Open Access

Heterologous fibrin sealant derived from snake venom: from bench to bedside – an overview

  • Rui Seabra FerreiraJr1, 2, 4Email author,
  • Luciana Curtolo de Barros2,
  • Luciana Patrícia Fernandes Abbade3,
  • Silvia Regina Catharino Sartori Barraviera3,
  • Maria Regina Cavariani Silvares3,
  • Leticia Gomes de Pontes1, 2,
  • Lucilene Delazari dos Santos1, 2 and
  • Benedito Barraviera1, 2
Journal of Venomous Animals and Toxins including Tropical Diseases201723:21

https://doi.org/10.1186/s40409-017-0109-8

Received: 14 January 2017

Accepted: 16 March 2017

Published: 4 April 2017

Abstract

Hemostatic and adhesive agents date back to World War II, when homologous fibrin sealant came onto scene. Considering that infectious diseases can be transmitted via human blood, a new heterologous fibrin sealant was standardized in the 1990s. Its components were a serine protease (a thrombin-like enzyme) extracted from the venom of Crotalus durissus terrificus snakes and a fibrinogen-rich cryoprecipitate extracted from the blood of Bubalus bubalis buffaloes. This new bioproduct has been used as a coagulant, sealant, adhesive and recently as a candidate scaffold for mesenchymal stem cells and bone and cartilage repair. This review discusses the composition of a new heterologous fibrin sealant, and cites published articles related to its preclinical applications aiming at repairing nervous system traumas and regenerating bone marrow. Finally, we present an innovative safety trial I/II that found the product to be a safe and clinically promising candidate for treating chronic venous ulcers. A multicenter clinical trial, phase II/III, with a larger number of participants will be performed to prove the efficacy of an innovative biopharmaceutical product derived from animal venom.

Keywords

Fibrin sealant Snake venom Cryoprecipitate coagulum Thrombin-like enzyme Buffaloes

Background

The first research studies on hemostatic agents and adhesives date back to World War II, when fibrin glue was proposed. In that time, a mixture of human fibrinogen and thrombin was applied to the affected aera. In 1970, given that the basic principles for extracting fibrinogen-rich cryoprecipitate and coagulation factors were already known, the concept of fibrin glue was reevaluated. Since that point, a new adhesive has been standardized with the following composition: fibrinogen-rich human cryoprecipitate, bovine thrombin and calcium chloride as the diluent. This sealant was successfully commercialized for years [1, 2].

In 1978, the U.S. Food and Drug Administration (FDA) suspended its commercialization due to the possibility of the transmission of infectious diseases, carried via products derived from human blood [3, 4].

In order to overcome these difficulties, in the 1990s the Center for the Study of Venoms and Venomous Animals (CEVAP) at São Paulo State University (UNESP) initiated studies to achieve the standardization of a new heterologous fibrin sealant (HFS). After several experiments, a new sealant was proposed, which was composed of a fibrinogen-rich cryoprecipitate extracted from the blood of the buffalo Bubalus bubalis in association with a serine protease (a thrombin-like enzyme) extracted from Crotalus durissus terrificus venom [58].

The active ingredient of this new heterologous fibrin sealant mimics the final step of the coagulation cascade. So, a thrombin-like enzyme acts upon the fibrinogen molecule, transforming it into fibrin monomers that polymerize in the presence of calcium to form a stable clot with adhesive, hemostatic and sealant effects [8, 9].

Figure 1 shows the blood-clotting cascade in three different pathways, with human thrombin, bovine thrombin and serine protease extracted from Crotalus durissus terrificus venom [9]. Figure 2 shows a stable network of fibrin formed from a mixture of animal cryoprecipitate with serine protease extracted from snake venom, observed by electron microscopy [10].
Fig. 1

a The final common pathway of the human blood-clotting cascade. b The effect of bovine thrombin on human fibrinogen. c The effect of a serine protease (thrombin-like enzyme) extracted from snake venom on animal fibrinogen forming a stable fibrin polymer. Reprinted from “A new fibrin sealant from Crotalus durissus terrificus venom: applications in medicine” by LC Barros et al., J Toxicol Environ Health B Crit Rev, 2009, 12(8), 553–71 [9]. Copyright by Taylor & Francis LLC (http://www.tandfonline.com). Reprinted with permission

