Inflammation Research

, Volume 58, Issue 1, pp 30–37 | Cite as

Activation by C5a of endothelial cell caspase 8 and cFLIP

Article

Abstract.

Objectives and design:

In this study, we examine the relationship between C5a and activation of cysteine aspartic acid protease 8 (caspase 8) in human umbilical vein endothelial cells (HUVEC).

Materials or subjects:

Primary cultures of HUVEC were used.

Treatments:

Recombinant human C5a (50 ng/ml) was used in the presence or absence of 10 μg/ml cycloheximide (CHX).

Methods:

HUVEC were treated with C5a alone and in the presence of CHX, then monitored for cell viability, poly- ADP-ribose 1 (PARP-1) and caspase 8 activities. Gene and protein expressions were assessed for caspase 8 and the caspase 8 homologue, FLICE –inhibitory protein (cFLIP).

Results:

We found a 43.1 ± 6.9 percent reduction in viability of HUVEC stimulated for 18 h with 50 ng/ml C5a in the presence of 10 μg/ml CHX (p < 0.05). In contrast, the cell viability of cells stimulated for 18 h with 50 ng/ml C5a or 10 μg/ml CHX alone was not significantly different compared to the non-stimulated control. Treatment of HUVEC with C5a induced an increase in caspase 8 activity but did not significantly affect cFLIP levels.

Conclusions:

These data suggest caspase 8 activation induced by C5a leads to cell death if protein synthesis of antiapoptotic protein(s) is blocked.

Keywords:

Complement factor 5a (C5a) Cycloheximide (CHX) Caspase 8 Caspase 8 homologue FLICE Inhibitory protein (cFLIP) 

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Copyright information

© Birkhäuser Verlag, Basel 2009

Authors and Affiliations

  1. 1.Department of Biology and PhysicsKennesaw State UniversityKennesawUSA
  2. 2.Department of PathologyUniversity of Michigan Medical SchoolAnn ArborUSA

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