Angiotensin AT1 receptor signalling pathways in neurons

Area of Science:

• Neuroscience
• Molecular Biology
• Pharmacology

Background:

• Angiotensin II (Ang II) is a peptide hormone that plays a crucial role in regulating cardiovascular function.
• AT1 receptors are known to activate diverse signaling pathways in peripheral tissues like the kidney, heart, and vascular smooth muscle.
• Neuronal AT1 receptors also exhibit a wide range of signaling mechanisms, influencing neuronal function.

Purpose of the Study:

• To review the intracellular signal transduction pathways influenced by angiotensin II (Ang II) acting via its type 1 (AT1) receptor in neurons.
• To outline the known neuronal AT1 receptor signaling pathways and their functional relevance.
• To discuss novel AT1 receptor signaling pathways identified through gene expression profiling.

Main Methods:

• Literature review of intracellular signal transduction pathways.
• Analysis of AT1 receptor coupling mechanisms in neurons.
• Discussion of gene expression profiling data for novel pathway discovery.

Main Results:

• AT1 receptor activation in neurons influences diverse signaling pathways.
• Pathways mediating short-term changes in neuronal membrane ionic currents and firing rate were reviewed.
• Pathways mediating long-term changes in enzyme activity, gene expression, and noradrenaline synthesis were discussed.

Conclusions:

• Neuronal AT1 receptor signaling is complex and multifaceted.
• Understanding these pathways is crucial for elucidating Ang II's role in neuronal function.
• Novel pathways identified through gene expression profiling offer new insights into AT1 receptor signaling in neurons.