The muscle protein myosin binding protein C (MyBPC) is a large multi-domain protein whose role in the sarcomere is complex and not yet fully understood. Mutations in MyBPC are strongly associated with the heart diseas...The muscle protein myosin binding protein C (MyBPC) is a large multi-domain protein whose role in the sarcomere is complex and not yet fully understood. Mutations in MyBPC are strongly associated with the heart disease familial hypertrophic cardiomyopathy (FHC) and these experiments of nature have provided some insight into the intricate workings of this protein in the heart. While some regions of the MyBPC molecule have been assigned a function in the regulation of muscle contraction, the interaction of other regions with various parts of the myosin molecule and the sarcomeric proteins, actin and titin, remain obscure. In additic n, several intra-domain interactions between adjacent MyBPC molecules have been identified. Although the basic structure of the molecule (a series of immunoglobulin and fibronectin domains) has been elucidated, the assembly of MyBPC in the sarcomere is a topic for debate. By analysing the MyBPC sequence with respect to FHC-causing mutations it is possible to identify individual residues or regions of each domain that may be important either for binding or regulation. This review looks at the current literature, in concert with alignments and the structural models of MyBPC, in an attempt to understand how FHC mutations may lead to the disease state.展开更多
粘附分子通过介导细胞间相互作用发挥其在发育、再生和突触修饰等方面的重要作用.神经细胞粘附分子CHL1(close homologue of L1)是近年发现的粘附分子,属于粘附分子免疫球蛋白超家族,集中表达于神经系统,通过亲异性作用(heterophilic in...粘附分子通过介导细胞间相互作用发挥其在发育、再生和突触修饰等方面的重要作用.神经细胞粘附分子CHL1(close homologue of L1)是近年发现的粘附分子,属于粘附分子免疫球蛋白超家族,集中表达于神经系统,通过亲异性作用(heterophilic interaction)介导细胞与细胞、细胞与胞外基质的相互作用,进而参与神经系统的发育、轴突的生长、迁移及导向等过程.展开更多
免疫球蛋白超家族补体受体(complement receptor of the immunoglobulin superfamily,CRIg)可通过T细胞和细胞因子等调节免疫反应,参与多种疾病发生。文中对动物模型研究CRIg在免疫性肝损伤、肠缺血再灌注损伤、Ⅰ型糖尿病、自身免疫性...免疫球蛋白超家族补体受体(complement receptor of the immunoglobulin superfamily,CRIg)可通过T细胞和细胞因子等调节免疫反应,参与多种疾病发生。文中对动物模型研究CRIg在免疫性肝损伤、肠缺血再灌注损伤、Ⅰ型糖尿病、自身免疫性葡萄膜炎及类风湿关节炎等疾病发生机制中的作用作一综述。展开更多
文摘The muscle protein myosin binding protein C (MyBPC) is a large multi-domain protein whose role in the sarcomere is complex and not yet fully understood. Mutations in MyBPC are strongly associated with the heart disease familial hypertrophic cardiomyopathy (FHC) and these experiments of nature have provided some insight into the intricate workings of this protein in the heart. While some regions of the MyBPC molecule have been assigned a function in the regulation of muscle contraction, the interaction of other regions with various parts of the myosin molecule and the sarcomeric proteins, actin and titin, remain obscure. In additic n, several intra-domain interactions between adjacent MyBPC molecules have been identified. Although the basic structure of the molecule (a series of immunoglobulin and fibronectin domains) has been elucidated, the assembly of MyBPC in the sarcomere is a topic for debate. By analysing the MyBPC sequence with respect to FHC-causing mutations it is possible to identify individual residues or regions of each domain that may be important either for binding or regulation. This review looks at the current literature, in concert with alignments and the structural models of MyBPC, in an attempt to understand how FHC mutations may lead to the disease state.
文摘粘附分子通过介导细胞间相互作用发挥其在发育、再生和突触修饰等方面的重要作用.神经细胞粘附分子CHL1(close homologue of L1)是近年发现的粘附分子,属于粘附分子免疫球蛋白超家族,集中表达于神经系统,通过亲异性作用(heterophilic interaction)介导细胞与细胞、细胞与胞外基质的相互作用,进而参与神经系统的发育、轴突的生长、迁移及导向等过程.
文摘肺癌是全球发病率与死亡率均位于第一位的恶性肿瘤。肺腺癌(lung adenocarcinoma,LUAD)大约占整个肺癌的40%。但是,目前对肺腺癌发生发展的机制尚未阐明。TCGA在线数据库GEPIA证实,免疫球蛋白超级家族成员9(immunoglobulin superfamily member 9,IGSF9)在肺腺癌中的平均表达量是6.56,其在正常癌旁组织中的平均表达量是0.55,提示IGSF9在肺腺癌中的表达量是正常癌旁组织的11.93倍。人类蛋白组学数据库也提示,IGSF9在肺腺癌中高表达。通过qRT-PCR检测IGSF9在肺腺癌细胞中的表达量,发现其在A549和H1299细胞中的表达量分别是其在BEAS-2B细胞中的4.17倍和6.6倍。细胞功能实验发现,过表达IGSF9,其LUAD细胞的增殖能力显著增加。平板克隆形成实验发现,在A549细胞中,对照组平板克隆大约有240个,过表达IGSF9后,该组细胞的平板克隆数大约是385个,实验组的克隆数目是对照组的1.60倍(P<0.01)。敲低IGSF9,则LUAD细胞增殖能力明显降低。平板克隆形成实验发现,在H1299细胞中,对照组平板克隆大约有320个,敲低IGSF9后,该组细胞的平板克隆数大约是164个,实验组的克隆数目仅为对照组的51.25%(P<0.01)。生物信息学预测结合后期研究证实,IGSF9可显著抑制叉头蛋白K2(forkhead box protein K2,FOXK2)的表达。MTS实验发现,过表达FOXK2可显著逆转IGSF9对LUAD细胞增殖的促进作用,而敲低FOXK2则可明显补偿敲低IGSF9对LUAD细胞的增殖抑制作用。这些结果提示,IGSF9通过下调FOXK2从而促进LUAD细胞的增殖。
文摘免疫球蛋白超家族补体受体(complement receptor of the immunoglobulin superfamily,CRIg)可通过T细胞和细胞因子等调节免疫反应,参与多种疾病发生。文中对动物模型研究CRIg在免疫性肝损伤、肠缺血再灌注损伤、Ⅰ型糖尿病、自身免疫性葡萄膜炎及类风湿关节炎等疾病发生机制中的作用作一综述。
