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Antiepileptic Drugs: GABAergic Pathway Potentiators01:18

Antiepileptic Drugs: GABAergic Pathway Potentiators

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γ-aminobutyric acid or GABA, plays a pivotal role as an inhibitory neurotransmitter in the brain. GABA pathway potentiators, also known as GABAergic drugs, are a class of pharmaceutical agents designed to enhance the functioning of the GABAergic system. These medications primarily treat epilepsy, a neurological disorder characterized by recurrent seizures.
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Polymorphism refers to the existence of a drug substance in multiple crystalline forms, known as polymorphs. Recently, this term has been expanded to include solvates (forms containing a solvent), amorphous forms (non-crystalline forms), and desolvated solvates (forms from which the solvent has been removed).
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Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
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Glutamate is a fundamental neurotransmitter in the central nervous system, playing a vital role in neuronal communication and various cognitive processes. Glutamate stands as the principal excitatory neurotransmitter in the brain. Its presence is crucial for the communication between neurons, underpinning essential processes such as synaptic transmission, neuronal excitability, and plasticity. These functions are vital for higher-order cognitive processes, including learning and memory. The...
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Ezocgabine or retigabine, an antiepileptic drug of remarkable efficacy, has revolutionized the management of seizures. It is a potassium channel activator, explicitly targeting the family of Q subtype potassium channels. It enhances the transmembrane potassium currents, regulating neuronal excitability. This action stabilizes the resting membrane potential, a pivotal factor in mitigating the hyperexcitability that characterizes epilepsy.
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Polymorphism and Multi-Component Crystal Formation of GABA and Gabapentin.

Daniel Komisarek1, Fulya Demirbas1, Takin Haj Hassani Sohi1

  • 1Laboratory for Crystal Engineering, Department of Inorganic and Structural Chemistry 1, Heinrich-Heine-University Dueseldorf, Universitaetsstraße 1, 40225 Duesseldorf, Germany.

Pharmaceutics
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Summary

This study examines crystal forms and multi-component compounds of gamma-amino butanoic acid (GABA) and gabapentin. It reveals how intermolecular forces and crystallization conditions influence phase formation, guiding future drug development.

Keywords:
APIGABAcrystallizationgabapentinhydrogen bondmulticomponent crystalsnon-covalent interactionspharmaceutical crystal engineeringpolymorphism

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Area of Science:

  • Solid-state chemistry
  • Crystallography
  • Pharmaceutical science

Background:

  • Polymorphism and multi-component crystal formation of gamma-amino butanoic acid (GABA) and gabapentin are not fully understood.
  • GABA and gabapentin exhibit distinct phase behaviors, with specific polymorphs requiring special conditions or being prone to hydration.

Purpose of the Study:

  • To structurally revisit known polymorphs of GABA and gabapentin, including gabapentin monohydrate.
  • To clarify the accessibility and phase stability of different crystalline forms.
  • To investigate the role of intermolecular interactions, molecular conformations, and crystallization environment in dictating phase formation.

Main Methods:

  • Structural analysis of existing polymorphs and gabapentin monohydrate.
  • Computational methods including lattice energy calculations, Atoms-in-Molecules (AIM) model, and Non-Covalent Interaction (NCI) plots.
  • Synthesis and structural/computational analysis of six novel multi-component entities (salts and co-crystals) of GABA and gabapentin with fumaric and succinic acids.

Main Results:

  • Lattice energy differences indicate similar stability between polymorphs.
  • AIM and NCI analyses show comparable hydrogen bond strengths across polymorphs.
  • Intermolecular interaction modes, combined with repulsion, dictate phase formation under varying crystallization conditions.
  • Carboxyl/carboxylate interactions strongly direct the formation of multi-component phases, overriding other factors.

Conclusions:

  • Crystallization behavior of zwitterionic GABA derivatives is governed by a complex interplay of intermolecular forces and environmental factors.
  • Hydrogen bonds are key motif-directing forces in solid-phase GABA analogs.
  • Understanding these commonalities is crucial for the rational design of future related pharmaceutical products.