Focal Thalamic Degeneration from Ethanol and Thiamine Deficiency is Associated with Neuroimmune Gene Induction, Microglial Activation, and Lack of Monocarboxylic Acid Transporters. (11th October 2013)

• Record Type: Journal Article
• Authors: Qin, Liya; Crews, Fulton T.
• Is Part Of: Alcoholism. Volume 38:Number 3(2014:Mar.)
• Page Start: 657
• Page End: 671
• Publication Date: 2013-10-11
• Subjects: Alcoholism -- Periodicals; Alcoholism -- Periodicals; Alcoolisme; Electronic journals; Périodique électronique (Descripteur de forme); Ressource Internet (Descripteur de forme); 616.861005
• DOI: 10.1111/acer.12272
• Languages: English
• ISSNs: 0145-6008

Abstract

<abstract abstract-type="main" id="acer12272-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <sec id="acer12272-sec-0001" sec-type="section"> <title>Background</title> <p>Wernicke's encephalopathy‐Korsakoff syndrome (WE‐KS) is common in alcoholics, caused by thiamine deficiency (TD; vitamin B1) and associated with lesions to the thalamus (THAL). Although TD alone can cause WE, the high incidence in alcoholism suggests that TD and ethanol (EtOH) interact.</p> </sec> <sec id="acer12272-sec-0002" sec-type="section"> <title>Methods</title> <p>Mice in control, TD, or EtOH groups alone or combined were studied after 5 or 10 days of treatment. THAL and entorhinal cortex (ENT) histochemistry and mRNA were assessed.</p> </sec> <sec id="acer12272-sec-0003" sec-type="section"> <title>Results</title> <p>Combined EtOH‐TD treatment for 5 days (EtOH‐TD5) showed activated microglia, proinflammatory gene induction and THAL neurodegeneration that was greater than that found with TD alone (TD5), whereas 10 days resulted in marked THAL degeneration and microglial‐neuroimmune activation in both groups. In contrast, 10 days of TD did not cause ENT degeneration. Interestingly, in ENT, TD10 activated microglia and astrocytes more than EtOH‐TD10. In THAL, multiple astrocytic markers were lost consistent with glial cell loss. TD blocks glucose metabolism more than acetate. Acetate derived from hepatic EtOH metabolism is transported by monocarboxylic acid transporters (MCT) into both neurons and astrocytes that use acetyl‐CoA synthetase (AcCoAS) to generate cellular energy from acetate. MCT and AcCoAS expression in THAL is lower than ENT prompting the hypothesis that focal THAL degeneration is related to insufficient MCT and AcCoAS in THAL. To test this hypothesis, we administered glycerin triacetate (GTA) to increase blood acetate and found it protected the THAL from TD‐induced degeneration.</p> </sec> <sec id="acer12272-sec-0004" sec-type="section"> <title>Conclusions</title> <p>Our findings suggest that EtOH potentiates TD‐induced THAL degeneration through neuroimmune gene induction. The findings support the hypothesis that TD deficiency inhibits global glucose metabolism and that a reduced ability to process acetate for cellular energy results in THAL focal degeneration in alcoholics contributing to the high incidence of Wernicke‐Korsakoff syndrome in alcoholism.</p> </sec> </abstract>