Document Detail

Accumulation of mitochondrial DNA deletions in human oral tissues -- effects of betel quid chewing and oral cancer.
MedLine Citation:
PMID:  11516716     Owner:  NLM     Status:  MEDLINE    
Accumulation of mitochondrial DNA (mtDNA) mutations in human tissues has been associated with intrinsic aging and environmental insult. Recently, mtDNA mutations have been detected in various tumors, including head and neck tumors. However, the factors affecting the occurrence and accumulation of mtDNA deletions in tumor tissues are poorly understood. In Taiwan, betel quid chewing is a major risk factor for oral cancer. Using polymerase chain reaction (PCR) techniques, we examined large-scale deletions of mtDNA in 53 pairs of tumor and non-tumor oral tissues from the patients with or without betel quid chewing history. The results revealed that irrespective of the history of betel quid chewing, the incidences of the 4977bp deletion and other deletions of mtDNA were lower in the tumor portion as compared with the non-tumor portion. The average proportions of the 4977bp deleted mtDNA in the tumor tissues of the betel quid chewers and non-betel quid chewers were 13- and 5-fold, respectively, lower than those in the corresponding non-tumor tissues. Moreover, the average proportion of 4977bp deleted mtDNA was significantly higher (P<0.05) in the non-tumor oral tissues of the patients with betel quid chewing history than that of the patients without the history of betel quid chewing. These results suggest that betel quid chewing may increase mtDNA mutation in human oral tissues and that accumulation of mtDNA deletions and subsequent cytoplasmic segregation of these mutations during cell division could be an important contributor to the early phase of oral carcinogenesis.
H C Lee; P H Yin; T N Yu; Y D Chang; W C Hsu; S Y Kao; C W Chi; T Y Liu; Y H Wei
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Mutation research     Volume:  493     ISSN:  0027-5107     ISO Abbreviation:  Mutat. Res.     Publication Date:  2001 Jun 
Date Detail:
Created Date:  2001-08-22     Completed Date:  2001-09-13     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0400763     Medline TA:  Mutat Res     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  67-74     Citation Subset:  IM    
Department of Biochemistry and Center for Cellular and Molecular Biology, National Yang-Ming University, Taipei 112, Taiwan, ROC.
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MeSH Terms
Areca / adverse effects*
Carcinoma, Squamous Cell / etiology,  genetics
DNA Damage
DNA, Mitochondrial / genetics*
Mouth / metabolism*
Mouth Neoplasms / etiology*,  genetics*
Plants, Medicinal*
Polymerase Chain Reaction
Risk Factors
Sequence Deletion*
Reg. No./Substance:
0/DNA, Mitochondrial

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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