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The angiotensin II type 2 receptor: an enigma with multiple variations Gallinat S; Busche S; Raizada MK; Sumners CAm J Physiol Endocrinol Metab 2000[Mar]; 278 (3): E357-74Since it was discovered ten years ago, the angiotensin II (ANG II) type 2 (AT(2)) receptor has been an enigma. This receptor binds ANG II with a high affinity but is not responsible for mediating any of the classical physiological actions of this peptide, all of which involve the ANG II type 1 (AT(1)) receptor. Furthermore, the AT(2) receptor exhibits dramatic differences in biochemical and functional properties and in patterns of expression compared with the AT(1) receptor. During the past decade, much information has been gathered about the AT(2) receptor, and the steadily increasing number of publications indicates a growing interest in this new and independent area of research. A number of studies suggest a role of AT(2) receptors in brain, renal, and cardiovascular functions and in the processes of apoptosis and tissue regeneration. Despite these advances, nothing stands out as the major singular function of these receptors. The study of AT(2) receptors has reached a crossroads, and innovative approaches must be considered so that unifying mechanisms as to the function of these unique receptors can be put forward. In this review we will discuss the advances that have been made in understanding the biology of the AT(2) receptor. Furthermore, we will consider how these discoveries, along with newer experimental approaches, may eventually lead to the elusive physiological and pathophysiological functions of these receptors.|Animals[MESH]|Apoptosis/physiology[MESH]|Humans[MESH]|Receptor, Angiotensin, Type 2[MESH]|Receptors, Angiotensin/metabolism/*physiology[MESH]|Regeneration/physiology[MESH]|Signal Transduction[MESH] |
