We and others have firmly established that surface IgM receptor (sIgM-R) crosslinking with antibodies to the i heavy chain (anti-i) leads to growth arrest and apoptosis in a series of well characterized B-cell lymphom...We and others have firmly established that surface IgM receptor (sIgM-R) crosslinking with antibodies to the i heavy chain (anti-i) leads to growth arrest and apoptosis in a series of well characterized B-cell lymphomas. This requires ablation of c-Myc protein expression and the concomitant induction of the cyclin-dependent-kinase inhibitor, p27Kip1. The signaling mechanisms regulating c-Myc and p27Kip1 protein expression are poorly understood. However, we recently established that sIgM-R mediated down-modulation of the PI-3K pathway directly affected c-Myc and p27Kip1 expression and accurately predicted growth展开更多
Colorectal cancer (CRC) is a common malignant tumor in the digestive tract, and 30%—85% of CRCs express epidermal growth factor receptors (EGFRs). Recently, treatments using cetuximab, also named C225, an anti-EGFR m...Colorectal cancer (CRC) is a common malignant tumor in the digestive tract, and 30%—85% of CRCs express epidermal growth factor receptors (EGFRs). Recently, treatments using cetuximab, also named C225, an anti-EGFR monoclonal antibody, for CRC have been demonstrated to cause an S492R mutation in EGFR. However, little is known about the biological function of S492R EGFR. Therefore, we attempted to elucidate its biological function in CRC cells and explore new treatment strategies for this mutant form. Our study indicated that EGFR and S492R EGFR accelerate the growth of CRC cells in vitro and in vivo and monoclonal antibody CH12, which specifically recognizes an EGFR tumor-specific epitope, can bind efficiently to S492R EGFR. Furthermore, mAb CH12 showed significantly stronger growth suppression activities and induced a more potent antibody-dependent cellular cytotoxicity effect on CRC cells bearing S492R EGFR than mAb C225.mAb CH12 obviously suppressed the growth of CRC xenografts with S492R EGFR mutations in vivo. Thus, mAb CH12 may be a promising therapeutic agent in treating patients with CRC bearing an S492R EGFR mutation.展开更多
The title compound H2SiW12O40·(CH3)2NH was synthesized in mixed solvent of aqueous and acetonitrile, and its crystal structure had been determined using single crystal X ray diffraction. The crystal belongs to mo...The title compound H2SiW12O40·(CH3)2NH was synthesized in mixed solvent of aqueous and acetonitrile, and its crystal structure had been determined using single crystal X ray diffraction. The crystal belongs to monoclinic, space group C2/m, a=2.0654(4)nm, b=1.3306(3)nm, c=1.3194(3)nm, β=119.59(3)°, V=3.1531(11)nm3, Dc=3.606Mg·m-3, Z=2, R=0.0462, Rw=0.0836. The title compound comprises of a 2+ unit, a polyanion and a free (CH3)2NH molecule. The ESR spectrum of the title compound shows that charge transfer between organic groups and polyanion takes place under irradiation of the sunlight in solid state. The TG study of the title compound shows that it had four stages of the weight loss, and the increase of the decomposition temperature for the polyanion shows that the stability of the polyanion was enhanced due to the influence of Zn2+ ion. CCDC:175866.展开更多
以苯酚、丙酮为原料,以自制的多金属氧酸盐[(CH_2)_5NH_2]_5BW_(12)O_(40)为催化剂,催化制备双酚A,对双酚A进行熔点测定和红外光谱(IR)分析。探索了酚酮摩尔比、催化剂用量、反应时间等因素对双酚A收率的影响。实验结果表明:溶剂甲苯45 ...以苯酚、丙酮为原料,以自制的多金属氧酸盐[(CH_2)_5NH_2]_5BW_(12)O_(40)为催化剂,催化制备双酚A,对双酚A进行熔点测定和红外光谱(IR)分析。探索了酚酮摩尔比、催化剂用量、反应时间等因素对双酚A收率的影响。实验结果表明:溶剂甲苯45 m L,丙酮6 m L(0.08 mol),最佳反应温度45℃,最佳反应时间2.5 h,n(丙酮):n(苯酚):n(催化剂)=1:4:0.03,产物收率达到75%以上。展开更多
