Alterations in lipid peroxidation and antioxidant status in different types of intracranial tumors within their relative peritumoral tissues.
OBJECTIVE
Elevated levels of lipid peroxidation and changes in the concentration of enzymatic and non-enzymatic antioxidant systems have been reported in various cancers, but there are very few reports available of lipid peroxidation due to oxidative stress in patients with intracranial neoplasms. The purpose of this study was to assess alterations in lipid peroxidation and antioxidant status in different types of tumors and to compare the results with their relative peritumoral tissues and compare the oxidative status in different grades of tumors.


METHODS
We investigated the extent of oxidative stress and the levels of antioxidants in 16 astrocytomas and 38 other different types intracranial tumors comparing the results with their corresponding peritumoral tissues and comparing the levels in between low-grade and high-grade tumors. The extent of lipid peroxidation as evidenced by the formation of thiobarbituric acid-reacting substances (TBARS), as well as the status of the antioxidant systems such as superoxide dismutase (SOD), glutathione reductase (GR) and reduced glutathione (GSH) in tumor tissues and adjacent peritumoral tissues was estimated. The tumoral tissues were also compared as to their degrees of malignancy.


RESULTS
According to our results lipid peroxidation in brain tumor tissues was enhanced compared to the corresponding adjacent peritumoral tissues. This was accompanied by a significant tumoral decrease in both enzymatic and non-enzymatic antioxidants. The low levels of antioxidants in tumor tissues, might be related to an increased use of antioxidant systems to scavenge lipid peroxides. Also a striking elevation in TBARS levels, and decrease in SOD activity and GSH levels were seen in high-grade tumors when compared with low grades.


CONCLUSIONS
These findings emphasize a consistent difference in the level of antioxidants between the tumoral sample and its corresponding peritumoral tissue, independently of the tumoral type, and the most pivotal action would seem to minimise exposure to endogenous and exogenous sources of oxidative stress.
Zengin
Emel
E
Department of Biochemistry, Cerrahpasa Medical Faculty, Istanbul University, Istanbul, Turkey.
Atukeren
Pinar
P
Kokoglu
Emine
E
Gumustas
M Koray
MK
Zengin
Umit
U
D000328:Adult; D000368:Aged; D000704:Analysis of Variance; D000975:Antioxidants / Q000378:metabolism*; D001254:Astrocytoma / Q000378:metabolism* / Q000473:pathology*; D001932:Brain Neoplasms / Q000378:metabolism* / Q000473:pathology*; D018450:Disease Progression; D005978:Glutathione / Q000378:metabolism; D005980:Glutathione Reductase / Q000378:metabolism; D006801:Humans; D015227:Lipid Peroxidation; D008579:Meningioma / Q000378:metabolism / Q000473:pathology; D008875:Middle Aged; D009367:Neoplasm Staging / Q000379:methods; D018384:Oxidative Stress; D013053:Spectrophotometry; D013482:Superoxide Dismutase / Q000378:metabolism; D017392:Thiobarbituric Acid Reactive Substances / Q000378:metabolism; D015854:Up-Regulation
D000975:Antioxidants; D017392:Thiobarbituric Acid Reactive Substances; D013482:Superoxide Dismutase; D005980:Glutathione Reductase; D005978:Glutathione