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Functional Evaluation of Biological Neurotoxins in Networked Cultures of Stem Cell-derived Central Nervous System Neurons

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13-Deoxo-13-iminodutomycin, a new neuroprotective compound from Streptomyces sp. RAP78.

Yuta Ibusuki¹, Shoko Kimata¹, Yoichi Hayakawa²

¹Department of Medicinal and Life Science, Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510, Japan.

The Journal of Antibiotics

|November 26, 2021

Summary

A novel neuroprotective compound, 13-deoxo-13-iminodutomycin, was isolated from Streptomyces. This dutomycin derivative effectively protected neural cells from glutamate toxicity, showing significant therapeutic potential.

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Area of Science:

Natural Product Chemistry
Neuropharmacology
Microbiology

Background:

Glutamate excitotoxicity is a key mechanism in neuronal damage.
Streptomyces species are prolific producers of bioactive secondary metabolites.
Dutomycin is an antibiotic with potential biological activities.

Purpose of the Study:

To isolate and characterize novel compounds from Streptomyces sp. RAP78.
To evaluate the neuroprotective effects of isolated compounds against glutamate-induced toxicity.
To identify new therapeutic agents for neurological disorders.

Main Methods:

Isolation of compound 2 from Streptomyces sp. RAP78 culture broth.
Structure elucidation using high-resolution FAB-MS and NMR spectroscopy.
Assessment of neuroprotection in C6 rat glioma and N18-RE-105 neuroblastoma hybrid cells using glutamate toxicity assays.

Main Results:

A new dutomycin derivative, 13-deoxo-13-iminodutomycin (2), was isolated and structurally characterized.
Compound 2 demonstrated significant neuroprotection against glutamate toxicity in both cell lines.
The EC50 values for compound 2 were 0.12 µM for C6 cells and 0.72 µM for N18-RE-105 cells.

Conclusions:

13-Deoxo-13-iminodutomycin is a potent neuroprotective agent.
This compound offers a promising therapeutic avenue for conditions involving glutamate excitotoxicity.
Streptomyces sp. RAP78 is a valuable source for discovering novel neuroactive natural products.