Minoxidil sulfate, a potent and ATP-sensitive K+ channel opener, is the sulfated metabolite of minoxidil. Minoxidil sulfate is considered as a vasodilator to promote hair growth in vivo[1][3].

Minoxidil sulfate (1-100 μM; 2 hours) significantly reduces the permeability of bloode-brain tumor barrier (BTB) in a monolayer of RBMEC in a time-dependent manner, additionally,the effects of MS on transendothelial electrical resistance (TEER) is Transendothelial electrical resistance (TEER) at 2 h with high concentration[2].Minoxidil sulfate (0-100 μM; 0-4 hours) increases the RhoA activation in brain tumor tissue by 1 h and the highest level appears at 2 h, it also significantly induces transient PKB phosphorylation at Ser-473, without affecting total PKB levels. Addiotionally, LY294002 partly prevents the phosphorylation of PKB induced by MS[2]. Western Blot Analysis[2] Cell Line: Rat brain microvascular endothelial cells (RBMECs)

[1]. A E Buhl, et al. Minoxidil sulfate is the active metabolite that stimulates hair follicles. J Invest Dermatol. 1990 Nov;95(5):553-7. [2]. Yan-ting Gu, et al. Minoxidil sulfate induced the increase in blood-brain tumor barrier permeability through ROS/RhoA/PI3K/PKB signaling pathway.Neuropharmacology 2013 Dec;75:407-15.doi: 10.1016/j.neuropharm. [3]. Y Nakaya, et al.Effect of minoxidil sulfate and pinacidil on single potassium channel current in cultured human outer root sheath cells and dermal papilla cells. J Dermatol Sci. 1994 Jul;7 Suppl:S104-8.