Preclinical assessment of a polyspecific antivenom against the venoms of Cerrophidion sasai, Porthidium nasutum and Porthidium ophryomegas: Insights from combined antivenomics and neutralization assays.

This research study explores the effectiveness of a specific antivenom used in Central America, made from the venoms of three different viperid snakes, in neutralizing the toxic effects of snakebite venom from three other viperid species. The study demonstrates the antivenom’s capacity to neutralize lethal, hemorrhagic, myotoxic and other venom activities, highlighting the need for further research to improve the immune response against venom components that show weak immunogenicity.

Objective of the Research

• The goal of this study was to assess the effectiveness of a polyspecific antivenom, used in Central America, against the venoms of three viperid snake species – Porthidium nasutum, Porthidium ophryomegas, and Cerrophidion sasai.
• The antivenom is generated from horses hyperimmunized with a mix of venom from other snake species: Bothrops asper, Crotalus simus, and Lachesis stenophrys.

Research Methods

• The researchers implemented immunoaffinity antivenomics to assess the immunorecognition of the components of these venoms.
• The study also evaluated the antivenom’s effectiveness in neutralizing various venom activities, such as lethal, hemorrhagic, myotoxic, phospholipase A(2) (PLA(2)), and proteinase.

Findings of the Research

• The research concluded that the antivenom was effective in neutralizing the lethal, hemorrhagic, myotoxic and other venom activities of the three unique snake venoms under examination.
• Antivenom IgGs showed more immunocapturing activity of toxins from both Porthidium taxa compared to Cerrophidion sasai.
• However, certain venom components showed low immunogenicity, which were not as effectively recognized by the antivenom.

Implications of the Research

• The study emphasized the importance of pursuing innovative approaches to enhance horses’ immune responses against several venom components that show weak immunogenicity.
• Despite the noted limitations, the results indicate a measure of paraspecific protection of the Costa Rican polyspecific antivenom against the three types of snake venom under investigation.