GJD2 and familial hypercholesterolemia: We first evaluated the impact of prolonged hypercholesterolemia on Cx36 expression in vivo using the hypercholesterolemic, pro-atherogenic ApoE deficient mouse (ApoE−/−) [22], [23], [24] and observed that the Cx36 levels were decreased in ApoE−/− compared to WT mice.