Virchows Archiv A

, Volume 420, Issue 2, pp 139–148 | Cite as

Amyloid enhancing factor activity is associated with ubiquitin

  • Kamel Alizadeh-Khiavi
  • Josée Normand
  • Soula Chronopoulos
  • Ambereen Ali
  • Zafer Ali-Khan
Original Articles


Crude amyloid enhancing factor (AEF) drastically reduces the pre-amyloid phase on passive transfer and induces amyloid deposition in the recipient mice in 48–120h. We attempted to purify AEF from murine amyloidotic liver and spleen extracts by using gel filtration, preparative sodium dodecyl sulphate-polyacrylamide gel electrophoresis and ion exchange chromatography and isolated a 5.5. kDa peptide. In the mouse bioassay, this peptide induced accelerated splenic AA deposition in a dose-dependent manner. Based on structural, electrophoretic and immunochemical criteria the peptide was identified as ubiquitin. A polyclonal rabbit anti-bovine ubiquitin IgG antibody (RABU) abolished the in vivo AEF activity of crude murine AEF in a dose-dependent manner. Monomeric ubiquitin and its large molecular weight adducts were isolated from crude AEF using cyanogen bromide-activated sepharose conjugated to RABU and size exclusion chromatography methods. These were assayed and were found to possess AEF activity. Furthermore, increased levels of ubiquitin, a phenomenon similar to that of AEF, were detected by immunocytochemistry in mouse peritoneal leucocytes prior to and during amyloid deposition. Since AEF shares a number of biological and functional properties with ubiquitin, we suggest a possible role of ubiquitin as an AEF, and that serum amyloid protein A and ubiquitin, the two reactants generated during inflammatory stress conditions, may converge to induce AA amyloid deposition

Key words

Amyloid enhancing factor Ubiquitin Amino acid sequencing anti-ubiquitin antibody Immunocytochemistry 


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Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • Kamel Alizadeh-Khiavi
    • 1
  • Josée Normand
    • 1
  • Soula Chronopoulos
    • 1
  • Ambereen Ali
    • 1
  • Zafer Ali-Khan
    • 1
  1. 1.Department of Microbiology and ImmunologyMcGill UniversityMontrealCanada

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