Journal of Molecular Neuroscience

, Volume 7, Issue 3, pp 169–181 | Cite as

Regulation of brain interleukin-1β (IL-1β) system mRNAs in response to pathophysiological concentrations of IL-1β in the cerebrospinal fluid

  • Sergey E. Ilyin
  • Gayatri Sonti
  • Dave Gayle
  • Carlos R. Plata-Salamán
Original Articles


Interleukin-1β (IL-1β) is released during pathophysiological processes. IL-1β induces neurological manifestations when administered into the cerebrospinal fluid (CSF) at pathophysiological concentrations detected during central nervous system (CNS) infections and other neurological disorders. In the present study, we investigated the regulation of the IL-1β system in the CNS in response to the chronic intracerebroventricular (icv) microinfusion of IL-1β at estimated pathophysiological concentrations in the CSF. IL-1 receptor type I (IL-1RI), IL-1 receptor antagonist (IL-1Ra), and IL-1β mRNAs were determined by sensitive RNase protection assays in brain target regions for IL-1β (cerebellum, parieto-frontal cortex, hippocampus, and midbrain). The results show that chronic icv microinfusion of IL-1β induced significant anorexia, increased the cerebellar IL-1RI mRNA content, increased IL-1Ra and IL-1β mRNAs levels in the cerebellum > midbrain > cortex > hippocampus, and induced profiles of IL-1RI mRNA, IL-1Ra mRNA, and IL-1β mRNA that were highly intercorrelated. On the other hand, levels of rat glyceraldehyde 3-phosphate dehydrogenase mRNA and 18S rRNA were fairly constant, and heat-inactivated IL-1β had no effect on food intake or on IL-1RI, IL-1Ra, and IL-1β mRNAs levels in any brain region. The data suggest the operation of an IL-1β feedback system (IL-1β/IL-1Ra/IL-1RI) in brain regions. Dysregulation of the CNS IL-1β feedback system may have pathophysiological significance. This may be reflected, for example, in the pathogenicity and severity of neurological diseases, such as CNS infections.

Index Entries

Interleukin cytokine growth factor neuroimmunology immune system nervous system cerebellum hippocampus cortex midbrain feeding food intake rat intracerebroventricular cerebrospinal fluid 


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Copyright information

© Humana Press Inc 1996

Authors and Affiliations

  • Sergey E. Ilyin
    • 1
  • Gayatri Sonti
    • 1
  • Dave Gayle
    • 1
  • Carlos R. Plata-Salamán
    • 1
  1. 1.School of Life and Health SciencesUniversity of DelawareNewark

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