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Age-related changes in brain proDynorphin gene expression in the rat |
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| Authors: | Kotz Catherine M Weldon Derik Billington Charles J Levine Allen S |
| Institution: | a Veterans Affairs Medical Center, One Veterans Drive, Minneapolis, MN 55417, USA b Minnesota Obesity Center, One Veterans Drive, Minneapolis, MN 55417, USA c Department of Food Science and Nutrition, University of Minnesota, 1334 Eckles Avenue, Saint Paul, Minnesota, MN 55108, USA d Department of Psychiatry, University of Minnesota, 1334 Eckles Avenue, Saint Paul, Minnesota, MN 55108, USA e Department of Medicine, University of Minnesota, 1334 Eckles Avenue, Saint Paul, Minnesota, MN 55108, USA f College of Medicine, Iowa city, Iowa, 52242, USA |
| Abstract: | Dynorphin has a well-established role in feeding and gustation. Alterations in taste perception and feeding behavior are common with age. We hypothesized that proDynorphin gene expression in brain areas involved in taste and feeding declines with age. Male Sprague-Dawley rats were housed individually with ad libitum access to food and water. Brain punches of the selected regions were dissected out in groups of rats aged 4–6, 12–14 and 18–21 months. ProDynorphin mRNA (measured using a cDNA probe) decreased significantly with age in arcuate nucleus and amygdala; increased significantly with age in hippocampus; and was not significantly affected in nucleus of the solitary tract, cortex, caudate putamen or hypothalamic paraventricular nucleus. These data suggest an age-related decrease in the synthesis of dynorphin in two brain regions strongly associated with feeding behavior, and an increase in dynorphin synthesis in a brain region associated with learning and memory. |
| Keywords: | Opioids Dynorphin Feeding behavior Brain Aging Aged |
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