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Vol. 10, Issue 5, 1463-1475, May 1999

The Secretory Route of the Leaderless Protein Interleukin 1beta Involves Exocytosis of Endolysosome-related Vesicles

Cristina Andrei,* Cecilia Dazzi,* Lavinia Lotti,dagger Dagger Maria Rosaria Torrisi,Dagger § Giovanna Chimini,parallel and Anna Rubartelli*

 *National Cancer Institute, 16132 Genova, Italy;  dagger National Cancer Institute of Genova, Biotechnology Section, Rome, Italy;  Dagger Department of Experimental Medicine and Pathology, University of Rome "La Sapienza," 00167 Rome, Italy;  §Istituto Dermatologico San Gallicano, Istituto di Ricovero e Cura a Carattere Scientifico, 00100 Rome, Italy; and  parallel Centre d'Immunologie de Marseille-Luminy, 13288 Marseille, France

Interleukin 1beta (IL-1beta ), a secretory protein lacking a signal peptide, does not follow the classical endoplasmic reticulum-to-Golgi pathway of secretion. Here we provide the evidence for a "leaderless" secretory route that uses regulated exocytosis of preterminal endocytic vesicles to transport cytosolic IL-1beta out of the cell. Indeed, although most of the IL-1beta precursor (proIL-1beta ) localizes in the cytosol of activated human monocytes, a fraction is contained within vesicles that cofractionate with late endosomes and early lysosomes on Percoll density gradients and display ultrastructural features and markers typical of these organelles. The observation of organelles positive for both IL-1beta and the endolysosomal hydrolase cathepsin D or for both IL-1beta and the lysosomal marker Lamp-1 further suggests that they belong to the preterminal endocytic compartment. In addition, similarly to lysosomal hydrolases, secretion of IL-1beta is induced by acidotropic drugs. Treatment of monocytes with the sulfonylurea glibenclamide inhibits both IL-1beta secretion and vesicular accumulation, suggesting that this drug prevents the translocation of proIL-1beta from the cytosol into the vesicles. A high concentration of extracellular ATP and hypotonic medium increase secretion of IL-1beta but deplete the vesicular proIL-1beta content, indicating that exocytosis of proIL-1beta -containing vesicles is regulated by ATP and osmotic conditions.


   Corresponding author. E-mail address: annarub{at}hp380.ist.unige.it.


Molecular Biology of the Cell
Vol. 10, 1463-1475, May 1999
Copyright © 1999 by The American Society for Cell Biology



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Secretion of bioactive interleukin-1beta by dendritic cells is modulated by interaction with antigen specific T cells
Blood, June 15, 2000; 95(12): 3809 - 3815.
[Abstract] [Full Text] [PDF]


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J. Immunol.Home page
I. Walev, J. Klein, M. Husmann, A. Valeva, S. Strauch, H. Wirtz, O. Weichel, and S. Bhakdi
Potassium Regulates IL-1{beta} Processing Via Calcium-Independent Phospholipase A2
J. Immunol., May 15, 2000; 164(10): 5120 - 5124.
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Proc. Natl. Acad. Sci. USAHome page
A. T. Remaley, S. Rust, M. Rosier, C. Knapper, L. Naudin, C. Broccardo, K. M. Peterson, C. Koch, I. Arnould, C. Prades, et al.
Human ATP-binding cassette transporter 1 (ABC1): Genomic organization and identification of the genetic defect in the original Tangier disease kindred
PNAS, October 26, 1999; 96(22): 12685 - 12690.
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J. Biol. Chem.Home page
O. Moltedo, C. Verde, A. Capasso, E. Parisi, P. Remondelli, S. Bonatti, X. Alvarez-Hernandez, J. Glass, C. G. Alvino, and A. Leone
Zinc Transport and Metallothionein Secretion in the Intestinal Human Cell Line Caco-2
J. Biol. Chem., October 6, 2000; 275(41): 31819 - 31825.
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Proc. Natl. Acad. Sci. USAHome page
F. Leoni, A. Zaliani, G. Bertolini, G. Porro, P. Pagani, P. Pozzi, G. Dona, G. Fossati, S. Sozzani, T. Azam, et al.
The antitumor histone deacetylase inhibitor suberoylanilide hydroxamic acid exhibits antiinflammatory properties via suppression of cytokines
PNAS, March 5, 2002; 99(5): 2995 - 3000.
[Abstract] [Full Text] [PDF]




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