Phosphodiesterases and Their Inhibitors

INTRODUCTION
 
TOWARD A NEW GENERATION OF PDE5 INHIBITORS THROUGH ADVANCES IN MEDICINAL CHEMISTRY
Introduction
The First-Generation Agents
PDE5 as a Mechanism and Alternative Indications Beyond MED
A Summary of PDE5 Chemotypes Reported Post-2010
Second-Generation PDE5 Inhibitors from Pfizer: Pyrazolopyrimidines
Second-Generation PDE5 Inhibitors from Pfizer: Pyridopyrazinones
Conclusions
 
PDE4: NEW STRUCTURAL INSIGHTS INTO A REGULATORY MECHANISM AND IMPLICATIONS FOR THE DESIGN OF SELECTIVE INHIBITORS
Introduction
Isoforms, Domain Organizations, and Splice Variants
Structural Features of the Catalytic Site
Regulation of PDE4 Activity
Crystal Structure of Regulatory Domains of PDE4
URC2 Interaction and Selectivity
Conclusions
 
PDE4: RECENT MEDICINAL CHEMISTRY STRATEGIES TO MITIGATE ADVERSE EFFECTS
Introduction
Brief Summary of pan-PDE4 Inhibitors
PDE4 Strategies to Avoid Gastrointestinal Events
Conclusions
 
THE FUNCTION, ENZYME KINETICS, STRUCTURAL BIOLOGY, AND MEDICINAL CHEMISTRY OF PDE10A
Enzymology and Protein Structure
Papaverine-Related PDE10A Inhibitors
MP-10/PF-2545920 Class of Inhibitors
PF-2545920/MP-Inspired Inhibitors
PF-2545920/Papaverine/Quinazoline Hybrid Series of Inhibitors
PET Ligand Development
Summary and Future
 
THE STATE OF THE ART IN SELECTIVE PDE2A INHIBITOR DESIGN
Introduction
Selective PDE2A Inhibitors
Methods
Conclusions
 
CRYSTAL STRUCTURES OF PHOSPHODIESTERASE 9A AND INSIGHT INTO INHIBITOR DISCOVERY
Introduction
Subtle Asymmetry of the PDE9 Dimer in the Crystals
The Structure of the PDE9 Catalytic Domain
Interaction of Inhibitors with PDE9
Implication on Inhibitor Selectivity
 
PDEs AS CNS TARGETS: PDE9 INHIBITORS FOR COGNITIVE DEFICIT DISEASES
PDE9A Enzymology and Pharmacology
Crystal Structures of PDE9A Inhibitors
Medicinal Chemistry Efforts toward Identifying PDE9A Inhibitors for Treating Cognitive Disorders
Analysis of CNS Desireability of PDE9A

Spiros Liras is the head of the cardiovascular metabolic and endocrine diseases (CVMED) medicinal chemistry department at Pfizer R&D in Cambridge, MA (USA). Previously, he was Senior Director of medicinal chemistry in Neuroscience at Pfizer, working on treatments for addiction, depression, schizophrenia, cognition and Alzheimer's disease. In Neuroscience he worked on multiple PDE targets for the treatment of neuropsychiatric diseases including PDE10, PDE9, PDE2 and PDE1. Dr. Liras obtained his PhD in organic chemistry in 1989 from Iowa State University. He joined Pfizer in 1994 after postdoctoral studies at the University of Texas at Austin. He is a coauthor in more than 70 publications and patents.
 
Andrew Bell was with Pfizer for over 30 years, following studies at York University (UK). He spent his early career working on PDE inhibitors leading to the inotrope/ vasodilator (PDE3) candidate, nanterinone, and the PDE5 inhibitor, sildenafil (Viagra, Revatio). Soon after the launch of sildenafil in 1998, he was given responsibility for File Enrichment, as part of Pfizer's collaborations with ArQule and Tripos. He has subsequently applied the results of the File Enrichment investment to generate new lead series for multiple projects, including novel series of selective PDE- 4,5,8 and 9 inhibitors. He is currently involved in research into parasitic diseases at Imperial College, London.