AaTs-1, a Tetrapeptide from Scorpion Venom Mitigates Demyelination and Neuroinflammation in a Cuprizone-Induced Model of Multiple Sclerosis

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  AaTs-1, a Tetrapeptide from Scorpion Venom Mitigates Demyelination and Neuroinflammation in a Cuprizone-Induced Model of Multiple Sclerosis Abstract Purpose This study focuses on the evaluation of the therapeutic potential of Tetrascorpin-1 (AaTs-1), a tetrapeptide isolated from Androctonus australis hector venom, proposed as a putative formyl peptide receptor 2 (FPR2) antagonist, in a cuprizone-induced murine model of Multiple sclerosis (MS), a chronic autoimmune and inflammatory disease of the central nervous system. Methods Acute demyelination was induced in mice by administering cuprizone (0.2% w/w in the diet) for six weeks. During the sixth week of cuprizone intake, demyelinated mice received intranasal administration of AaTs-1 at a dose of 50–100 µg/kg for five consecutive days, with 24-hour intervals between treatments. Results Behavioral assessments, immunological assays, and histological analyses revealed that AaTs-1 improved body weight, reduced behavioral impairments...

Exploring the antiangiogenic effects of Phospholipases A2 from Bothrops diporus venom

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Exploring the antiangiogenic effects of Phospholipases A2 from Bothrops diporus venom

Abstract

Angiogenesis, the formation of new blood vessels from pre-existing vasculature, is a crucial process in both physiological and pathological contexts, including cancer. Phospholipases A2 (PLA2s), enzymes found in snake venoms, have attracted attention due to their potential antiangiogenic properties. In this study, we explored the antiangiogenic effects of PLA2 isoforms isolated from Bothrops diporus venom using a combination of in vivo and ex vivo models. The chorioallantoic membrane (CAM) assay revealed a significant reduction in vascular density and branching following PLA2s treatment, with histological analysis confirming vascular regression, including vessel wall thinning and luminal collapse. Moreover, PLA2s induced endothelial cell apoptosis, as shown by TUNEL staining, and reduced VEGF expression. The filter paper disc variant of the CAM assay further supported these findings, demonstrating inhibited neovascularization while preserving mature vessels. Additionally, the CAM explant assay showed a marked decrease in vascular complexity and branching. These results demonstrate the antiangiogenic effect of PLA2 isoforms from B. diporus and suggest that these enzymes may modulate key angiogenic pathways. Based on our previous findings, this modulation may involve interference with integrin-mediated signaling, which could underlie the vascular effects observed. Thus, this work provides compelling evidence for the potential role of snake venom-derived PLA2s in modulating angiogenesis and highlights the need for further research into their mechanisms and possible biomedical applications.

Sasovsky, D.J., Olea, G.B., Ojeda, G. et al. Exploring the antiangiogenic effects of Phospholipases A2 from Bothrops diporus venom. Cell Tissue Res (2025). https://doi.org/10.1007/s00441-025-04008-7