Detection of 2-amino-1-methyl-6-phenylimidazo [4,5-b]-pyridine (PhIP)-DNA adducts in human pancreatic tissues.

Journal Article

Recent epidemiological investigations have observed an association between the consumption of grilled or barbecued meat and an increased risk of pancreatic cancer, suggesting that dietary exposure to heterocyclic aromatic amines (HCA) may contribute to the development of this disease. 2-Amino-1-methyl-6-phenylimidazo [4,5-b]-pyridine (PhIP) is the most abundant HCA found in well-done and grilled meats. To determine whether HCA-induced DNA damage is present in the human pancreas, immunohistochemistry and computer-assisted image analysis were used to measure PhIP-DNA adducts in 54 normal pancreatic tissues (N) from persons without pancreatic cancer and in 38 normal adjacent pancreatic tissues (A) and in 39 cancer tissues (T) from 68 patients with pancreatic adenocarcinoma. PhIP-DNA adducts were detected in 53 N, 34 A and 39 T samples. Mean values (+/-SD) of the absorbency for PhIP staining were 0.22+/-0.04, 0.24+/-0.04, and 0.24+/-0.03 for N, A, and T samples, respectively (p=0.004). Using the median absorbency (0.21) of the samples from normal controls as the cut-off, 71% of A and 77% of T tissues, compared with 48% of N tissues, were distributed in the higher range (p=0.009). The odds ratio of pancreatic cancer was 3.4 (95% confidence interval 1.5-7.5, p=0.002) for individuals with a higher level of PhIP-DNA adducts. This is the first report of the detection of PhIP-DNA adducts in human pancreatic tissue samples obtained from patients with unknown exposure to HCA. Although limited by the small sample size, these preliminary results suggest that PhIP exposure may contribute to human pancreatic cancer development.

Full Text

Duke Authors

Cited Authors

  • Zhu, J; Rashid, A; Cleary, K; Abbruzzese, JL; Friess, H; Takahashi, S; Shirai, T; Li, D

Published Date

  • July 2006

Published In

Volume / Issue

  • 11 / 4

Start / End Page

  • 319 - 328

PubMed ID

  • 16908439

Electronic International Standard Serial Number (EISSN)

  • 1366-5804

International Standard Serial Number (ISSN)

  • 1354-750X

Digital Object Identifier (DOI)

  • 10.1080/13547500600667911

Language

  • eng