The mitogen-activated protein kinase（MAPK）pathways are a group of conserved intracellular signalling pathways present in most cells including neurons and glia.These pathways respond to a variety of stimuli including...The mitogen-activated protein kinase（MAPK）pathways are a group of conserved intracellular signalling pathways present in most cells including neurons and glia.These pathways respond to a variety of stimuli including growth factors,cytokines and oxidative stress to generate appropriate cellular responses such as modulation of gene expression,cell proliferation,differentiation and survival as well as the stress response（Korhonen and Moilanen,2014）.展开更多
研究丝裂原活化蛋白激酶(mitogen activated protein kinase,MAPK)相关蛋白丝裂原活化蛋白激酶磷酸酶(mitogen activated protein kinase phosphatase-1,MKP-1)和磷酸化细胞外信号调节激酶(phosphorylation extracellular signal-regula...研究丝裂原活化蛋白激酶(mitogen activated protein kinase,MAPK)相关蛋白丝裂原活化蛋白激酶磷酸酶(mitogen activated protein kinase phosphatase-1,MKP-1)和磷酸化细胞外信号调节激酶(phosphorylation extracellular signal-regulated kinases,p-ERK1/2)在上皮性卵巢肿瘤组织及正常卵巢组织中的表达差异,并探讨其在卵巢癌发生、发展中的作用,为卵巢癌的治疗提供新的思路及实验依据。选取64例上皮性卵巢癌、35例卵巢上皮性交界瘤及32例卵巢上皮性良性肿瘤患者的组织,另选取26例正常卵巢组织作对照,进行MKP-1及p-ERK1/2的免疫组化分析,并同时对其中部分病例进行上述蛋白的western-blot研究。结果显示正常卵巢、良性肿瘤、交界瘤及卵巢癌组织MKP-1的表达依次递减,各组之间进行两两比较均有显著性差异(P<0.01),FIGOⅢ期与Ⅳ期卵巢癌组织MKP-1的表达显著低于Ⅰ期与Ⅱ期卵巢癌组织(P<0.01);而p-ERK1/2在正常卵巢、良性肿瘤、交界瘤及卵巢癌组织的表达依次递增,各组之间进行两两比较也均有显著性差异(P<0.01),FIGOⅢ期与Ⅳ期卵巢癌组织p-ERK1/2的表达显著高于Ⅰ期与Ⅱ期卵巢癌组织(P<0.01)。且免疫组化及western-blot均显示MKP-1与p-ERK1/2在卵巢癌组织中的表达存在显著的负相关性,(r=-0.90,P<0.01及r=-0.78,P<0.01)。本研究结果表明MKP-1与p-ERK1/2的异常表达可能跟上皮性卵巢肿瘤的发生、发展有关,它们之间的表达失衡可能是卵巢癌发生、发展的原因之一。展开更多
Alzheimer ’s disease(AD) is a leading cause of dementia in the elderly.Mitogen-activated protein kinase phosphatase 1(MKP-1) plays a neuroprotective role in AD.However,the molecular mechanisms underlying the effects ...Alzheimer ’s disease(AD) is a leading cause of dementia in the elderly.Mitogen-activated protein kinase phosphatase 1(MKP-1) plays a neuroprotective role in AD.However,the molecular mechanisms underlying the effects of MKP-1 on AD have not been extensively studied.MicroRNAs(miRNAs) regulate gene expression at the post-transcriptional level,thereby repressing mRNA translation.Here,we reported that the microRNA-429-3p(miR-429-3p) was significantly increased in the brain of APP23/PS45 AD model mice and N2AAPPAD model cells.We further found that miR-429-3p could downregulate MKP-1 expression by directly binding to its 3’-untranslated region(3’ UTR).Inhibition of miR-429-3p by its antagomir(A-miR-429) restored the expression of MKP-1 to a control level and consequently reduced the amyloidogenic processing of APP and Aβ accumulation.More importantly,intranasal administration of A-miR-429 successfully ameliorated the deficits of hippocampal CA1 long-term potentiation and spatial learning and memory in AD model mice by suppressing extracellular signal-regulated kinase(ERK1/2)-mediated GluAl hyperphosphorylation at Ser831 site,thereby increasing the surface expression of GluAl-containing α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptors(AMPARs).Together,these results demonstrate that inhibiting miR-429-3p to upregulate MKP-1 effectively improves cognitive and synaptic functions in AD model mice,suggesting that miR-429/MKP-1 pathway may be a novel therapeutic target for AD treatment.展开更多
丝裂原活化蛋白激酶磷酸酶-1(mitogen-activated protein kinase phosphatase-1,MKP-1)作为生物体内重要的信号转导系统—丝裂原活化蛋白激酶系统(mitogen-activated protein kinases,MAPKs)去磷酸化的重要调节者,在包括神经系统的各种...丝裂原活化蛋白激酶磷酸酶-1(mitogen-activated protein kinase phosphatase-1,MKP-1)作为生物体内重要的信号转导系统—丝裂原活化蛋白激酶系统(mitogen-activated protein kinases,MAPKs)去磷酸化的重要调节者,在包括神经系统的各种生物学系统中发挥重要作用。该文对MKP-1的生物学活性、调控以及在神经系统中的作用进行综述,以期为MKP-1作为药理学靶点的相关研究提供参考。展开更多
Objective： Mitogen-activated protein kinases （MAPKs） are correlated with a more malignant phenotype in many cancers. This study was designed to evaluate the predictive value of the expression of MAPK phosphatase-1 ...Objective： Mitogen-activated protein kinases （MAPKs） are correlated with a more malignant phenotype in many cancers. This study was designed to evaluate the predictive value of the expression of MAPK phosphatase-1 （MKP-1） and phosphorylated extracellular signal-regulated kinase 1/2 （p-ERKl/2）, as the key regulatory mechanism of the MAPKs, in lung squamous cell carcinoma （SCC）. Methods： We assessed the expressions of MKP-1 and p-ERK1/2 in twenty subjects at different differentiation degree of SCC and five normal lungs by immunohistochemistry and real-time reverse transcriptase polymerase chain reaction （RT-PCR） analysis. Results： Immunohistochemistry and real-time RT-PCR assay showed that the expression of MKP-1 was gradually decreased as tissue type went from normal lung tissues to increasingly undifferentiated carcinoma, and it was negatively correlated with tumor differentiation （P〈0.01）. However, the expression of p-ERK1/2 or ERKl/2 was gradually increased as tissue type went from normal lung tissues to increasingly undifferentiated carcinoma, and it was positively correlated with tumor differentiation （P〈0.01）. Conclusions： Our data indicates the relevance of MKP-1 and p-ERK1/2 in SCC as a potential positive and negative prognostic factor. The imbalanced expression of MKP-1 and p-ERKl/2 may play a role in the development of SCC and these two molecules may be new targets for the therapy and prognosis of SCC.展开更多
基金support from Science Foundation Ireland under grant No. SFI/IA/1537
文摘The mitogen-activated protein kinase（MAPK）pathways are a group of conserved intracellular signalling pathways present in most cells including neurons and glia.These pathways respond to a variety of stimuli including growth factors,cytokines and oxidative stress to generate appropriate cellular responses such as modulation of gene expression,cell proliferation,differentiation and survival as well as the stress response（Korhonen and Moilanen,2014）.
