Shedding of membrane vesicles mediates fibroblast growth factor-2 release from cells

Giulio Ghersi, Simona Taverna, Giuseppe Pizzolanti, Salvatrice Rigogliuso, Antonio Pavan, Marco Presta, Giuseppe Pizzolanti, Vincenza Dolo, Patrizia Dell'Era, Maria Letizia Vittorelli, Paolo Mignatti, Maria Letizia Vittorelli

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100 Citazioni (Scopus)


Fibroblast growth factor-2 (FGF-2), a polypeptide with regulatory activity on cell growth and differentiation, lacks a conventional secretory signal sequence, and its mechanism of release from cells remains unclear. We characterized the role of extracellular vesicle shedding in FGF-2 release. Viable cells released membrane vesicles in the presence of serum. However, in serum-free medium vesicle shedding was dramatically down-regulated, and the cells did not release FGF-2 activity into their conditioned medium. Addition of serum to serum-starved cells rapidly induced intracellular FGF-2 clustering under the plasma membrane and into granules that colocalized with patches of the cell membrane with typical features of shed vesicle membranes. Shed vesicles carried three FGF-2 isoforms (18, 22, 24 kDa). Addition of vesicles to endothelial cells stimulated chemotaxis and urokinase plasminogen activator production, which were blocked by anti-FGF-2 antibodies. Treatment of intact vesicles with 2.0 M NaCl or heparinase, which release FGF-2 from membrane-bound proteoglycans, did not abolish their stimulatory effect on endothelial cells, indicating that FGF-2 is carried inside vesicles. The comparison of the stimulatory effects of shed vesicles and vesicle-free conditioned medium showed that vesicles represent a major reservoir of FGF-2. Thus, FGF-2 can be released from cells through vesicle shedding
Lingua originaleEnglish
pagine (da-a)51911-51919
Numero di pagine9
Stato di pubblicazionePublished - 2003

All Science Journal Classification (ASJC) codes

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