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Neurotensin via Type I Receptor Modulates the Endotoxemia Induced Oxido-Inflammatory Stress on the Sympathetic Adrenomedullary System of Mice Regulating NF-κβ/Nor-Epinephrine Pathway.
Cell Biochem Biophys
January 2025
Department of Zoology, University of Allahabad, Prayagraj, Uttar Pradesh, 211002, India.
The present study investigated the role of the neurotensin/NTS in the modulation of the lipopolysaccharide/LPS induced dysfunction of the sympatho-adrenal-medullary system/SAM using both the NTS receptor 1/NTSR agonist PD149163/PD and antagonist SR48692 /SR. Forty eight mice were maintained in eight groups; Group I/control, Groups II, III, IV, and VII received LPS for 5 days further Group III/IV/VII received PD low dose/PD, PD high dose /PD and SR for 28 days respectively. Group V/VI received similar only PD and PD dose respectively whereas Group VIII was exposed to only SR for 28 days.
View Article and Find Full Text PDFPost-retrieval noradrenergic activation impairs subsequent memory depending on cortico-hippocampal reactivation.
Elife
January 2025
Department of Cognitive Psychology, University of Hamburg, Hamburg, Germany.
When retrieved, seemingly stable memories can become sensitive to significant events, such as acute stress. The mechanisms underlying these memory dynamics remain poorly understood. Here, we show that noradrenergic stimulation after memory retrieval impairs subsequent remembering, depending on hippocampal and cortical signals emerging during retrieval.
View Article and Find Full Text PDFO-GlcNAcylation regulates tyrosine hydroxylase serine 40 phosphorylation and L-DOPA levels.
Am J Physiol Cell Physiol
January 2025
Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro.
O-GlcNAcylation is a post-translational modification characterized by the covalent attachment of a single moiety of GlcNAc on serine/threonine residues in proteins. Tyrosine hydroxylase (TH), the rate-limiting step enzyme in the catecholamine synthesis pathway and responsible for production of the dopamine precursor, L-DOPA, has its activity regulated by phosphorylation. Here, we show an inverse feedback mechanism between O-GlcNAcylation and phosphorylation of TH at serine 40 (TH pSer40).
View Article and Find Full Text PDFCircadian influences on sudden cardiac death and cardiac electrophysiology.
J Mol Cell Cardiol
January 2025
Department of Physiology, University of Kentucky, Lexington, KY, USA; Department of Internal Medicine, University of Kentucky, Lexington, KY, USA. Electronic address:
Cardiologists have analyzed daily patterns in the incidence of sudden cardiac death to identify environmental, behavioral, and physiological factors that trigger fatal arrhythmias. Recent studies have indicated an overall increase in sudden cardiac arrest during daytime hours when the frequency of arrhythmogenic triggers is highest. The risk of fatal arrhythmias arises from the interaction between these triggers-such as elevated sympathetic signaling, catecholamine levels, heart rate, afterload, and platelet aggregation-and the heart's susceptibility (myocardial substrate) to them.
View Article and Find Full Text PDFBehavior Changes in Quinpirole Obsessive-Compulsive Disorder Rats Treated with 6-Hydroxydopamine and the Corresponding Dopaminergic Compulsive Loop Mechanism.
J Integr Neurosci
January 2025
Department of Neurosurgery, Affiliated Hospital of Southwest Medical University, 646000 Luzhou, Sichuan, China.
Background: Recent studies suggest that the anterior limb of the internal capsule may be an area of convergence for multiple compulsion loops. In this study, the role of different dopaminergic compulsion loops in the mechanism of obsessive-compulsive disorder (OCD) was investigated by selectively damaging dopaminergic neurons or fibers in the corresponding targets with 6-hydroxydopamine (6-OHDA) and depicting the anatomical map of various compulsion loops located in the anterior limb of the internal capsule.
Methods: A total of 52 male Sprague Dawley (SD) rats were exposed to either saline (1 mL/kg, NS group, n = 6) or quinpirole (QNP, dopamine D2-agonist, 0.
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