Heterogeneous microsatellite instability observed within epithelium of ulcerative colitis
Kazuhide Ozaki
Department of Gastroenterological Surgery and Surgical Oncology, Okayama University Graduate School of Medicine and Dentistry, Okayama, Japan
Search for more papers by this authorTakeshi Nagasaka
Department of Gastroenterological Surgery and Surgical Oncology, Okayama University Graduate School of Medicine and Dentistry, Okayama, Japan
Search for more papers by this authorKenji Notohara
Department of Pathological Research, Okayama University Graduate School of Medicine and Dentistry, Okayama, Japan
Search for more papers by this authorTakeshi Kambara
Department of Gastroenterological Surgery and Surgical Oncology, Okayama University Graduate School of Medicine and Dentistry, Okayama, Japan
Search for more papers by this authorMasanori Takeda
Department of Gastroenterological Surgery and Surgical Oncology, Okayama University Graduate School of Medicine and Dentistry, Okayama, Japan
Search for more papers by this authorHiromi Sasamoto
Department of Gastroenterological Surgery and Surgical Oncology, Okayama University Graduate School of Medicine and Dentistry, Okayama, Japan
Search for more papers by this authorJeremy R. Jass
Department of Pathology, McGill University, Montreal, QC, Canada
Search for more papers by this authorNoriaki Tanaka
Department of Gastroenterological Surgery and Surgical Oncology, Okayama University Graduate School of Medicine and Dentistry, Okayama, Japan
Search for more papers by this authorCorresponding Author
Nagahide Matsubara
Department of Gastroenterological Surgery and Surgical Oncology, Okayama University Graduate School of Medicine and Dentistry, Okayama, Japan
Fax: +81-86-221-8775
Department of Gastroenterological Surgery and Surgical Oncology, Okayama University Graduate School of Medicine and Dentistry, 2-5-1 Shikata-cho, Okayama 700 8558, JapanSearch for more papers by this authorKazuhide Ozaki
Department of Gastroenterological Surgery and Surgical Oncology, Okayama University Graduate School of Medicine and Dentistry, Okayama, Japan
Search for more papers by this authorTakeshi Nagasaka
Department of Gastroenterological Surgery and Surgical Oncology, Okayama University Graduate School of Medicine and Dentistry, Okayama, Japan
Search for more papers by this authorKenji Notohara
Department of Pathological Research, Okayama University Graduate School of Medicine and Dentistry, Okayama, Japan
Search for more papers by this authorTakeshi Kambara
Department of Gastroenterological Surgery and Surgical Oncology, Okayama University Graduate School of Medicine and Dentistry, Okayama, Japan
Search for more papers by this authorMasanori Takeda
Department of Gastroenterological Surgery and Surgical Oncology, Okayama University Graduate School of Medicine and Dentistry, Okayama, Japan
Search for more papers by this authorHiromi Sasamoto
Department of Gastroenterological Surgery and Surgical Oncology, Okayama University Graduate School of Medicine and Dentistry, Okayama, Japan
Search for more papers by this authorJeremy R. Jass
Department of Pathology, McGill University, Montreal, QC, Canada
Search for more papers by this authorNoriaki Tanaka
Department of Gastroenterological Surgery and Surgical Oncology, Okayama University Graduate School of Medicine and Dentistry, Okayama, Japan
Search for more papers by this authorCorresponding Author
Nagahide Matsubara
Department of Gastroenterological Surgery and Surgical Oncology, Okayama University Graduate School of Medicine and Dentistry, Okayama, Japan
Fax: +81-86-221-8775
Department of Gastroenterological Surgery and Surgical Oncology, Okayama University Graduate School of Medicine and Dentistry, 2-5-1 Shikata-cho, Okayama 700 8558, JapanSearch for more papers by this authorAbstract
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. © 2006 Wiley-Liss, Inc.
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