The effect of botulinum toxin type D on the triggered and constitutive exocytosis/endocytosis cycles in cultures of bovine adrenal medullary cells

FEBS Letters

Borges, Ricardo¹  von Grafenstein, Herman¹  Knight, Derek E.¹ 

[1] Biomedical Sciences Division, King's College London, London W8 7AH, UK

关键词: Endocytosis;    Vesicular;    Botulinum toxin;    Exocytosis;    Chromaffin cell;    Fluid phase uptake;   

DOI  :  10.1016/0014-5793(92)80035-F

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

The extracellular fluid phase marker, horseradish peroxidase, enters chromaffin cells when triggered to secrete catecholamine. This triggered uptake, like secretion, is abolished in cells pre-incubated with botulinum toxin. Endocytosis of horseradish peroxidase into unstimulated cells is unaffected by botulinum toxin but is inhibited when the temperature is reduced. Once internalised by the unstimulated cells, horseradish peroxidase is released back into the extracellular fluid, the rate of release being temperature sensitive but unaffected by carbamylcholine or botulinum toxin. These results suggest that triggered exocytosis is a necessary event to precede triggered endocytosis, and that botulinum toxin may affect only the triggered exocytosis/endocytosis cycle and not the constitutive cycle.

【 授权许可】

Unknown