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. 2009 Sep 1;284(43):29817–29827. doi: 10.1074/jbc.M109.050187

TABLE 2.

CP55,940-mediated inhibition of β−arrestin2 redistribution to GPR55

Log IC50 ± S.E. values were determined from concentration-effect curves. KI values were determined from IC50 values as described under “Experimental Procedures.”

Competitive agonist Log IC50 ± S.E. IC50 Calculated KI
m nm nm
LPI −6.17 ± 0.17 678 194
LPI (On-Cell)a −5.92 ± 0.15 1210 173
SR141716A −5.73 ± 0.15 1850 213
AM251 −5.56 ± 0.42 2750 542
a

Inhibition of LPI-mediated receptor internalization.