Immunoreactive somatostatin release from rat spinal cord in vitro

Area of Science:

• Neuroscience
• Neurophysiology
• Biochemistry

Background:

• Somatostatin is a peptide hormone found in the central nervous system.
• Its precise role in the spinal cord, particularly as a neurotransmitter or neuromodulator, requires further elucidation.

Purpose of the Study:

• To investigate the release of somatostatin from the rat spinal cord in vitro.
• To provide evidence for the functional role of somatostatin in the mammalian spinal cord.

Main Methods:

• Rat spinal cord tissue was used for in vitro studies.
• Depolarizing stimuli, including 60 mM KCl and 75 micrometer veratrine, were applied.
• Calcium-dependent release was measured.
• Released somatostatin was characterized using immunoassay and Sephadex G-25 (f) chromatography.

Main Results:

• A calcium-dependent release of immunoreactive somatostatin was observed in response to both KCl and veratrine stimuli.
• The released somatostatin constituted 0.53% of the total tissue content.
• Characterization confirmed the identity and behavior of the released somatostatin, consistent with synthetic somatostatin.

Conclusions:

• The findings demonstrate the release of somatostatin from the rat spinal cord in a calcium-dependent manner.
• These results strongly support a neurotransmitter or neuromodulator function for somatostatin in the mammalian spinal cord.