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1.重庆医科大学,基础医学院放射医学教研室,重庆
2.重庆医科大学,基础医学院组织与胚胎学教研室,重庆
3.重庆医科大学,实验教学管理中心,重庆
肖倩, E-mail:296564965@qq.com
收稿:2025-11-06,
修回:2026-01-11,
录用:2026-01-16,
纸质出版:2026-02-28
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游娅君,陈艳,黄杜娟,等.选择性过表达海马CB1R缓解慢性应激诱导的神经发生减弱及行为学损伤[J].陆军军医大学学报,2026,48(04):394-406.DOI:10.16016/j.2097-0927.202511032.
YOU Y J,CHEN Y,HUANG D J,et al.Selective overexpression of hippocampal CB1R alleviates chronic stress-induced neurogenesis impairment and behavior disorder in rats[J].J Army Med Univ,2026,48(04):394-406.DOI:10.16016/j.2097-0927.202511032.
游娅君,陈艳,黄杜娟,等.选择性过表达海马CB1R缓解慢性应激诱导的神经发生减弱及行为学损伤[J].陆军军医大学学报,2026,48(04):394-406.DOI:10.16016/j.2097-0927.202511032. DOI:
YOU Y J,CHEN Y,HUANG D J,et al.Selective overexpression of hippocampal CB1R alleviates chronic stress-induced neurogenesis impairment and behavior disorder in rats[J].J Army Med Univ,2026,48(04):394-406.DOI:10.16016/j.2097-0927.202511032. DOI:
目的
2
探究选择性过表达海马大麻素受体1(cannabinoid receptor 1,CB1R)对应激大鼠海马齿状回内新生细胞、新生成熟神经元的影响。
方法
2
将32只6~8周龄雄性SD大鼠(体质量180~220 g),按照随机抽样法分为对照(Control)组(
n
=10)和应激(Stress)组(
n
=22)。其中Stress组接受慢性束缚应激(chronic restraint stress,CRS)干预3周后,按随机抽样法抽取11只大鼠作为选择性过表达海马大麻素受体1(Stress+CB1R-OE)组,利用脑立体定位注射技术对Stress+CB1R-OE组大鼠海马体内注射CB1R过表达腺相关病毒,Control组和Stress组注射空载腺相关病毒,分别命名为Control+AAV-NC、Stress+AAV-NC组,病毒转染持续3周。实验进行的第1~7周的每周日上午检测各组大鼠体质量。采用新环境进食抑制实验评估各组大鼠的行为学水平。采用免疫荧光染色法检测各组大鼠海马齿状回(dentate gyrus,DG)内5-溴-2’-脱氧尿苷(5-bromo-2’-deoxyuridine,BrdU)、神经元核抗原(neuronal nuclei,NeuN)、CB1R的表达(
n
=5,每只取3片切片),采用激光共聚焦显微镜扫描,Imaris软件计算海马齿状回单位体积内BrdU
+
、BrdU
+
/NeuN
+
细胞密度,Image J软件测定海马齿状回CB1R及NeuN平均荧光强度。采用Western blot检测各组大鼠海马体内CB1R的蛋白表达水平。
结果
2
连续3周CRS干预后,Stress+AAV-NC组大鼠体质量显著低于Control+AAV-NC组(
P
=0.001),3周的选择性过表达海马CB1R对Stress+CB1R-OE组大鼠体质量增长具有一定作用,但Stress+CB1R-OE组大鼠体质量仍显著低于Control+AAV-NC组大鼠(
P
=0.004)。新环境进食抑制测试结果显示,与Control+AAV-NC组相比,Stress+AAV-NC组大鼠的进食潜伏期显著延长(
P
<
0.001),2组大鼠在5 min内的进食能力无显著差异。在选择性过表达海马CB1R后,Stress+CB1R-OE组进食潜伏期显著缩短(
P
=0.039),3组大鼠进食能力无显著差异。免疫荧光结果显示,与Control+AAV-NC组相比,Stress+AAV-NC组大鼠海马齿状回内CB1R
+
细胞荧光光度值显著减弱(
P
=0.008)。选择性过表达海马CB1R后,与Stress+AAV-NC组比较,Stress+CB1R-OE组大鼠海马齿状回内CB1R
+
平均荧光强度显著增强(
P
<
0.001)。Western blot结果显示,与Control+AAV-NC组相比,Stress+AAV-NC组大鼠海马内CB1R蛋白表达水平显著降低(
P
=0.001)。与Stress+AAV-NC组相比,Stress+CB1R-OE组大鼠海马CB1R表达水平显著增加(
P
<
0.001)。与Control+AAV-NC组相比,Stress+AAV-NC组大鼠海马齿状回中BrdU
+
新生细胞密度减少(
P
=0.003)、BrdU
+
/NeuN
+
的新生成熟神经元密度减少(
P
=0.001)。选择性过表达海马CB1R后,Stress+CB1R-OE组大鼠海马齿状回内BrdU
+
密度显著增加(
P
=0.035)、BrdU
+
/NeuN
+
的密度显著增多(
P
=0.028),3组大鼠海马齿状回内NeuN
+
的平均荧光
强度无显著差异。
结论
2
选择性过表达海马CB1R能够缓解应激介导的大鼠海马神经发生减弱,进而改善应激大鼠的行为学损伤。
Objective
2
To investigate the effects of selective overexpression of hippocampal cannabinoid receptor 1 (CB1R) on newly generated cells and newly matured neurons in the hippocampus of stress-induced rats.
