Phosphodiesterase inhibitor

Phosphodiesterase-5

A phosphodiesterase inhibitor is a drug that blocks one or more of the five subtypes of the enzyme phosphodiesterase (PDE), thereby preventing the inactivation of the intracellular second messengers, cyclic adenosine monophosphate (cAMP) and cyclic guanosine monophosphate (cGMP) by the respective PDE subtype(s). The ubiquitous presence of this enzyme means that non-specific inhibitors have a wide range of actions, the actions in the heart, and lungs being some of the first to find a therapeutic use.

History

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The different forms or subtypes of phosphodiesterase were initially isolated from rat brains in the early 1970s[1][2] and were soon afterward shown to be selectively inhibited in the brain and in other tissues by a variety of drugs.[3][4] The potential for selective phosphodiesterase inhibitors as therapeutic agents was predicted as early as 1977 by Weiss and Hait.[5] This prediction meanwhile has proved to be true in a variety of fields.

Classification

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Nonselective PDE inhibitors

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Methylated xanthines and derivatives:[6]

Methylated xanthines act as both

  1. competitive nonselective phosphodiesterase inhibitors,[6] which raise intracellular cAMP, activate PKA, inhibit TNF-alpha[7][8] and leukotriene[9] synthesis, and reduce inflammation and innate immunity[9] and
  2. nonselective adenosine receptor antagonists[10]

But different analogues show varying potency at the numerous subtypes, and a wide range of synthetic xanthine derivatives (some nonmethylated) have been developed in the search for compounds with greater selectivity for phosphodiesterase enzyme or adenosine receptor subtypes.[11][12][13][14][15][16][17][18][19][20][21][22][23]

PDE2 selective inhibitors

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  • EHNA (erythro-9-(2-hydroxy-3-nonyl)adenine)
  • BAY 60-7550 (2-[(3,4-dimethoxyphenyl)methyl]-7-[(1R)-1-hydroxyethyl]-4-phenylbutyl]-5-methyl-imidazo[5,1-f][1,2,4]triazin-4(1H)-one)
  • Oxindole
  • PDP (9-(6-Phenyl-2-oxohex-3-yl)-2-(3,4-dimethoxybenzyl)-purin-6-one)

PDE3 selective inhibitors

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PDE3 is sometimes referred to as cGMP-inhibited phosphodiesterase.

PDE4 selective inhibitors

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PDE4 inhibitors
  • Mesembrenone, an alkaloid from the herb Sceletium tortuosum
  • Rolipram, used as investigative tool in pharmacological research
  • Ibudilast, a neuroprotective and bronchodilator drug used mainly in the treatment of asthma and stroke. It inhibits PDE4 to the greatest extent, but also shows significant inhibition of other PDE subtypes, and so acts as a selective PDE4 inhibitor or a non-selective phosphodiesterase inhibitor, depending on the dose.
  • Piclamilast, a more potent inhibitor than rolipram.[25]
  • Luteolin, supplement extracted from peanuts that also possesses IGF-1 properties.[26]
  • Drotaverine, used to alleviate renal colic pain, also to hasten cervical dilatation in labor
  • Roflumilast, indicated for people with severe COPD to prevent symptoms such as coughing and excess mucus from worsening[27]
  • Apremilast, used to treat psoriasis and psoriatic arthritis.
  • Crisaborole, used to treat atopic dermatitis.
  • Glaucine, an aporphine alkaloid, low-potency PDE4 inhibitor, calcium channel blocker, dopamine antagonist and 5-HT2A positive allosteric modulator, used as antitussive in Eastern Europe and Iceland.

