Cell Biology and Toxicology

, Volume 26, Issue 3, pp 215–223

Hsp70 expression in monocytes from patients with peripheral arterial disease and healthy controls

Monocyte Hsp70 in PAD
  • Jacqueline Madden
  • Jenifer C. Coward
  • Cliff P. Shearman
  • Robert F. Grimble
  • Philip C. Calder
Article

DOI: 10.1007/s10565-009-9134-x

Cite this article as:
Madden, J., Coward, J.C., Shearman, C.P. et al. Cell Biol Toxicol (2010) 26: 215. doi:10.1007/s10565-009-9134-x

Abstract

Background

Heat shock proteins (HSP) are induced during cellular stress. Their role is to chaperone cellular proteins giving protection from denaturation and ultimately preventing cell death. Monocytes are key cells involved in atherosclerosis and are highly responsive to HSP induction. Therefore, we wished to examine monocyte Hsp70 expression and induction in patients with peripheral arterial disease (PAD) and in healthy controls.

Methods

We measured cellular Hsp70 levels in freshly isolated monocytes and released Hsp70 levels in plasma and monocyte culture supernatants, obtained from patients with PAD and from healthy controls. We assessed the effect of statin therapy on Hsp70 levels and examined monocyte cell survival in culture with and without immunological stress.

Results

Monocyte cellular Hsp70 was lower in patients with PAD compared to healthy controls (11.3 ± 7.4 ng/106 cells vs 20.7 ± 16.0 ng/106 cells; p < 0.001). Individuals on statin therapy from both PAD and control groups had lower monocyte Hsp70 compared to those not treated with statins. Concentrations of Hsp70 released into culture supernatants were not dependent on PAD or statin therapy. Cell survival was inversely associated with Hsp70 concentrations in culture supernatants but had no association with cellular concentrations of Hsp70.

Conclusions

Cellular Hsp70 and released Hsp70 may play different roles in monocyte health. Whilst induced Hsp70 destined for release appears to be unaffected in PAD, mechanisms responsible for cellular retention of Hsp70 may provide an area for future therapeutic targets in vascular disease.

Keywords

Cell survivalHsp70MonocytePADStatinInflammation

Abbreviations

PAD

Peripheral arterial disease

Hsp70

Heat shock protein 70

ABPI

Ankle brachial pressure index

CRP

C-reactive protein

Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • Jacqueline Madden
    • 1
  • Jenifer C. Coward
    • 1
  • Cliff P. Shearman
    • 1
  • Robert F. Grimble
    • 1
  • Philip C. Calder
    • 1
  1. 1.Institute of Human Nutrition, School of MedicineUniversity of SouthamptonSouthamptonUK