Organic anion transporter 3 contributes to the regulation of blood pressure.
Renal organic anion transporters (OAT) are known to mediate the excretion of many drugs, but their function in normal physiology is not well understood. In this study, mice lacking organic anion transporter 3 (Oat3) had a 10 to 15% lower BP than wild-type mice, raising the possibility that Oat3 transports an endogenous regulator of BP. The aldosterone response to a low-salt diet was blunted in Oat3-null mice, but baseline aldosterone concentration was higher in these mice, suggesting that aldosterone dysregulation does not fully explain the lower BP in the basal state; therefore, both targeted and global metabolomic analyses of plasma and urine were performed, and several potential endogenous substrates of Oat3 were found to accumulate in the plasma of Oat3-null mice. One of these substrates, thymidine, was transported by Oat3 expressed in vitro. In vivo, thymidine, as well as two of the most potent Oat3 inhibitors that were characterized, reduced BP by 10 to 15%; therefore, Oat3 seems to regulate BP, and Oat3 inhibitors might be therapeutically useful antihypertensive agents. Moreover, polymorphisms in human OAT3 might contribute to the genetic variation in susceptibility to hypertension.
Vallon
Volker
V
Division of Nephrology and Hypertension, Department of Medicine, University of California San Diego and VASDHCS, 3350 La Jolla Village Drive (9151), San Diego, CA 92161, USA. vvallon@ucsd.edu
Eraly
Satish A
SA
Wikoff
William R
WR
Rieg
Timo
T
Kaler
Gregory
G
Truong
David M
DM
Ahn
Sun-Young
SY
Mahapatra
Nitish R
NR
Mahata
Sushil K
SK
Gangoiti
Jon A
JA
Wu
Wei
W
Barshop
Bruce A
BA
Siuzdak
Gary
G
Nigam
Sanjay K
SK
D000324:Adrenocorticotropic Hormone / Q000097:blood; D000450:Aldosterone / Q000097:blood; D000818:Animals; D001794:Blood Pressure; D003345:Corticosterone / Q000097:blood; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D009865:Oocytes / Q000378:metabolism; D029362:Organic Anion Transporters, Sodium-Independent / Q000037:antagonists & inhibitors / Q000378:metabolism*; D012083:Renin / Q000097:blood; D014981:Xenopus
D029362:Organic Anion Transporters, Sodium-Independent; C114338:organic anion transport protein 3; D000450:Aldosterone; D000324:Adrenocorticotropic Hormone; D012083:Renin; D003345:Corticosterone