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Effects of tityustoxin on cerebral inflammatory response in young rats
Iva Tereza Van Fraga1, Marcelo Limborço-Filho1, Onésia Cristina Oliveira Lima1
1Núcleo de Neurociências (NNC), Departamento de Fisiologia e Biofísica, Instituto de Ciências Biológicas (ICB), Universidade Federal de Minas Gerais (UFMG), MG, Brazil.
Insights
Scorpion stings, particularly from Tityus serrulatus, can cause severe illness. This study shows tityustoxin (TsTX) triggers neuroinflammation by increasing leukocyte activity in the brain, even in young rats.
Area of Science:
- Neuroscience
- Immunology
- Toxicology
Background:
- Scorpion stings are a significant health concern, especially for children in tropical regions.
- Systemic inflammation is a known factor in scorpion envenoming.
- The neuroinflammatory effects of Tityus serrulatus venom's primary toxin, tityustoxin (TsTX), on the cerebral microcirculation are not well understood.
Purpose of the Study:
- To investigate whether tityustoxin (TsTX) induces inflammatory responses in the cerebral microcirculation.
- To systematically examine leukocyte recruitment into the central nervous system (CNS) following TsTX injection.
Main Methods:
- Developing rats received a subcutaneous injection of TsTX (0.75mg/kg).
- Leukocyte recruitment (rolling and adhesion) and TNF-α levels in the CNS were assessed at 4, 8, and 12 hours post-injection.
- Compared results against a control group.
Main Results:
- Rats injected with TsTX showed a significant increase in leukocyte rolling and adhesion in the CNS.
- Elevated levels of TNF-α were observed in TsTX-injected rats at all measured time points.
- These findings indicate a clear inflammatory response in the cerebral microcirculation.
Conclusions:
- Tityustoxin (TsTX) triggers neuroimmunological mechanisms.
- TsTX induces leukocyte recruitment and elevates TNF-α levels in the CNS of young rats.
- This study elucidates a key mechanism of neuroinflammation in TsTX envenoming.
Abstract:
Accidents caused by scorpion stings, mainly affecting children, are considered an important cause of morbidity and mortality in tropical countries. Clinical studies demonstrate the relevant role of systemic inflammatory events in scorpion envenoming. However, remains poorly understood whether the major lethal component in Tityus serrulatus venom, tityustoxin (TsTX), is able to induce inflammatory responses in the cerebral microcirculation. In this study, we systematically examined leukocyte recruitment into the CNS in response to TsTX injection. Accordingly, developing rats were subjected to a subcutaneous (s.c.) injection of TsTX (0.75mg/kg), and leukocyte recruitment (i.e., 4, 8 and 12h after injection) and TNF-α levels were evaluated. Rats injected with TsTX presented a significant increase in leukocyte rolling and adhesion and higher levels of TNF-α at all time points studied, compared to the control group. Altogether, this work demonstrates the triggering of neuroimmunological mechanisms induced by TsTX injection in young rats.
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