Related Experiment Video
Updated: Aug 19, 2026

"Phagosome Closure Assay" to Visualize Phagosome Formation in Three Dimensions Using Total Internal Reflection Fluorescent Microscopy (TIRFM)
Published on: August 26, 2016
Beta-adrenergic stimulation of phagocytosis in the unicellular eukaryote Paramecium aurelia
1Department of Cell Biology, Nencki Institute of Experimental Biology, Warsaw, Poland.
Abstract:
Bete-adrenergic agonists isoproterenol and norepinephrine enhanced phagocytosis in Paramecium. Stimulation was stereospecific, dose-dependent and inhibited by the beta-agonists propranolol and alprenolol. Phorbol ester and forskolin potentiated the stimulatory effect of catecholamines on Paramecium phagocytosis. The dansyl analogue of propranolol (DAPN) was used for fluorescent visualization of the beta-adrenergic receptor sites in Paramecium which have been found to be localized at the cell membrane and within the membrane of the nascent digestive vacuoles. The appearance of the characteristic fluorescent pattern has been blocked by 1-propranolol.
Related Concept Videos
Phagocytosis
Phagocytosis
The objective of phagocytosis is often destruction. Cells use phagocytosis to eliminate unwelcome visitors, like pathogens (e.g., viruses and bacteria). Many immune system cells, including...
GPCRs Regulate Adenylyl Cylase Activity
Two...
cAMP-dependent Protein Kinase Pathways
Adherens Junctions
Adherens Junctions are Dynamic
The endothelial cells...
Chemotaxis in E. coli