Fig. 2

Stable fibrin network visualized in an electron microscope (4,000×). Reprinted from “A new fibrin sealant as a three-dimensional scaffold candidate for mesenchymal stem cells” by VPO Gasparotto et al., Stem Cell Res Ther, 2014, 5(3), 78 [10]. Copyright by VPO Gasparotto et al. Reprinted with permission

Composition of the heterologous fibrin sealant

Fraction I: serine protease (gyroxin)

Molecular structure

The composition of the venom from Crotalus durissus terrificus snakes is complex and constituted of enzymes, toxins and peptides. Since the 1980s, several authors have studied, isolated and purified serine proteases including gyroxin, a thrombin-like enzyme extracted from the venom of Crotalus durissus terrificus [1115]. Electrophoretic analysis verified that this enzyme is a single-chain type, with an estimated molecular mass of 34 kDa and maximum stability at pH 8.0, and does not present alteration by freezing or thawing. Its maximum enzymatic activity occurs at pH 4.0, being resistant to treatment at 40 ° C for 15 min.

Theoretical molecular modeling of this serine protease extracted from Crotalus durissus terrificus venom was accomplished via the program Modeller and visualization of the model by the program PyMOL. In this manner, Fig. 3 shows the structural model, which was revealed as a monomeric globular structure, presenting two α-helix structures (red) containing the residues 146–152 and 215–227, two β-barris structures formed by six antiparallel sheets and loops (green), five disulfide bridges (blue) and a catalytic triad (orange) [16, 17].
Fig. 3

Theoretical molecular modeling of gyroxin accomplished using Modeller and PyMOL programs. This serine protease has two α-helix structures (red) containing the residues 146–152 and 215–227, two β-barris structures formed by six antiparallel sheets and loops (green), five disulfide bridges (blue) and a catalytic triad (orange)

Due to its enzymatic activity, similar to thrombin, the serine protease acts on human and animal fibrinogen, cleaving the α-chain proximal to the N-terminal. The resultant fibrin monomers were polymerized in an intense stable network (Fig. 2) in contrast to that traditionally produced by thrombin.

Isolation and structural elucidation

Venom from Crotalus durissus terrificus snakes (Fig. 4) was milked at CEVAP and pooled according to good manufacturing practices (GMP). All the snakes are microchipped to ensure the traceability of the venom lots used in the composition of heterologous fibrin sealant. After filtration and lyophilization, the venoms are stored in the Venoms Bank of CEVAP.
Fig. 4

Crotalus durissus terrificus snake

To isolate the serine protease (gyroxin), a low-pressure liquid chromatography system was employed, specifically the model Äkta Pilot® (GE HealthCare Life Science, Sweden) and the software Unicorn® 6.3 controlled the data acquisition. All reagents and salts utilized were of HPLC grade, and the Milli-Q water used was obtained in a Milipore® ultra-purifier (Fig. 5).
Fig. 5

Affinity liquid chromatography of Crotalus durissus terrificus crude venom with Benzamidine-Sepharose 6B resin (column AxiChrom 100/300® (100 mm × 300 mm × 350 mL). The column was equilibrated with 0.05 M Tris-HCl pH 7.4 (buffer 1). Sample: 15 g of crude venom was suspended in buffer 1. The sample elution was carried out with 525 mL of buffer 1 followed by 525 mL of 0.05 M Tris-HCl/0.5 M NaCl pH 7.4 (buffer 2) and 1,050 mL of 0.02 M glycine pH 3.2 (buffer 3), at flow rate 10 mL/min, and collected 25 mL/tube. Absorbance 280 nm

