NDP-MSH binding melanocortin-1 receptor ameliorates neuroinflammation and BBB disruption through CREB/Nr4a1/NF-κB pathway after intracerebral hemorrhage in mice

Neuroinflammation and blood-brain barrier (BBB) disruption are two vital mechanisms of secondary brain injury following intracerebral hemorrhage (ICH). Recently, melanocortin-1 receptor (Mc1r) activation by Nle4-D-Phe7-α-MSH (NDP-MSH) was shown to play a neuroprotective role in an experimental autoi...

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Published in:	Journal of neuroinflammation 2019-10, Vol.16 (1), p.192-192, Article 192
Main Authors:	Wu, Xuan, Fu, Siming, Liu, Yun, Luo, Hansheng, Li, Feng, Wang, Yiying, Gao, Meng, Cheng, Yuan, Xie, Zongyi
Format:	Article
Language:	eng
Subjects:	alpha-MSH - analogs & derivatives alpha-MSH - metabolism alpha-MSH - pharmacology alpha-MSH - therapeutic use Animals Blood-brain barrier Blood-Brain Barrier - drug effects Blood-Brain Barrier - metabolism Brain - drug effects Brain - metabolism Cerebral Hemorrhage - metabolism Cyclic AMP Response Element-Binding Protein - metabolism Intracerebral hemorrhage Male Mc1r Mice Mice, Inbred C57BL NDP-MSH Neuroinflammation NF-kappa B - metabolism Nr4a1 Nuclear Receptor Subfamily 4, Group A, Member 1 - metabolism Protein Binding - drug effects Protein Binding - physiology Receptor, Melanocortin, Type 1 - metabolism Signal Transduction - drug effects Signal Transduction - physiology
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Summary:	Neuroinflammation and blood-brain barrier (BBB) disruption are two vital mechanisms of secondary brain injury following intracerebral hemorrhage (ICH). Recently, melanocortin-1 receptor (Mc1r) activation by Nle4-D-Phe7-α-MSH (NDP-MSH) was shown to play a neuroprotective role in an experimental autoimmune encephalomyelitis (EAE) mouse model. This study aimed to investigate whether NDP-MSH could alleviate neuroinflammation and BBB disruption after experimental ICH, as well as the potential mechanisms of its neuroprotective roles. Two hundred and eighteen male C57BL/6 mice were subjected to autologous blood-injection ICH model. NDP-MSH, an agonist of Mc1r, was administered intraperitoneally injected at 1 h after ICH insult. To further explore the related protective mechanisms, Mc1r small interfering RNA (Mc1r siRNA) and nuclear receptor subfamily 4 group A member 1 (Nr4a1) siRNA were administered via intracerebroventricular (i.c.v) injection before ICH induction. Neurological test, BBB permeability, brain water content, immunofluorescence staining, and Western blot analysis were implemented. The Expression of Mc1r was significantly increased after ICH. Mc1r was mainly expressed in microglia, astrocytes, and endothelial cells following ICH. Treatment with NDP-MSH remarkably improved neurological function and reduced BBB disruption, brain water content, and the number of microglia in the peri-hematoma tissue after ICH. Meanwhile, the administration of NDP-MSH significantly reduced the expression of p-NF-κB p65, IL-1β, TNF-α, and MMP-9 and increased the expression of p-CREB, Nr4a1, ZO-1, occludin, and Lama5. Inversely, the knockdown of Mc1r or Nr4a1 abolished the neuroprotective effects of NDP-MSH. Taken together, NDP-MSH binding Mc1r attenuated neuroinflammation and BBB disruption and improved neurological deficits, at least in part through CREB/Nr4a1/NF-κB pathway after ICH.
ISSN:	1742-2094 1742-2094