FPL 64176

FPL 64176 acts as a non-dihydropyridine L-type calcium channel activator with high efficacy properties. It's a benzoylpyrrole compound that has the ability to increase macroscopic inward current through L-type calcium channels. It extends the opening of single calcium channels during depolarization and slows channel closing upon repolarization without affecting currents through other calcium channels^1-3.

FPL 64176 is being used as a tool for studying the physiological roles and disorders of L-type channels, identification of L-type currents within the mix of channel subtypes and for increasing the contractility of smooth and cardiac muscle².

The use of FPL 64176 has revealed an inactivation and adaptation process for ryanodine receptors and the presence of cardiac sparklets^3,4.

L-type voltage-gated calcium channels are one of the three major classes (Ca_V1-Ca_V3) of voltage-gated calcium channels. They are expressed in many excitable tissues and play as important transducers in the plasma membrane, altering membrane depolarization to intracellular signaling. Many physiological functions, including brain, endocrine, and sensory functions and muscle contraction rely on proper L-type channel activity⁵.