Fifteen grams of lyophilized venom from Crotalus durissus terrificus was suspended in 200 mL of the buffer 0.05 M Tris-HCl pH 7.4. This was applied in an AxiChrom 100/300® chromatographic column (100 mm x 300 mm x 350 mL) (GE HealthCare Life Science, Sweden) encased with affinity resin Benzamidine Sepharose 6B® (GE HealthCare Life Science, Sweden) previously equilibrated with 525 mL of 0.05 M Tris-HCl pH 7.4 buffer (buffer 1). The sample was eluted with 525 mL of 0.05 M Tris-HCl pH 7.4 (buffer 1), followed by 525 mL of 0.05 M Tris-HCl/0.5 M NaCl pH 7.4 (Buffer 2) and 1,050 mL of glycine 0.02 M pH 3.2 (buffer 3). The flow utilized was 10 mL/min and collected 25 mL/tube. The elution was monitored at an absorbance of 280 nm.

This purification process generates a single fraction whose purity is evaluated by N-terminal sequences (EDMAN) and mass spectrometry.

Figures 6 and 7 show, respectively, the comparison of N-terminal sequence of gyroxin with other thrombin-like snake toxins and their molecular mass by ESI mass spectrometry.
Fig. 6

Comparison between the N-terminal sequences by multiple alignment by MultiAlin program. The first sequence shows the serine protease purified in this study, followed by the sequences deposited in the NCBI such as: B2.1 (thrombin-like enzyme from Crotalus durissus terrificus venom); crotalase (thrombin-like enzyme from Crotalus adamanteus venom); gyroxin analog (thrombin-like enzye from Lachesis muta muta venom) and ancrod (thrombin-like enzyme from Agkistrodon rhodostoma). The red letters indicate high similarity (90%) and blue a low similarity level (50%). The black letters indicate no similarity

Fig. 7

LC-MS by ESI-ToF mass spectra (MicroQ-ToF III, Bruker Daltonics®). a Different protonated forms of gyroxin from Crotalus durissus terrificus. b Deconvoluted mass spectrum showing [M + H]+1 = 29.472 m/z. Molecular mass of this serine protease is 29.473 Da

Biological activity

In 2011, Barros et al. [9, 18] evaluated the coagulant activity of a serine protease isolated from Crotalus durissus terrificus venom, which was able to induce the formation of a fibrin network and consequently the formation of a stable clot at different concentrations.

Coagulant activity was studied at three different pH, namely: 4.0, 6.0 and 7.4. At each of them, the minimum coagulant dose (MCD) was verified and defined as the quantity at which a certain enzyme is capable of coagulating 200 μL of plasma in 60 s [15]. At pH 4.0, the MCD was 0.037 μg/μL of plasma, versus 0.015 μg/μL at pH 6.0 and 0.021 μg/μL at pH 7.4. Table 1 and Fig. 8 display the MCD at pH 7.4.
Table 1

Serine protease concentrations employed to evaluate the clotting time, the mean of three measures, the standard deviation and standard error of the mean for a 95% confidence interval at pH 7.4

Concentration (μg)

Mean (seconds)

Standard deviation

Standard error of the mean

3

84

±3.60

2.08

5

50.7

±0.57

0.33

10

32.7

±0.57

0.33

15

20

±0.0

0.0

20

14.7

±0.57

0.33

25

13.3

±0.57

0.33

Fig. 8

Coagulant activity: a fibrin clot formed after incubation of human plasma with serine protease; b detail of fibrin network

The serine protease coagulant activity at pH 7.4 was also confirmed through dose-dependent activity evaluated to obtain the MCD. For potential regression analysis, the MCD was determined at 0.021 μg/μL of human plasma, as shown in Fig. 9.
Fig. 9

Evaluation at pH 7.4 of the minimum coagulant dose (MCD) of the serine protease by potential regression analysis y = 220.13x-0,879, R 2 = 0.9899

It must be emphasized that the statistical analysis did not present a difference in the comparison of serine protease activity at pH 6.0 versus pH 7.4. These results lead to the conclusion that the best activity of the enzyme is found at between pH 6 and 7.4, values close to the optimum pH for blood-thrombin activity, which is 7.3 and varies in blood between 7.35 and 7.45 [18].

