Topic: vardenafil

The cyclic nucleotides (cNs) cAMP and cGMP are involved in the cellular mechanisms underlying long-term potentiation (LTP) and memory. Because a decrease of cNs is observed in aging and neurodegenerative disorders, including Alzheimer's Disease (AD), drugs restoring cNs levels, such as PDE inhibitors (PDE-Is), have been proposed as potential therapeutic strategies. Previous studies showed a crosstalk between cNs and amyloid-beta (Aβ), a peptide extensively known for its pathological role in AD but also implicated in the physiological processes of synaptic plasticity and memory.Based on these f

Sleep deprivation (SD) negatively affects memory processes, particularly in the hippocampus. Previous research indicates that 6 hours of SD post-learning causes amnesia in hippocampus-dependent tasks. However, we recently demonstrated that object-location memories (OLMs) formed under SD conditions can be effectively recalled several days later using optogenetic engram reactivation or administration of the PDE4 inhibitor roflumilast. These findings suggest that these memories are not lost, but merely difficult to retrieve.Since both cAMP and cGMP signalling critically contribute to memory proce