Losartan Carboxylic Acid (E-3174), an active carboxylic acid metabolite of Losartan, is anangiotensin II receptor type 1 (AT1)antagonist. TheK_ivalues are 0.97, 0.57, 0.67 nM for rat AT1B/AT1A and human AT1, respectively. Losartan Carboxylic Acid blocks the angiotensin II-induced responses in vascular smoothmuscle cells (VSMC). Losartan Carboxylic Acid elevates plasmareninactivities and reduces mean arterial pressure^[1][2][3][4].

Angiotensin II receptor type 1^[1]

The specific binding of [125I]-angiotensin II to VSMC is inhibited by Losartan Carboxylic Acid (E-3174) with an IC₅₀of 1.1 nM. Losartan Carboxylic Acid abolishes the angiotensin II-induced formation of inositolphosphates in VSMC. Losartan Carboxylic Acid inhibits the angiotensin II-induced elevation of intracellular cytosolic Ca2+ concentration with an IC₅₀of 5 nM. Losartan Carboxylic Acid is more effective than losartan in blocking the angiotensin II-induced increase in Egr-1 mRNA. Losartan Carboxylic Acid inhibits the angiotensin II-induced cell protein synthesis with an IC₅₀of 3 nM^[1].

Losartan Carboxylic Acid (E-3174) (0.1 mg/kg; i.v. followed by 0.02 mg/kg/h for 5.5 h) induces a similar level of inhibition (87±4%) of the pressor responses to angiotensin I^[3].
Intravenous Losartan Carboxylic Acid (0.1 mg/kg+0.01 mg/kg/min) is infused in anesthetized dogs with recent (8.1±0.4 days) anterior myocardial infarction. Electrolytic injury of the left circumflex coronary artery to induce thrombotic occlusion and posterolateral ischemia is initiated 1 h after the start of treatment^[4].

436.89

Solid

C₂₂H₂₁ClN₆O₂

124750-92-1

Room temperature in continental US; may vary elsewhere.

DMSO : ≥ 250 mg/mL(572.23 mM)

*"≥" means soluble, but saturation unknown.

请根据产品在不同溶剂中的溶解度选择合适的溶剂配制储备液；一旦配成溶液，请分装保存，避免反复冻融造成的产品失效。
储备液的保存方式和期限：-80℃, 6 months; -20℃, 1 month。-80℃ 储存时，请在 6 个月内使用，-20℃ 储存时，请在 1 个月内使用。

请根据您的实验动物和给药方式选择适当的溶解方案。以下溶解方案都请先按照In Vitro方式配制澄清的储备液，再依次添加助溶剂：

——为保证实验结果的可靠性，澄清的储备液可以根据储存条件，适当保存；体内实验的工作液，建议您现用现配，当天使用； 以下溶剂前显示的百
分比是指该溶剂在您配制终溶液中的体积占比；如在配制过程中出现沉淀、析出现象，可以通过加热和/或超声的方式助溶

• 1.

  请依序添加每种溶剂： 10% DMSO    40%PEG300   5%Tween-80   45% saline

  Solubility: ≥ 2.08 mg/mL (4.76 mM); Clear solution

  此方案可获得 ≥ 2.08 mg/mL (4.76 mM，饱和度未知) 的澄清溶液。

  以 1 mL 工作液为例，取 100 μL 20.8 mg/mL 的澄清 DMSO 储备液加到 400 μL PEG300 中，混合均匀；向上述体系中加入50 μL Tween-80，混合均匀；然后继续加入 450 μL生理盐水定容至 1 mL。

  将 0.9 g 氯化钠，完全溶解于 100 mL ddH2O 中，得到澄清透明的生理盐水溶液
• 2.

  请依序添加每种溶剂： 10% DMSO    90%corn oil

  Solubility: ≥ 2.08 mg/mL (4.76 mM); Clear solution

  此方案可获得 ≥ 2.08 mg/mL (4.76 mM，饱和度未知) 的澄清溶液，此方案不适用于实验周期在半个月以上的实验。

  以 1 mL 工作液为例，取 100 μL 20.8 mg/mL 的澄清 DMSO 储备液加到 900 μL玉米油中，混合均匀。