Fraction II: cryoprecipitate

Cryoprecipitate is the insoluble fraction, a cold precipitate of frozen fresh plasma (FFP) from Bubalus bubalis buffalos. It contains fibrinogen, factor VIII (F VIII), Willebrand factor (F vW), factor XIII (F XIII) and fibronectin [19, 20]. It must contain at least 80 units of factor VIII and between 150 and 250 mg of fibrinogen. Each unit has a volume from 10 to 20 mL, which must be stored at –20 ° C and has a shelf life of one year.

In 1995, Iuan et al. [5] proposed for the first time a new fibrin sealant constituted of a serine protease extracted from the venom of Crotalus durissus terrificus and human cryoprecipitate. The new product was compared with the commercial sealant in relation to the repair of sciatic nerves in Wistar rats. The anatomopathological analyses found similar results between the two products. Aiming at preventing infectious diseases transmitted by human blood, Thomazini-Santos et al. [21] in 1998 proposed for the first time to replace fibrinogen extracted from human blood with that from buffaloes. These same authors [21] evaluated the cryoprecipitate level of diverse animals and compared them with that extracted from human blood. They observed that buffaloes presented the highest fibrinogen levels, as shown in Table 2. Due to the good performance of the cryoprecipitate extracted from buffalos, these animals have been selected as the ideal donors.
Table 2

Comparison of fibrinogen concentration in mg% in human, bovine, equine, ovine and buffalo blood

Mean fibrinogen concentration in cryoprecipitate (mg%)

Human (N = 12) G1

Bovine (N = 9) G2

Equine (N = 10) G3

Ovine (N = 10) G4

Buffalo (N = 7) G5

375.50 ± 70.95

218.33 ± 9.76

240.80 ± 72.03

267.70 ± 25.42

664.00 ± 11.96

Statistics: G1 × G2 × G3 × G4 × G5, F = 120.26, p < 0.001, G5 > G1 > (G2 = G3 = G4)

In Brazil, the following four buffalo breeds are recognized by the Brazilian Association of Buffalo Breeders: mediterrâneo, murrah, jafarabadi (river buffalo) and carabao (swamp buffalo). The murrah breed, Bubalus bubalis, of Indian origin has been raised at the Lageado Experimental Farm, UNESP campus in Botucatu, for more than 30 years [22].

In order to ensure that this bioproduct contains no substance foreign to the human body, it is necessary to select and certify the donors. Therefore, sanitary management is mandatory for good economic results, which includes the following actions: annual vaccination against foot-and-mouth disease, brucellosis and rabies; systematic deworming; measures for hygiene and asepsis; practices of isolation and quarantine; protection of animals against vectors of transmissible diseases; diagnostic serological tests against brucellosis and leptospirosis; an annual hypersensitivity test against tuberculosis (tests of tuberculinization and of Mantoux or PPD); as well as frequent clinical exams performed by an experienced veterinary physician. These actions are recommended by the Department of Animal Health of the Secretariat for the Defense of Agribusiness and Livestock Raising in the Ministry of Agriculture, Livestock and Food Supply (MAPA) and by the World Health Organization, and are in continuous execution by the abovementioned team [2329].

Despite all these precautions, these animals can still pose a risk to human health due to transmission of spongiform encephalopathies (TSEs), also known as prion diseases, or as “mad cow” [29]. They are fatal neurodegenerative diseases that include scrapie in sheep, a bovine spongiform encephalopathy (BSE) and Creutzfeldt-Jakob disease (CJD) in humans. In buffalos, the transmission can occur through the consumption of previously infected tissue that is used in the feed manufacturing, particularly nerve tissue. In suspicious cases, the necropsy becomes the highest priority, followed by anatomical-pathological analysis. Researchers at CEVAP in partnership with the Center for Stable Environmental Isotopes, in the Botucatu Biosciences Institute of UNESP, developed a globally pioneering technique of isotopic tracers based on the dosing of carbon isotopes (13C) and nitrogen (15N) in sheep and buffaloes [30, 31]. After its standardization, this technique was tested in animals of the abovementioned herd, showing an absence of animal protein ingestion, which indirectly indicates that the buffalo donors of cryoprecipitate were potentially free of mad cow disease.

