2026-04-29T23:03:51Zhttps://repisalud.isciii.es/rest/oai/request

oai:repisalud.isciii.es:20.500.12105/187152024-09-21T20:23:06Zcom_20.500.12105_15322com_20.500.12105_2051col_20.500.12105_16927

00925njm 22002777a 4500 dc Medina-Vera, Dina author Navarro, Juan Antonio author Rivera, Patricia author Rosell-Valle, Cristina author Gutiérrez-Adán, Alfonso author Sanjuan, Carlos author López-Gambero, Antonio Jesús author Tovar, Rubén author Suárez, Juan author Pavón, Francisco Javier author Baixeras, Elena author Decara, Juan author Rodríguez de Fonseca, Fernando author 2022-07-18 Recent evidence links brain insulin resistance with neurodegenerative diseases, where hyperphosphorylated tau protein contributes to neuronal cell death. In the present study, we aimed to evaluate if d-pinitol inositol, which acts as an insulin sensitizer, affects the phosphorylation status of tau protein. We studied the pharmacological effect of d-pinitol on insulin signalling and tau phosphorylation in the hippocampus of Wistar and Zucker rats. To this end, we evaluated by western blotting the Akt pathway and its downstream proteins as being one of the main insulin-mediator pathways. Also, we explored the functional status of additional kinases phosphorylating tau, including PKA, ERK1/2, AMPK and CDK5. We utilized the 3xTg mouse model as a control for tauopathy, since it carries tau mutations that promote phosphorylation and aggregation. Surprisingly, we discovered that oral d-pinitol treatment lowered tau phosphorylation significantly, but not through the expected kinase GSK-3 regulation. An extensive search for additional kinases phosphorylating tau revealed that this effect was mediated through a mechanism dependent on the reduction of the activity of the CDK5, affecting both its p35 and p25 subunits. This effect disappeared in leptin-deficient Zucker rats, uncovering that the association of leptin deficiency, obesity, dyslipidaemia and hyperinsulinaemia abrogates d-pinitol actions on tau phosphorylation. The 3xTg mice confirmed d-pinitol effectiveness in a genetic AD-tauopathy. The present findings suggest that d-pinitol, by regulating CDK5 activity through a decrease of CDK5R1, is a potential drug for developing treatments for neurological disorders such as tauopathies. 10.1111/bph.15907 1476-5381 British journal of pharmacology http://hdl.handle.net/10668/19922 35760415 http://hdl.handle.net/20.500.12105/18715 Akt CDK5 d-pinitol insulin tau phosphorylation tauopathy d-Pinitol promotes tau dephosphorylation through a cyclin-dependent kinase 5 regulation mechanism: A new potential approach for tauopathies?