Objective:To investigate whether the activation of p38MAPK is involved in the neuropathic pain induced by P2X4 receptor,and the effects of activated P2X4 receptor and p38MAPK on expression of brain-derived neurotrophi...Objective:To investigate whether the activation of p38MAPK is involved in the neuropathic pain induced by P2X4 receptor,and the effects of activated P2X4 receptor and p38MAPK on expression of brain-derived neurotrophic factor (BDNF) in the chronic neuropathic pain.Methods:Lumbar intrathecal catheters were chronically implanted in male Sprague-Dawley rats.The right sciatic nerve was loosely ligated proximal to the sciatica's trifurcation at approximately 1.0 mm intervals with 4-0 silk sutures.The microglia inhibitor minocycline,P2X4 antagonist (TNP-ATP) and p38MAPK inhibitor (SB203580) were intrathecally administered every 12 h,3 d post-chronic constriction injury (CCI).Mechanical nociceptive thresholds were assessed with the paw withdrawal threshold (PWT) to von Frey filaments.The expression of P2X4 and BDNF were assessed by both immunohistochemical analysis and RT-PCR.Results:Intrathecal injection of minocycline or TNP-ATP or SB203580 significantly attenuated CCI-induced mechanical allodynia.The time courses of P2X4 receptor and BDNF expression were increased at all points after CCI and reached a peak level on postoperative d 7.Intrathecal injection of minocycline or TNP-ATP or SB203580 markedly suppressed the increase of CCI-induced P2X4 receptor and BDNF expression in the spinal cord.Conclusion:The activation of P2X4 receptor BDNF pathways contributes to neuropathic pain in CCI rats,and the activation of p38MAPK is involved in the neuropathic pain induced by P2X4 receptor.展开更多
BACKGROUND:To determine the protective role of mesencephalic astrocyte-derived neurotrophic factor(MANF) in regulating sepsis-associated acute kidney injury(S-AKI).METHODS:A total of 96 mice were randomly divided into...BACKGROUND:To determine the protective role of mesencephalic astrocyte-derived neurotrophic factor(MANF) in regulating sepsis-associated acute kidney injury(S-AKI).METHODS:A total of 96 mice were randomly divided into the control group,control+MANF group,S-AKI group,and S-AKI+MANF group.The S-AKI model was established by injecting lipopolysaccharide(LPS) at 10 mg/kg intraperitoneally.MANF(200 μg/kg) was administered to the control+MANF and S-AKI+MANF groups.An equal dose of normal saline was administered daily intraperitoneally in the control and S-AKI groups.Serum and kidney tissue samples were obtained for biochemical analysis.Western blotting was used to detect the protein expression of MANF in the kidney,and enzyme-linked immunosorbent assay(ELISA) was used to determine expression of MANF in the serum,pro-inflammatory cytokines(tumor necrosis factor-α [TNF-α] and interleukin-6 [IL-6]).Serum creatinine(SCr),and blood urea nitrogen(BUN)were examined using an automatic biochemical analyzer.In