The growing concern with the rapid identification and resolution of sanitary problems in livestock has increased the interest in the study of biomarkers. Recent research has shown that the quantification of acute-phase proteins in blood can offer useful information for early diagnosis, prognosis and monitoring of diseases [32]. These proteins are considered not only potential indicators of inflammatory disease or contagious infections, but also an important tool in slaughterhouses to ensure food safety [33, 34].

The concentrations of these proteins, which remain circulating for long periods, depend on the severity of the dysfunction. Therefore, their quantification is an essential tool to evaluate the presence and severity of the inflammatory process, in contrast to the cytokines that remain circulating for short periods and whose measurement is onerous [35].

The first response of the organism to immunological stress is a non-specific release of cytokines that are mediators in the variation of acute-phase proteins [34, 35]. Through the influence of interleukins 1 and 6 (IL-1, IL-6) and of tumor necrosis factor (TNF-α), the hepatic cells augment or diminish the synthesis and the secretion of certain proteins. The response occurs immediately after a lesion or disease, declining within one or two days. The acute-phase proteins can be divided into two groups: negative and positive. The negative proteins are those that diminish the concentration when an acute-phase response occurs – and include albumin and transferrin, while the positive ones have their level elevated when there is an acute-phase response. In the latter case we have an increase in circulating C-reactive protein (CRP), glycoprotein-1 acid, antitrypsin-1, antichemotrypsin-1, serum amyloid A, ceruloplasmin, haptoglobin, macroglobin-2, fibrinogen and component C3 of the complement system [34, 36, 37].

For ruminants, haptoglobin has been described as the most important and reliable marker [32, 33]. Thus, the standardization of acute-phase biomarkers (fibrinogen and haptoglobin) and the clinical evaluation prior to blood donation permit the presumptive diagnosis of possible diseases and the removal of the donor animal to ensure the extraction of a safe bioproduct.

A rigorous protocol was applied in order to maintain biosecurity and the traceability of cryoprecipitate, as follows:
  • In the herd of buffalos:
    • ➢ microchipping permitting traceability a posteriori;

    • ➢ annual vaccination control against rabies, brucellosis and foot-and-month disease;

    • ➢ application and annual evaluation of the tuberculin;

    • ➢ control of spongiform encephalopathy (mad cow disease) by means of isotopic analysis;

    • ➢ nonspecific presumptive diagnosis of diseases for selection of ideal donors by means of haptoglobin and fibrinogen biomarkers.

  • In blood collection:
    • ➢ utilizing quadruple bag with filters in a line similar to those employed for humans;

    • ➢ transporting the bags with blood in refrigerated boxes to the processing laboratory;

    • ➢ applying techniques to evaluate fibrinogen levels and the factors V, VIII and von Willebrand;

    • ➢ preventing possible contaminations of the bags utilizing for quality control animal blood culture and of the bags in Bactec® for aerobic and anaerobic bacteria and Bactec Myco-F Lytic® for fungi.

Finally, analytical methods with singular characteristics, such as higher sensitivity, resolution and reproducibility were employed with a clinical proteomic approach [38]. Two-dimensional electrophoresis (2D) was used for isolating and identifying proteins by means of their molecular masses and isoelectric points in polyacrylamide gel, and electrospray-type mass spectrometry was used for sequencing peptides and proteins and identifying their biological function. Figure 10 shows the total protein profile of cryoprecipitate extracted from buffalos presenting the different forms of fibrinogen, evidenced for better visualization, since this protein is the main molecule responsible for stable fibrin clot formation. There are three observable classes of fibrinogen denominated: β-chain fibrinogen, from α and partial forms of α-chain fibrinogen, totaling 40 different forms of the molecule.
Fig. 10

Bubalus bubalis cryoprecipitate protein profile (2D-SDS-PAGE) showing 40 different forms of fibrinogen molecules

In sum, the cryoprecipitate extracted to be applied as a new heterologous fibrin sealant standardized by CEVAP is a product that is safe and free from undesirable substances. The formulation, as well as its storage, handling and dosage are described in detail in the internationally required patents (PCT/BR2015/000065 and PCT/BR2015/000064) [39].

