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Methylation of Tumor Suppressor Genes in Autoimmune Pancreatitis
Yasuhiro Kinugawa1, Takeshi Uehara, Kenji Sano
1From the *Department of Laboratory Medicine, and †Department of Gastroenterology, Shinshu University School of Medicine; ‡Center for Health, Safety, and Environmental Management, Shinshu University; §Department of Pathology, Aizawa Hospital, Matsumoto; ∥Department of Pathology, Nagano Municipal Hospital, Nagano; ¶Department of Pathology, Saku Central Hospital, Saku; and #Department of Biomedical Laboratory Medicine, Shinshu University School of Medicine, Matsumoto, Japan.
Objectives:
Autoimmune pancreatitis (AIP) is a representative IgG4-related and inflammatory disease of unknown etiology. To clarify mechanisms of carcinogenesis resulting from AIP, we focused on methylation abnormalities and KRAS mutations in AIP.
Methods:
Six tumor suppressor genes (NPTX2, Cyclin D2, FOXE1, TFPI2, ppENK, and p16) that exhibited hypermethylation in pancreatic carcinoma were selected for quantitative SYBR green methylation-specific polymerase chain reaction in 10 AIP specimens, 10 pancreatic adenocarcinoma cases without history of AIP containing carcinoma areas (CAs) and noncarcinoma areas (NCAs), and 11 normal pancreas (NP) samples. KRAS mutation in codons 12, 13, and 61 were also investigated using direct sequencing.
Results:
Hypermethylation events (≥10%) were identified in NPTX2, Cyclin D2, FOXE1, TFPI2, ppENK, and p16 in 1, 2, 2, 0, 2, and 0 CA cases, respectively, but not in these 6 candidate genes in AIP, NCA, and NP. However, the TFPI2 methylation ratio was significantly higher in AIP than NCA and NP. Direct sequencing results for KRAS showed no single-point mutations in AIP.
Conclusions:
These are the first studies characterizing methylation abnormalities in AIP. AIP's inflammatory condition may be related to carcinogenesis. Further study will elucidate methylation abnormalities associated with carcinogenesis in AIP.
Insights
This study investigated methylation abnormalities and KRAS mutations in autoimmune pancreatitis (AIP). While KRAS mutations were absent, altered TFPI2 methylation in AIP suggests a link to pancreatic carcinogenesis.
Area of Science:
- Gastroenterology and Hepatology
- Oncology
- Molecular Biology
Background:
- Autoimmune pancreatitis (AIP) is an IgG4-related inflammatory condition with unknown causes of cancer development.
- Understanding the molecular mechanisms linking AIP to pancreatic cancer is crucial for early detection and prevention.
Purpose of the Study:
- To investigate methylation abnormalities in six tumor suppressor genes and KRAS mutations in autoimmune pancreatitis (AIP).
- To explore the potential role of these molecular alterations in the carcinogenesis associated with AIP.
Main Methods:
- Quantitative SYBR green methylation-specific PCR was used to analyze six selected tumor suppressor genes in AIP, pancreatic adenocarcinoma, and normal pancreas samples.
- Direct sequencing was employed to detect KRAS mutations in codons 12, 13, and 61.
Main Results:
- Hypermethylation was observed in NPTX2, Cyclin D2, FOXE1, and ppENK in pancreatic carcinoma cases, but not in AIP, non-carcinoma, or normal pancreas samples.
- A significantly higher TFPI2 methylation ratio was found in AIP compared to non-carcinoma and normal pancreas samples.
- No single-point KRAS mutations were detected in any of the AIP specimens.
Conclusions:
- This study provides the first characterization of methylation abnormalities in AIP.
- The inflammatory processes in AIP may be implicated in the development of pancreatic cancer.
- Further research is warranted to fully elucidate the methylation abnormalities associated with carcinogenesis in AIP.
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