addition,the kidney tissue was observed for pathological changes by hematoxylin-eosin staining.The comparison between two groups was performed by unpaired Student’s t-test,and statistics among multiple groups were carried out using Tukey’s post hoc test following one-way analysis of variance(ANOVA).A P-value <0.05 was considered statistically significant.RESULTS:At the early stage of S-AKI,MANF in the kidney tissue was up-regulated,but with the development of the disease,it was down-regulated.Renal function was worsened in the S-AKI group,and TNF-α and IL-6 were elevated.The administration of MANF significantly alleviated the elevated levels of SCr and BUN and inhibited the expression of TNF-α and IL-6 in the kidney.The pathological changes were more extensive in the S-AKI group than in the S-AKI+MANF group.CONCLUSION:MANF treatment may significantly alleviate renal injury,reduce the inflammatory response,and alleviate or reverse kidney tissue damage.MANF may have a protective effect on S-AKI,suggesting a potential treatment for S-AKI.展开更多
Objective: To study the sequence and function of the glial cell line-derived neurotrophic factor (GDNF) transcript in subjects of Han nationality. Methods: The Han nationality GDNF transcript was amplified by RT-PCR a...Objective: To study the sequence and function of the glial cell line-derived neurotrophic factor (GDNF) transcript in subjects of Han nationality. Methods: The Han nationality GDNF transcript was amplified by RT-PCR and expressed by baculovirus expression system. Biological activity of the expressed product was measured by the primary culture of midbrain dopaminergic neurons. Results: There only existed the shorter GDNF transcript of 555 bp in the Han nationality. The secretory expression product of the shorter transcript in insect cells promoted the survival and differentiation of dopaminergic neurons. Conclusion: It is found that there is a 78 bp deletion in the Han nationality GDNF transcript compared with the reported 633 bp GDNF transcript. The 78 bp deletion does not affect the secretory expression and biological activity of GDNF mature protein.展开更多
目的研究百会穴久留针法通过脑源性神经营养因子(BDNF)/酪氨酸受体激酶B(TrkB)通路改善缺血性脑卒中小鼠神经功能的作用及机制。方法选择雄性C57BL/6J小鼠48只,随机分为假手术1组、模型1组、久留针1组、普通留针组,每组12只。后3组采用...目的研究百会穴久留针法通过脑源性神经营养因子(BDNF)/酪氨酸受体激酶B(TrkB)通路改善缺血性脑卒中小鼠神经功能的作用及机制。方法选择雄性C57BL/6J小鼠48只,随机分为假手术1组、模型1组、久留针1组、普通留针组,每组12只。后3组采用线栓法制备缺血性脑卒中模型,手术造模后第1天起久留针1组和普通留针组分别给予百会穴久留针和普通留针治疗,连续14 d。另选择雄性C57BL/6J小鼠40只,随机分为假手术2组、模型2组、久留针2组、久留针3组,每组10只。后3组采用线栓法制备缺血性脑卒中模型,针灸治疗前分别给予腺相关病毒100μl单次尾静脉注射。采用改良神经功能缺损评分(mNSS)及水迷宫实验的逃避潜伏期、目标象限停留时间、穿越原平台次数评价神经功能。结果与假手术1组比较,模型1组mNSS评分、目标象限停留时间、穿越原平台次数及缺血脑组织BDNF、TrkB表达明显降低,细胞凋亡率及裂解型半胱氨酸天冬氨酸蛋白酶3(Caspase-3)表达明显增加,差异有统计学意义(P<0.05);与模型1组比较,久留针1组和普通留针组mNSS评分、目标象限停留时间、穿越原平台次数及缺血脑组织BDNF、TrkB表达明显增加,细胞凋亡率及裂解型Caspase-3表达明显降低,且久留针1组上述变化较普通留针组更为显著,差异有统计学意义(P<0.05)。与久留针2组比较,久留针3组mNSS评分、目标象限停留时间、穿越原平台次数及缺血脑组织中BDNF表达明显降低(P<0.05),细胞凋亡率及裂解型Caspase-3表达明显增加[(16.41±2.25)%vs(7.59±1.09)%;1.46±0.16 vs 0.94±0.12,P<0.05]。结论百会穴久留针治疗对缺血性脑卒中小鼠神经功能的改善作用更为显著,激活BDNF/TrkB通路是其发挥神经保护作用的相关分子机制。展开更多
