Niaspan reduces high-mobility group box 1/receptor for advanced glycation endproducts after stroke in type-1 diabetic rats.

Abstract:

OBJECTIVE:High-mobility group box 1 (HMGB1), an active receptor for advanced glycation endproducts (RAGE), functions as a potent proinflammatory cytokine-like factor that contributes to the pathogenesis of vasculature. Diabetes mellitus (DM) is associated with accelerated development of both microvascular and macrovascular disease and increases the risk of ischemic stroke. Using a model of streptozotocin-induced type-1 diabetes (T1DM) in rats, we investigated the changes in HMGB and RAGE and tested the effects of Niaspan, a slow release form of niacin, on the expression of pro-inflammatory proteins in rats after stroke. RESEARCH DESIGN AND METHODS:T1DM rats were subjected to transient middle cerebral artery occlusion (MCAo) and treated without or with Niaspan (40 mg/kg) daily for 14 days after MCAo. Non-streptozotocin rats (WT) were also subjected to MCAo. Immunostaining for inflammatory mediators including HMGB1, RAGE, matrix metalloproteinase-9 (MMP-9) and toll-like receptor 4 (TLR4) immunostaining (n=8/group) and Western blotting (n=4/group) were performed. RESULTS:Compared to WT-MCAo rats, T1DM-MCAo rats showed an increased expression of HMGB1 (0.82±0.07 vs. 1.81±0.98, P<0.05), RAGE (1.31±0.22 vs. 3.77±0.72, P<0.05), MMP-9 (0.74±0.08 vs. 1.61±0.09, P<0.05) and TLR4 (2.85±0.22 vs. 6.72±0.44, P<0.05) after stroke. Niaspan treatment significantly attenuated the expression of HMGB1 (1.80±0.98 vs. 1.31±0.01, P<0.05), RAGE (3.77±0.71 vs. 1.78±0.45, P<0.05), MMP-9 (1.61±0.09 vs. 0.97±0.07, P<0.05) and TLR4 (6.72±0.44 vs. 2.28±0.43, P<0.05) in the ischemic brain in T1DM-MCAo rats. CONCLUSIONS:T1DM increases HMGB1/RAGE, TLR4 and MMP-9 expression after stroke. Niaspan treatment of stroke in T1DM rats inhibits HMGB1/RAGE, TLR4 and MMP-9 expression which may contribute to the reduced inflammatory response after stroke in T1DM rats.

journal_name

Neuroscience

journal_title

Neuroscience

authors

Ye X,Chopp M,Liu X,Zacharek A,Cui X,Yan T,Roberts C,Chen J

doi

10.1016/j.neuroscience.2011.06.004

subject

Has Abstract

pub_date

2011-09-08 00:00:00

pages

339-45

eissn

0306-4522

issn

1873-7544

pii

S0306-4522(11)00662-2

journal_volume

190

pub_type

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