Journal
ACS MEDICINAL CHEMISTRY LETTERS
Volume 11, Issue 11, Pages 2204-2211Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsmedchemlett.0c00340
Keywords
GABA(A) receptor; Cys-loop; positive allosteric modulator; ion channel; pyrroloindoline
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Funding
- NIH [R35GM118191-01]
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gamma-Aminobutyric acid type A (GABA(A)) receptors are key mediators of central inhibitory neurotransmission and have been implicated in several disorders of the central nervous system. Some positive allosteric modulators (PAMs) of this receptor provide great therapeutic benefits to patients. However, adverse effects remain a challenge. Selective targeting of GABA(A) receptors could mitigate this problem. Here, we describe the synthesis and functional evaluation of a novel series of pyrroloindolines that display significant modulation of the GABA(A) receptor, acting as PAMs. We found that halogen incorporation at the CS position greatly increased the PAM potency relative to the parent ligand, while substitutions at other positions generally decreased potency. Mutagenesis studies suggest that the binding site lies at the top of the transmembrane domain.
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