Design, Synthesis, and Biological Evaluation of Novel Tetrahydroprotoberberine Derivatives (THPBs) as Selective α 1A-Adrenoceptor Antagonists

J Med Chem. 2016 Oct 27;59(20):9489-9502. doi: 10.1021/acs.jmedchem.6b01217. Epub 2016 Oct 12.

Abstract

A novel series of tetrahydroprotoberberine derivatives (THPBs) were designed, synthesized, and evaluated as selective α1A-adrenergic receptors (AR) antagonists for the treatment of benign prostatic hyperplasia. On the basis of the pharmacophore model of the marketed drug silodosin, THPBs were modified by introducing an indole segment into their core scaffolds. In calcium assays, 7 out of 32 compounds displayed excellent antagonistic activities against α1A-ARs, with IC50 less than 250 nM. Among them, compound (S)-27 had the most potent biological activity; its IC50 toward α1A-AR was 12.8 ± 2.2 nM, which is 781 and 20 times more selective than that toward α1B- and α1D-AR, respectively. In the functional assay using isolated rat tissues, compound (S)-27 inhibited norepinephrine-induced urethra smooth muscle contraction potently (IC50 = 0.5 ± 0.3 nM), without inhibiting the aortic contraction (IC50 > 1000 nM), displaying a better tissue selectivity than the marketed drug silodosin. Additional results of preliminary safety studies (acute toxicity and hERG inhibition) and pharmacokinetics studies indicated the potential druggability for compound (S)-27 which is a promising lead for the development of selective α1A-AR antagonists for the treatment of BPH.

MeSH terms

  • Adrenergic alpha-1 Receptor Antagonists / administration & dosage
  • Adrenergic alpha-1 Receptor Antagonists / chemical synthesis*
  • Adrenergic alpha-1 Receptor Antagonists / chemistry
  • Adrenergic alpha-1 Receptor Antagonists / pharmacology*
  • Animals
  • Berberine Alkaloids / administration & dosage
  • Berberine Alkaloids / chemical synthesis
  • Berberine Alkaloids / chemistry*
  • Berberine Alkaloids / pharmacology*
  • Dose-Response Relationship, Drug
  • Drug Design*
  • Ether-A-Go-Go Potassium Channels / antagonists & inhibitors
  • Ether-A-Go-Go Potassium Channels / metabolism
  • HEK293 Cells
  • Humans
  • Male
  • Mice
  • Mice, Inbred Strains
  • Molecular Structure
  • Rats
  • Rats, Sprague-Dawley
  • Receptors, Adrenergic, alpha-1 / metabolism*
  • Structure-Activity Relationship
  • Tumor Cells, Cultured

Substances

  • Adrenergic alpha-1 Receptor Antagonists
  • Berberine Alkaloids
  • Ether-A-Go-Go Potassium Channels
  • Receptors, Adrenergic, alpha-1
  • berbine