Erythrocytes membrane fluidity changes induced by adenylyl cyclase cascade activation: study using fluorescence recovery after photobleaching

• DOI: 10.1007/s00249-024-01707-x
• Publication Date: 2024-04-16T15:25:34Z
• Authors: A. N. Semenov; A. E. Lugovtsov; S. A. Rodionov; Eu. G. Maksimov; A. V. Priezzhev; E. A. Shirshin
• Keywords: 0301 basic medicine; ddc:500; Epinephrine; Membrane Fluidity; Erythrocyte Membrane; 500; Cyclic AMP-Dependent Protein Kinases; Erythrocytes membrane; Lipids difusion; Enzyme Activation; 03 medical and health sciences; Cyclic AMP; FRAP; Humans; Biophysics Letter; Adenylyl cyclase activation; Adenylyl Cyclases; Fluorescence Recovery After Photobleaching; Signal Transduction

AbstractIn this study, fluorescence recovery after photobleaching (FRAP) experiments were performed on RBC labeled by lipophilic fluorescent dye CM-DiI to evaluate the role of adenylyl cyclase cascade activation in changes of lateral diffusion of erythrocytes membrane lipids. Stimulation of adrenergic receptors with epinephrine (adrenaline) or metaproterenol led to the significant acceleration of the FRAP recovery, thus indicating an elevated membrane fluidity. The effect of the stimulation of protein kinase A with membrane-permeable analog of cAMP followed the same trend but was less significant. The observed effects are assumed to be driven by increased mobility of phospholipids resulting from the weakened interaction between the intermembrane proteins and RBC cytoskeleton due to activation of adenylyl cyclase signaling cascade. Graphical abstract