Association between mitochondrial DNA 4,977 bp deletion and NAD(P)H:quinone oxidoreductase 1 C609T polymorphism in human breast tissues.

Abstract:

:The NAD(P)H:quinone oxidoreductase 1 (NQO1) enzyme is implicated in protection against oxidative stress and carcinogenesis. NQO1 C609T genetic polymorphism was reported to be associated with an increased risk for cancers, including breast cancer. However, there is still lack of evidence whether higher oxidative stress occurs in breast tissues of patients with NQO1 609 C/T and/or T/T genotypes. Mitochondrial DNA (MtDNA) 4,977-bp deletion, the most common mutation of mtDNA, was frequently detected in post-mitotic tissues of aged subjects and associated with oxidative damage. In this study, we detected the mtDNA 4,977-bp deletion in 60 breast cancers and corresponding non-cancerous breast tissues. The incidence of the common 4,977-bp deletion in non-cancerous breast tissues (48.3%) was higher than that in breast cancer (5.0%). Moreover, 63.4% of the breast cancer patients with NQO1 C/T or T/T genotypes had the deletion in their non-cancerous breast tissues. The mtDNA deletion was more frequently detected in breast tissue of NQO1 C/T carriers (65.2%) and T/T carriers (61.1%) as compared with the NQO1 C/C carriers (15.8%, P=0.003). Similar results were observed in the <50 years old (y/o) group (P=0.06) and the > or =50 y/o group (P=0.005). Our findings suggest that mtDNA 4,977-bp deletion associated with NQO1 deficiency is involved in carcinogenesis and progression of breast cancer.

journal_name

Oncol Rep

journal_title

Oncology reports

authors

Tseng LM,Yin PH,Tsai YF,Chi CW,Wu CW,Lee LM,Lee HC

doi

10.3892/or_00000337

subject

Has Abstract

pub_date

2009-05-01 00:00:00

pages

1169-74

issue

5

eissn

1021-335X

issn

1791-2431

journal_volume

21

pub_type

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