Abstract

The use of agents that target both glia and neurons may represent a new strategy for the treatment of ageing disorders. Here, we confirmed the presence of the novel cyclic peptide Naturido that originates from a medicinal fungus (Isaria japonica) grown on domestic silkworm (Bombyx mori). We found that Naturido significantly enhanced astrocyte proliferation and activated the single copy gene encoding the neuropeptide VGF and the neuron-derived NGF gene. The addition of the peptide to the culture medium of primary hippocampal neurons increased dendrite length, dendrite number and axon length. Furthermore, the addition of the peptide to primary microglial cultures shifted CGA-activated microglia towards anti-inflammatory and neuroprotective phenotypes. These findings of in vitro glia-neuron interactions led us to evaluate the effects of oral administration of the peptide on brain function and hair ageing in senescence-accelerated mice (SAMP8). In vivo analyses revealed that spatial learning ability and hair quality were improved in Naturido-treated mice compared with untreated mice, to the same level observed in the normal ageing control (SAMR1). These data suggest that Naturido may be a promising glia-neuron modulator for the treatment of not only senescence, but also Alzheimer's disease and other neurodegenerative diseases.

Highlights

  • Worldwide, fifty million people were living with dementia in 2018, and this number is expected to exceed 152 million by 2050 [1]

  • We first prepared I. japonica grown on silkworm pupae (Fig 1A), I. japonica powder and I. japonica powder extract produced using the protocol described in the Methods section

  • Our previous evidence suggested that the powder or the extract of I. japonica might have a potential as hopeful candidate but the active component fulfilled with both sides of glia and neurons was not identified until today [5,6,8]

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Summary

Objectives

Screening agents that target glia and neurons described above, we aimed to highlight an active component from the extract and identified a promising candidate that might successfully modulate the viability and function of glia/neurons in vitro, that we refer to as Naturido

Methods
Results
Conclusion
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