title: Introduction of macromolecules into bovine adrenal medullary chromaffin cells and rat pheochromocytoma cells (PC12) by permeabilization with streptolysin O: inhibitory effect of tetanus toxin on catecholamine secretion.
abstract: Conditions are described for controlled plasma membrane permeabilization of rat pheochromocytoma cells (PC12) and cultured bovine adrenal chromaffin cells by streptolysin O (SLO). The transmembrane pores created by SLO invoke rapid efflux of intracellular 86Rb+ and ATP, and also permit passive diffusion of proteins, including immunoglobulins, into the cells. SLO-permeabilized PC12 cells release [3H]dopamine in response to micromolar concentrations of free Ca2+. Permeabilized adrenal chromaffin cells present a similar exocytotic response to Ca2+ in the presence of Mg2+/ATP. Permeabilized PC12 cells accumulate antibodies against synaptophysin and calmodulin, but neither antibody reduces the Ca2+-dependent secretory response. Reduced tetanus toxin, although ineffective when applied to intact chromaffin cells, inhibits Ca2+-induced exocytosis by both types of permeabilized cells studied. Omission of dithiothreitol, toxin inactivation by boiling, or preincubation with neutralizing antibodies abolishes the inhibitory effect. The data indicate that plasma membrane permeabilization by streptolysin O is a useful tool to probe and define cellular components that are involved in the final steps of exocytosis.
authors.affiliation: Abteilung Anatomie und Zellbiologie, Universität Ulm, F.R.G.
authors.forename: G
authors.initials: G
authors.lastname: Ahnert-Hilger
authors.forename: M F
authors.initials: MF
authors.lastname: Bader
authors.forename: S
authors.initials: S
authors.lastname: Bhakdi
authors.forename: M
authors.initials: M
authors.lastname: Gratzl
mesh_terms: D000313:Adrenal Medulla / Q000166:cytology / Q000378:metabolism*; D000818:Animals; D000906:Antibodies / Q000502:physiology; D001426:Bacterial Proteins; D002118:Calcium / Q000494:pharmacology; D002395:Catecholamines / Q000378:metabolism; D002417:Cattle; D002463:Cell Membrane Permeability / Q000187:drug effects; D002838:Chromaffin System / Q000166:cytology / Q000378:metabolism*; D004298:Dopamine / Q000378:metabolism; D005089:Exocytosis / Q000187:drug effects; D046911:Macromolecular Substances; D009994:Osmolar Concentration; D010673:Pheochromocytoma; D051381:Rats; D013301:Streptolysins / Q000494:pharmacology*; D013744:Tetanus Toxin / Q000494:pharmacology; D014407:Tumor Cells, Cultured
chemical_list: D000906:Antibodies; D001426:Bacterial Proteins; D002395:Catecholamines; D046911:Macromolecular Substances; D013301:Streptolysins; D013744:Tetanus Toxin; C025964:streptolysin O; D002118:Calcium; D004298:Dopamine