The enzymes involved in cyclic nucleotide turnover (adenylate cyclase, guanylate cyclase, phosphodiesterase) were located in various regions of the brain, in synaptosomes and isolated synaptic membranes, using electron cytochemical methods. The interaction of the above enzymes in the processes of adrenergic and cholinergic cell reception in the CNS are discussed.
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Alzheimers Dement
December 2024
AriBio Co., Ltd., Seongnam, Korea, Republic of (South).
Background: AR1001 is a specific inhibitor of phosphodiesterase-5 (PDE5), which degrades cyclic guanosine monophosphate (cGMP). cGMP/cAMP response element-binding protein (CREB)/brain-derived neurotrophic factor (BDNF) signaling, which is critical for learning and memory processes, is disturbed in Alzheimer's disease (AD). AR1001 at the oral dose of 30 mg QD is currently in a global Phase 3 clinical trial in early AD patients (NCT05531526).
View Article and Find Full Text PDFBackground: Irsenontrine (e2027) is a potent and selective PDE9 inhibitor that increases cellular cGMP which is important for glutamatergic synaptic function. Irsenontrine was investigated to improve cognition in Lewy Body Dementia (LBD; DLB and PDD), and recent phase 2 study data suggests that irsenontrine could be more effective in DLB patients without amyloid copathology. Here, we evaluated differential change from baseline levels in proteins associated with cGMP pathway in DLB participants without amyloid co-pathology (DLB A-) compared to DLB participants with amyloid co-pathology (DLB A+).
View Article and Find Full Text PDFNucleic Acids Res
January 2025
Advanced Analysis Data Center, Korea Institute of Science and Technology, Hwarang-ro 14-5, Seongbuk-gu, Seoul 02792, Republic of Korea.
Riboswitches are RNAs that recognize ligands and regulate gene expression. They are typically located in the untranslated region of bacterial messenger RNA and consist of an aptamer and an expression platform. In this study, we examine the folding pathway of the Vc2 (Vibrio cholerae) riboswitch aptamer domain, which targets the bacterial secondary messenger cyclic-di-GMP.
View Article and Find Full Text PDFJ Integr Plant Biol
January 2025
State Key Laboratory of Crop Genetics & Germplasm Enhancement and Utilization, College of Agriculture, Nanjing Agricultural University, Nanjing, 210095, China.
Members of the cyclic nucleotide-gated channel (CNGC) proteins are reportedly involved in a variety of biotic and abiotic responses and stomatal movement. However, it is unknown if and how a single member could regulate multiple responses. Here we characterized three closely related CNGC genes in rice, OsCNGC14, OsCNGC15 and OsCNGC16, to determine whether they function in multiple abiotic stresses.
View Article and Find Full Text PDFJ Clin Invest
January 2025
Rutgers Institute for Translational Medicine and Science, New Brunswick, United States of America.
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