Methods
2
Thirty-two 6-8 week-old male SD rats (body weight 180 to 220 g) were randomly assigned to a Control group (
n
=10) and a Stress group (
n
=22). After the Stress group underwent 3 weeks of chronic restraint stress (CRS)
11 rats were randomly selected to form the Stress+CB1R-OE group
receiving hippocampal injections of an adeno-associated virus (AAV) for CB1R overexpression
via
stereotaxic surgery. The Control group and the remaining Stress group received a null AAV
designated as Control+AAV-NC and Stress+AAV-NC groups
respectively; viral transfection lasted 3 weeks. Body weight was measured every Sunday morning for weeks 1 to 7. Behavioral levels were assessed using the novel environment feeding suppression test. Immunofluorescence staining was used to detect the expression of 5-bromo-2'-deoxyuridine (BrdU)
Neuronal Nuclei (NeuN)
and CB1R in the hippocampal dentate gyrus (DG) (
n
=5 per group
3 slices per rat). A NOVEL confocal microscope was used for scanning. Imaris software calculated the density of BrdU⁺ and BrdU⁺/NeuN⁺ cells per unit volume in the DG
while Image J software measured the mean fluorescence intensity of CB1R and NeuN in the DG. Western blot assay was used to detect hippocampal CB1R protein expression levels.
Results
2
After 3 weeks of CRS
the body weight of the Stress+AAV-NC group was significantly lower than that of the Control+AAV-NC group (
P
=0.001). Selective hippocampal CB1R overexpression for 3 weeks partially ameliorated body weight gain in the Stre
ss+CB1R-OE group
but their weight remained significantly lower than the Control+AAV-NC group (
P
=0.004). The novel environment feeding suppression test showed that compared to the Control+AAV-NC group
the Stress+AAV-NC group had a significantly prolonged feeding latency (
P
<
0.001)
with no significant difference in feeding amount within 5 min. After selective CB1R overexpression
the Stress+CB1R-OE group showed a significantly shortened feeding latency (
P
=0.039)
with no significant differences in feeding amount among the three groups. Immunofluorescence results indicated that compared to the Control+AAV-NC group
the Stress+AAV-NC group had a significantly reduced mean fluorescence intensity of CB1R⁺ cells in the DG (
P
=0.008). After selective CB1R overexpression
the Stress+CB1R-OE group showed a significantly increased mean CB1R fluorescence intensity in the DG compared to the Stress+AAV-NC group (
P
<
0.001). Western blotting results showed that hippocampal CB1R protein expression was significantly lower in the Stress+AAV-NC group than in the Control+AAV-NC group (
P
=0.001). Compared to the Stress+AAV-NC group
the Stress+CB1R-OE group had a significantly increased hippocampal CB1R expression level (
P
<
0.001). Compared to the Control+AAV-NC group
the Stress+AAV-NC group had reduced densities of BrdU⁺ newborn cells (
P
=0.003) and BrdU⁺/NeuN⁺ newly matured neurons (
P
=0.001) in the DG. After selective CB1R overexpression
the Stress+CB1R-OE group showed significantly increased densities of BrdU⁺ cells (
P
=0.035) and BrdU⁺/NeuN⁺ neurons (
P
=0.028) in the DG. No significant difference was observed in the mean NeuN fluorescence intensity in the DG among the three groups.
Conclusion
2
Selective overexpression of hippocampal CB1R can alleviate stress-mediated reduction in hippocampal neurogenesis and subsequently improve behavioral deficits in stress-induced rats.
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