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Phosphodiesterase III enzyme (PDE3)
- Target
- PDE3
- Molecular classification
- Enzyme, Phosphodiesterase
01
Overview
Phosphodiesterase III (PDE3) is an enzyme belonging to the phosphodiesterase family, which hydrolyzes cyclic nucleotides—specifically cyclic adenosine monophosphate (cAMP) and cyclic guanosine monophosphate (cGMP)—into their inactive forms. PDE3 plays a critical role in regulating intracellular levels of these second messengers, thereby influencing various physiological processes. PDE3 consists of two main isoforms: PDE3A and PDE3B. PDE3A is primarily involved in cardiovascular function and fertility, while PDE3B is mainly implicated in lipolysis but also present in other tissues. Pharmacological inhibition provides therapeutic benefit acutely but carries significant risks chronically due to pro-arrhythmic potential.
- Other names
- Cyclic nucleotide phosphodiesterase 3PDE3APDE3B
02
Mechanism of action
Phosphodiesterase III inhibition, leading to increased intracellular cAMP and cGMP levels.
03
Biological functions
Regulation of cardiac contractilityVascular smooth muscle tone controlPlatelet aggregation modulationLipolysis regulationcAMP hydrolysiscGMP hydrolysis
04
Disease associations
Heart failureThrombosisMetabolic disordersFertility issues
05
Safety considerations
ArrhythmiasIncreased mortality in heart failure patients (with long-term use)Pro-arrhythmic potential
06
Interacting drugs
Milrinone
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