Table 2.

Properties of INa determined in Xenopus oocytes expressing NaV1.5 alone or in combination with iFGF12B or iFGF13VYa

NaV1.5NaV1.5 + iFGF12BNaV1.5 + iFGF13VY
G-V activation (n(5) (6) (6) 
V1/2, act (mV) −37.0 ± 0.6 −26.2 ± 2.2 −32.3 ± 3.1 
P valueb  0.006 (**) 0.33 
kact 6.1 ± 0.3 6.6 ± 0.4 5.5 ± 0.5 
P valueb  0.44 0.60 
G-V inactivation (n(9) (7) (6) 
V1/2, inact (mV) −69.0 ± 0.5 −60.9 ± 0.4 −54.5 ± 1.8 
P valueb  <0.001 (***) <0.001 (***) 
kinact 5.8 ± 0.3 4.9 ± 0.3 4.7 ± 0.4 
P valueb  0.06 0.09 
Inactivation recovery (n(8) (5) (5) 
ƬR,1 (ms) 2.5 ± 0.2 1.9 ± 0.3 1.3 ± 0.1 
P valueb  0.04 (*) <0.001 (***) 
ƬR,2 (ms)c 15.8 ± 1.4 12.5 ± 1.3 8.5 ± 1.3 
NaV1.5NaV1.5 + iFGF12BNaV1.5 + iFGF13VY
G-V activation (n(5) (6) (6) 
V1/2, act (mV) −37.0 ± 0.6 −26.2 ± 2.2 −32.3 ± 3.1 
P valueb  0.006 (**) 0.33 
kact 6.1 ± 0.3 6.6 ± 0.4 5.5 ± 0.5 
P valueb  0.44 0.60 
G-V inactivation (n(9) (7) (6) 
V1/2, inact (mV) −69.0 ± 0.5 −60.9 ± 0.4 −54.5 ± 1.8 
P valueb  <0.001 (***) <0.001 (***) 
kinact 5.8 ± 0.3 4.9 ± 0.3 4.7 ± 0.4 
P valueb  0.06 0.09 
Inactivation recovery (n(8) (5) (5) 
ƬR,1 (ms) 2.5 ± 0.2 1.9 ± 0.3 1.3 ± 0.1 
P valueb  0.04 (*) <0.001 (***) 
ƬR,2 (ms)c 15.8 ± 1.4 12.5 ± 1.3 8.5 ± 1.3 
a

Values are means ± SEM; n = number of biological replicates (cells).

b

P values are obtained from a comparison to recordings from oocytes expressing NaV1.5 alone (see Materials and methods). Significant differences are designated as *, **, and *** for P values <0.05, 0.01, and 0.001, respectively.

c

Recovery time constant for the slower component contributes very little. A comparison is thus omitted.

or Create an Account

Close Modal
Close Modal