title: Pancreas-specific aquaporin 12 null mice showed increased susceptibility to caerulein-induced acute pancreatitis.
abstract: Aquaporin 12 (AQP12) is the most recently identified member of the mammalian AQP family and is specifically expressed in pancreatic acinar cells. In vitro expression studies have revealed that AQP12 is localized at intracellular sites. To determine the physiological roles of AQP12 in the pancreas, we generated knockout mice for this gene (AQP12-KO). No obvious differences were observed under normal conditions between wild-type (WT) and AQP12-KO mice in terms of growth, blood chemistry, pancreatic fluid content, or histology. However, when we induced pancreatitis through the administration of a cholecystokinin-8 (CCK-8) analog, the AQP12-KO mice showed more severe pathological damage to this organ than WT mice. Furthermore, when we analyzed exocytosis in the pancreatic acini using a two-photon excitation imaging method, the results revealed larger exocytotic vesicles (vacuoles) in the acini of AQP12-KO mice at a high CCK-8 dose (100 nM). From these results, we conclude that AQP12 may function in the mechanisms that control the proper secretion of pancreatic fluid following rapid and intense stimulation.
authors.affiliation: Dept. of Nephrology, Tokyo Medical and Dental Univ., Japan.
authors.forename: Eriko
authors.initials: E
authors.lastname: Ohta
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Itoh
authors.forename: Tomomi
authors.initials: T
authors.lastname: Nemoto
authors.forename: Jiro
authors.initials: J
authors.lastname: Kumagai
authors.forename: Shigeru B H
authors.initials: SB
authors.lastname: Ko
authors.forename: Kenichi
authors.initials: K
authors.lastname: Ishibashi
authors.forename: Mayuko
authors.initials: M
authors.lastname: Ohno
authors.forename: Keiko
authors.initials: K
authors.lastname: Uchida
authors.forename: Akihito
authors.initials: A
authors.lastname: Ohta
authors.forename: Eisei
authors.initials: E
authors.lastname: Sohara
authors.forename: Shinichi
authors.initials: S
authors.lastname: Uchida
authors.forename: Sei
authors.initials: S
authors.lastname: Sasaki
authors.forename: Tatemitsu
authors.initials: T
authors.lastname: Rai
mesh_terms: D000208:Acute Disease; D000681:Amylases / Q000378:metabolism; D000818:Animals; D020346:Aquaporins / Q000172:deficiency*; D002108:Ceruletide; D002766:Cholecystokinin; D004032:Diet; D004198:Disease Susceptibility / Q000378:metabolism; D004721:Endoplasmic Reticulum / Q000378:metabolism; D005089:Exocytosis; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D010179:Pancreas / Q000201:enzymology / Q000378:metabolism; D046790:Pancreas, Exocrine / Q000378:metabolism* / Q000473:pathology / Q000503:physiopathology; D010195:Pancreatitis / Q000139:chemically induced* / Q000473:pathology / Q000503:physiopathology; D010446:Peptide Fragments; D010539:Permeability; D017785:Photons; D014018:Tissue Distribution; D014867:Water / Q000378:metabolism
chemical_list: C501068:AQP12 protein, mouse; D020346:Aquaporins; D010446:Peptide Fragments; C410885:cholecystokinin 8; D014867:Water; D002108:Ceruletide; D002766:Cholecystokinin; D000681:Amylases