RT Journal Article
SR Electronic
T1 Loss of Heterozygosity and Nonsense Mutation in Apc in Azoxymethane-induced Colonic Tumours in Min Mice
JF Anticancer Research
JO Anticancer Res
FD International Institute of Anticancer Research
SP 2595
OP 2600
VO 24
IS 5A
A1 LINDA MØLLERSEN
A1 JAN ERIK PAULSEN
A1 JAN ALEXANDER
YR 2004
UL http://ar.iiarjournals.org/content/24/5A/2595.abstract
AB C57BL/6J Min/+ mice, which carry a nonsense mutation in Apc, were injected twice neonatally with 5 mg azoxymethane (AOM) /kg body weight. AOM treatment in comparison with untreated Min mice increased the incidence and number of colonic tumours from 6/14 to 22/24 (incidence) and 0.64±0.9 to 4.0±3.5 tumours per mice, respectively. Colonic tumours were analysed for loss of heterozygosity (LOH) in Apc, and 32 of the samples showed LOH whereas 14 did not. In untreated Min mice, all 8 tumours had LOH in Apc. All tumour samples from the AOM-treated Min mice were analysed for nonsense mutations between codons 686 and 1217 in the Apc gene, and one sample had a G→ A transition mutation in codon 1047. No β-catenin mutations in the region coding for phosphorylation sites important for degradation were found. In conclusion, the main mechanism for colonic tumour induction in AOM-induced Min mice is LOH in Apc, but Apc nonsense mutations may also occur. Copyright© 2004 International Institute of Anticancer Research (Dr. John G. Delinassios), All rights reserved