|
||
J. Exp. Med.,
Volume 188, Number 9, November 2, 1998 1757-1762
By

From the * Novartis Forschungsinstitut, A-1235 Vienna, Austria; and the The expression and secretion of interleukin (IL)-8, the prototype member of the C-X-C subfamily of chemokines, can be induced by diverse inflammatory stimuli in many cells, including
endothelial cells (EC). Upon de novo synthesis, IL-8 localizes intracellularly in the Golgi apparatus, from where it is secreted. In addition to this constitutive secretory pathway, we describe
a depot storage and separate regulated secretory pathway of IL-8 in EC.
The prolonged stimulation of primary human EC with inflammatory mediators resulted in
the accumulation of IL-8 in Weibel-Palade bodies, where it colocalized with von Willebrand
factor. IL-8 was retained in these storage organelles for several days after the removal of the
stimulus and could be released by EC secretagogues such as phorbol myristate acetate, the calcium ionophore A23187, and histamine. These findings suggest that storage of IL-8 in Weibel-Palade bodies may serve as the EC "memory" of a preceding inflammatory insult, which then
enables the cells to secrete IL-8 immediately without de novo protein synthesis.
Children's Nutrition
Research Center, Baylor College of Medicine, Houston, Texas 77030-2600
This article has been cited by other articles:
| TABLE OF CONTENTS |
|