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Journal of Thermal Analysis and Calorimetry

, Volume 99, Issue 3, pp 741–747 | Cite as

Effect of amyloid beta peptides Aβ1–28 and Aβ25–40 on model lipid membranes

  • Maksim Ionov
  • Barbara Klajnert
  • Konstantinos Gardikis
  • Sophia Hatziantoniou
  • Bartlomiej Palecz
  • Bakhtiyar Salakhutdinov
  • Josep Cladera
  • Maria Zamaraeva
  • Costas Demetzos
  • Maria Bryszewska
Article

Abstract

To investigate the molecular interaction of amyloid beta peptides Aβ1–28 or Aβ25–40 with model lipid membranes differential scanning calorimetry (DSC) and DPH and TMA DPH fluorescence anisotropy approaches were used. The main transition temperature (T m) and enthalpy change (ΔH) of model lipid membranes composed of DMPC/DPPG on addition of Aβ25–40 or Aβ25–40 at 10:1 (w/w) phospholipid/peptide ratio either non-aggregated or previously aggregated were examined. The effect of Aβ1–28 and Aβ25–40 on the membrane fluidity of liposomes made of DMPC/DPPG (98:2 w/w) was determined by fluorescence anisotropy of incorporated DPH and TMA DPH. The results of this study provide information that Aβ1–28 preferentially interacts with the hydrophilic part of the model membranes, while Aβ25–40 rather locates itself in the hydrophobic core of the bilayer where it reduces the order of the phospholipids packing.

Keywords

Amyloid beta peptides DMPC membrane DPH fluorescence anisotropy DSC 

Abbreviations

β-amyloid peptide

AD

Alzheimer’s disease

Buffer

10 mM Hepes buffer pH-7.4

Cp

Heat capacity

DMPC

1,2-dimyristoyl-sn-glycero-3-phosphocholine

DPPG

Dipalmitoylphosphatidylglycerol

DPH

1,6-diphenyl-1,3,5-hexatriene

DSC

Differential scanning calorimetry

ΔH

Main phase-transition enthalpy

L:P

Lipid:peptide ratio

LUV

Large unilamellar vesicles

Tm

Gel to liquid-crystalline phase transition temperature

TMA-DPH

1-[4-(trimethyl-ammonium) phenyl]- 6-phenyl-1,3,5-hexatriene

Notes

Acknowledgements

This work was supported by POL-POSTDOC III (PBZ/MniSW/07/2006/22) Nr D077/P01/2007, Ministry of Science and High education, Poland.

Supplementary material

10973_2009_405_MOESM1_ESM.doc (34 kb)
Supplementary material 1 (DOC 34 kb)

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2009

Authors and Affiliations

  • Maksim Ionov
    • 1
  • Barbara Klajnert
    • 1
  • Konstantinos Gardikis
    • 2
  • Sophia Hatziantoniou
    • 2
  • Bartlomiej Palecz
    • 3
  • Bakhtiyar Salakhutdinov
    • 4
  • Josep Cladera
    • 5
  • Maria Zamaraeva
    • 6
  • Costas Demetzos
    • 2
  • Maria Bryszewska
    • 1
  1. 1.Department of General BiophysicsUniversity of LodzLodzPoland
  2. 2.Department of Pharmaceutical TechnologySchool of Pharmacy University of AthensAthensGreece
  3. 3.Department of Physical ChemistryUniversity of LodzLodzPoland
  4. 4.Institute of Bioorganic Chemistry, ASRUTashkentUzbekistan
  5. 5.Unitat de Biofisica, Departament de Bioquimica i de Biologia MolecularUniversitat Autónoma de BarcelonaBellaterraSpain
  6. 6.Department of BiophysicsUniversity of BialystokBialystokPoland

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