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Related Experiment Videos

Cytokines regulate IGF binding proteins in the cns

T L Wood1, S L O'Donnell, S W Levison

  • 1Department of Neuroscience and Anatomy, Penn State University College of Medicine, Hershey 17033, USA.

Progress in Growth Factor Research
|January 1, 1995
PubMed
Summary

Central nervous system (CNS) injury induces insulin-like growth factor binding proteins (IGFBPs). Cytokines like CNTF and IL-1 beta specifically induce IGFBP2 mRNA, suggesting a unique regulatory role in CNS injury responses.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biochemistry

Background:

  • Central nervous system (CNS) trauma triggers growth factor responses, including insulin-like growth factors (IGFs) and IGF binding proteins (IGFBPs).
  • IGFBPs are implicated in neuroprotection and are hypothesized to facilitate IGF transport to injured cells.
  • The specific inducers of IGFBP expression following CNS injury remain largely unknown.

Purpose of the Study:

  • To investigate whether ciliary neurotrophic factor (CNTF) and interleukin-1 beta (IL-1 beta), known CNS injury signals, induce IGFBP expression in the brain.
  • To determine the specific IGFBP subtypes regulated by these cytokines following CNS injury.

Main Methods:

  • Adult rats received intracerebral injections of CNTF or IL-1 beta into the neocortex.

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  • Messenger RNA (mRNA) expression levels of various IGFBP subtypes were measured and compared to the contralateral control side.

    • Main Results:

    • IGFBP-2 mRNA demonstrated a significant increase within 24-48 hours after both CNTF and IL-1 beta injections.
    • Neither CNTF nor IL-1 beta affected the expression of IGFBP-3, IGFBP-5, IGFBP-4, or IGFBP-6 mRNA.
    • IGFBP-2 mRNA induction was specific to the cytokine-injected side compared to the heat-inactivated control.

    Conclusions:

    • IGFBP-2 is uniquely regulated among IGFBPs in the CNS.
    • Cytokines associated with CNS injury, such as CNTF and IL-1 beta, are potent inducers of IGFBP-2.
    • These findings highlight a specific molecular pathway involved in the brain's response to injury.