Heterogeneous microsatellite instability observed within epithelium of ulcerative colitis

Kazuhide Ozaki, Takeshi Nagasaka, Kenji Notohara, Takeshi Kambara, Masanori Takeda, Hiromi Sasamoto, Jeremy R. Jass, Noriaki Tanaka, Nagahide Matsubara

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


Microsatellite instability (MSI) has been associated with colitic cancer. However, reported frequency of MSI was varied and the association of MSI with mismatch repair (MMR) deficiency was unclear. In addition, the occurrence of genetic alterations in stromal cells within ulcerative colitis (UC) is still controversial. We therefore sampled 164 microareas in various pathological lesions of UC with or without colitic cancer and studied the MSI status in relation to the DNA repair protein expressions. A total of 129 microfoci from colorectal tissue of 5 colitic cancer patients and 35 microfoci of 7 UC patients (without neoplasm) were carefully sampled by laser-capture microdissection. MSI was analyzed in each microsamples. The protein expression of MMR genes (MLH1, MSH2, MSH6), O6-methylguanine-DNA methyltransferase and p53 were assessed by immunohistochemical analysis. Variety of di-nulcleotide microsatellite markers was altered in individual microfoci from different morphological epithelial lesions, in full range of nonneoplastic epithelium to colitic cancer. Interestingly, MSI was not observed in stromal cells at any sites, including those within colitic cancer/dysplasia lesions. Expression of the MMR proteins was not lost in any of the lesions examined. Microsatellite alterations rather seem to be related to the initiation than to the progression of colitic cancer.

Original languageEnglish
Pages (from-to)2513-2519
Number of pages7
JournalInternational Journal of Cancer
Issue number11
Publication statusPublished - Dec 1 2006
Externally publishedYes


  • Colitic cancer
  • Microsatellite instability
  • Mismatch repair
  • Stroma
  • Ulcerative colitis

ASJC Scopus subject areas

  • Oncology
  • Cancer Research


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