目的探讨三酰甘油-葡萄糖指数(triglyceride-glucose index,TyG)、脑源性神经营养因子(brain-derived neurotrophic factor,BDNF)对非糖尿病维持性血液透析(maintenance hemodialysis,MHD)患者的肌肉减少症的诊断价值。方法选择2021年1...目的探讨三酰甘油-葡萄糖指数(triglyceride-glucose index,TyG)、脑源性神经营养因子(brain-derived neurotrophic factor,BDNF)对非糖尿病维持性血液透析(maintenance hemodialysis,MHD)患者的肌肉减少症的诊断价值。方法选择2021年1月—2023年1月南京中医药大学附属南京医院肾内科收治的MHD患者,根据2019年亚洲肌少症工作组(Asian Working Group for Sarcopenia,AWGS)修订的诊断标准统计肌肉减少症患病情况,检测血清三酰甘油、葡萄糖、BDNF水平,计算TyG。Pearson分析TyG、BDNF与骨骼肌质量指数(skeletal muscle mass index,SMI)、握力、步速的相关性。多因素Logistic回归分析影响MHD患者合并肌肉减少症的因素,受试者工作特征(ROC)曲线TyG、BDNF诊断MHD患者合并肌肉减少症的价值。结果126例MHD患者中39例(30.95%)患者合并肌肉减少症,与非肌肉减少症组比较,肌肉减少症组患者TyG较高、血清BDNF水平偏低(t=7.974、14.699,均P<0.001)。肌肉减少症组患者TyG与SMI、握力、步速呈负相关(r=-0.365、-0.319、-0.452,均P<0.001),BDNF与SMI、握力、步速呈正相关(r=0.326、0.275、0.395,P<0.001、0.003、P<0.001)。年龄偏大(OR=1.861,95%CI:1.040~3.330,P=0.019)、高TyG(OR=2.050,95%CI:1.049~4.008,P=0.015)是MHD患者合并肌肉减少症的危险因素,高白蛋白(OR=0.694,95%CI:0.515~0.935,P=0.008)、高BDNF(OR=0.630,95%CI:0.430~0.923,P=0.010)是MHD患者合并肌肉减少症的保护因素。TyG、BDNF诊断MHD患者合并肌肉减少症的曲线下面积为0.740(95%CI:0.654~0.814,P<0.001)、0.727(95%CI:0.641~0.803,P<0.001),联合TyG、BDNF诊断MHD患者合并肌肉减少症的曲线下面积为0.939(95%CI:0.882~0.974,P<0.001),高于单独诊断(Z=4.075、4.241,P均<0.001)。结论MHD患者TyG值增加,血清BDNF水平降低与合并肌肉减少症有关,联合TyG和BDNF可提高对MHD患者肌肉减少症风险评估价值。展开更多
基金Supported by Natural Science Foundation of Shanghai,China(No. 08ZR1405000)
文摘Objective:To investigate whether the activation of p38MAPK is involved in the neuropathic pain induced by P2X4 receptor,and the effects of activated P2X4 receptor and p38MAPK on expression of brain-derived neurotrophic factor (BDNF) in the chronic neuropathic pain.Methods:Lumbar intrathecal catheters were chronically implanted in male Sprague-Dawley rats.The right sciatic nerve was loosely ligated proximal to the sciatica's trifurcation at approximately 1.0 mm intervals with 4-0 silk sutures.The microglia inhibitor minocycline,P2X4 antagonist (TNP-ATP) and p38MAPK inhibitor (SB203580) were intrathecally administered every 12 h,3 d post-chronic constriction injury (CCI).Mechanical nociceptive thresholds were assessed with the paw withdrawal threshold (PWT) to von Frey filaments.The expression of P2X4 and BDNF were assessed by both immunohistochemical analysis and RT-PCR.Results:Intrathecal injection of minocycline or TNP-ATP or SB203580 significantly attenuated CCI-induced mechanical allodynia.The time courses of P2X4 receptor and BDNF expression were increased at all points after CCI and reached a peak level on postoperative d 7.Intrathecal injection of minocycline or TNP-ATP or SB203580 markedly suppressed the increase of CCI-induced P2X4 receptor and BDNF expression in the spinal cord.Conclusion:The activation of P2X4 receptor BDNF pathways contributes to neuropathic pain in CCI rats,and the activation of p38MAPK is involved in the neuropathic pain induced by P2X4 receptor.
