Journal
BRITISH JOURNAL OF HAEMATOLOGY
Volume 141, Issue 5, Pages 676-680Publisher
WILEY-BLACKWELL
DOI: 10.1111/j.1365-2141.2008.07093.x
Keywords
hypoxia inducible factor; thioredoxin; lymphoma; prognosis; tissue microarray
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Funding
- NCI NIH HHS [K23 CA109613-A1, K23 CA109613-03, K23 CA109613] Funding Source: Medline
- NHLBI NIH HHS [R01 HL035440, HL35440] Funding Source: Medline
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Hypoxia inducible factors (HIFs) activate oncogenic pathways, while thioredoxins (Trx), including Trx1 and Trx reductases-1 and -2 (TrxR1 and TrxR2), promote HIF-alpha stabilization. In immunoblotting studies in lymphoma cell lines we found that Raji and SUDHL4 cells exhibited normoxic HIF-2 alpha protein stabilization. Five cell lines showed increased TrxR1 expression, while only Namalwa, HF1 and SUDHL4 had Trx1 and TrxR2 activation. Tissue microarrays in diffuse large B-cell lymphoma (DLBCL) and follicular lymphoma (FL) identified different HIF expression among histological subgroups (e.g. 44% DLBCL vs. 11% of FL cases with moderate-to-high expression of HIF-1 alpha and HIF-2 alpha, P = 0.0017). These data demonstrate that HIF and the thioredoxin family are abnormally activated in lymphoma.
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