Effect of Caspase Inhibition on Thymic Apoptosis in Hemorrhagic Shock

In hemorrhagic shock (HS) an increased thymic apoptosis (TA) was described. The aim of this study was to evaluate the effect of administration of the caspase inhibitor N-benzyloxy-carbonil-Val-Ala-Asp-fluoromethylketone (Z-VAD-FMK) during the resuscitation phase on TA, organ dysfunctions, and tumor...

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Bibliographic Details
Published in:Journal of investigative surgery 2007-03, Vol.20 (2), p.97-103
Main Authors: Bini, Roberto, Cursio, Raffaele, Belhacene, Nathalie, Giudicelli, Jean, Ferruà, Bernard, Olivero, Giorgio, Auberger, Patrick, Mari, Bernard, Gugenheim, Jean, Cotogni, Paolo
Format: Article
Language:English
Subjects:
Amino Acid Chloromethyl Ketones - pharmacology
Animals
apoptosis
Apoptosis - drug effects
Caspase Inhibitors
Caspases - metabolism
Enzyme Inhibitors - pharmacology
hemorrhage
Male
Rats
Rats, Sprague-Dawley
shock
Shock, Hemorrhagic - pathology
thymus
Thymus Gland - drug effects
Thymus Gland - pathology
Time Factors
TNF-α
Tumor Necrosis Factor-alpha - metabolism
Z-VAD-FMK
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Summary:In hemorrhagic shock (HS) an increased thymic apoptosis (TA) was described. The aim of this study was to evaluate the effect of administration of the caspase inhibitor N-benzyloxy-carbonil-Val-Ala-Asp-fluoromethylketone (Z-VAD-FMK) during the resuscitation phase on TA, organ dysfunctions, and tumor necrosis factor (TNF)-α release in HS. Forty rats were randomly assigned to four groups: no HS/resuscitation (sham); HS/resuscitation with shed blood and normal saline (control); HS/resuscitation with shed blood and phosphate-buffered solution (PBS) (vehicle); and HS/resuscitation with shed blood and Z-VAD-FMK (inhibitor). Rats were subjected to HS by blood removal to a MAP of 35-40 mmHg. After a 1-h shock period, the animals were resuscitated according to the protocol. At 1 and 3 h after resuscitation, transaminases, creatinine, urea, lipase, TNF-α, and TA were evaluated. Our study showed that a nonlethal HS is early able to induce organ dysfunctions and increased TA. Administration of Z-VAD-FMK did not significantly decrease organ dysfunctions, while it induced a significant TNF-α release. TA was significantly reduced by Z-VAD-FMK after 1 h, but not after 3 h. Our results suggest that postinjury caspase inhibition does not attenuate organ dysfunctions, and also does not permanently reduce TA induced by HS and resuscitation in rats.
ISSN:0894-1939
1521-0553
DOI:10.1080/08941930701235445