Objective:Mitochondrial fatty acid oxidation is a metabolic pathway whose dysregulation is recognized as a critical factor in various cancers,because it sustains cancer cell survival,proliferation,and metastasis.The a...Objective:Mitochondrial fatty acid oxidation is a metabolic pathway whose dysregulation is recognized as a critical factor in various cancers,because it sustains cancer cell survival,proliferation,and metastasis.The acyl-Co A synthetase long-chain(ACSL)family is known to activate long-chain fatty acids,yet the specific role of ACSL3 in breast cancer has not been determined.Methods:We assessed the prognostic value of ACSL3 in breast cancer by using data from tumor samples.Gain-of-function and lossof-function assays were also conducted to determine the roles and downstream regulatory mechanisms of ACSL3 in vitro and in vivo.Results:ACSL3 expression was notably downregulated in breast cancer tissues compared with normal tissues,and this phenotype correlated with improved survival outcomes.Functional experiments revealed that ACSL3 knockdown in breast cancer cells promoted cell proliferation,migration,and epithelial±mesenchymal transition.Mechanistically,ACSL3 was found to inhibitβ-oxidation and the formation of associated byproducts,thereby suppressing malignant behavior in breast cancer.Importantly,ACSL3 was found to interact with YES proto-oncogene 1,a member of the Src family of tyrosine kinases,and to suppress its activation through phosphorylation at Tyr419.The decrease in activated YES1 consequently inhibited YAP1 nuclear colocalization and transcriptional complex formation,and the expression of its downstream genes in breast cancer cell nuclei.Conclusions:ACSL3 suppresses breast cancer progression by impeding lipid metabolism reprogramming,and inhibiting malignant behaviors through phospho-YES1 mediated inhibition of YAP1 and its downstream pathways.These findings suggest that ACSL3 may serve as a potential biomarker and target for comprehensive therapeutic strategies for breast cancer.展开更多
长链脂酰辅酶A合成酶(acyl-CoA synthetase long-chain,ACSL)属于多基因家族编码的酶,位于内质网和线粒体外膜上的ACSL主要催化脂肪酸形成脂酰辅酶A(acyl-CoA),参与脂肪酸代谢、膜修饰等多种生理过程。ACSL家族在不同细胞的脂肪酸代谢...长链脂酰辅酶A合成酶(acyl-CoA synthetase long-chain,ACSL)属于多基因家族编码的酶,位于内质网和线粒体外膜上的ACSL主要催化脂肪酸形成脂酰辅酶A(acyl-CoA),参与脂肪酸代谢、膜修饰等多种生理过程。ACSL家族在不同细胞的脂肪酸代谢中发挥不同作用,其功能异常可导致如脂肪肝、动脉粥样硬化和糖尿病的发生。ACSL家族成员1(ACSL family member 1,ACSL1)作为ACSL家族在肝脏中的主要亚型,主要参与维持胆固醇稳定、脂肪酸活化以及胆汁酸代谢,同时与某些肝脏疾病如肝细胞癌、非酒精性脂肪肝的发生发展密切相关。本文综述了ACSL家族各成员的生理功能、作用特点,并阐释了ACSL1对脂质代谢、调节细胞铁死亡的影响以及在相关疾病如肝纤维化、肝细胞癌、恶病质、非酒精性脂肪肝、甲状腺癌以及乳腺癌发展中的作用机制的研究进展。展开更多
为探究绵羊长链脂酰辅酶A合成酶1基因(ACSL1)编码蛋白的结构与功能,通过生物信息学分析对绵羊ACSL1蛋白的二、三级结构预测,分析其信号肽剪切位点、理化性质、亲/疏水性、亚细胞定位和蛋白互作网络通路。结果表明,ACSL1基因共编码699个...为探究绵羊长链脂酰辅酶A合成酶1基因(ACSL1)编码蛋白的结构与功能,通过生物信息学分析对绵羊ACSL1蛋白的二、三级结构预测,分析其信号肽剪切位点、理化性质、亲/疏水性、亚细胞定位和蛋白互作网络通路。结果表明,ACSL1基因共编码699个氨基酸,理论分子量78.21 k D,理论等电点8.0,具有1个跨膜结构域,编码蛋白的不稳定系数33.23,主要分布在细胞质(26.1%)、线粒体(13%)和内质网(13%),无信号肽,是一种疏水性稳定蛋白。其蛋白结构主要以α螺旋和无规则卷曲为主,其中共有276个α螺旋(39.48%),148个β折叠(21.17%),217个无规则卷曲(31.04%),折叠缠绕后形成三级结构。绵羊ACSL1蛋白主要与FADS1、FADS2、ACOX1、ACOX2、LPL、MGLL、ELOVL6、ACADL等9个蛋白相关,可能处在同一信号通路,通过与疏水性蛋白结合后,在机体内调节其生物学功能。展开更多
基金supported by the National Natural Science Foundation of China(Grant No.82203786)the Natural Science Foundation of Liaoning Province of China(Grant No.2022-YGJC-68 and Grant No.2023-BS-105)the Chinese Young Breast Experts Research Project(Grant No.CYBER-2021-A02 and Grant No.CYBER-2022-001)。
文摘Objective:Mitochondrial fatty acid oxidation is a metabolic pathway whose dysregulation is recognized as a critical factor in various cancers,because it sustains cancer cell survival,proliferation,and metastasis.The acyl-Co A synthetase long-chain(ACSL)family is known to activate long-chain fatty acids,yet the specific role of ACSL3 in breast cancer has not been determined.Methods:We assessed the prognostic value of ACSL3 in breast cancer by using data from tumor samples.Gain-of-function and lossof-function assays were also conducted to determine the roles and downstream regulatory mechanisms of ACSL3 in vitro and in vivo.Results:ACSL3 expression was notably downregulated in breast cancer tissues compared with normal tissues,and this phenotype correlated with improved survival outcomes.Functional experiments revealed that ACSL3 knockdown in breast cancer cells promoted cell proliferation,migration,and epithelial±mesenchymal transition.Mechanistically,ACSL3 was found to inhibitβ-oxidation and the formation of associated byproducts,thereby suppressing malignant behavior in breast cancer.Importantly,ACSL3 was found to interact with YES proto-oncogene 1,a member of the Src family of tyrosine kinases,and to suppress its activation through phosphorylation at Tyr419.The decrease in activated YES1 consequently inhibited YAP1 nuclear colocalization and transcriptional complex formation,and the expression of its downstream genes in breast cancer cell nuclei.Conclusions:ACSL3 suppresses breast cancer progression by impeding lipid metabolism reprogramming,and inhibiting malignant behaviors through phospho-YES1 mediated inhibition of YAP1 and its downstream pathways.These findings suggest that ACSL3 may serve as a potential biomarker and target for comprehensive therapeutic strategies for breast cancer.
