacological Institute, College of Medicine, National Taiwan University, Taipei
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15
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Ouyang C, Teng CM, Huang TF. Characterization of snake venom components acting on blood coagulation and platelet function. Toxicon 1992; 30:945-66. [PMID: 1440652 DOI: 10.1016/0041-0101(92)90040-c] [Citation(s) in RCA: 100] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Snake venoms can affect blood coagulation and platelet function in various ways. The physicochemical properties and the mechanisms of actions of the snake venom components affecting blood coagulation and platelet function are discussed.
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Affiliation(s)
- C Ouyang
- Department of Pharmacology, College of Medicine, National Taiwan University, Taipei, R.O.C
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16
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Huang TF, Wang WJ, Teng CM, Ouyang C. Mechanism of action of the antiplatelet peptide, arietin, from Bitis arietans venom. BIOCHIMICA ET BIOPHYSICA ACTA 1991; 1074:144-50. [PMID: 2043664 DOI: 10.1016/0304-4165(91)90053-j] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Arietin, an Arg-Gly-Asp containing peptide from venom of Bitis arietans, inhibited aggregation of platelets stimulated by a variety of agonists with a similar IC50, 1.3-2.7.10(-7) M. It blocked aggregation through the interference of fibrinogen binding to fibrinogen receptors on platelet surface. In this paper, we further demonstrated that arietin had no significant effect on the intracellular mobilization of Ca2+ in Quin2-AM-loaded platelets stimulated by thrombin. It inhibited 125I-fibrinogen binding to ADP-stimulated platelets in a competitive manner (IC50, 1.1.10(-7) M). 125I-arietin bound to unstimulated, ADP-stimulated and elastase-treated platelets in a saturable manner and its Kd values were estimated to be 3.4.10(-7), 3.4.10(-8) and 6.5.10(-8) M, respectively, while the corresponding binding sites were 46,904, 48,958 and 34,817 per platelet, respectively. Arg-Gly-Asp-Ser (RGDS) inhibited 125I-arietin binding to ADP-stimulated platelets in a competitive manner. RGD-containing peptides, including trigramin and rhodostomin, EDTA and monoclonal antibody, 7E3, raised against glycoprotein IIb-IIIa complex, inhibited 125I-arietin binding to ADP-stimulated platelets, indicating that the binding sites of arietin appear to be located at or near glycoprotein IIb-IIIa complex. In conclusion, arietin and other RGD-containing trigramin-like peptides preferentially bind to the fibrinogen receptors associated with glycoprotein IIb-IIIa complex of the activated platelets, thus leading to the blockade of fibrinogen binding to its receptors and subsequent aggregation. The presence of RGD of arietin is essential for the expression of its biological activity. Its binding sites are overlapped with those of trigramin, rhodostomin and the monoclonal antibody, 7E3.
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Affiliation(s)
- T F Huang
- Pharmacological Institute, College of Medicine, National Taiwan University, Taipei
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