Chapter

Brain Edema XII

Volume 86 of the series Acta Neurochirurgica Supplements pp 495-498

Aquaporin 1 and aquaporin 4 expression in human brain after subarachnoid hemorrhage and in peritumoral tissue

  • J. BadautAffiliated withMedical Research Institute, Tokyo Medical and Dental UniversityDepartment of Neurosurgery, Centre Hospitalier Universitaire VaudoisInstitut of Physiology, University of Lausanne
  • , J. F. BrunetAffiliated withMedical Research Institute, Tokyo Medical and Dental UniversityDepartment of Neurosurgery, Centre Hospitalier Universitaire VaudoisInstitut of Physiology, University of Lausanne
  • , L. GrollimundAffiliated withMedical Research Institute, Tokyo Medical and Dental UniversityDepartment of Neurosurgery, Centre Hospitalier Universitaire VaudoisInstitut of Physiology, University of Lausanne
  • , M. F. HamouAffiliated withMedical Research Institute, Tokyo Medical and Dental UniversityDepartment of Neurosurgery, Centre Hospitalier Universitaire Vaudois
  • , P. J. MagistrettiAffiliated withMedical Research Institute, Tokyo Medical and Dental UniversityInstitut of Physiology, University of Lausanne
  • , J. G. VillemureAffiliated withMedical Research Institute, Tokyo Medical and Dental UniversityDepartment of Neurosurgery, Centre Hospitalier Universitaire Vaudois
  • , Luca RegliAffiliated withMedical Research Institute, Tokyo Medical and Dental UniversityDepartment of Neurosurgery, Centre Hospitalier Universitaire Vaudois

* Final gross prices may vary according to local VAT.

Get Access

Abstract

Aquaporins (AQPs) are a protein family of water channels which facilitate the water flux through the plasmatic membranes. The expression of AQPs has been described in rat brain by several studies. Despite recent reports that have shown an over-expression of AQP1 and 4 in human tumoral cells, little is known about AQP expression in human brain. The purpose of this study was to investigate the expression of AQP1 and AQP4 in human brain after subarachnoid hemorrhage (SAH) and in peritumoral tissue by western blot and immunohistochemistry.

The results showed a marked increase of the expression of AQP1 and AQP4. This over-expression occurred on the astrocytic processes and polarization on astrocytic end-feet was lost. No expression was observed on neuronal cells.

This study is the first demonstration of the induction of AQP1 and AQP4 on reactive astrocytes in an acute brain injury, such as SAH. These results reinforce the hypothesis that AQPs may be involved in the dynamics of brain edema formation or resolution. Further studies are needed to understand their functional role.

Keywords

Aquaporins brain astrocyte subarachnoid hemorrhage human