TABLE 3

Potency values from a cAMP formation assay in C6 cells expressing hH3R(445) or hH3R(365)

Potencies are expressed as mean pEC50 ± S.E.M. (n = 2-7). (R)-α-Methylhistamine, α = 1 and ABT-239, α = -1 by definition.


No.

Compound

hH3R(445)

hH3R(365)
pEC50
α
pEC50
α
1 FUB322 4.2 ± 0.3 1.2 ± 0.2 6.7 ± 0.2 1.1 ± 0.04
2 GT-2331 7.2 ± 0.3 0.76 ± 0.1 8.2 ± 0.3 1.0 ± 0.1
3 Histamine 7.4 ± 0.2 1.0 ± 0.02 9.5 ± 0.1 1.0 ± 0.1
7 Immepip 9.0 ± 0.1 0.87 ± 0.1 9.9 ± 0.2 0.92 ± 0.1
10 Nα-Methylhistamine 8.5 ± 0.1 1.1 ± 0.01 9.7 ± 0.3 1.0 ± 0.2
12 (R)-α-Methylhistamine 8.2 ± 0.1 1.0 ± 0.03 9.8 ± 0.2 1.0 ± 0.1
13 (S)-α-Methylhistamine 6.8 ± 0.1 1.1 ± 0.0 8.3 ± 0.3 1.0 ± 0.2
19 A-349821 9.0 ± 0.4 -1.0 ± 0.1 8.1 ± 0.2 -1.0 ± 0.2
20 A-358239 8.5 ± 0.3 -0.90 ± 0.1 7.3 ± 0.3 -1.1 ± 0.1
25 Iodophenpropit 8.5 ± 0.4 -0.77 ± 0.05 7.8 ± 0.4 -0.50 ± 0.1
27
Thioperamide
7.6 ± 0.2
-0.83 ± 0.1
6.8 ± 0.3
-0.71 ± 0.05