1. GPCR/G Protein
  2. Angiotensin Receptor
  3. A81988

A81988 (Synonyms: Abbott81988)

Cat. No.: HY-U00188
Handling Instructions

A81988 is a potent, competitive, non-peptidic antagonist of angiotensin AT1 receptors.

For research use only. We do not sell to patients.

A81988 Chemical Structure

A81988 Chemical Structure

CAS No. : 141887-34-5

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A81988 is a potent, competitive, non-peptidic antagonist of angiotensin AT1 receptors.

IC50 & Target

Angiotensin AT1 receptor[1]

In Vitro

A81988 (A-81988) is labeled with tritium to high specific activity (16 Ci/mmol) and radioligand binding assays performed in rat liver membranes. [3H]A81988 binds with high affinity (KD=0.57 nM) and the KD determined from kinetics assays is similar. Non-specific binding (defined with 1 μM angiotensin-II) is very low (< 6% at the KD). The binding of [3H]A81988 is competitive and exhibits appropriate pharmacological specificity for compounds acting at angiotensin AT1 receptors[1].

In Vivo

To verify this hypothesis, B2-/- or wild-type mice (B2+/+) are administered a nonpeptide antagonist of Ang II type 1 (AT1) receptors (A81988) from conception through 180 days of age. Untreated B2+/+ and B2-/- served as controls. Blood pressure (BP) and heart rate are monitored with the use of tail-cuff plethysmography at regular intervals. Ventricular weights, diameters, wall thickness, chamber volume, and myocardial fibrosis are measured at 40 and 180 days. No differences are observed in BP, heart rate, and cardiac weight and dimensions between treated and untreated B2+/+. The BP of AT1 antagonist-treated B2-/- is reduced until 70 days; then, it increases to the levels found in untreated B2-/-. AT1 receptor blockade results in a reduction in left ventricular mass, chamber volume, and wall thickness and abrogated myocardial fibrosis in B2-/-[2]. A81988 (A-81988) decreases the BP of Bk2r-/- either in normosodic conditions or after sodium deprivation, whereas in Bk2r+/+ it produces a modest decrease under hyposodic conditions only[3].

Molecular Weight









Room temperature in continental US; may vary elsewhere.


Please store the product under the recommended conditions in the Certificate of Analysis.

Animal Administration

B2-/- mice and wild-type J129Sv controls (B2+/+) are used. Pregnant mice are administered the nonpeptidic antagonist of Ang II AT1 receptors, A81988 (1.7 mg/kg BW per day in drinking water) or vehicle. At the dose indicated above, A81988 (A-81988) is able to antagonize the vasopressor effect of 10 pmol intravenous Ang II by 75% in mice. At 2 days after birth, the gender of the pups is determined, and each litter is culled to 5 male pups. Mice whose mother is treated during pregnancy continued to receive the antagonist until 180 days of age (treated B2+/+ and B2-/-, n=25 each group). Untreated controls of each strain (n=25 per group) are provided regular tap water. The animals are housed at a constant room temperature (24±1°C) and humidity (60±3%).
Animals are randomly assigned to a normal (0.12 mmol/g chow, n=8 each group), a low (0.02 mmol/g chow, n=8 each group), or a high (0.84 mmol/g chow, n=8 each group) sodium diet. After 15 days, they received the antagonist A81988 (A-81988) for 10 days at the dose of 170 μg/100 g body wt per day orally. In the rat, the antagonist potency of A81988 on the vasopressor response to intravenous angiotensin II is greater than that of losartan by a factor of at least 10. A81988 has no affinity for adrenergic, cholinergic, endothelin, or PAF receptors, and it is >1000-fold more selective for AT1- versus AT2-receptors. In preliminary experiments, A81988 is able to antagonize the vasopressor effect of 10 pmol intravenous angiotensin II by 75%. Tail-cuff BP is measured twice under basal conditions, every 5 days during A81988 administration, and then after discontinuation of the compound.

MCE has not independently confirmed the accuracy of these methods. They are for reference only.

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A81988Abbott81988A 81988A-81988Abbott 81988Abbott-81988Angiotensin ReceptorInhibitorinhibitorinhibit

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