Neurons in the corpus callosum of rats: expression of Cav2.2 and their connection / 中南大学学报(医学版)

OBJECTIVE@#To prove the existence neurons in the rat corpus callosum, the potential function of these neurons and their connection.@*METHODS@#Immunohistochemistry was used performed to examine the expressions of NeuN, a mature neuron marker,and N-type voltage-dependent valcium channel alpha1-subunit (Cav2.2)in the section of the rat corpus callosum. Horseradish peroxidase (HRP) normal sodium solution (30%), the retrograde tracer,was injected under the frontal forceps of corpus callousm and HRP absorbed by the process of neurons in the brain slices was stained with tetramethyl benzidine.@*RESULTS@#There were some NeuN positive cells in the rat corpus callosum and Cav2.2 was detected in some of these NeuN positive cells.Neurons with positive HRP were found in the rat corpus callosum and some of these neurons connected to the cortex or corpus striatum.@*CONCLUSION@#There are a few neurons in the corpus callosum of adult rats and some of them express Cav2.2. Neurons in the corpus callosum have connections with the brain cortex or corpora striatum.

Effect of ligustrazine on cell proliferation in subventricular zone in rat brain with focal cerebral ischemia-reperfusion injury / 中南大学学报(医学版)

OBJECTIVE@#To observe the effect of ligustrazine on cell proliferation in subventricular zone (SVZ) in rat brain with focal cerebral ischemia reperfusion injury.@*METHODS@#Male SD rats were randomly divided into a normal group,a sham operation group,a ligustrazine treatment group, and a control group. The ligustrazine treatment group and the control group were further divided into 5 subgroups: 1d, 3d, 7d, 14d, and 21d reperfusion after 2h middle cerebral artery occlusion (MCAO). The focal cerebral ischemia-reperfusion model was made by MCAO. S phase cells were labelled with BrdU. Immunohistochemistry method was conducted to detect the BrdU positive cells. The total number of BrdU positive cells in the SVZ was measured. The expression of neuro nitric oxide synthase (nNOS) was detected with Western blot method.@*RESULTS@#There was a significant increase of BrdU positive cells in SVZ of ligustrazine treatment in the 1d and 3d group compared with that of the control group (P<0.01). The total number of BrdU positive cells reached a peak in 7d group and declined afterwards. Cells proliferated also in SVZ on the contralateral side, and peaked at 7d. The nNOS expression of ligustrazine administration after the focal cerebral ischemia-reperfusion decreased at 1d and 3d after the reperfusion compared with that of the control group (P<0.05), and increased at 7d, but with no significant difference compared with that of the control group.@*CONCLUSION@#Ligustrazine may promote the cell proliferation in SVZ of adult rats with ischemia-reperfusion injury by decreasing the nNOS expression.

Effect of ligustrazine on nNOS expression and neuranagenesis in adult rats after cerebral ischemia-reperfusion injury / 南方医科大学学报

<p><b>OBJECTIVE</b>To observe the effect of ligustrazine on cell proliferation in the subventricular zone (SVZ) and dentate gyrus (DG) and nNOS expression in rat brain after cerebral ischemia-reperfusion injury.</p><p><b>METHODS</b>Male SD rats were randomly divided into normal control group, sham operation group, model group and ligustrazine treatment group. The latter two groups were further divided into 5 subgroups for observation at 1, 3, 7, 14 and 21 days after reperfusion following a 2-hour middle cerebral artery occlusion (MCAO). The cells in S phase were labeled with BrdU, and immunohistochemistry was employed to detect BrdU- and nNOS-positive cells. The numbers of BrdU-positive cells in the SVZ and DG were measured. The expression of nNOS was detected by Western blotting.</p><p><b>RESULTS</b>nNOS expression increased significantly in the model group as compared to the sham operation group (P<0.05), and ligustrazine treatment significantly lowered the expression level in comparison with the model group (P<0.05). Compared with the model group, a significant increase in BrdU-positive cells occurred in the SVZ of rats 1 and 3 days after igustrazine treatment (P<0.05), along with an increase of DG BrdU-positive cells.</p><p><b>CONCLUSION</b>Ligustrazine significantly restrains ischemia-reperfusion injury-induced nNOS activity enhancement and promotes cell proliferation in the SVZ and DG of adult rats after ischemia-reperfusion injury.</p>