基金supported by the Health Commission Clinical Characteristic Discipline Construction Program of Pudong New Area,Shanghai (PW Yts2021-17)Youth Science and Technology Project Health and Family Planning Commission of Pudong New Area,Shanghai (PWRq2020-35)。
文摘BACKGROUND:To determine the protective role of mesencephalic astrocyte-derived neurotrophic factor(MANF) in regulating sepsis-associated acute kidney injury(S-AKI).METHODS:A total of 96 mice were randomly divided into the control group,control+MANF group,S-AKI group,and S-AKI+MANF group.The S-AKI model was established by injecting lipopolysaccharide(LPS) at 10 mg/kg intraperitoneally.MANF(200 μg/kg) was administered to the control+MANF and S-AKI+MANF groups.An equal dose of normal saline was administered daily intraperitoneally in the control and S-AKI groups.Serum and kidney tissue samples were obtained for biochemical analysis.Western blotting was used to detect the protein expression of MANF in the kidney,and enzyme-linked immunosorbent assay(ELISA) was used to determine expression of MANF in the serum,pro-inflammatory cytokines(tumor necrosis factor-α [TNF-α] and interleukin-6 [IL-6]).Serum creatinine(SCr),and blood urea nitrogen(BUN)were examined using an automatic biochemical analyzer.In addition,the kidney tissue was observed for pathological changes by hematoxylin-eosin staining.The comparison between two groups was performed by unpaired Student’s t-test,and statistics among multiple groups were carried out using Tukey’s post hoc test following one-way analysis of variance(ANOVA).A P-value <0.05 was considered statistically significant.RESULTS:At the early stage of S-AKI,MANF in the kidney tissue was up-regulated,but with the development of the disease,it was down-regulated.Renal function was worsened in the S-AKI group,and TNF-α and IL-6 were elevated.The administration of MANF significantly alleviated the elevated levels of SCr and BUN and inhibited the expression of TNF-α and IL-6 in the kidney.The pathological changes were more extensive in the S-AKI group than in the S-AKI+MANF group.CONCLUSION:MANF treatment may significantly alleviate renal injury,reduce the inflammatory response,and alleviate or reverse kidney tissue damage.MANF may have a protective effect on S-AKI,suggesting a potential treatment for S-AKI.
基金National Natural Science Foundation of China (No.30000048) National Basic Research Program of China (G1999054000)
文摘Objective: To study the sequence and function of the glial cell line-derived neurotrophic factor (GDNF) transcript in subjects of Han nationality. Methods: The Han nationality GDNF transcript was amplified by RT-PCR and expressed by baculovirus expression system. Biological activity of the expressed product was measured by the primary culture of midbrain dopaminergic neurons. Results: There only existed the shorter GDNF transcript of 555 bp in the Han nationality. The secretory expression product of the shorter transcript in insect cells promoted the survival and differentiation of dopaminergic neurons. Conclusion: It is found that there is a 78 bp deletion in the Han nationality GDNF transcript compared with the reported 633 bp GDNF transcript. The 78 bp deletion does not affect the secretory expression and biological activity of GDNF mature protein.
