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Related Experiment Video

Updated: Feb 1, 2026

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Age-Related Changes in Ang II Receptor Localization and Expression in the Developing Auditory Pathway.

M E Arce1, S I Sánchez1, M M Correa1

  • 1Instituto Multidisciplinario de Investigaciones Biológicas (IMIBIO-SL CONICET), Universidad Nacional de San Luis, Ejército de los Andes 950, 5700, San Luis, Argentina.

Neurochemical Research
|November 30, 2018
PubMed
Summary

This study reveals that Angiotensin II (Ang II) AT2 receptors are highly expressed in the developing auditory system, correlating with auditory pathway maturation. Prenatal Ang II or AT2 antagonist treatments altered AT2 receptor levels in the inferior colliculus.

Keywords:
AT2 receptorsBrain developmentCochlear nucleusInferior colliculusSuperior olivary complex

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Auditory System Research

Background:

  • The role of Angiotensin II (Ang II) receptors in the developing auditory system remains largely unexplored.
  • Understanding receptor localization is crucial for deciphering auditory pathway development and function.

Purpose of the Study:

  • To investigate the developmental expression and localization of Ang II AT1 and AT2 receptors in the auditory system.
  • To examine the impact of prenatal Ang II or AT2 antagonist administration on these receptors.

Main Methods:

  • Binding autoradiography was employed to map Ang II receptor distribution across different ages (P0, P8, P15, P30).
  • In situ hybridization and immunofluorescence confirmed AT2 receptor localization and neuronal expression.
  • Effects of prenatal treatments with Ang II or PD123319 (AT2 antagonist) were assessed.

Main Results:

  • High Ang II AT2 receptor binding was observed in the inferior colliculus (IC) throughout development, peaking at postnatal day 15 (P15).
  • AT2 receptors were also found in the ventral cochlear nucleus and superior olivary complex, with specific developmental expression patterns.
  • Prenatal Ang II or AT2 antagonist treatment significantly increased AT2 receptor levels in the IC at early ages (P0, P8).

Conclusions:

  • The developmental expression of Ang II AT2 receptors in the auditory system correlates with the onset of hearing and auditory circuit formation.
  • These findings suggest a significant role for Ang II signaling, particularly via AT2 receptors, in auditory pathway development.