Interleukin-1beta release in the supraoptic nucleus area during osmotic stimulation requires neural function
1Department of Neural and Behavioral Sciences, Penn State College of Medicine, Hershey, PA 17033, USA. jsl2@psu.edu
Journal of Neuroendocrinology
|August 30, 2008
Summary
Interleukin-1beta is released from magnocellular neurones in the supraoptic nucleus during osmotic challenges. This cytokine release depends on intracellular calcium and voltage-gated channels, facilitating neurohypophysial hormone secretion.
Area of Science:
- Neuroendocrinology
- Cytokine Signaling
- Neurophysiology
Background:
- Interleukin (IL)-1beta is found in the magnocellular neuroendocrine system.
- IL-1beta co-depletes with oxytocin and vasopressin during salt-loading.
- The role of IL-1beta release from magnocellular neurones during osmotic stimulation is unclear.
Purpose of the Study:
- To investigate whether IL-1beta is released from magnocellular neurone dendrites/soma during osmotic stimulation.
- To determine the mechanisms underlying IL-1beta release in the supraoptic nucleus (SON).
Main Methods:
- Microdialysis adjacent to the SON in conscious rats.
- Immunocapillary electrophoresis and laser-induced fluorescence detection for cytokine quantification.
- Inhibition of voltage-gated Na+ and Ca2+ channels, and intracellular Ca2+ stores.
- Immunohistochemistry to localize cytokine sources and microglia.
Main Results:
- Basal release of IL-1beta was measurable and stable in the SON area, originating from microglia and magnocellular neurones.
- Osmotic stimulation increased IL-1beta release in SON dialysates.
- IL-1beta release was dependent on intracellular Ca2+ stores and voltage-gated Na+ and Ca2+ channels.
Conclusions:
- Osmotic stimulation triggers the release of IL-1beta from magnocellular neurones in the SON.
- This release mechanism involves intracellular Ca2+ stores and voltage-gated ion channels.
- IL-1beta release likely enhances osmosensitive cation currents, facilitating neurohypophysial hormone release.
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