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Pregnanolone-Based Prodrugs as a Strategy for Neuroprotective Drug-Like Compounds: Pregnanolone Pyroglutamate and Its
Pavel Mareš1, Hana Chodounská2, Ewa Szczurowska2
1Institute of Physiology, Academy of Sciences of the Czech Republic, Prague, Czech Republic.
Insights
A novel pregnanolone prodrug strategy effectively delivered pregnanolone in vivo, showing significant, age-dependent reductions in pediatric epilepsy seizures. Compound 1 demonstrated robust anticonvulsant efficacy, offering a promising new avenue for treating pharmacoresistant seizures in children.
Area of Science:
- Neuroscience
- Pharmacology
- Medicinal Chemistry
Background:
- Pediatric epilepsy presents significant therapeutic challenges due to drug resistance and the unique physiology of immature brains.
- Existing treatments often lack efficacy or are not optimized for developing neurological systems.
- Neurosteroids like pregnanolone show anticonvulsant potential but face challenges with delivery and stability.
Purpose of the Study:
- To develop and evaluate a pregnanolone-based prodrug strategy for enhanced anticonvulsant efficacy in pediatric epilepsy.
- To mask the C-3 hydroxyl group of pregnanolone to improve in vivo regeneration and preserve/enhance its seizure-controlling properties.
- To identify lead compounds for treating pharmacoresistant seizures in the developing brain.
Main Methods:
- Synthesized four C-3 conjugated pregnanolone analogues (compounds 1-4) as positive modulators of gamma-aminobutyric acid type A receptors (GABAARs).
- Evaluated in vivo anticonvulsant activity using the 6-Hz transcorneal stimulation model in 15- and 25-day-old Wistar rats.
- Quantified seizure duration and severity, comparing results to allopregnanolone and zuranolone.
Main Results:
- All synthesized prodrugs exhibited nanomolar GABAAR modulation in vitro.
- Compound 1 (pregnanolone pyroglutamate) demonstrated the most consistent and robust in vivo efficacy, significantly reducing seizure duration and severity in an age-dependent manner.
- Compounds 2 and 4 showed enhanced efficacy in younger rats, and plasma stability studies confirmed rapid biotransformation of compound 1 to pregnanolone in vivo.
Conclusions:
- The pregnanolone prodrug approach, utilizing C-3 masking for in vivo release, is validated as an effective strategy for anticonvulsant development.
- Compound 1 is identified as a promising lead candidate for further development as an anticonvulsant therapy for pediatric epilepsy.
- This research provides a framework for creating neurosteroid prodrugs with improved properties for treating pharmacoresistant seizures in developing brains.
Purpose:
Pediatric epilepsy remains a major therapeutic challenge due to the high prevalence of pharmacoresistant seizures, and the lack of drugs tailored to immature brain physiology. This study tested a pregnanolone‑based prodrug strategy in which the metabolically labile C‑3 hydroxyl group is transiently masked with a polar moiety designed to regenerate pregnanolone in vivo and thereby preserve or enhance its anticonvulsant efficacy.
Methods:
Four C‑3‑conjugated pregnanolone analogues (compounds 1-4) were synthesized and characterized as positive modulators of γ‑aminobutyric acid type A receptors (GABAARs) in vitro. Their in vivo activity was evaluated in the 6-Hz transcorneal stimulation model in 15‑ and 25‑day‑old Wistar rats, with detailed quantification of seizure duration and severity, and direct comparison to the endogenous neurosteroid allopregnanolone and the approved neuroactive steroid zuranolone.
Results:
All four prodrugs showed nanomolar GABAA receptor modulation, consistent with the expected main neurosteroid mechanism of action. Compound 1 (pregnanolone pyroglutamate), designed to be enzymatically cleaved to release pregnanolone, displayed the most consistent and robust in vivo efficacy, producing marked, age‑dependent reductions in seizure duration and severity across multiple parameters in both age groups. Additionally, compounds 2 and 4 displayed enhanced efficacy in younger animals. Plasma stability experiments demonstrated rapid biotransformation of compound 1 to pregnanolone, supporting the hypothesis that its anticonvulsant effect is mediated by in vivo regeneration of the parent neurosteroid.
Conclusion:
These findings validate a pregnanolone‑prodrug approach in which C‑3 masking groups are used primarily to deliver and release endogenous pregnanolone in vivo, and they identify compound 1 as a lead candidate for further optimization as an anticonvulsant for pediatric epilepsy. The work provides a translationally relevant framework for developing neurosteroid‑based prodrugs with improved drug‑like properties for pharmacoresistant seizures in the developing brain.
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