, Volume 18, Issue 4, pp 373–384

Apoptotic cells selectively uptake minor glycoforms of vitronectin from serum

  • Nadia Malagolini
  • Mariangela Catera
  • Hugo Osorio
  • Celso A. Reis
  • Mariella Chiricolo
  • Fabio Dall’Olio
Original Paper

DOI: 10.1007/s10495-013-0812-z

Cite this article as:
Malagolini, N., Catera, M., Osorio, H. et al. Apoptosis (2013) 18: 373. doi:10.1007/s10495-013-0812-z


Apoptosis profoundly alters the carbohydrate layer coating the membrane of eukaryotic cells. Previously we showed that apoptotic cells became reactive with the α2,6-sialyl-specific lectin from Sambucus nigra agglutinin (SNA), regardless of their histological origin and the nature of the apoptotic stimulus. Here we reveal the basis of the phenomenon by showing that in apoptotic cancer cell lines SNA reactivity was mainly associated with a 67 kDa glycoprotein which we identified by MALDI-TOF/TOF and immunoblot analysis as bovine vitronectin (bVN). bVN was neither present in non-apoptotic cells, nor in cells induced to apoptosis in serum-free medium, indicating that its uptake from the cell culture serum occurred only during apoptosis. The bVN molecules associated with apoptotic cancer cell lines represented minor isoforms, lacking the carboxyterminal sequence and paradoxically containing a few α2,6-linked sialic acid residues. Despite their poor α2,6-sialylation, these bVN molecules were sufficient to turn apoptotic cells to SNA reactivity, which is a late apoptotic event occurring in cells positive to both annexin-V and propidium iodide. Unlike in cancer cell lines, the major bVN form taken up by apoptotic neutrophils and mononuclear cells was a 80 kDa form. In apoptotic SW948 cells we also detected the α2,6-sialylated forms of the stress-70 mitochondrial precursor (mortalin) and of tubulin-β2C. These data indicate that the acquisition of vitronectin isoforms from the environment is a general, although cell specific phenomenon, potentially playing an important role in post-apoptotic events and that the α2,6-sialylation of intracellular proteins is a new kind of posttranslational modification associated with apoptosis.







Bovine vitronectin


Fetal calf serum




Poly (ADP-ribose) polymerase


Peripheral blood mononuclear cells


Propidium iodide


Polymorphonuclear neutrophils

PNGase F

Peptide N-glycanase F


Sambucus nigra agglutinin



Supplementary material

10495_2013_812_MOESM1_ESM.doc (46 kb)
Supplementary material 1 (DOC 46 kb)
10495_2013_812_MOESM2_ESM.ppt (138 kb)
Supplementary material 2 (PPT 138 kb)
10495_2013_812_MOESM3_ESM.ppt (404 kb)
Supplementary material 3 (PPT 404 kb)
10495_2013_812_MOESM4_ESM.ppt (311 kb)
Supplementary material 4 (PPT 311 kb)

Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Nadia Malagolini
    • 1
  • Mariangela Catera
    • 1
  • Hugo Osorio
    • 2
    • 3
  • Celso A. Reis
    • 2
    • 3
    • 4
  • Mariella Chiricolo
    • 1
  • Fabio Dall’Olio
    • 1
  1. 1.Department of Experimental, Diagnostic and Specialty MedicineDIMES, University of BolognaBolognaItaly
  2. 2.Institute of Molecular Pathology and ImmunologyUniversity of Porto-IPATIMUPPortoPortugal
  3. 3.Faculty of MedicineUniversity of PortoPortoPortugal
  4. 4.Institute of Biomedical Sciences of Abel Salazar (ICBAS)PortoPortugal