Angiotensin AT1/AT2 receptors: regulation, signalling and function

Area of Science:

• Cardiovascular Physiology
• Renal Physiology
• Molecular Biology

Background:

• The renin-angiotensin system (RAS) is crucial for regulating blood pressure and fluid balance.
• Angiotensin II (Ang II) is the primary active peptide of the RAS, acting via specific receptors.
• Two main receptor subtypes, AT1 and AT2, mediate Ang II's diverse actions.

Purpose of the Study:

• To review the regulation, signaling, and physiological functions of AT1 and AT2 receptors.
• To highlight the distinct roles of AT1 and AT2 receptors in cardiovascular, brain, and renal systems.
• To summarize recent findings on the involvement of these receptors in various biological processes.

Main Methods:

• Literature review of existing research on Angiotensin II receptors.
• Synthesis of data on receptor subtypes, their signaling pathways, and physiological roles.
• Analysis of the involvement of AT1 and AT2 receptors in both normal function and disease states.

Main Results:

• AT1 receptor mediates classic Ang II effects: vasoconstriction, aldosterone release, sodium/water retention, and sympathetic facilitation.
• AT1 receptor is implicated in pathological conditions: cell proliferation, hypertrophy, nephrosclerosis, and athero-thrombosis.
• AT2 receptor plays a role in cardiovascular, brain, and renal functions, as well as development, tissue repair, and apoptosis.

Conclusions:

• AT1 and AT2 receptors exhibit distinct and complementary roles in the renin-angiotensin system.
• Understanding these receptors is vital for comprehending cardiovascular and renal physiology and pathophysiology.
• Further research into AT1 and AT2 receptor signaling offers therapeutic potential.