Objective To study optical intrinsic signal (OIS) imaging of peri-infarct depolarizations (PIDs) in mice and investigate the influence of knockout of glial fibrillary acidic protein and vimentin on PIDs. Methods GFAP-/-Vim-/-mice and GFAP+/+Vim+/+mice were subjected to MCAO by standard intraluminal filament method. The main characteristics of PIDs in 4 h were studied by 4-wavelength OIS imaging technique. Results PIDs were identified as consistent, red and blue interaction waves in the cortical reflectance that slowly propagated peripherally from the origin site. There were 5 patterns of PID propagation, namely rostro-caudal, latero-medial, caudo-rostral, contralateral and medial-lateral. No significant differences were found in PID frequency, propagation patterns, velocity or duration time between the two groups (P>0.05). Conclusion The 4-wavelength OIS system allows acquisition of high temporal-spatial resolution color images for analyzing temporal-spatial characteristics of PIDs in detail. Knockout of GFAP and vimentin do not affect PIDs in 4 h following middle cerebral artery occlusion.%目的:觀測小鼠腦梗塞周圍擴(kuò)散性去極化(PIDs)的內(nèi)源光信號變化特征,探索膠質(zhì)纖維酸性蛋白(GFAP)和波形蛋白(Vim)基因敲除對PIDs的影響。方法以GFAP和Vim基因敲除(GFAP-/-Vim-/-)小鼠及其野生型(GFAP+/+Vim+/+)小鼠為研究對象,線栓法制備大腦中動脈梗塞(MCAO)模型,應(yīng)用四波長內(nèi)源光信號(OIS)成像技術(shù)監(jiān)測兩組動物4 h內(nèi)PIDs的發(fā)作情況。結(jié)果 OIS成像顯示PIDs在空間分布上表現(xiàn)為連續(xù)的、紅藍(lán)相間的弧形波,由發(fā)源處向四周緩慢播散;PIDs存在5種不同空間播散類型:喙-尾播散類型、側(cè)方-內(nèi)側(cè)播散類型、尾-喙播散類型、對側(cè)播散類型和內(nèi)側(cè)-側(cè)方播散類型。GFAP-/-Vim-/-小鼠和GFAP+/+Vim+/+小鼠PIDs的發(fā)作次數(shù)、播散類型、速度及時程組間比較無統(tǒng)計學(xué)差異(P>0.05)。結(jié)論四波長OIS成像技術(shù)可獲得PIDs的高分辨率彩色影像,為更深入研究PIDs的時空特性創(chuàng)造了條件;GFAP和Vim基因敲除對MCAO模型制備后4 h內(nèi)PIDs的發(fā)作無顯著影響。
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