The human use of heterologous fibrin sealant

The heterologous fibrin sealant, widely studied experimentally, is now in a phase I/II clinical trial for the treatment of chronic venous ulcers. Herein, we briefly describe the methodology utilized for manufacturing this new biomedicine that possesses vast potential to replace the human constituents utilized in commercial sealants currently available on the market. This product has undergone more than 20 years of development and due to its novelty and originality, it represents a success story in the context of World Toxinology, mostly in the southern hemisphere.

Until the present, two phase I/II clinical trials (called Sealant I and Sealant II) have been proposed for evaluating the treatment of chronic venous ulcers. For this purpose, four batches of sealant were produced for application in ten participants in the first project already concluded (Sealant I) and, in 30 participants in the second, which is now underway (Sealant II).

For the determination of the protein concentration of serine protease (gyroxin) utilized in the finished product, protein dosing was performed via direct reading at 280 nm utilizing a NanoView® spectrophotometer (GE Healthcare, USA). This apparatus quantifies the concentration of proteins according to the law of Lambert-Beer [40]. In this manner, the gyroxin quantity sufficient for polymerizing the fibrin contained in 1 mL of cryoprecipitate was defined for each 2 mL-dose of fibrin sealant. This quantity of polymer should cover an ulcer with a maximum size of 60 cm2. A 1 mL vial of cryoprecipitate contains, in addition to fibrinogen, the following coagulation factors: factor V, VIII and von Willebrand. The diluent vial contains 0.6 mL of a stable solution of calcium chloride. The details of this composition are described in the submitted patents [39].

Figures 11 and 12 demonstrate the product packaged for clinical research, with attention to the protocols of the National Health Surveillance Agency (ANVISA) in Brazil, as well as its preparation for application in ulcers of the participants (ethics approval CONEP-CAAE: 19006813.4.1001.5411).
Fig. 11

Packaging and vials approved only for clinical research use

Fig. 12

a Application of the product utilizing a double-outlet syringe with mixer at its end. b Polymerized product covering an ulcer

The objectives of the Sealant I project were already achieved, namely: to study safety and most appropriate dose of the new heterologous fibrin sealant for treating chronic venous ulcers.

Figures 13 and 14 show the evolution and ulcers healing in two participants, before (V0) and at the end of treatment.
Fig. 13

A 70 year-old female had an ulcer for two years. a Visit 0 – area of the ulcer was 17.1 cm2. b Visit 6 – wound healed

Fig. 14

The 50 year-old patient had an ulcer for 4 months. a Visit 0 – area of the ulcer was 0.3 cm2. b Visit 6 – wound healed

The new heterologous fibrin sealant is a safe and clinically promising candidate for treating chronic venous ulcers. A multicenter clinical trial, phase II/III, with a larger number of participants will be performed to prove the efficacy of the product [41]. A six-minute video is provided showing an overview of the production and application of the fibrin sealant (Additional file 1) (available at: https://youtu.be/y6ho6M0amA8).

Conclusions

The homologous commercial fibrin sealant has been used with success since the 1970s. Nowadays, its application has been consolidated in surgical procedures as an efficient method to avoid suturing, decrease recovery time and increase the success rate. Its indications are well defined and proven through a systematic review of studies and meta-analysis [4245]. Among the unsolved problems, especially in biopharmaceutical production, are the high costs and transmission of infectious diseases by human blood [3, 4]. The new heterologous fibrin sealant, composed primarily of extracted animal products, has low production costs and does not transmit infectious diseases. Standardized for over 20 years by a consortium of Brazilian researchers, several preclinical studies and clinical trials have already been completed. Thus, preclinical trials applying the product in the peripheral nervous and musculoskeletal systems [4656] and as a scaffold for stem cells have been studied extensively [5760]. Trials in plastic surgery skin repair [61], periodontal surgery [6264] and in chronic venous ulcers have also been performed [41, 65]. In addition to treating chronic venous ulcers, further clinical trials, especially ones linked to the nervous system and to skeletal muscle, will allow for a more precise use.

