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Drug dependence, abuse, and addiction are complex phenomena that can precipitate various abnormal states. Physical dependence refers to a state of pharmacological adaptation to a drug. This adaptation often results in tolerance—a reduced response to the drug after repeated administrations. When the drug use is abruptly stopped, withdrawal symptoms occur due to the body's need to readjust from the pharmacologically induced imbalance. However, tolerance and withdrawal symptoms do not...
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Antiepileptic Drugs: Glutamate Antagonists01:14

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Glutamate is a fundamental neurotransmitter in the central nervous system, playing a vital role in neuronal communication and various cognitive processes. Glutamate stands as the principal excitatory neurotransmitter in the brain. Its presence is crucial for the communication between neurons, underpinning essential processes such as synaptic transmission, neuronal excitability, and plasticity. These functions are vital for higher-order cognitive processes, including learning and memory. The...
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Incretins include glucagon-like peptide-1 (GLP-1) and glucose-dependent insulinotropic polypeptide (GIP), which stimulate insulin secretion post-meals. In type 2 diabetes, GIP's efficacy is reduced, making GLP-1 a viable drug target. GIP originates from preproGIP.
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Ganglionic stimulants activate NM nicotinic receptors in autonomic ganglia, falling into two categories: nicotine mimetics [e.g., lobeline, dimethylpiperazine, tetramethylammonium] and muscarinic receptor agonists [e.g., muscarine, methacholine]. The first category's action is rapid and blocked by nicotinic receptor antagonists, while the second category's action is delayed and blocked by atropine-like agents. Nicotine, an alkaloid, affects the heart rate by stimulating...
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Without prolonged fasting, healthy individuals maintain blood glucose levels above 3.5 mM due to a well-adapted neuroendocrine counterregulatory system that effectively prevents acute hypoglycemia, a potentially life-threatening condition. The primary clinical scenarios for hypoglycemia encompass diabetes treatment, inappropriate production of endogenous insulin or insulin-like substances by tumors, and the use of glucose-lowering agents in non-diabetic individuals. Notably, hypoglycemia in the...
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Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme...
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Related Experiment Video

Updated: Mar 29, 2026

Assessment of Glutamine as a Fuel Source for Alveolar Macrophages Exposed to Chronic Ethanol Using an Extracellular Flux Bioanalyzer
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Rethinking glutamine addiction.

Abigail S Krall1, Heather R Christofk1

  • 1UCLA, Molecular and Medical Pharmacology, 34-115 Center for Health Sciences, 650 Charles E. Young Drive South, Los Angeles, California 90095, USA.

Nature Cell Biology
|November 28, 2015
PubMed
Summary

Tumours alter metabolism for growth, but critical pathways remain unknown. Glioblastoma growth does not require glutamine anaplerosis, as glutamate fulfills its glutamine needs.

Area of Science:

  • Biochemistry
  • Cancer Metabolism
  • Oncology

Background:

  • Tumours reprogram cellular metabolism to support rapid proliferation and macromolecule biosynthesis.
  • The specific metabolic pathways essential for tumour growth are not fully elucidated.
  • Glioblastoma is an aggressive brain cancer with high metabolic demands.

Purpose of the Study:

  • To investigate the necessity of glutamine anaplerosis for glioblastoma proliferation.
  • To determine if alternative metabolic pathways can satisfy glioblastoma's glutamine requirements.

Main Methods:

  • Utilizing metabolic tracing techniques to track nutrient utilization in glioblastoma cells.
  • Analyzing the impact of inhibiting glutamine anaplerosis on cell growth and proliferation.

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Main Results:

  • Glioblastoma cells can utilize glutamate to fulfill their glutamine requirements.
  • Glutamine anaplerosis was found to be dispensable for glioblastoma growth and proliferation.
  • Metabolic reprogramming in glioblastoma can compensate for the lack of direct glutamine uptake.

Conclusions:

  • Glutamine anaplerosis is not a critical metabolic vulnerability for glioblastoma growth.
  • Alternative nutrient sources, such as glutamate, can sustain glioblastoma metabolism.
  • Targeting glutamine anaplerosis may not be an effective therapeutic strategy for glioblastoma.