Angiotensin II-induced nuclear targeting of the angiotensin type 1 (AT1) receptor in brain neurons

Endocrinology
D LuM K Raizada

Abstract

Angiotensin II (Ang II) interaction with the neuronal AT1 receptor results in a chronic stimulation of neuromodulation that involves the expression of norepinephrine transporter (NET) and tyrosine hydroxylase (TH). In view of this unique property and the presence of putative nuclear localization signal (NLS) consensus sequence in the AT1 receptor, this study was conducted to investigate the hypothesis that Ang II would induce nuclear sequestration of this G protein-coupled receptor and that the sequestration may have implications on Ang II-induced expression of NET and TH genes. Incubation of neuronal cultures with Ang II caused a time- and dose-dependent increase in the levels of AT1 receptor immunoreactivity in the nucleus. A 6.7-fold increase was observed with 100 nM Ang II, in 15 min, that was blocked by losartan, an AT1 receptor-specific antagonist. Ang II-induced nuclear sequestration was specific for AT1 receptor, because Ang II failed to produce a similar effect on neuronal AT2 receptors. The presence of the putative NLS sequence in the cytoplasmic tail of the AT1 receptor seems to be the key in nuclear targeting because: 1) nuclear targeting was attenuated by a peptide of the AT1 receptor that contained the putative NL...Continue Reading

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