Catecholamine desensitization occurs prior to the development of heart failure, involving multiple mechanisms in the beta-adrenoceptor cascade that evolve over time.
This review highlights that beta-adrenoceptor desensitization precedes the clinical onset of pacing-induced heart failure and involves a progressive sequence of multiple molecular mechanisms.
The goal of this review is to emphasize four major points regarding the development of catecholamine desensitization in heart failure (HF). 2. Catecholamine desensitization occurs prior to the development of HF (i.e. after 1 day of rapid pacing, physiological responses to beta-adrenoceptor stimulation are depressed by over 50%, yet no evidence of HF is observed for 3-4 weeks of rapid pacing). 3. Multiple mechanisms in the beta-adrenoceptor cascade are involved. In HF there are decreases in beta 1-adrenoceptors, high affinity beta-adrenoceptors, adenylyl cyclase activity and messenger RNA and increases in Gi. 4. Not all mechanisms appear simultaneously (i.e. early decreases occur in high affinity beta-adrenoceptors and adenylyl cyclase; late increases in Gi and decreases in beta-adrenoceptor density evolves). 5. Mechanisms distal to cAMP generation also play a role (i.e. alterations in ryanodine receptor binding and excitation-contraction coupling also occur).
Vatner et al. (Thu,) conducted a review in Heart failure. Rapid pacing-induced heart failure was evaluated on Catecholamine desensitization. Catecholamine desensitization occurs prior to the development of heart failure, involving multiple mechanisms in the beta-adrenoceptor cascade that evolve over time.