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. 2006 Apr 5;13(2):155–164. doi: 10.1111/j.1750-3639.2003.tb00015.x

Expression of Antioxidant Enzymes in Astrocytic Brain Tumors

Hannu Haapasalo 1, Maarit Kyläniemi 1, Niina Paunu 1, Vuokko L Kinnula 3, Ylermi Soini 2,✉
PMCID: PMC8096025  PMID: 12744469

Abstract

We studied the expression of antioxidant enzymes (AOEs) and related proteins manganese superoxide dismutase (MnSOD), thioredoxin (Trx), thioredoxin reductase (TrxR), and the catalytic (GLCL‐c) and regulatory (GLCL‐r) subunits of glutamate cysteine ligase (γ‐glutamylcysteinesynthetase) in 433 astrocytomas. Expression of MnSOD was found in 91%, Trx in 46%, TrxR in 66%, GLCL‐c 73% and GLCL‐r in 89% of the cases. Diffuse astro‐cytomas showed more intense staining for Trx (p= 0.002), TrxR (p=0.004), GLCL‐c (p=0.001), GLCL‐r (p=0.04) and MnSOD (p=0.01) than pilocytic astrocytomas. Within diffuse astrocytomas only Trx (p= 0.0001) and TrxR (p=0.04) significantly associated with increased malignancy grade. Necrotic tumors were more often immunopositive for Trx (p=0.001) and TrxR (p=0.02) and AOE expression was generally higher in mitotically active tumors. Expression of Trx and lack of MnSOD expression was associated with a worse prognosis in diffuse astrocytomas. None of the AOEs had any prognostic value in pilocytic grade I astrocytomas. Familial astrocytomas, which included 23 of the cases studied, did not differ in their expression of MnSOD from sporadic ones. The results show that MnSOD and Trx may influence the biological behaviour of astrocytomas, possibly by modulating cell proliferation and necrosis in these tumors.

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