L-3-n-Butylphthalide reduces ischemic stroke injury and increases M2 microglial polarization.

Abstract:

:Overwhelming evidence suggests that microglia play an important role in ischemic injury and they polarize into two different phenotypes with distinct functions after ischemic stroke. We performed the present study to investigate whether L-3-n butylphthalide (NBP) has an effect on microglial polarization. Mice were subjected to transient middle cerebral artery occlusion (MCAO) for 45 min, and then immediately after reperfusion were treated with NBP or vehicle via the caudal vein for 7 consecutive days. 2,3,5-Triphenyltetrazolium chloride (TTC) staining showed that NBP treatment resulted in a tendency to decrease cerebral infarct volume at 1 day after MCAO, and significant decreased infarct volume at 3 days after MCAO. Sensorimotor function was evaluated by the adhesive removal test and balance beam test, which were superior in NBP-treated mice compared with vehicle-treated mice at 1 and 3 days after MCAO. Immunofluorescent staining further indicated that NBP treatment significantly increased the number of CD206+/Iba1+ M2 microglia/macrophages and reduced the number of CD16+/Iba1+ M1 cells at 3 and 7 days after MCAO reperfusion. Western blot also showed an elevation of M2 marker (arginase-1) in NBP-treated brains at 7 days after MCAO. In conclusion, our results clearly show that NBP treatment significantly mitigates ischemic brain damage and promotes recovery of neurological function in early phase after ischemic stroke, probably by skewing M1 microglia/macrophages polarization towards M2 phenotype. Thus, our study provides new evidence that NBP might be a promising candidate for ameliorating injury caused by ischemic stroke.

journal_name

Metab Brain Dis

journal_title

Metabolic brain disease

authors

Li F,Ma Q,Zhao H,Wang R,Tao Z,Fan Z,Zhang S,Li G,Luo Y

doi

10.1007/s11011-018-0307-2

subject

Has Abstract

pub_date

2018-12-01 00:00:00

pages

1995-2003

issue

6

eissn

0885-7490

issn

1573-7365

pii

10.1007/s11011-018-0307-2

journal_volume

33

pub_type

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