title: Expression of aquaporin 5 and the AQP5 polymorphism A(-1364)C in association with peritumoral brain edema in meningioma patients.
abstract: Aquaporins (AQP) are a growing family of water-channel proteins, numbering 13 to date. Recent studies have reported AQP1 and AQP4 to be involved in the development and resorption of brain edemas of different origin. Other AQPs have also been detected in brain tissue, but their impact on brain edema remains to be shown. To evaluate a possible role of AQP5 in brain edema, we investigated the association of AQP5 expression and the functional AQP5 promoter polymorphism A(-1364)C with occurrence and intensity of peritumoral edema in meningioma patients. Peritumoral edema was classified in three degrees based on preoperative imaging in 89 meningioma patients treated at the University Hospital Essen between 2003 and 2006. AQP5 expression was assessed immunohistochemically in tumor tissue obtained during neurosurgical tumor resection. Genotypes of the A(-1364)C polymorphism were determined using the "slowdown" polymerase chain reaction. Higher levels of AQP5 expression were significantly correlated with the AQP5-1364 AA genotype (P = 0.02). AQP5 expression was positively correlated with edema (P = 0.04). AQP5 genotypes were not significantly associated with the occurrence, but with the intensity of peritumoral brain edema (P = 0.04). In our cohort, 40 % of patients with grade I, 66.7 % with grade II, and 76.5 % with grade III edema possessed at least one A allele. Development and intensity of peritumoral edema in meningiomas are associated with AQP5 expression. The intensity of edema correlates with the AQP5 A(-1364)C genotype. This suggests AQP5 as an interesting new candidate involved in peritumoral brain edema in meningioma patients.
authors: Department of Neurosurgery, Westdeutsches Tumorzentrum WTZ, University Hospital Essen, Hufelandstr. 55, 45147, Essen, Germany. nicole.lambertz@uk-essen.de
authors: Nicole
authors: N
authors: Lambertz
authors: Nicolai El
authors: NE
authors: Hindy
authors: Cordula
authors: C
authors: Adler
authors: Katharina
authors: K
authors: Rump
authors: Michael
authors: M
authors: Adamzik
authors: Kathy
authors: K
authors: Keyvani
authors: Agnes
authors: A
authors: Bankfalvi
authors: Winfried
authors: W
authors: Siffert
authors: I
authors: I
authors: Erol Sandalcioglu
authors: Hagen S
authors: HS
authors: Bachmann
mesh_terms: D051402:Aquaporin 5 / Q000235:genetics* / Q000378:metabolism*; D001929:Brain Edema / Q000209:etiology* / Q000473:pathology; D015331:Cohort Studies; D004273:DNA, Neoplasm / Q000235:genetics; D024202:Electrophoretic Mobility Shift Assay; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007124:Immunoenzyme Techniques; D008297:Male; D008577:Meningeal Neoplasms / Q000150:complications / Q000235:genetics* / Q000473:pathology; D008875:Middle Aged; D060787:Neoplasm Grading; D011110:Polymorphism, Genetic / Q000235:genetics*; D011379:Prognosis; D060888:Real-Time Polymerase Chain Reaction
chemical_list: C496036:AQP5 protein, human; D051402:Aquaporin 5; D004273:DNA, Neoplasm
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