Abstract:
:Maternal infection during pregnancy increases the risk of neurodevelopmental conditions such as autism spectrum disorders and schizophrenia in offspring. Several previous animal studies have indicated that maternal immune activation (MIA), rather than a specific pathogen, alters fetal brain development. Among them, prenatal exposure to interleukin-6 (IL-6) has been associated with behavioral and neuropathological abnormalities, though such findings remain to be elucidated in humans. We developed a human cell-based model of MIA by exposing human induced pluripotent stem cells (hiPSCs)-derived neural aggregates to IL-6 and investigated whether luteolin-a naturally occurring flavonoid found in edible plants-could prevent MIA-induced abnormalities. We generated neural aggregates from hiPSCs using the serum-free floating culture of embryoid body-like aggregates with quick reaggregation (SFEBq) method, following which aggregates were cultured in suspension. We then exposed the aggregates to IL-6 (100ng/ml) for 24h at day 51. Transient IL-6 exposure significantly increased the area ratio of astrocytes (GFAP-positive area ratio) and decreased the area ratio of early-born neurons (TBR1-positive or CTIP2-positive area ratio) relative to controls. In addition, western blot analysis revealed that levels of phosphorylated STAT3 were significantly elevated in IL-6-exposed neural aggregates. Luteolin treatment inhibited STAT3 phosphorylation and counteracted IL-6-mediated increases of GFAP-positive cells and reductions of TBR1-positive and CTIP2-positive cells. Our observations suggest that the flavonoid luteolin may attenuate or prevent MIA-induced neural abnormalities. As we observed increased apoptosis at high concentrations of luteolin, further studies are required to determine the optimal intake dosage and duration for pregnant women.
journal_name
Neurosci Lettjournal_title
Neuroscience lettersauthors
Zuiki M,Chiyonobu T,Yoshida M,Maeda H,Yamashita S,Kidowaki S,Hasegawa T,Gotoh H,Nomura T,Ono K,Hosoi H,Morimoto Mdoi
10.1016/j.neulet.2017.06.004subject
Has Abstractpub_date
2017-07-13 00:00:00pages
296-301eissn
0304-3940issn
1872-7972pii
S0304-3940(17)30484-6journal_volume
653pub_type
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