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Changes in CCK mRNA in hippocampal neurones following fimbria fornix transection

M K Panni1, V J Wilson, U Capoor

  • 1MRC Cambridge Centre for Brain Repair, University of Cambridge, UK.

Neuroreport
|June 27, 1994
PubMed

Insights

Transecting septohippocampal fibers reduced preprocholecystokinin (CCK) mRNA in hippocampal interneurons. This suggests that afferent input influences CCK gene expression in these denervated cells.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cell Biology

Background:

  • The hippocampus plays a crucial role in learning and memory.
  • Interneurons are key regulators of hippocampal network activity.
  • The neuropeptide cholecystokinin (CCK) is found in a subset of hippocampal interneurons.

Purpose of the Study:

  • To investigate the effect of axotomizing lesions on preprocholecystokinin (CCK) mRNA expression in hippocampal interneurons.
  • To determine if afferent septohippocampal input modulates CCK mRNA levels in these neurons.

Main Methods:

  • Transection of afferent septohippocampal fibers in the fimbria fornix.
  • Measurement of preprocholecystokinin (CCK) mRNA expression in hippocampal interneurons using in situ hybridization (implied).
  • Comparison of CCK mRNA levels between the lesioned (ipsilateral) and unlesioned (contralateral) sides of the hippocampus.

Main Results:

  • CCK mRNA levels were significantly decreased in hippocampal interneurons on the side ipsilateral to the fimbria fornix lesion two weeks after surgery.
  • A significant reduction in CCK mRNA expression was observed in denervated target cells.

Conclusions:

  • Axotomizing lesions can alter gene expression in denervated target neurons.
  • Afferent septohippocampal input plays a modulatory role in regulating CCK mRNA levels within hippocampal interneurons.

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