acy-1215 and Alzheimer-Disease

Alzheimer's disease (AD) as the most prevalent dementia type has become one of the greatest threats to the health and life of the elder people worldwide. Although there has been a great effort in the discovery of anti-AD drugs, those approval drugs only demonstrated the temporarily relieving the symptoms without completely stopping the progression of the neuropathology. It is very urgent and reasonable to develop more effective agents against other therapeutic targets. In the last two decades, zinc-dependent deacetylases (HDACs) have attracted much attention as an important group of epigenetic targets in drug discovery, because five HDAC inhibitors have been approved for clinically treating cancers. This review is to summarize the possible roles of HDACs in AD pathophysiology and their inhibitors used in AD studies. And the future perspectives related to HDACs as epigenetic targets for treating AD by their selective inhibitors, multi-target inhibitors or PROTACs are also discussed.

Topics: Aged; Alzheimer Disease; Histone Deacetylase Inhibitors; Histone Deacetylases; Humans; Neoplasms; Zinc

Alzheimer's disease (AD) is one of the most common neurodegenerative disorders, which is characterized by the primary risk factor, age. Several attempts have been made to treat AD, while most of them end in failure. However, with the deepening study of pathogenesis of AD, the expression of HDAC6 in the hippocampus, which plays a major role of the memory formation, is becoming worth of notice. Neurofibrillary tangles (NFTs), a remarkable lesion in AD, has been characterized in association with the abnormal accumulation of hyperphosphorylated Tau, which is mainly caused by the high expression of HDAC6. On the other hand, the hypoacetylated tubulin induced by HDAC6 is also fatal for the neuronal transport, which is the key impact of the formation of axons and dendrites. Overall, the significantly increased expression of HDAC6 in brain regions is deleterious to neuron survival in AD patients. Based on the above research, the inhibition of HDAC6 seems to be a potential therapeutic method for the treatment of AD. Up to now, various types of HDAC6 inhibitors have been discovered. This review mainly analyzes the HDAC6 inhibitors reported amid 2010-2020 in terms of their structure, selectivity and pharmacological impact towards AD. And we aim at facilitating the design and development of better HDAC6 inhibitors in the future.

Topics: Acetamides; Alzheimer Disease; Histone Deacetylase 6; Histone Deacetylase Inhibitors; Humans; Hydroxamic Acids; Models, Molecular; Molecular Structure; Neuroprotective Agents

Topics: Alzheimer Disease; Animals; Catalytic Domain; Cell Line, Transformed; Coumaric Acids; Histone Deacetylase 6; Histone Deacetylase Inhibitors; Immunologic Factors; Male; Melatonin; Mice; Molecular Docking Simulation; Neuroprotective Agents; Structure-Activity Relationship; Tryptamines

We have identified chemical probes that act as dual phosphodiesterase 5 (PDE5) and histone deacetylase 6 (HDAC6)-selective inhibitors (>1 log unit difference versus class I HDACs) to decipher the contribution of HDAC isoforms to the positive impact of dual-acting PDE5 and HDAC inhibitors on mouse models of Alzheimer's disease (AD) and fine-tune this systems therapeutics approach. Structure- and knowledge-based approaches led to the design of first-in-class molecules with the desired target compound profile: dual PDE5 and HDAC6-selective inhibitors. Compound 44b, which fulfilled the biochemical, functional and ADME-Tox profiling requirements and exhibited adequate pharmacokinetic properties, was selected as pharmacological tool compound and tested in a mouse model of AD (Tg2576) in vivo.

Topics: Alzheimer Disease; Cell Line; Cyclic Nucleotide Phosphodiesterases, Type 5; Dose-Response Relationship, Drug; Drug Design; Histone Deacetylase 6; Histone Deacetylase Inhibitors; Humans; Molecular Structure; Neuroglia; Phosphodiesterase 5 Inhibitors; Structure-Activity Relationship

This paper reports the development of a series of 5-aroylindolyl-substituted hydroxamic acids. N-Hydroxy-4-((5-(4-methoxybenzoyl)-1 H-indol-1-yl)methyl)benzamide (6) has potent inhibitory selectivity against histone deacetylase 6 (HDAC6) with an IC

Topics: Alzheimer Disease; Animals; Binding Sites; Blood-Brain Barrier; Cell Line; Disease Models, Animal; Female; Histone Deacetylase 6; Histone Deacetylase Inhibitors; Humans; Hydroxamic Acids; Indoles; Male; Memory and Learning Tests; Mice, Transgenic; Molecular Docking Simulation; Neuroprotective Agents; Phosphorylation; Rats, Sprague-Dawley; Rats, Wistar; tau Proteins; Ubiquitination

Histone deacetylase 6 (HDAC6) is currently being discussed as a promising therapeutic target for the treatment of Alzheimer's disease (AD). Mounting evidence indicates that increased HDAC6 expression may contribute to AD-associated neurodegeneration, although beneficial effects have also been identified. In the present study, we tested the potential of two selective HDAC6 inhibitors, tubastatin A and ACY-1215, to rescue cognitive deficits in a mouse model of AD. We found that both tubastatin A and ACY-1215 alleviated behavioral deficits, altered amyloid-β (Aβ) load, and reduced tau hyperphosphorylation in AD mice without obvious adverse effects. Our data suggested that tubastatin A and ACY-1215 not only promoted tubulin acetylation, but also reduced production and facilitated autophagic clearance of Aβ and hyperphosphorylated tau. Further, the decreased hyperphosphorylated tau and increased tubulin acetylation may account for the improved microtubule stability in AD mice after tubastatin A/ACY-1215 treatment. These preclinical results support the detrimental role of HDAC6 in AD, and offer prospective approaches for using tubastatin A/ACY-1215 as potential therapeutic strategy for AD.

Topics: Alzheimer Disease; Amyloid beta-Peptides; Amyloid beta-Protein Precursor; Animals; Brain; Cognition Disorders; Disease Models, Animal; Exploratory Behavior; Gene Expression Regulation; Histone Deacetylase 6; Histone Deacetylase Inhibitors; Histone Deacetylases; Humans; Hydroxamic Acids; Indoles; Maze Learning; Mice; Mice, Inbred C57BL; Mice, Transgenic; Peptide Fragments; Phosphorylation; Presenilin-1; Pyrimidines; Tubulin