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KMID : 1101720190230040032
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Physical Activity and Nutrition
2019 Volume.23 No. 4 p.32 ~ p.35
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The effects of peripherally-subacute treatment with irisin on hippocampal dendritogenesis and astrocyte-secreted factors
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Kim Mun-Hee
Leem Yea-Hyun
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Abstract
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Purpose: Fibronectin type III domain containing 5 (FNDC5)/irisin is an exercise-induced myokine, which contributes to cognitive functions. However, the relationship between the neuroprotective effects of FNDC5/irisin and hippocampal dendritic remodeling and astrocyte-secreted factors remains unclear. Therefore, we explored whether subchronic recombinant irisin treatment affected hippocampal morphology and some astrocyte-derived molecules.
Methods: Mice were intraperitoneally injected with irisin (0.5 μg/kg/day) for seven days, followed by their sacrifice two days later. Hippocampal morphometric parameters were analyzed and pgc-1a, fndc5, bdnf, and some astrocyte-derived factors mRNA levels were measured.
Results: Dendritic length, arborization, and spine density were enhanced by irisin regimen in hippocampal CA1 and CA3 areas. Hippocampal pgc-1a, fndc5, and bdnf mRNA levels were significantly increased by irisin treatment. Moreover, hevin mRNA levels were significantly enhanced, whereas tgf-b1 levels downregulated by irisin treatment.
Conclusion: FNDC5/irisin has dendritogenic activity probably through hevin induction and TGF-β1 suppression.
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KEYWORD
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FNDC5/irisin, dendritic remodeling, hippocampus, hevin, TGF-β1
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