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Updated: Apr 30, 2026
Functional Evaluation of Biological Neurotoxins in Networked Cultures of Stem Cell-derived Central Nervous System Neurons
Published on: February 5, 2015
A proteomic analysis of the early secondary molecular effects caused by Cn2 scorpion toxin on neuroblastoma cells
Martha Pedraza Escalona1, Cesar V F Batista2, Rita Restano Cassulini1
1Departmento de Medicina Molecular y Bioprocesos, Instituto de Biotecnologia, Universidad Nacional Autonoma de Mexico, Avenida Universidad Nacional Autonoma de Mexico, Avenida Universidad, 2001, Colonia Chamilpa, Apartado Postal 510-3, Cuernavaca 62210, Mexico.
Abstract:
Although the primary physiological effects produced by scorpion toxins are already well known, most of the secondary molecular events following scorpion neurotoxins-ion channel interactions are poorly understood and described. For this reason, we used a proteomic approach to determine the changes in relative protein abundance in F11 mouse neuroblastoma cells treated with Cn2, the major β-toxin from the venom of the scorpion Centruroides noxius Hoffmann. Here we show that the relative abundance of 24 proteins changed after Cn2 treatment. Proteins related to protection from apoptosis and cell survival, as well as those involved in cell morphology and some translation elongation factors were diminished. By contrast, proteins associated with energy metabolism were increased. Additionally, results of western immunoblots confirmed the preference of action towards some special targets. These results suggest that Cn2 could modify the neuronal structure and induce apoptosis and reduction of the proliferation and cell survival. To support this conclusion we directly measured the Cn2 effect on cell proliferation, division and apoptosis. Our results open new avenues for continuing the studies aimed at better understanding the envenomation process caused by scorpion stings.
Biological Significance:
The purpose of this work was to identify which proteins, apart from the ion-channels, are involved in the envenomation process in order to develop possible strategies to circumvent the deleterious effects caused by the toxic peptides of the venom. For this reason, we characterized the early changes in the proteome of F11 cells induced by Cn2, the major toxin of the New World scorpion C. noxius Hoffmann, using 2D-PAGE and LC-MS/MS. We identified 24 proteins which relative abundance is modified after the Cn2 treatment. Among these, proteins related with apoptosis protection, cell survival, neuronal morphology and some translation elongation factors were diminished, whereas proteins associated with energy metabolism were increased.
Insights
Scorpion toxin Cn2 alters protein levels in neuroblastoma cells, affecting apoptosis, cell survival, and energy metabolism. This study reveals secondary molecular events in scorpion envenomation, aiding in understanding and potential treatment development.
Area of Science:
- Neuroscience
- Toxicology
- Proteomics
Background:
- The secondary molecular events following scorpion neurotoxin-ion channel interactions are not well understood.
- Scorpion stings can cause severe health issues, necessitating a deeper understanding of venom's effects.
Purpose of the Study:
- To investigate the proteomic changes in F11 mouse neuroblastoma cells treated with Cn2, a major beta-toxin from Centruroides noxius scorpion venom.
- To identify secondary molecular targets and pathways affected by scorpion toxins beyond ion channels.
Main Methods:
- Proteomic analysis using 2D-PAGE and LC-MS/MS to identify changes in protein abundance.
- Western immunoblotting to confirm specific protein target interactions.
- Direct measurement of cell proliferation, division, and apoptosis.
Main Results:
- Treatment with Cn2 resulted in altered relative abundance of 24 proteins in F11 cells.
- Proteins involved in apoptosis protection, cell survival, and neuronal morphology were decreased.
- Proteins associated with energy metabolism were increased, suggesting a metabolic shift.
Conclusions:
- Cn2 toxin modifies neuronal structure, potentially inducing apoptosis and reducing cell proliferation and survival.
- These findings provide insights into the complex molecular mechanisms of scorpion envenomation.
- Understanding these secondary effects can inform the development of strategies to counteract venom's deleterious impacts.
