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Delta opioid peptides derived from plant proteins
M Yoshikawa1, M Takahashi, S Yang
1Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Uji, Kyoto 611-0011, Japan. yosikawa@kais.kyoto-u.ac.jp
Current Pharmaceutical Design
|May 29, 2003
Summary
Plant-derived opioid peptides, gluten exorphins and rubiscolins, were identified. Specific peptides enhanced learning and memory in mice at lower doses than those needed for pain relief.
Area of Science:
- Biochemistry
- Neuroscience
- Food Science
Background:
- Opioid peptides are known for their roles in pain modulation.
- Plant-derived peptides offer a potential alternative source for bioactive compounds.
Purpose of the Study:
- To isolate and characterize novel opioid peptides from plant proteins.
- To investigate the cognitive effects of these plant-derived opioid peptides.
Main Methods:
- Enzymatic digestion of wheat gluten and spinach Rubisco.
- Isolation and identification of five gluten exorphins and two rubiscolins.
- Assessment of learning performance using a passive avoidance test in mice.
Main Results:
- Gluten exorphin A5 and rubiscolin-6 were identified as delta-selective opioid peptides.
- Both gluten exorphin A5 and rubiscolin-6 improved learning performance in mice.
- Effective doses for cognitive enhancement were lower than those for antinociceptive effects.
Conclusions:
- Plant proteins are a source of novel opioid peptides with potential nootropic effects.
- Gluten exorphins and rubiscolins may represent a new class of cognitive enhancers.
- Further research into plant-derived peptides for neurological applications is warranted.