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A mouse mutant strain highly resistant to methyl beta-carboline-3-carboxylate-induced seizures
Y Clément1, J M Launay, D Bondoux
1U.R.A C.N.R.S. 1294, U.F.R Biomédicale, Université Paris V, France.
Abstract:
The convulsant properties of methyl beta-carboline-3-carboxylate (beta-CCM) were evaluated in the TaT-fm/GncTa+/+Tfm strain carrying the tabby coat color (Ta) and/or the testicular feminization (Tfm) gene. When injected intraperitoneally within a 5-60 mg/kg dose range, beta-CCM-induced convulsions in less than 25% of the mice, thus providing evidence for a high resistance of this strain, as compared to classical strains of mice. However, this strain responds normally to the convulsant pentylenetetrazol (PTZ), suggesting a specific resistance to beta-CCM. Both the Ta gene and the TaTfm/Gnc genetic background were involved in the high resistance to beta-CCM. In addition, concentrations of neurosteroids and benzodiazepine binding, both modulating GABAA receptor efficacy, have been measured in order to elucidate the biological mechanisms of drug resistance.
Insights
This study found a specific resistance to methyl beta-carboline-3-carboxylate (beta-CCM) in a mouse strain with tabby (Ta) and/or testicular feminization (Tfm) genes. This resistance, linked to the Ta gene and genetic background, suggests unique biological mechanisms.
Area of Science:
- Neuropharmacology
- Genetics
- Toxicology
Background:
- Methyl beta-carboline-3-carboxylate (beta-CCM) is known for its convulsant properties.
- Understanding genetic influences on drug response is crucial for personalized medicine.
Purpose of the Study:
- To evaluate the convulsant effects of beta-CCM in a specific mouse strain (TaT-fm/GncTa+/+Tfm).
- To investigate the genetic basis and biological mechanisms underlying resistance to beta-CCM.
Main Methods:
- Intraperitoneal injection of beta-CCM in the specified mouse strain across a dose range (5-60 mg/kg).
- Administration of pentylenetetrazol (PTZ) as a control to assess specific resistance.
- Measurement of neurosteroid concentrations and benzodiazepine binding.
Main Results:
- The TaT-fm/GncTa+/+Tfm strain exhibited high resistance to beta-CCM-induced convulsions (less than 25% response).
- The strain showed normal sensitivity to PTZ, indicating specific resistance to beta-CCM.
- Both the tabby (Ta) gene and the TaTfm/Gnc genetic background contributed to this resistance.
Conclusions:
- The TaT-fm/GncTa+/+Tfm mouse strain displays significant and specific resistance to beta-CCM.
- Genetic factors, specifically the Ta gene and the overall genetic background, play a role in this resistance.
- Further investigation into neurosteroids and GABAA receptor modulation is needed to elucidate the resistance mechanisms.