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Dodd GT, Williams SR, Luckman SM: Functional magnetic resonance imaging and c-Fos mapping in rats following a glucoprivic dose of 2-deoxy-D-glucose. J Neurochem. 2010 Mar 17.
The glucose analogue, 2-deoxy-D-glucose (2-DG) is an inhibitor of glycolysis and, when administered systemically or centrally, induces glucoprivation leading to counter-regulatory responses, including increased feeding behaviour. Investigations into how the brain responds to glucoprivation could have important therapeutic potential, as disruptions or defects in the defence of the brain's "glucostatic" circuitry may be partly responsible for pathological conditions resulting from diabetes and obesity. To define the "glucostat" brain circuitry further we have combined blood-oxygen-level-dependent (BOLD) pharmacological-challenge magnetic resonance imaging (phMRI) with whole brain c-Fos functional activity mapping to characterise brain regions responsive to an orexigenic dose of 2-DG (200 mg/kg; s.c.). For phMRI, rats were imaged using a T2*-weighted gradient echo in a 7T magnet for 60 minutes under alpha-chloralose anaesthesia, while animals for immunohistochemistry were unanaesthetised and freely behaving. These complementary methods demonstrated functional brain activity in a number of previously characterised glucose-sensing brain regions such as those in the hypothalamus and brainstem following administration of 2-DG compared with vehicle. As the study mapped whole brain functional responses, it also identified the orbitofrontal cortex and striatum (nucleus accumbens and ventral pallidum) as novel 2-DG-responsive brain regions. These regions make up a corticostriatal connection with the hypothalamus, by which aspects of motivation, salience and reward can impinge on the hypothalamic control of feeding behaviour. This study, therefore, provides further evidence for a common integrated circuit involved in the induction of feeding behaviour, and illustrates the valuable potential of phMRI in investigating central pharmacological actions. |
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