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Cell Specific Gene Expression01:58

Cell Specific Gene Expression

Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...

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Assaying Circuit Specific Regulation of Adult Hippocampal Neural Precursor Cells
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Published on: July 24, 2019

Caffeine modulates CREB-dependent gene expression in developing cortical neurons.

Sean Connolly1, Tami J Kingsbury

  • 1Department of Physiology, University of Maryland School of Medicine, Baltimore, MD, USA.

Biochemical and Biophysical Research Communications
|May 25, 2010
PubMed
Summary

Caffeine stimulates the Ca(2+)/cAMP response element binding protein (CREB) pathway in developing neurons, enhancing the transcription of essential genes like brain-derived neurotrophic factor (BDNF). This effect may explain caffeine's neurological benefits in infants.

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Published on: October 2, 2018

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Pharmacology

Background:

  • The Ca(2+)/cAMP response element binding protein (CREB) is crucial for central nervous system development and function.
  • Caffeine is widely used, particularly in premature infants, but its precise molecular effects on developing neurons require further elucidation.

Purpose of the Study:

  • To investigate caffeine's ability to stimulate CREB-dependent gene transcription in primary cultures of developing mouse cortical neurons.
  • To determine the dose-response relationship and specificity of caffeine's effects on CREB activity and target gene expression.

Main Methods:

  • Utilized a CREB-dependent reporter gene (CRE-luciferase) assay to measure CREB activity.
  • Employed quantitative real-time PCR to analyze the expression of endogenous CREB target genes, including brain-derived neurotrophic factor (BDNF).
  • Compared caffeine's effects with neuronal depolarization using high extracellular KCl.

Main Results:

  • Caffeine demonstrated a bell-shaped dose-response curve for stimulating CREB activity, with maximal effect at 10mM.
  • 10mM caffeine was more effective than 50mM KCl depolarization in stimulating CREB activity in immature neurons.
  • Caffeine treatment increased transcripts of endogenous CREB target genes, including BDNF, with gene-specific dose-response curves.
  • Caffeine enhanced CRE-luciferase activity and BDNF transcript levels under weak depolarization conditions relevant to infant treatment.

Conclusions:

  • Caffeine effectively stimulates CREB-dependent gene transcription in developing cortical neurons via a dose-dependent mechanism.
  • The observed gene-specificity highlights the role of promoter structure in mediating genomic responses to calcium signaling.
  • Caffeine's enhancement of activity-dependent BDNF expression may underlie its neurological benefits in infants.