title: Expression and intracellular localization of matrix metalloproteinases in intraductal papillary mucinous neoplasms of the pancreas.
abstract: To analyze the expression of matrix metalloproteinases (MMPs) and their relationships with the histological grades of the intraductal papillary mucinous neoplasm (IPMN) of the pancreas, we examined the frequency of expression and intracellular localization of MMP1, MMP2, MMP3, MMP7, and MMP9 in IPMN by immunohistochemistry. A total of 45 IPMN lesions (14 adenomas, 17 borderline lesions, nine noninvasive carcinomas, and five invasive lesions) from 21 patients were examined. MMP1, MMP2, MMP7, and MMP9 were expressed in tumor cells. Frequency of tumor cells expressing MMP7 was low in adenomas (median, 5.0%), higher in borderline lesions (median, 30.0%), in noninvasive carcinomas (median, 50.0%), and in invasive lesions (median, 80.0%), with a significant trend (P < 0.0001). Such a trend was also observed when the lesions were classified into gastric and intestinal subtypes (P < 0.0001 and P = 0.011, respectively). Basolateral expression of MMP7 in tumor cells was more prominent in lesions with higher histological grades (P < 0.0001). The frequency and the localization of MMP1, MMP2, and MMP9 did not correlate to the histological grades. MMP7 may contribute to the process by which IPMN advances from adenoma to carcinoma and to subsequent invasion of tumor cells in IPMN.
authors.affiliation: Department of Human Pathology, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-ku, Tokyo, Japan.
authors.forename: Urara
authors.initials: U
authors.lastname: Tamahashi
authors.forename: Jiro
authors.initials: J
authors.lastname: Kumagai
authors.forename: Touichiro
authors.initials: T
authors.lastname: Takizawa
authors.forename: Masaki
authors.initials: M
authors.lastname: Sekine
authors.forename: Yoshinobu
authors.initials: Y
authors.lastname: Eishi
mesh_terms: D002288:Adenocarcinoma, Mucinous / Q000378:metabolism* / Q000473:pathology; D000236:Adenoma / Q000378:metabolism* / Q000473:pathology; D000368:Aged; D000369:Aged, 80 and over; D015820:Cadherins / Q000378:metabolism; D021441:Carcinoma, Pancreatic Ductal / Q000378:metabolism* / Q000473:pathology; D002291:Carcinoma, Papillary / Q000378:metabolism* / Q000473:pathology; D018450:Disease Progression; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D008297:Male; D020781:Matrix Metalloproteinase 1 / Q000378:metabolism; D020778:Matrix Metalloproteinase 2 / Q000378:metabolism; D020783:Matrix Metalloproteinase 7 / Q000378:metabolism; D020780:Matrix Metalloproteinase 9 / Q000378:metabolism; D020782:Matrix Metalloproteinases / Q000378:metabolism*; D008875:Middle Aged; D010190:Pancreatic Neoplasms / Q000378:metabolism* / Q000473:pathology
chemical_list: D015820:Cadherins; D020782:Matrix Metalloproteinases; D020783:Matrix Metalloproteinase 7; D020778:Matrix Metalloproteinase 2; D020780:Matrix Metalloproteinase 9; D020781:Matrix Metalloproteinase 1