PDE4 is the major cAMP-metabolizing enzyme found in inflammatory and immune cells. PDE4 inhibitors have proven potential as anti-inflammatory drugs, especially in inflammatory pulmonary diseases such as asthma, COPD, and rhinitis. They suppress the release of cytokines and other inflammatory signals, and inhibit the production of reactive oxygen species. PDE4 inhibitors may have antidepressive effects[28] and have also been proposed for use as antipsychotics.[29][30]

On October 26, 2009, the University of Pennsylvania reported that researchers at their institution had discovered a link between elevated levels of PDE4 (and therefore decreased levels of cAMP) in sleep deprived mice. Treatment with a PDE4 inhibitor raised the deficient cAMP levels and restored some functionality to hippocampus-based memory functions.[31]

PDE5 selective inhibitors

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PDE7 selective inhibitors

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Recent studies have shown quinazoline type PDE7 inhibitor to be potent anti-inflammatory and neuroprotective agents.[32]

PDE9 selective inhibitors

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Paraxanthine, the main metabolite of caffeine (84% in humans),[33] is another cGMP-specific phosphodiesterase inhibitor which inhibits PDE9, a cGMP preferring phosphodiesterase.[34][35] PDE9 is expressed as high as PDE5 in the corpus cavernosum.[36]

PDE10 selective inhibitors

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Papaverine, an opium alkaloid, has been reported to act as a PDE10 inhibitor.[37][38][39] PDE10A is almost exclusively expressed in the striatum and subsequent increase in cAMP and cGMP after PDE10A inhibition (e.g. by papaverine) is "a novel therapeutic avenue in the discovery of antipsychotics".[40]

References

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  2. ^ Uzunov P.; Weiss B. (1972). "Separation of multiple molecular forms of cyclic adenosine 3',5'-monophosphate phosphodiesterase in rat cerebellum by polyacrylamide gel electrophoresis". Biochim. Biophys. Acta. 284 (1): 220–226. doi:10.1016/0005-2744(72)90060-5. PMID 4342220.
  3. ^ Weiss B (1975). "Differential activation and inhibition of the multiple forms of cyclic nucleotide phosphodiesterase". Adv. Cycl. Nucl. Res. 5: 195–211. PMID 165666.
  4. ^ Fertel R, Weiss B (1976). "Properties and drug responsiveness of cyclic nucleotide phosphodiesterases of rat lung". Mol. Pharmacol. 12 (4): 678–687. PMID 183099.
  5. ^ Weiss B.; Hait W.N. (1977). "Selective cyclic nucleotide phosphodiesterase inhibitors as potential therapeutic agents". Annu. Rev. Pharmacol. Toxicol. 17: 441–477. doi:10.1146/annurev.pa.17.040177.002301. PMID 17360.
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  13. ^ Constantin Koulbanis, Claude Bouillon, Patrick Darmenton,"Cosmetic compositions having a slimming action", US patent 4288433, granted 1981-09-04 , assigned to L'Oreal 
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  26. ^ Yu MC, Chen JH, Lai CY, Han CY, Ko WC (2009). "Luteolin, a non-selective competitive inhibitor of phosphodiesterases 1–5, displaced [(3)H]-rolipram from high-affinity rolipram binding sites and reversed xylazine/ketamine-induced anesthesia". Eur J Pharmacol. 627 (1–3): 269–75. doi:10.1016/j.ejphar.2009.10.031. PMID 19853596.
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  38. ^ Inhibitory Mechanism of Papaverine on Carbachol-Induced Contraction in Bovine Trachea; Takeharu Kaneda1,*, Yukako Takeuchi1, Hirozumi Matsui1, Kazumasa Shimizu1, Norimoto Urakawa1,and Shinjiro Nakajyo, Division of Veterinary Pharmacology, Nippon Veterinary and Animal Science University; http://www.jstage.jst.go.jp/article/jphs/98/3/275/_pdf[permanent dead link]
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  40. ^ Effects of phosphodiesterase 10 inhibition on striatal cyclic AMP and peripheral physiology in rats; An Torremans, Abdellah Ahnaou, An Van Hemelrijck, Roel Straetemans, Helena Geys, Greet Vanhoof, Theo F. Meert, and Wilhelmus H. Drinkenburg; "Archived copy" (PDF). Archived (PDF) from the original on 2011-10-07. Retrieved 2011-08-27.{{cite web}}: CS1 maint: archived copy as title (link)