Phosphodiesterase (PDE) inhibitors are currently a widespread and extensively studied group of anti-inflammatory and anti-fibrotic compounds which may find use in the treatment of numerous lung diseases, including asthma and chronic obstructive pulmonary disease. Several PDE inhibitors are currently in clinical development, and some of them, e.g., roflumilast, are already recommended for clinical use. Due to numerous reports indicating that elevated intracellular cAMP levels may contribute to the alleviation of inflammation and airway fibrosis, new and effective PDE inhibitors are constantly being sought. Recently, a group of 7,8-disubstituted purine-2,6-dione derivatives, representing a novel and prominent pan-PDE inhibitors has been synthesized. Some of them were reported to modulate transient receptor potential ankyrin 1 (TRPA1) ion channels as well. In this study, we investigated the effect of selected derivatives (832—a pan-PDE inhibitor, 869—a TRPA1 modulator, and 145—a pan-PDE inhibitor and a weak TRPA1 modulator) on cellular responses related to airway remodeling using MRC-5 human lung fibroblasts. Compound 145 exerted the most considerable effect in limiting fibroblast to myofibroblasts transition (FMT) as well as proliferation, migration, and contraction. The effect of this compound appeared to depend mainly on its strong PDE inhibitory properties, and not on its effects on TRPA1 modulation. The strong anti-remodeling effects of 145 required activation of the cAMP/protein kinase A (PKA)/cAMP response element-binding protein (CREB) pathway leading to inhibition of transforming growth factor type β₁ (TGF-β₁) and Smad-dependent signaling in MRC-5 cells. These data suggest that the TGF-β pathway is a major target for PDE inhibitors leading to inhibitory effects on cell responses involved in airway remodeling. These potent, pan-PDE inhibitors from the group of 7,8-disubstituted purine-2,6-dione derivatives, thus represent promising anti-remodeling drug candidates for further research.

Phosphodiesterase 7 (PDE7) is an intracellular enzyme that specifically hydrolyzes the second messenger, cyclic-3’,5’-adenosine monophosphate (cAMP), into inactive noncyclic nucleotide, 5’-AMP. To date, many structurally diverse compounds with PDE7 inhibitory properties have been described, including selective PDE7 inhibitors, dual PDE4/PDE7, PDE7/PDE8, and PDE7/GSK-3 inhibitors, and non-selective PDE inhibitors with high affinity for PDE7. Inhibitors of PDE7 have provided beneficial effects in animal models of inflammatory and neurological disorders, including Alzheimer’s disease, Parkinson’s disease, multiple sclerosis, and many others. This review is a comprehensive summary of the current state-of-the-art in the field of design and synthesis of PDE7 inhibitors, their physicochemical properties, biological evaluation, and structure-activity relationships as well as it highlights the updated evidence for a potential therapeutic utility of these compounds. Moreover, new approaches to obtain more effective and safer PDE7 inhibitors than those available now are presented.

Alzheimer's Disease (AD) is an age-related neurodegenerative disorder characterized by progressive cognitive impairments and chronic inflammation that affects over 30 million people all over the world. Most of the Alzheimer's patients also suffer from psychosis, aggression, agitation, depression, anxiety, and many other behavioral and psychological symptoms of dementia. Unfortunately, the currently available anti-AD drugs provide modest symptomatic relief, and they do not reverse the neurodegeneration. Therefore, the average life expectancy after diagnosis is between six and ten years. Research data suggest that multi-target-directed ligands (MTDLs) give an opportunity to prevent, halt, or reverse the progression of AD, and reduce the symptoms of the disease. The aim of this review is to update the most recent reports on the development of MTDLs affecting serotonergic neurotransmission as potential drugs for both symptomatic and disease-modifying therapy of AD. Multifunctional modulators of serotonergic system exerted procognitive, antipsychotic, antidepressant, and/or anxiolytic properties in preclinical studies. Some of them revealed their potential as modulators of tau phosphorylation or amyloid beta aggregation with neuroprotective, anti-inflammatory, and/or antioxidant properties. Among them, lumateperone - an inhibitor of serotonin transporter with a high affinity for serotonergic and dopaminergic receptors is currently being tested in clinical trials in patients with dementia, bipolar depression, or schizophrenia. The high therapeutic potential of MTDLs as anti-AD drugs seems to be the result of their involvement in multiple neurotransmitter systems and intracellular signaling pathways.