Abbreviations

2D: 

Two-dimensional electrophoresis

ANVISA: 

National Health Surveillance Agency

BSE: 

Bovine spongiform encephalopathy

CEVAP: 

Center for the Study of Venoms and Venomous Animals

CJD: 

Creutzfeldt-Jakob disease ()

CRP: 

C-reactive protein

FDA: 

U.S. Food and Drug Administration

FFP: 

Frozen fresh plasma

GMP: 

Good manufacturing practices

HFS: 

Heterologous fibrin sealant

IL-1: 

Interleukin 1

IL-6: 

Interleukin 6

MCD: 

Minimum coagulant dose

TNF: 

Tumor necrosis factor

TSEs: 

Transmission of spongiform encephalopathies

Declarations

Acknowledgments

The authors would like to thank Guilherme Shin Iwamoto Haga, Aristides Pavan, Carlos Antonio Caramori, Márcia Tonin Rigotto Carneiro and Natália Bronzato Medolago for their assistance in the present study. Thanks are also due to the Center for the Study of Venoms and Venomous Animals (CEVAP) of UNESP for enabling the publication of this paper (Edital Toxinologia CAPES no. 063/2010, process no. 230.38.006285/2011-21, AUXPE Toxinologia 1219/2011).

Funding

This study was supported by the São Paulo Research Foundation (FAPESP) (process no. 2009/53846-9 granted to BB and RSF Jr; process no. 2012/08101-8 granted to RSF Jr and process no. 2014/13299-7 granted to LDS), and to the National Council for Scientific and Technological Development (CNPq) (process no. 563582/2010-3 granted to BB). This work was also supported by the Coordination for the Improvement of Higher Education Personnel (CAPES) through Edital Toxinologia CAPES no. 063/2010, process no. 230.38.006285/2011-21, AUXPE Toxinologia 1219/2011 and by the Department of Science and Technology (DECIT) and the Secretariat of Science, Technology and Strategic Inputs (SCTIE), CNPq process n. 401170/2013-6, of the Brazilian Ministry of Health. RSF Jr is a CNPq DTI research fellow (310395/2014-3).

Authors’ contributions

RSF Jr., LCB, SRCSB, MRCS, LDS and LGP searched the databases (PubMed, Scopus, Scielo and Web of Science) and wrote the review. RSF Jr., LPFA and BB corrected the manuscript and prepared the images. All authors read and approved the final manuscript.

Competing interests

One of the authors of this article, Dr. Benedito Barraviera, is the Editor-in-Chief of Journal of Venomous Animals and Toxins including Tropical Diseases. He did not get involved in the peer review process of this manuscript.

Consent for publication

Written informed consent was obtained from the patients for publication of this study.

Ethics approval and consent to participate

Part of the research herein presented was approved by the Research Ethics Committee of the Botucatu Medical School (CEP protocol n. 501.232). Moreover, the clinical trials described in the section “The human use of heterologous fibrin sealant” were approved by the National Commission for Ethics on Research (CONEP) and received the Certificate of Presentation for Ethical Appreciation (CAAE) – 19006813.4.1001.5411.

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Authors’ Affiliations

(1)
Graduate Program in Tropical Diseases, Botucatu Medical School, São Paulo State University (UNESP – Univ Estadual Paulista)
(2)
Center for the Study of Venoms and Venomous Animals (CEVAP), São Paulo State University (UNESP – Univ Estadual Paulista)
(3)
Department of Dermatology and Radiology, Botucatu Medical School, São Paulo State University (UNESP – Univ Estadual Paulista)
(4)
CEVAP/UNESP

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