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Amiloride hydrochloride

CAS No. : 2016-88-8

MCE 站：Amiloride hydrochloride

产品活性：Amiloride hydrochloride (MK-870 hydrochloride) 是上皮钠通道 (ENaC) 和尿激酶型纤溶酶原激活物受体 (uTPA) 的抑制剂。Amiloride hydrochloride 是 polycystin-2 (PC2; TRPP2) 通道阻断剂。

研究领域：Membrane Transporter/Ion Channel  |  Neuronal Signaling  |  Apoptosis

作用靶点：Sodium Channel  |  TRP Channel  |  Apoptosis

In Vitro: Amiloride blocks δβγ channels with an IC₅₀ of 2.6 μM. The K_i of amiloride for δβγ ENaC is 26-fold that of αβγ channels (0.1 μM for αβγ ENaC). Amiloride blockade of δβγ ENaC is much more voltage dependent compared with the αβγ channel. The K_i of amiloride for δαβγ channels is 920 and 13.7 μM at ?120 and ⁺80 mV, respectively, which significantly differs from that of both αβγ and δβγ channels. Amiloride is a relatively selective inhibitor of the epithelial sodium channel (ENaC) with an IC₅₀ (the concentration required to reach 50% inhibition of an ion channel) in the concentration range of 0.1 to 0.5 μM. Amiloride is a relatively poor inhibitor of the the Na⁺/H⁺ exchanger (NHE) with an IC₅₀ as low as 3 μM in the presence of a low external [Na⁺] but as high as 1 mM in the presence of a high [Na⁺]. Amiloride is an even weaker inhibitor of the Na⁺/Ca²⁺ exchanger (NCX), with an IC₅₀ of 1 mM. Amiloride (1 μM) and submicromolar doses of Benzamil (30 nM), doses known to inhibit the ENaC, inhibit the myogenic vasoconstriction response to increasing perfusion pressure by blocking the activity of ENaC proteins. Amiloride completely inhibits Na⁺ influx in doses known to be relatively specific for ENaC (1.5 μM) in vascular smooth muscle cells (VSMC).

In Vivo: Amiloride (1 mg/kg/day) subcutaneously is found to reverse the initial increases in collagen deposition and prevent any further increases in the DOCA-salt hypertensive rat. Amiloride delays the onset of proteinuria and improved brain and kidney histologic scores in the saline-drinking, stroke-prone spontaneously hypertensive rats (SHRSP) compared with controls. Amiloride antagonizes or prevents actions of aldosterone in these cells and in cardiovascular and renal tissues in animals with salt-dependent forms of hypertension.

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