以苯酚、丙酮为原料,以自制Keggin型配合物[(CH2)5NH2]4SiW12O40为催化剂,催化合成双酚A,并对目标产物进行了熔点测定、元素分析和红外光谱(IR)分析。考察了酚酮摩尔比、催化剂用量、反应时间等因素对双酚A收率的影响。结果表明:丙酮6 m...以苯酚、丙酮为原料,以自制Keggin型配合物[(CH2)5NH2]4SiW12O40为催化剂,催化合成双酚A,并对目标产物进行了熔点测定、元素分析和红外光谱(IR)分析。考察了酚酮摩尔比、催化剂用量、反应时间等因素对双酚A收率的影响。结果表明:丙酮6 m L(0.08 mol),n(苯酚):n(丙酮):n(催化剂)=4∶1∶0.04,甲苯45 m L,反应温度40℃,反应时间2 h,目标产物收率达到70%以上。展开更多
文摘We and others have firmly established that surface IgM receptor (sIgM-R) crosslinking with antibodies to the i heavy chain (anti-i) leads to growth arrest and apoptosis in a series of well characterized B-cell lymphomas. This requires ablation of c-Myc protein expression and the concomitant induction of the cyclin-dependent-kinase inhibitor, p27Kip1. The signaling mechanisms regulating c-Myc and p27Kip1 protein expression are poorly understood. However, we recently established that sIgM-R mediated down-modulation of the PI-3K pathway directly affected c-Myc and p27Kip1 expression and accurately predicted growth
基金the National Natural Science Foundation of China (Nos.81672724, 8187191 & and 81472573)the Supporting Programs of Shanghai Science and Technology Innovation Action Plan (No.18431902900)+1 种基金the Grant from the State Key Laboratory of Oncogenes and Related Genes (No.91-17-17)the Shanghai Municipal Commission of Health and Family Planning (No.201540213).
文摘Colorectal cancer (CRC) is a common malignant tumor in the digestive tract, and 30%—85% of CRCs express epidermal growth factor receptors (EGFRs). Recently, treatments using cetuximab, also named C225, an anti-EGFR monoclonal antibody, for CRC have been demonstrated to cause an S492R mutation in EGFR. However, little is known about the biological function of S492R EGFR. Therefore, we attempted to elucidate its biological function in CRC cells and explore new treatment strategies for this mutant form. Our study indicated that EGFR and S492R EGFR accelerate the growth of CRC cells in vitro and in vivo and monoclonal antibody CH12, which specifically recognizes an EGFR tumor-specific epitope, can bind efficiently to S492R EGFR. Furthermore, mAb CH12 showed significantly stronger growth suppression activities and induced a more potent antibody-dependent cellular cytotoxicity effect on CRC cells bearing S492R EGFR than mAb C225.mAb CH12 obviously suppressed the growth of CRC xenografts with S492R EGFR mutations in vivo. Thus, mAb CH12 may be a promising therapeutic agent in treating patients with CRC bearing an S492R EGFR mutation.
文摘The title compound H2SiW12O40·(CH3)2NH was synthesized in mixed solvent of aqueous and acetonitrile, and its crystal structure had been determined using single crystal X ray diffraction. The crystal belongs to monoclinic, space group C2/m, a=2.0654(4)nm, b=1.3306(3)nm, c=1.3194(3)nm, β=119.59(3)°, V=3.1531(11)nm3, Dc=3.606Mg·m-3, Z=2, R=0.0462, Rw=0.0836. The title compound comprises of a 2+ unit, a polyanion and a free (CH3)2NH molecule. The ESR spectrum of the title compound shows that charge transfer between organic groups and polyanion takes place under irradiation of the sunlight in solid state. The TG study of the title compound shows that it had four stages of the weight loss, and the increase of the decomposition temperature for the polyanion shows that the stability of the polyanion was enhanced due to the influence of Zn2+ ion. CCDC:175866.
文摘以苯酚、丙酮为原料,以自制的多金属氧酸盐[(CH_2)_5NH_2]_5BW_(12)O_(40)为催化剂,催化制备双酚A,对双酚A进行熔点测定和红外光谱(IR)分析。探索了酚酮摩尔比、催化剂用量、反应时间等因素对双酚A收率的影响。实验结果表明:溶剂甲苯45 m L,丙酮6 m L(0.08 mol),最佳反应温度45℃,最佳反应时间2.5 h,n(丙酮):n(苯酚):n(催化剂)=1:4:0.03,产物收率达到75%以上。
文摘以苯酚、丙酮为原料,以自制Keggin型配合物[(CH2)5NH2]4SiW12O40为催化剂,催化合成双酚A,并对目标产物进行了熔点测定、元素分析和红外光谱(IR)分析。考察了酚酮摩尔比、催化剂用量、反应时间等因素对双酚A收率的影响。结果表明:丙酮6 m L(0.08 mol),n(苯酚):n(丙酮):n(催化剂)=4∶1∶0.04,甲苯45 m L,反应温度40℃,反应时间2 h,目标产物收率达到70%以上。
