Editorial: Novel Immunotherapies Against Envenomings by Snakes and Other Venomous Animals

Globally, several million people fall victim to animal envenomings each year. These envenomings are caused by snakes, scorpions, spiders, bees, and other venomous animals (Pucca et al.), which are able to inflict bites and stings, which inject venoms, mixtures of protein-based toxins, into their victims and prey. Since the late eighteenth century, the first-choice treatment for severe animal envenomings has been antivenoms, which consist of polyclonal antibodies or antibody fragments isolated from the serum or plasma of animals hyper-immunized with venoms. These essential medicines are invaluable in saving the lives and limbs of patients worldwide. However, these “conventional” antivenoms are burdened with a number of disadvantages, such as a high content of non-neutralizing antibodies, a propensity to induce adverse reactions (including serum sickness and anaphylaxis), and a relatively high cost of manufacture compared to many other routinely used therapeutics (1). In recent decades, many new biotechnologies have emerged, which have been successfully employed to develop breakthrough therapies within oncology, autoimmunity, and infectious diseases. These biotechnologies present an opportunity for the field of envenoming therapy, and antivenom researchers have therefore started to apply these new approaches with the goal of increasing the efficacy of plasma-derived antivenoms through innovative immunization approaches (2), or by utilizing recombinant DNA technology and antibody discovery methodologies to generate recombinant antivenoms with improved efficacy and safety profiles.

This Research Topic presents two reviews and two original research articles that exhibit prominent and recent examples of the developments within novel immunotherapies against envenomings by snakes and other venomous animals. In Pucca et al., the history of envenoming therapies is reviewed with a focus on the key developments in the life sciences that led to the generation of the first antivenoms, as well as their subsequent refinement and optimization. It underscores the impact of basic immunological research within the field, as well as the contributions generated within antivenom research, which led to the development of immunological methods and novel therapeutics based on monoclonal antibodies that are now utilized across almost all fields of medicine. This review further provides perspectives on the advances in biotechnology in the last decades, which have influenced the academic research agenda in antivenom research, and discusses how different scientific breakthroughs in synthetic biology, antibody technologies, immunology, and molecular biology, such as phage display technology, may be exploited in the development of improved, next-generation envenoming therapies.

In de Castro et al., an example is provided of how knowledge of venom biology and new immunization approaches can be harnessed in the development of improved serotherapies against envenomings by Micrurus spp. (coral snakes). Here, a combined immunization protocol, using priming doses of M. frontalis venom and booster doses of synthetic B-cell epitopes derived from M. corallinus three-finger toxins and phospholipases A₂, elicited a humoral response against both venoms in a rabbit model. The raised sera displayed relevant cross-reactivity against venoms from other Micrurus species (M. altirostris, M. lemniscatus, M. spixii, and M. surinamensis) and were demonstrated to be able to neutralize PLA₂ activity of M. frontalis and M. corallinus venoms. In vivo, the sera completely protected mice from a challenge with 1.5 median lethal dose (LD₅₀) of M. corallinus venom and protected 50% of mice challenged with 1.5 LD₅₀ of M. frontalis venom.

Bailon-Calderon et al. describe a promising example of the utilization of antibody technologies. In their work, a set of nanobodies was developed from a library of a Lama glama immunized with the venom of Bothrops atrox, a viperid of utmost medical relevance in South America. Several of the obtained recombinant nanobodies showed neutralizing ability toward hemorrhagic and myotoxic venom components, which are responsible for major local tissue damage. The study further highlights the valuable potential of these innovative biotherapeutics, bringing them one step closer to clinical application.

Finally, Pucca et al. provide a comprehensive overview of the scientific literature surrounding bee venom toxinology and the treatment against bee stings. Here, the epidemiology of Apis spp. (bees) is presented with a special focus on the species Apis mellifera (Africanized bee), which is a hybrid species of the African and European honey bees that cause a significant number of severe envenomings, some of which have resulted in human fatalities. Further, all proteinaceous components of bee venom are presented with a discussion on the two main toxic components, phospholipase A₂ and melittin, and their synergistic toxic function in victims. The review concludes with a detailing of how bee stings are currently only treated symptomatically, and that opportunities exist for developing recombinant antivenoms against bee envenomings.

The field of next-generation antivenoms has recently gained increased interest, and technological advancements now enable researchers to undertake the ambitious endeavor of developing improved therapeutic interventions against animal envenomings. This trend will likely continue for the years to come, as such efforts are officially supported by the recently published strategy from the World Health Organization (3). Next-generation antivenom research is still a rather nascent field. However, within the next two decades, it is predicted that this area of research will experience significant development and innovation.

Statements

Summary

Keywords

venom, envenoming, antivenom, recombinant antivenom, toxin-neutralization, immunotherapy, antibody discovery, serotherapy

Citation

Laustsen AH, Ainsworth S, Lomonte B, Kini RM and Chávez-Olórtegui C (2020) Editorial: Novel Immunotherapies Against Envenomings by Snakes and Other Venomous Animals. Front. Immunol. 11:1004. doi: 10.3389/fimmu.2020.01004

Received

15 April 2020

Accepted

28 April 2020

Published

22 May 2020

Volume

11 - 2020

Edited and reviewed by

Denise Doolan, James Cook University, Australia

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Copyright

© 2020 Laustsen, Ainsworth, Lomonte, Kini and Chávez-Olórtegui.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Andreas Hougaard Laustsen ahola@bio.dtu.dkStuart Ainsworth stuart.ainsworth@lstmed.ac.ukBruno Lomonte bruno.lomonte@ucr.ac.crR. Manjunatha Kini dbskinim@nus.edu.sgCarlos Chávez-Olórtegui olortegi@icb.ufmg.br

This article was submitted to Vaccines and Molecular Therapeutics, a section of the journal Frontiers in Immunology

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