文摘目的研究百会穴久留针法通过脑源性神经营养因子(BDNF)/酪氨酸受体激酶B(TrkB)通路改善缺血性脑卒中小鼠神经功能的作用及机制。方法选择雄性C57BL/6J小鼠48只,随机分为假手术1组、模型1组、久留针1组、普通留针组,每组12只。后3组采用线栓法制备缺血性脑卒中模型,手术造模后第1天起久留针1组和普通留针组分别给予百会穴久留针和普通留针治疗,连续14 d。另选择雄性C57BL/6J小鼠40只,随机分为假手术2组、模型2组、久留针2组、久留针3组,每组10只。后3组采用线栓法制备缺血性脑卒中模型,针灸治疗前分别给予腺相关病毒100μl单次尾静脉注射。采用改良神经功能缺损评分(mNSS)及水迷宫实验的逃避潜伏期、目标象限停留时间、穿越原平台次数评价神经功能。结果与假手术1组比较,模型1组mNSS评分、目标象限停留时间、穿越原平台次数及缺血脑组织BDNF、TrkB表达明显降低,细胞凋亡率及裂解型半胱氨酸天冬氨酸蛋白酶3(Caspase-3)表达明显增加,差异有统计学意义(P<0.05);与模型1组比较,久留针1组和普通留针组mNSS评分、目标象限停留时间、穿越原平台次数及缺血脑组织BDNF、TrkB表达明显增加,细胞凋亡率及裂解型Caspase-3表达明显降低,且久留针1组上述变化较普通留针组更为显著,差异有统计学意义(P<0.05)。与久留针2组比较,久留针3组mNSS评分、目标象限停留时间、穿越原平台次数及缺血脑组织中BDNF表达明显降低(P<0.05),细胞凋亡率及裂解型Caspase-3表达明显增加[(16.41±2.25)%vs(7.59±1.09)%;1.46±0.16 vs 0.94±0.12,P<0.05]。结论百会穴久留针治疗对缺血性脑卒中小鼠神经功能的改善作用更为显著,激活BDNF/TrkB通路是其发挥神经保护作用的相关分子机制。
文摘目的探讨三酰甘油-葡萄糖指数(triglyceride-glucose index,TyG)、脑源性神经营养因子(brain-derived neurotrophic factor,BDNF)对非糖尿病维持性血液透析(maintenance hemodialysis,MHD)患者的肌肉减少症的诊断价值。方法选择2021年1月—2023年1月南京中医药大学附属南京医院肾内科收治的MHD患者,根据2019年亚洲肌少症工作组(Asian Working Group for Sarcopenia,AWGS)修订的诊断标准统计肌肉减少症患病情况,检测血清三酰甘油、葡萄糖、BDNF水平,计算TyG。Pearson分析TyG、BDNF与骨骼肌质量指数(skeletal muscle mass index,SMI)、握力、步速的相关性。多因素Logistic回归分析影响MHD患者合并肌肉减少症的因素,受试者工作特征(ROC)曲线TyG、BDNF诊断MHD患者合并肌肉减少症的价值。结果126例MHD患者中39例(30.95%)患者合并肌肉减少症,与非肌肉减少症组比较,肌肉减少症组患者TyG较高、血清BDNF水平偏低(t=7.974、14.699,均P<0.001)。肌肉减少症组患者TyG与SMI、握力、步速呈负相关(r=-0.365、-0.319、-0.452,均P<0.001),BDNF与SMI、握力、步速呈正相关(r=0.326、0.275、0.395,P<0.001、0.003、P<0.001)。年龄偏大(OR=1.861,95%CI:1.040~3.330,P=0.019)、高TyG(OR=2.050,95%CI:1.049~4.008,P=0.015)是MHD患者合并肌肉减少症的危险因素,高白蛋白(OR=0.694,95%CI:0.515~0.935,P=0.008)、高BDNF(OR=0.630,95%CI:0.430~0.923,P=0.010)是MHD患者合并肌肉减少症的保护因素。TyG、BDNF诊断MHD患者合并肌肉减少症的曲线下面积为0.740(95%CI:0.654~0.814,P<0.001)、0.727(95%CI:0.641~0.803,P<0.001),联合TyG、BDNF诊断MHD患者合并肌肉减少症的曲线下面积为0.939(95%CI:0.882~0.974,P<0.001),高于单独诊断(Z=4.075、4.241,P均<0.001)。结论MHD患者TyG值增加,血清BDNF水平降低与合并肌肉减少症有关,联合TyG和BDNF可提高对MHD患者肌肉减少症风险评估价值。
