Transporter Herbal compound Substrate/ Inhibitor IC50
(μM)
Ki
(μM)
Km
(μM)
Reference
OAT1 Baicalein Inhibitor 11.8 ± 6.2 ND ND [33]
  Wogonin Inhibitor 5.4 ± 2.8 ND ND [33]
  Rosmarinic acid Inhibitor ND 0.35 ± 0.06 ND [36]
  Aristololchic acids (AA-I) Inhibitor 0.44 ± 0.08 0.08 ± 0.15 ND [42]
  Aristolochic acids (AA-II) Inhibitor 1.06 ± 0.09 ND ND [42]
  Rhein Inhibitor 0.0771 ± 0.0055 0.0715 ± 0.0052 ND [36]
  Gallic acid Inhibitor 1.24 ± 0.36 1.08 ± 0.26 ND [37]
  3-monoglucuronyl-glycyrrhetinic acid Substrate ND ND 50.9 [43]
OAT3 Ursolic acid Inhibitor 18.9 ± 8.20 ND ND [19]
  Baicalin Inhibitor 13.0 ± 5.1 ND ND [33]
  Baicalein Inhibitor 2.4 ± 1.3 ND ND [33]
  Wogonin Inhibitor 1.3 ± 0.3 ND ND [33]
  Rosmarinic acid Inhibitor ND 0.55 ± 0.25 ND [36]
  Lithospermic acid Inhibitor ND 0.59 ± 0.26 ND [36]
  Salvianolic acid A Inhibitor ND 0.16 ± 0.03 ND [36]
  Aristololchic acids (AA-I) Inhibitor 0.65 ± 0.08 0.84 ± 0.10 ND [42]
  Aristolochic acids (AA-II) Inhibitor 1.28 ± 0.18 ND ND [42]
  Rhein Inhibitor 0.0084 ± 0.0025 0.0077 ± 0.0074 ND [36]
  Gallic acid Inhibitor 9.02 ± 3.24 8.44 ± 3.03 ND [37]
  3-monoglucuronyl-glycyrrhetinic acid Substrate ND ND 21.3 [43]
OAT4 Baicalin Inhibitor 15.6 ± 5.50 ND ND [33]
ND: Not determined.
Table 2: The interactions of herbal compounds with human OATs.