The effects of viscero-somatic interactions on thalamic mast cell recruitment in cystitic rats

A focus on mast cells and pain

Mast cells (MCs) are immunocytes with secretory functions that act locally in peripheral tissues to modulate local hemodynamics, nociceptor activation and pain. They are also able to infiltrate the central nervous system (CNS), especially the spinal cord and the thalamus, but their cerebral function remains an enigma. A role in regulating the opening of the blood-brain barrier has been proposed. Paracrine-like action of MCs on synaptic transmission might also signal a modulation of the nervous system by the immune system. In this review, we examine the link between MCs and nociceptive process, at the periphery as well as in the CNS.

Decrease of cerebral mast cell degranulation after systemic administration of lipopolysaccharide

INTRODUCTION

The mast cell is an immunocyte, but its functions in the brain remain unclear.

MATERIALS AND METHODS

In a rat model of weak inflammation, we analyzed the effect of a gram-negative bacterial lipopolysaccharide injection (100 μg/kg) on thalamic mast cell (MC) population.

CONCLUSION

We demonstrate a significant decrease of their degranulation, which suggests the implication of MC in preventing sepsis on the brain.