Class A scavenger receptor （SR-A） plays an important role in macrophage adhesion. However, the underlying mechanism remains unclear. We previously found that 78 kDa glucose-regulated protein （GRP78） inhibited SR- ...Class A scavenger receptor （SR-A） plays an important role in macrophage adhesion. However, the underlying mechanism remains unclear. We previously found that 78 kDa glucose-regulated protein （GRP78） inhibited SR- A-mediated ligand internalization into macrophage by binding to SR-A. The aim of the study was to investigate whether GRP78 could regulate SR-A-mediated cell adhesion. We demonstrated that GRP78 bound directly to SR-A by fluorescence resonance energy transfer （FRET） assay. Overexpression of GRP78 inhibited macrophage adhesion via SR-A. These results suggest that GRP78 may act as an inhibitor of macrophage adhesion via SR-A.展开更多
【目的】探讨四逆汤对阿霉素诱导的慢性心力衰竭(CHF)大鼠内质网应激的影响。【方法】从90只大鼠中随机选取15只作为正常组,其余大鼠腹腔注射阿霉素构建CHF模型,同时,正常组给予腹腔注射生理盐水。造模结束后,正常组大鼠全部存活,造模...【目的】探讨四逆汤对阿霉素诱导的慢性心力衰竭(CHF)大鼠内质网应激的影响。【方法】从90只大鼠中随机选取15只作为正常组,其余大鼠腹腔注射阿霉素构建CHF模型,同时,正常组给予腹腔注射生理盐水。造模结束后,正常组大鼠全部存活,造模大鼠存活60只。再将60只CHF大鼠随机分为5组,即模型组,四逆汤低、中、高剂量组,曲美他嗪组,每组12只。四逆汤低、中、高剂量组分别给予1.4、4.2、12.6(生药)g·kg^(-1)·d^(-1)灌胃,曲美他嗪组给予曲美他嗪10 mg·kg^(-1)·d^(-1)灌胃,正常组和模型组给予相同体积的生理盐水灌胃。连续给药4周。采用小动物超声测量左心室舒张末期直径(LVEDD)、左心室射血分数(LVEF)和左心室缩短分数(LVFS)变化;采用酶联免疫吸附分析(ELISA)检测血浆脑钠肽(BNP)和血管紧张素Ⅱ(AngⅡ)水平;采用实时荧光定量聚合酶链反应(PCR)技术检测心肌组织葡萄糖调节蛋白78(GRP78)、RNA依赖的蛋白激酶样内质网激酶(PERK)和活化转录因子4(ATF4)mRNA表达。【结果】与正常组比较,模型组大鼠LVEDD显著增大,LVEF、LVFS均显著降低,血浆BNP和AngⅡ含量升高,心肌组织GRP78、PERK及ATF4 m RNA表达量升高(P <0.01);与模型组比较,四逆汤低、中、高剂量组及曲美他嗪组LVEDD降低,LVEF、LVFS均显著增加,血浆BNP和AngⅡ含量减少,心肌组织GRP78、PERK及ATF4 m RNA表达量降低,且呈剂量依赖性,其中,四逆汤高剂量组及曲美他嗪组差异均有统计学意义(P <0.05或P <0.01)。【结论】四逆汤可改善慢性心力衰竭大鼠模型心脏功能,其机制可能与抑制PERK/ATF4信号通路从而减轻内质网应激有关。展开更多
Conjunctival melanoma(CM) is a rare and fatal malignant eye tumor. In this study, we deciphered a novel anti-CM mechanism of a natural tetracyclic compound named as cucurbitacin B(CuB). We found that CuB remarkably in...Conjunctival melanoma(CM) is a rare and fatal malignant eye tumor. In this study, we deciphered a novel anti-CM mechanism of a natural tetracyclic compound named as cucurbitacin B(CuB). We found that CuB remarkably inhibited the proliferation of CM cells including CM-AS16,CRMM1, CRMM2 and CM2005.1, without toxicity to normal cells. CuB can also induce CM cells G2/M cell cycle arrest. RNA-seq screening identified KIF20A, a key downstream effector of FOXM1 pathway, was abolished by CuB treatment. Further target identification by activity-based protein profiling chemoproteomic approach revealed that GRP78 is a potential target of CuB. Several lines of evidence demonstrated that CuB interacted with GRP78 and bound with a Kdvalue of0.11 μmol/L. Furthermore, ATPase activity evaluation showed that CuB suppressed GRP78 both in human recombinant GRP78 protein and cellular lysates. Knockdown of the GRP78 gene significantly induced the downregulation of FOXM1 and related pathway proteins including KIF20A, underlying an interesting therapeutic perspective. Finally, CuB significantly inhibited tumor progression in NCG mice without causing obvious side effects in vivo. Taken together, our current work proved that GRP78-FOXM1-KIF20A as a promising pathway for CM therapy, and the traditional medicine CuB as a candidate drug to hinder this pathway.展开更多
