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(Hypertension. 1996;28:818-824.)
© 1996 American Heart Association, Inc.

Articles

Subcellular Localization of Angiotensin II Immunoreactivity in the Rat Cerebellar Cortex

Bettina Erdmann; Kjell Fuxe; Detlev Ganten

the Max-Delbruck-Center for Molecular Medicine, Berlin-Buch, Germany (B.E., D.G.), and the Karolinska Institute, Department of Neuroscience, Division of Cellular and Molecular Neurochemistry, Stockholm, Sweden (K.F.).

Correspondence to B. Erdmann, Max-Delbruck-Center for Molecular Medicine, Electron Microscopy, Robert-Rossle-Str. 10, D-13122 Berlin-Buch, FRG. E-mail berdma@orion.rz.mdc-berlin.de.

We localized angiotensin II (Ang II) immunoreactivity in the rat cerebellar cortex with immunogold staining methods. Perfusion fixation with high amounts of glutaraldehyde and the use of cryoultramicrotomy caused remarkable changes in immunostaining versus formaldehyde/picric acid fixation. With the use of monoclonal and polyclonal anti–Ang II, Ang II immunoreactivity was prominent in cerebellar neurons such as Purkinje, granule, basket, and stellate cells. At the subcellular level, the peptide was clearly localized in nuclei, and in some cell types, such as endothelial and granule cells, it was nearly exclusively present in the transcriptionally active euchromatin. Intracellular Ang II immunoreactivity was also detected in vesicle-like structures in cytoplasm and mitochondria and at cell-cell contacts. Additional experiments with liver and adrenal tissue confirmed the nuclear localization of Ang II immunoreactivity, suggesting a role of Ang II in the regulation of gene transcription.

Key Words: angiotensin II • cerebellum • microscopy, electron • gold colloid • cell nucleus

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