Table 1.

Voltage-dependent activation parameters

Pre-treatmentPost-treatment
V1/2 (mV)nsnV1/2 (mV)nsnP value (V1/2)
Holo HCN4 
+ Vehicle −102.3 ± 2.0 8.9 ± 1.7 −104.1 ± 2.9 9.0 ± 0.69 0.64 
+1 µM CBD −102.5 ± 1.4 9.6 ± 0.64 −98.8 ± 1.8 10.3 ± 0.77 0.17 
+2.5 µM CBD −105.4 ± 2.5 9.8 ± 1.1 −95.0 ± 2.7 10.2 ± 0.72 0.022 
+5 µM CBD −102.1 ± 1.1 9.8 ± 0.55 −87.5 ± 3.0 9.8 ± 0.99 0.0002 
+10 µM CBD −98.2 ± 2.2 9.4 ± 1.3 −83.4 ± 1.5 11.3 ± 1.9 0.0005 
+20 µM CBD −102.7 ± 1.6 11 9.5 ± 0.8 11 −89.3 ± 2.1 11 10.2 ± 0.69 11 <0.0001 
+10 µM diC8-PIP2; +5 µM CBD     −76.5 ± 3.4 7.9 ± 0.75 n/a 
Apo HCN4 
+5 µM CBD −113.2 ± 2.2 13.5 ± 1.5 −97.6 ± 2.5 8.7 ± 0.79 0.0005 
Pre-treatmentPost-treatment
V1/2 (mV)nsnV1/2 (mV)nsnP value (V1/2)
Holo HCN4 
+ Vehicle −102.3 ± 2.0 8.9 ± 1.7 −104.1 ± 2.9 9.0 ± 0.69 0.64 
+1 µM CBD −102.5 ± 1.4 9.6 ± 0.64 −98.8 ± 1.8 10.3 ± 0.77 0.17 
+2.5 µM CBD −105.4 ± 2.5 9.8 ± 1.1 −95.0 ± 2.7 10.2 ± 0.72 0.022 
+5 µM CBD −102.1 ± 1.1 9.8 ± 0.55 −87.5 ± 3.0 9.8 ± 0.99 0.0002 
+10 µM CBD −98.2 ± 2.2 9.4 ± 1.3 −83.4 ± 1.5 11.3 ± 1.9 0.0005 
+20 µM CBD −102.7 ± 1.6 11 9.5 ± 0.8 11 −89.3 ± 2.1 11 10.2 ± 0.69 11 <0.0001 
+10 µM diC8-PIP2; +5 µM CBD     −76.5 ± 3.4 7.9 ± 0.75 n/a 
Apo HCN4 
+5 µM CBD −113.2 ± 2.2 13.5 ± 1.5 −97.6 ± 2.5 8.7 ± 0.79 0.0005 

Average ± S.E.M. for V1/2 and slope values calculated from the Boltzmann function. P value given from paired t test performed for each paired condition (i.e., CBD concentration or vehicle).

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