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Acute-phase cytokines IL-1beta and TNF-alpha in brain development
K M Dziegielewska1, J E Møller, A M Potter
1Anatomy and Physiology, University of Tasmania, Hobart, Australia. katarzyna.dziegielewska@utas.edu.au
Cell and Tissue Research
|April 20, 2000
Summary
Tumor necrosis factor-alpha (TNF-alpha) and interleukin-1 beta (IL-1beta) show distinct temporal and spatial patterns in the developing sheep brain. Their distribution differs from fetuin, suggesting fetuin
Area of Science:
- Neuroscience
- Immunology
- Developmental Biology
Background:
- The nervous and immune systems share signaling molecules.
- Cytokines like TNF-alpha and IL-1beta play roles in development and function.
- Fetuin is a glycoprotein that modulates cytokine production.
Purpose of the Study:
- To investigate the temporal and spatial distribution of TNF-alpha and IL-1beta in the developing sheep neocortex.
- To compare cytokine distribution with fetuin distribution.
- To understand the role of these molecules in early brain development.
Main Methods:
- Immunoreactivity studies using antibodies against TNF-alpha, IL-1beta, and fetuin.
- Analysis of tissue sections from embryonic sheep neocortex at various developmental stages (E30-E140).
Main Results:
- TNF-alpha and IL-1beta appeared at different embryonic stages (E30 and E35-40, respectively).
- Cytokine distribution differed from fetuin, particularly in the cortical plate.
- IL-1beta was found in neuronal and microglial cells, while TNF-alpha expression diminished over time.
- By late gestation, cytokine-positive cells were sparse and did not overlap with fetuin.
Conclusions:
- Fetuin's proposed opsonizing role in cytokine production may not apply to the developing brain.
- Early neocortical development involves TNF-alpha and IL-1beta in the subplate zone during synaptogenesis.