GS 283

• CAT Number: M098987
• CAS Number: 149440-36-8
• Molecular Formula: C17H17NO3
• Molecular Weight: 283.327
• Purity: ≥95%
• Synonyms: GS 283
• Target: Ca(2+) antagonist
• Storage: -20°C
• IUPAC Name: 7-hydroxy-1-[(4-methoxyphenyl)methyl]-3,4-dihydro-2H-isoquinolin-6-one
• InChI: InChI=1S/C17H17NO3/c1-21-13-4-2-11(3-5-13)8-15-14-10-17(20)16(19)9-12(14)6-7-18-15/h2-5,9-10,18,20H,6-8H2,1H3
• InChIKey: MNKDRWPSFCHJHJ-UHFFFAOYSA-N
• SMILES: COC1=CC=C(C=C1)CC2=C3C=C(C(=O)C=C3CCN2)O

GS 283 is a Ca(2+) antagonist and a weak histamine & muscarinic receptor blocker in rat & guinea pig tracheal smooth muscles. Its mode of action is inhibition of calcium influx from plasma membrane & also release from sarcoplasmic reticulum.

Reference

1:Eur J Pharmacol. 1993 May 12;236(1):51-60. Pharmacological characterization of effects of verapamil and GS 283 on isolated guinea pig and rat trachealis.Chang KC,Ko HJ,Cho SD,Yoon YJ,Kim JH, PMID: 8100527 Abstract: The pharmacological effects of verapamil and GS 283, 1-(4/’-methoxybenzyl)-6,7-dihydroxy-3,4-dihydroxyisoquinoline, were investigated using isolated rat and guinea pig trachealis. Both verapamil and GS 283 inhibited carbachol-, histamine (only guinea pig)-, and high-K(+)-induced contraction in a dose-dependent manner. GS 283 acted as a weak histamine H1 and muscarinic receptor antagonist in guinea pig and rat trachealis with respective pKB values in the range of 5.60 approximately 6.12 and 5.17 approximately 5.83. On the other hand, pyrilamine and atropine showed a typical competitive antagonism on histamine (guinea pig) and on muscarinic receptors (rat trachea) with pKB values of 9.25 +/- 0.21 and 9.37 +/- 0.32, respectively. GS 283 inhibited Ca(2+)-induced contraction on guinea pig trachealis in Ca(2+)-free media. Furthermore, very high concentrations of GS 283 and verapamil completely abolished a phasic contraction induced by carbachol in Ca(2+)-free media, suggesting that verapamil and GS 283 can enter into the cytoplasm, where they may exert secondary actions on internal sites of the muscle, such as the sarcoplasmic reticulum. It is concluded that GS 283 has a Ca2+ antagonistic action along with weak histamine and muscarinic receptor blocking activity in isolated rat and guinea pig tracheal smooth muscle and its mode of action is likely inhibition of Ca2+ influx from plasma membrane and also release from the sarcoplasmic reticulum.