文摘目的探究糖尿病肾病(diabetic kidney disease,DKD)血瘀证大鼠肾损害与肾脏铁死亡的潜在机制。方法将50只SPF级雄性SD大鼠分为对照组、DKD组、DKD血瘀证组。采用腹腔注射链脲佐菌素的方法复制DKD大鼠模型,采用尾静脉注射右旋糖酐的方法复制DKD血瘀证模型。实验过程中观察大鼠血瘀证表现及检测24 h尿蛋白、血清肌酐、血尿素氮、血液流变学指标,采用苏木精-伊红染色、Masson染色、PAS染色观察肾脏的组织形态,采用透射电子显微镜观察铁死亡典型细胞的线粒体变化;采用免疫组织化学法、Western blot法检测肾组织铁死亡相关蛋白[长链酯酰辅酶A合成酶4(Acyl-CoA synthetase long chain family member 4,ACSL4)、谷胱甘肽过氧化物酶4(glutathione peroxidase 4,GPX4)]及肾脏纤维化指标[纤维连接蛋白(fibronectin,FN)、Ⅳ型胶原蛋白(typeⅣcollagen,Col-Ⅳ)]的表达水平。结果与对照组比较,DKD组大鼠肾脏病理变化加重,线粒体损伤明显,24 h尿蛋白含量,血清肌酐、血尿素氮水平及全血黏度、血浆黏度明显升高(P<0.05),肾脏ACSL4、FN和Col-Ⅳ及其mRNA表达水平明显升高(P<0.05),GPX4蛋白及其mRNA表达水平明显降低(P<0.05)。DKD血瘀证大鼠出现唇色黯淡、眼球黯红、耳廓紫红、舌下脉络紫黯等血瘀证表现,24 h尿蛋白和血清肌酐、血尿素氮水平明显高于DKD组,光学显微镜下可见肾脏出现明显的系膜基质增生、肾小球萎缩、肾间质胶原沉积和纤维化,电子显微镜下可见肾组织细胞线粒体损伤明显,嵴基本断裂,ACSL4、FN、Col-Ⅳ及其mRNA表达水平较DKD组明显上升(P<0.05),GPX4蛋白及其mRNA表达水平较DKD组明显下降(P<0.05)。结论DKD血瘀证大鼠肾脏损害更加严重,其机制可能与GPX4、ACSL4介导的铁死亡有关。
文摘长链脂酰辅酶A合成酶(acyl-CoA synthetase long-chain,ACSL)属于多基因家族编码的酶,位于内质网和线粒体外膜上的ACSL主要催化脂肪酸形成脂酰辅酶A(acyl-CoA),参与脂肪酸代谢、膜修饰等多种生理过程。ACSL家族在不同细胞的脂肪酸代谢中发挥不同作用,其功能异常可导致如脂肪肝、动脉粥样硬化和糖尿病的发生。ACSL家族成员1(ACSL family member 1,ACSL1)作为ACSL家族在肝脏中的主要亚型,主要参与维持胆固醇稳定、脂肪酸活化以及胆汁酸代谢,同时与某些肝脏疾病如肝细胞癌、非酒精性脂肪肝的发生发展密切相关。本文综述了ACSL家族各成员的生理功能、作用特点,并阐释了ACSL1对脂质代谢、调节细胞铁死亡的影响以及在相关疾病如肝纤维化、肝细胞癌、恶病质、非酒精性脂肪肝、甲状腺癌以及乳腺癌发展中的作用机制的研究进展。
文摘为探究绵羊长链脂酰辅酶A合成酶1基因(ACSL1)编码蛋白的结构与功能,通过生物信息学分析对绵羊ACSL1蛋白的二、三级结构预测,分析其信号肽剪切位点、理化性质、亲/疏水性、亚细胞定位和蛋白互作网络通路。结果表明,ACSL1基因共编码699个氨基酸,理论分子量78.21 k D,理论等电点8.0,具有1个跨膜结构域,编码蛋白的不稳定系数33.23,主要分布在细胞质(26.1%)、线粒体(13%)和内质网(13%),无信号肽,是一种疏水性稳定蛋白。其蛋白结构主要以α螺旋和无规则卷曲为主,其中共有276个α螺旋(39.48%),148个β折叠(21.17%),217个无规则卷曲(31.04%),折叠缠绕后形成三级结构。绵羊ACSL1蛋白主要与FADS1、FADS2、ACOX1、ACOX2、LPL、MGLL、ELOVL6、ACADL等9个蛋白相关,可能处在同一信号通路,通过与疏水性蛋白结合后,在机体内调节其生物学功能。