Objective:To examine whether exposure of mouse neuronal cells to radiofrequency fields used in mobile communication devices can induce stress in endoplasmic reticulum(ER)and activate unfolded protein response(UPR).Met...Objective:To examine whether exposure of mouse neuronal cells to radiofrequency fields used in mobile communication devices can induce stress in endoplasmic reticulum(ER)and activate unfolded protein response(UPR).Methods:HT22 mouse hippocampus neuronal cells were exposed to continuous wave 900 MHz radiofrequency fields(RF)at 120μW/cm2 power intensity for 4 h/d for 5 consecutive days.The positive control cells were irradiated with 4 Gy of 60Coγ-rays at a dose rate of 0.5 Gy/min(GR).Twenty-four hours after the last exposure,cells were collected,and the expressions of sensor transmembrane proteins were detected using Western blot analysis.Results:The expression levels of Ire1,PERK,p-IRE1 and p-PERK,GRP78 and CHOP proteins were detected.There were no statistically significant differences in the expression levels of IRE1 and PERK proteins in control(CT),sham(SH)-,RF-and GR-exposed cells(P<0.05).The phosphorylated protein levels of p-IRE1 and p-PERK were significantly increased in cells exposed to RF and GR(P<0.05).The expression levels of GRP78 and CHOP were significantly increased in RF-and GR-exposed cells compared to CT and SH-exposed cells(P<0.05).Cells treated with 1μg/ml TM for 24 h showed significantly increased expression levels of GRP78 and CHOP proteins compared to controls(P<0.05).In the presence of 2 mmol/L PBA,TM-induced increased levels of GRP78 and CHOP proteins were reduced(P<0.05).Conclusions:The exposure of non-ionizing 900 MHz RF was able to cause stress in HT22 mouse neuronal cells and activated UPR in ER.Since UPR plays an important role in both cell survival(when UPR is mitigated)and apoptosis/death(under unresolvable stress conditions),further studies are required to determine the fate of the cells exposed to RF.展开更多
基金supported by grants from the National Basic ResearchProgram(973)(No.2012CB517503,No.2011CB503903,and No.2012CB945003)National Natural Science Foundation of China(No.81070120)to Qi Chen+1 种基金National Natural Science Foundation ofChina(No.81000118)University Natural Science Foundation ofJiangsu(No.10KJB310005)to Jingjing Ben
文摘Class A scavenger receptor （SR-A） plays an important role in macrophage adhesion. However, the underlying mechanism remains unclear. We previously found that 78 kDa glucose-regulated protein （GRP78） inhibited SR- A-mediated ligand internalization into macrophage by binding to SR-A. The aim of the study was to investigate whether GRP78 could regulate SR-A-mediated cell adhesion. We demonstrated that GRP78 bound directly to SR-A by fluorescence resonance energy transfer （FRET） assay. Overexpression of GRP78 inhibited macrophage adhesion via SR-A. These results suggest that GRP78 may act as an inhibitor of macrophage adhesion via SR-A.
文摘【目的】探讨四逆汤对阿霉素诱导的慢性心力衰竭(CHF)大鼠内质网应激的影响。【方法】从90只大鼠中随机选取15只作为正常组,其余大鼠腹腔注射阿霉素构建CHF模型,同时,正常组给予腹腔注射生理盐水。造模结束后,正常组大鼠全部存活,造模大鼠存活60只。再将60只CHF大鼠随机分为5组,即模型组,四逆汤低、中、高剂量组,曲美他嗪组,每组12只。四逆汤低、中、高剂量组分别给予1.4、4.2、12.6(生药)g·kg^(-1)·d^(-1)灌胃,曲美他嗪组给予曲美他嗪10 mg·kg^(-1)·d^(-1)灌胃,正常组和模型组给予相同体积的生理盐水灌胃。连续给药4周。采用小动物超声测量左心室舒张末期直径(LVEDD)、左心室射血分数(LVEF)和左心室缩短分数(LVFS)变化;采用酶联免疫吸附分析(ELISA)检测血浆脑钠肽(BNP)和血管紧张素Ⅱ(AngⅡ)水平;采用实时荧光定量聚合酶链反应(PCR)技术检测心肌组织葡萄糖调节蛋白78(GRP78)、RNA依赖的蛋白激酶样内质网激酶(PERK)和活化转录因子4(ATF4)mRNA表达。【结果】与正常组比较,模型组大鼠LVEDD显著增大,LVEF、LVFS均显著降低,血浆BNP和AngⅡ含量升高,心肌组织GRP78、PERK及ATF4 m RNA表达量升高(P <0.01);与模型组比较,四逆汤低、中、高剂量组及曲美他嗪组LVEDD降低,LVEF、LVFS均显著增加,血浆BNP和AngⅡ含量减少,心肌组织GRP78、PERK及ATF4 m RNA表达量降低,且呈剂量依赖性,其中,四逆汤高剂量组及曲美他嗪组差异均有统计学意义(P <0.05或P <0.01)。【结论】四逆汤可改善慢性心力衰竭大鼠模型心脏功能,其机制可能与抑制PERK/ATF4信号通路从而减轻内质网应激有关。
文摘食管癌（Esophageal cancinoma,EC）是由食管粘膜上皮和腺体发生的恶性肿瘤,也是最常见的消化管恶性肿瘤之一。为了早发现、早诊断、早治疗、已达到延长生存期和改善预后的目的,探索一种经济实用、特异性高、敏感性强、适用于人群普查的早期诊断食管癌的方法,成为医务工作者关注的焦点。近期研究发现,葡萄糖调节蛋白78（glucose regulated protein 78kD,GRP78）与肿瘤的发生、发展、耐药、