基金supported by grants from the National Natural Science Foundation of China (32371030, 82371194, 82071395 and 82001158)the Natural Science Foundation of Chongqing(CSTB2022NSCQ-LZX0010 and cstc2021ycjh-bgzxm0186, China)+1 种基金the Scientific and Technological Innovation Project for the Construction of Chengdu-Chongqing Economic Circle (KJCX ZD2020021, China)CQMU Program for Youth Innovation in Future Medicine (W0044, China)
文摘Alzheimer ’s disease(AD) is a leading cause of dementia in the elderly.Mitogen-activated protein kinase phosphatase 1(MKP-1) plays a neuroprotective role in AD.However,the molecular mechanisms underlying the effects of MKP-1 on AD have not been extensively studied.MicroRNAs(miRNAs) regulate gene expression at the post-transcriptional level,thereby repressing mRNA translation.Here,we reported that the microRNA-429-3p(miR-429-3p) was significantly increased in the brain of APP23/PS45 AD model mice and N2AAPPAD model cells.We further found that miR-429-3p could downregulate MKP-1 expression by directly binding to its 3’-untranslated region(3’ UTR).Inhibition of miR-429-3p by its antagomir(A-miR-429) restored the expression of MKP-1 to a control level and consequently reduced the amyloidogenic processing of APP and Aβ accumulation.More importantly,intranasal administration of A-miR-429 successfully ameliorated the deficits of hippocampal CA1 long-term potentiation and spatial learning and memory in AD model mice by suppressing extracellular signal-regulated kinase(ERK1/2)-mediated GluAl hyperphosphorylation at Ser831 site,thereby increasing the surface expression of GluAl-containing α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptors(AMPARs).Together,these results demonstrate that inhibiting miR-429-3p to upregulate MKP-1 effectively improves cognitive and synaptic functions in AD model mice,suggesting that miR-429/MKP-1 pathway may be a novel therapeutic target for AD treatment.
文摘丝裂原活化蛋白激酶磷酸酶-1(mitogen-activated protein kinase phosphatase-1,MKP-1)作为生物体内重要的信号转导系统—丝裂原活化蛋白激酶系统(mitogen-activated protein kinases,MAPKs)去磷酸化的重要调节者,在包括神经系统的各种生物学系统中发挥重要作用。该文对MKP-1的生物学活性、调控以及在神经系统中的作用进行综述,以期为MKP-1作为药理学靶点的相关研究提供参考。
基金supported by the National Natural Science Foundation of China (No. 30900654)the Science and Technology Department of Zhejiang Province (No. 2009R10031)the Health Bureau of Zhejiang Province (No. 2009QN010), China
文摘Objective： Mitogen-activated protein kinases （MAPKs） are correlated with a more malignant phenotype in many cancers. This study was designed to evaluate the predictive value of the expression of MAPK phosphatase-1 （MKP-1） and phosphorylated extracellular signal-regulated kinase 1/2 （p-ERKl/2）, as the key regulatory mechanism of the MAPKs, in lung squamous cell carcinoma （SCC）. Methods： We assessed the expressions of MKP-1 and p-ERK1/2 in twenty subjects at different differentiation degree of SCC and five normal lungs by immunohistochemistry and real-time reverse transcriptase polymerase chain reaction （RT-PCR） analysis. Results： Immunohistochemistry and real-time RT-PCR assay showed that the expression of MKP-1 was gradually decreased as tissue type went from normal lung tissues to increasingly undifferentiated carcinoma, and it was negatively correlated with tumor differentiation （P〈0.01）. However, the expression of p-ERK1/2 or ERKl/2 was gradually increased as tissue type went from normal lung tissues to increasingly undifferentiated carcinoma, and it was positively correlated with tumor differentiation （P〈0.01）. Conclusions： Our data indicates the relevance of MKP-1 and p-ERK1/2 in SCC as a potential positive and negative prognostic factor. The imbalanced expression of MKP-1 and p-ERKl/2 may play a role in the development of SCC and these two molecules may be new targets for the therapy and prognosis of SCC.
