Thiopentalanflutung im Plasma während Narkoseeinleitung

Sevoflurane and thiopental preconditioning attenuates the migration and activity of MMP-2 in U87MG glioma cells

BACKGROUND

Tumor cell migration and diffuse infiltration into brain parenchyma are known causes of recurrence after treatment in glioblastoma (GBM), mediated in part by the interaction of glioma cells with the extracellular matrix, followed by degradation of matrix by tumor cell derived proteases, particularly the matrix metalloproteinases (MMP). Sevoflurane and thiopental are anesthetics commonly used in cancer surgery. However, their effect on the progression of glioma cells remains unclear. The aim of this study was to explore the role of these anesthetics on the migration and activity of MMP-2 in glioma cells.

METHODOLOGY

Cultured U87MG cells were pretreated with sevoflurane or thiopental and in vitro wound healing scratch assay was carried out to analyze their effect on migration of these cells. Gelatin zymography was carried out to examine the effect of these anesthetics on tumor cell MMP-2 activity using the conditioned media 24 h after pretreatment. Cell viability was analyzed using 3-[4,5-dimethylthiazol-2-yl]-2,5 diphenyl tetrazolium bromide (MTT) assay.

RESULTS

U87MG cells exposed to 2.5% sevoflurane or different concentrations of thiopental significantly decreased migration and activity of MMP-2 compared to control. No effect was seen on the viability of these cells after pretreatment with sevoflurane or thiopental.

CONCLUSION/SIGNIFICANCE

These results suggest that both sevoflurane and thiopental have inhibitory effect on the migration and MMP-2 activity in glioma cells. Thus, it is important that the choice of anesthetics to be used during glioma surgery takes into account their inhibitory properties against the tumor cells.

Effects of thiopental on granulocyte oxidative microbicidal capacity

Some anaesthetics are known to depress granulocyte chemiluminescence responses in the phagocytosis of zymosan as a measure of their oxidative microbicidal capacity. In this study the effects of thiopental were measured on chemiluminescence responses in the phagocytosis of Staphylococcus aureus and Escherichia coli, which are the commonest bacteria causing postoperative infections. Granulocytes from 14 healthy volunteers (mean age 35 +/- 9 (s.d.) years) were tested in vitro in the presence of clinical thiopental concentrations 0, 5, 10 and 25 micrograms/ml (0, 18, 36 and 91 mumol/l, respectively). During a 60-min exposure period, decreased chemiluminescence responses occurred to Staph. aureus at 5 micrograms/ml (P less than 0.01) and higher thiopental concentrations and to E. coli at 10 micrograms/ml (P less than 0.01) and higher concentrations, as a sign of depressed oxidative microbicidal activity.