The angiotensin II type 2 receptor: an enigma with multiple variations

Area of Science:

• Pharmacology
• Physiology
• Molecular Biology

Background:

• The angiotensin II (ANG II) type 2 (AT(2)) receptor has been recognized for a decade.
• It binds ANG II with high affinity but does not mediate classical ANG II actions, which are mediated by the AT(1) receptor.
• The AT(2) receptor displays distinct biochemical, functional, and expression patterns compared to the AT(1) receptor.

Purpose of the Study:

• To review advances in understanding the biology of the AT(2) receptor.
• To discuss how new discoveries and experimental approaches may elucidate the functions of AT(2) receptors.
• To address the enigma surrounding the AT(2) receptor's physiological and pathophysiological roles.

Main Methods:

• Literature review of studies on AT(2) receptor biology.
• Analysis of research findings on AT(2) receptor expression and function.
• Consideration of novel experimental strategies for future research.

Main Results:

• Significant information has been gathered on the AT(2) receptor over the past decade.
• Studies suggest potential roles in brain, renal, cardiovascular functions, apoptosis, and tissue regeneration.
• Despite progress, a singular, defining function for AT(2) receptors remains elusive.

Conclusions:

• The study of AT(2) receptors is at a critical juncture, requiring innovative approaches.
• Further research is needed to establish unifying mechanisms for AT(2) receptor function.
• Elucidating the elusive physiological and pathophysiological roles of AT(2) receptors is a key future direction.