Publications by authors named "K Kellar"

Aging affects virtually all organs of the body, but perhaps it has the most profound effects on the brain and its neurotransmitter systems, which influence a wide range of crucial functions, such as attention, focus, mood, neuroendocrine and autonomic functions, and sleep cycles. All of these essential functions, as well as fundamental cognitive processes such as memory, recall, and processing speed, utilize neuronal circuits that depend on neurotransmitter signaling between neurons. Glutamate (Glu), the main excitatory neurotransmitter in the CNS, is involved in most neuronal excitatory functions, including release of the neurotransmitter norepinephrine (NE).

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Article Synopsis
  • Age-related changes in neurotransmitter systems, particularly involving norepinephrine (NE), are linked to cognitive decline, highlighting the potential for therapies that enhance neurotransmission.
  • In aged Fischer 344 rats, there was a significant decrease in glutamate-stimulated NE release in areas of the brain like the hippocampus and cerebral cortex, which is mediated by NMDA receptors.
  • The psychostimulant drug amphetamine (AMPH) not only restores NE release but also improves memory function and dendritic spine maturation, suggesting that repurposing such drugs could help address cognitive deficits associated with aging.
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Inadequate intake of calcium and phosphorus during the perinatal period can result in metabolic bone disease (MBD), characterized by decreased bone mass, altered bone mineralization, and increased risk for fractures. Preterm neonates have higher risk of developing MBD. Treating MBD involves ensuring adequate calcium and phosphorus intake, early fortification, and vitamin D supplementation.

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Diffuse midline glioma (DMG), -altered are highly aggressive, incurable central nervous system (CNS) tumors. The current standard palliative treatment is radiotherapy, with most children succumbing to the disease in less than one year from the time of diagnosis. Over the past decade, there have been significant advancements in our understanding of these heterogeneous tumors at the molecular level.

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Emerging evidence suggests that there is a reduction in overall cortical excitatory to inhibitory balance in major depressive disorder (MDD), which afflicts ∼14%-20% of individuals. Reduced pyramidal cell arborization occurs with stress and MDD, and may diminish excitatory neurotransmission. Enhanced deposition of perineuronal net (PNN) components also occurs with stress.

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