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Mast cells modulate maintained neuronal activity in the thalamus in vivo

Péter Kovács1, István Hernádi, Márta Wilhelm

  • 1University of Pécs, Department of Experimental Zoology and Neurobiology, 6 Ifjúság str., H-7624, Pécs, Hungary. pkovacs@gamma.ttk.pte.hu

Journal of Neuroimmunology
|November 23, 2005
PubMed

Insights

Intracranial mast cells influence thalamic neuronal activity. Mast cell activation by compound 48/80 altered neuronal firing rates in the thalamus, but not in the cortex or hippocampus.

Area of Science:

  • Neuroscience
  • Cell Biology

Background:

  • Mast cells are immune cells found throughout the body, including the brain.
  • Their role in modulating neuronal activity, particularly in the thalamus, is not fully understood.

Purpose of the Study:

  • To investigate the involvement of intracranial mast cells in modifying thalamic neuronal activity.
  • To determine the effect of mast cell activation on neuronal firing rates in different brain regions.

Main Methods:

  • Single cell unit activity of 187 neurons from 24 rats was recorded.
  • Mast cells were activated using microiontophoretical application of compound 48/80.
  • Neuronal firing rates in the thalamus, cortex, and hippocampus were analyzed.
  • Anatomical evaluation was performed to identify degranulated mast cells in recorded areas.

Main Results:

  • Compound 48/80 application did not affect neuronal firing rates in the cortex or hippocampus, areas lacking mast cells.
  • In the thalamus, mast cell activation led to neuronal excitation in 70% of females and 11% of males.
  • Mast cell activation resulted in neuronal inhibition in 7% of females and 33% of males.
  • Degranulated mast cells were observed in the recorded thalamic areas.

Conclusions:

  • Intracranial mast cells can modulate thalamic neuronal activity.
  • Mast cell activation can cause both excitation and inhibition of thalamic neurons, with sex-dependent differences.
  • These findings suggest a significant role for mast cells in central nervous system function.

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