Activation of the sheep cardiac Ca2+ release channel by simple heteroaromatics

• Published in: Biochemical and biophysical research communications 2004-04, Vol.317 (2), p.397-400
• Main Authors: Bannister, Mark L, Williams, Alan J
• Format: Article
• Language: English
• Subjects: Animals; Cell Membrane - drug effects; Cell Membrane - metabolism; Cells, Cultured; Dose-Response Relationship, Drug; Hydrocarbons, Aromatic - pharmacology; Ion Channel Gating - drug effects; Ion Channel Gating - physiology; Myocytes, Cardiac - drug effects; Myocytes, Cardiac - metabolism; Protein Binding - drug effects; Ryanodine Receptor Calcium Release Channel - drug effects; Ryanodine Receptor Calcium Release Channel - metabolism; Sarcoplasmic Reticulum - drug effects; Sarcoplasmic Reticulum - metabolism; Sheep; Structure-Activity Relationship
• ISSN: 0006-291X
• DOI: 10.1016/j.bbrc.2004.03.073

The broad range of ligands known to modulate ryanodine receptor activity includes a class of heteroaromatic compounds displaying relatively poor efficacy. Greater understanding of the physicochemical properties that predispose these molecules to interaction with the channel should facilitate the rational design of more potent analogues. To this end we are examining the structure-activity relationship for simple heteroaromatic compounds. Efficacy is assessed by the ability to stimulate [3H]ryanodine binding to heavy sarcoplasmic reticulum vesicles. The propensity to activate the channel requires notably little chemical functionality and is associated with the capacity for charge-transfer complex formation in conjunction with steric bulk.