Pinacidil monohydrate

Pinacidil monohydrate is a pharmaceutical compound primarily known as a potassium channel opener. Here’s a detailed breakdown of its functionality:

1. Mechanism of Action

• Pinacidil is a potassium (K⁺) channel opener, specifically targeting ATP-sensitive K⁺ channels (K_ATP channels) in the vascular smooth muscle.

• Opening these channels causes hyperpolarization of the cell membrane.

• Hyperpolarization reduces calcium influx through voltage-gated calcium channels.

• Lower intracellular calcium leads to relaxation of vascular smooth muscle, causing vasodilation.

2. Pharmacological Effects

• Vasodilation: Primarily in arterioles, leading to reduced peripheral resistance.

• Blood Pressure Reduction: It acts as an antihypertensive agent in experimental models.

• Effects on Coronary and Skeletal Muscle: Can increase blood flow due to smooth muscle relaxation.

• Insulin Secretion Modulation: In pancreatic β-cells, opening K_ATP channels can inhibit insulin release (like other K_ATP openers).

3. Research and Experimental Uses

• Widely used in cardiovascular research to study K_ATP channel physiology.

• Sometimes used in ischemia models to test cardioprotective effects.

• Tool compound in electrophysiology studies for vascular and cardiac cells.

4. Chemical and Physical Properties

• Monohydrate form: contains one molecule of water per molecule of pinacidil.

• Molecular weight: ~288.8 g/mol (for monohydrate).

• Soluble in DMSO; poorly soluble in water.

5. Summary

0°C (short term), -20°C (long term), desiccated