基金supported by the National Mega-project for Innovative Drugs of China(2019ZX09721001-004-003)the National Natural Science Foundation of China(82003603 and 81872747)+1 种基金the Innovative Research Team of High-level Local Universities in Shanghai,the National Special Fund for State Key Laboratory of Bioreactor Engineering(2060204,China)Shanghai Frontiers Science Center of Optogenetic Techniques for Cell Metabolism(2021 Sci&Tech 03-28,China).
文摘Conjunctival melanoma(CM) is a rare and fatal malignant eye tumor. In this study, we deciphered a novel anti-CM mechanism of a natural tetracyclic compound named as cucurbitacin B(CuB). We found that CuB remarkably inhibited the proliferation of CM cells including CM-AS16,CRMM1, CRMM2 and CM2005.1, without toxicity to normal cells. CuB can also induce CM cells G2/M cell cycle arrest. RNA-seq screening identified KIF20A, a key downstream effector of FOXM1 pathway, was abolished by CuB treatment. Further target identification by activity-based protein profiling chemoproteomic approach revealed that GRP78 is a potential target of CuB. Several lines of evidence demonstrated that CuB interacted with GRP78 and bound with a Kdvalue of0.11 μmol/L. Furthermore, ATPase activity evaluation showed that CuB suppressed GRP78 both in human recombinant GRP78 protein and cellular lysates. Knockdown of the GRP78 gene significantly induced the downregulation of FOXM1 and related pathway proteins including KIF20A, underlying an interesting therapeutic perspective. Finally, CuB significantly inhibited tumor progression in NCG mice without causing obvious side effects in vivo. Taken together, our current work proved that GRP78-FOXM1-KIF20A as a promising pathway for CM therapy, and the traditional medicine CuB as a candidate drug to hinder this pathway.
基金This research is supported by funding from the National Natural Science Foundation of China(Grant No.81373025).
文摘Objective:To examine whether exposure of mouse neuronal cells to radiofrequency fields used in mobile communication devices can induce stress in endoplasmic reticulum(ER)and activate unfolded protein response(UPR).Methods:HT22 mouse hippocampus neuronal cells were exposed to continuous wave 900 MHz radiofrequency fields(RF)at 120μW/cm2 power intensity for 4 h/d for 5 consecutive days.The positive control cells were irradiated with 4 Gy of 60Coγ-rays at a dose rate of 0.5 Gy/min(GR).Twenty-four hours after the last exposure,cells were collected,and the expressions of sensor transmembrane proteins were detected using Western blot analysis.Results:The expression levels of Ire1,PERK,p-IRE1 and p-PERK,GRP78 and CHOP proteins were detected.There were no statistically significant differences in the expression levels of IRE1 and PERK proteins in control(CT),sham(SH)-,RF-and GR-exposed cells(P<0.05).The phosphorylated protein levels of p-IRE1 and p-PERK were significantly increased in cells exposed to RF and GR(P<0.05).The expression levels of GRP78 and CHOP were significantly increased in RF-and GR-exposed cells compared to CT and SH-exposed cells(P<0.05).Cells treated with 1μg/ml TM for 24 h showed significantly increased expression levels of GRP78 and CHOP proteins compared to controls(P<0.05).In the presence of 2 mmol/L PBA,TM-induced increased levels of GRP78 and CHOP proteins were reduced(P<0.05).Conclusions:The exposure of non-ionizing 900 MHz RF was able to cause stress in HT22 mouse neuronal cells and activated UPR in ER.Since UPR plays an important role in both cell survival(when UPR is mitigated)and apoptosis/death(under unresolvable stress conditions),further studies are required to determine the fate of the cells exposed to RF.
