Angiogenesis,a process by which the preexisting blood vasculature gives rise to new capillary vessels,is associated with a variety of physiologic and pathologic conditions.However,the molecular mechanism underlying th...Angiogenesis,a process by which the preexisting blood vasculature gives rise to new capillary vessels,is associated with a variety of physiologic and pathologic conditions.However,the molecular mechanism underlying this important process remains poorly understood.Here we show that histone deacetylase 6(HDAC6),a microtubule-associated enzyme critical for cell motility,contributes to angiogenesis by regulating the polarization and migration of vascular endothelial cells.Inhibition of HDAC6 activity impairs the formation of new blood vessels in chick embryos and in angioreactors implanted in mice.The requirement for HDAC6 in angiogenesis is corroborated in vitro by analysis of endothelial tube formation and capillary sprouting.Our data further show that HDAC6 stimulates membrane ruffling at the leading edge to promote cell polarization.In addition,microtubule end binding protein 1(EB1)is important for HDAC6 to exert its activity towards the migration of endothelial cells and generation of capillary-like structures.These results thus identify HDAC6 as a novel player in the angiogenic process and offer novel insights into the molecular mechanism governing endothelial cell migration and angiogenesis.展开更多
目的探讨末端结合蛋白1(end-binding protein 1,EB1)在宫颈组织中的表达及其对自噬标志蛋白LC3和p62/SQSTM1蛋白表达的影响。方法免疫组织化学检测EB1在宫颈癌、宫颈息肉和慢性宫颈炎组织中的表达;siRNA干扰方法抑制EB1基因表达,并采用...目的探讨末端结合蛋白1(end-binding protein 1,EB1)在宫颈组织中的表达及其对自噬标志蛋白LC3和p62/SQSTM1蛋白表达的影响。方法免疫组织化学检测EB1在宫颈癌、宫颈息肉和慢性宫颈炎组织中的表达;siRNA干扰方法抑制EB1基因表达,并采用实时荧光定量PCR和Western blot方法检测此时宫颈癌Siha细胞自噬标志蛋白LC3和p62/SQSTM1基因的表达。结果 EB1的表达部位主要集中在细胞核外周的胞质中。EB1在宫颈癌和宫颈息肉中的阳性表达率显著低于宫颈慢性炎性组织(P<0.05),但在阳性表达的宫颈癌组织中,绝大多数间质细胞表现为阴性;EB1在中、低分化宫颈鳞癌组织中的阳性表达率显著低于高分化宫颈鳞癌组织(P<0.05)。当EB1基因表达在宫颈癌Siha细胞中的表达被抑制时,无论是在mRNA还是在蛋白水平,自噬标志蛋白p62/SQSTM1和LC3的表达均显著增加(P<0.05)。结论 EB1在自噬发生较低的宫颈癌组织中阳性表达率低于自噬发生较高的宫颈慢性炎性组织;抑制EB1在宫颈癌Siha细胞中的表达,则自噬标志蛋白p62/SQSTM1和LC3表达改变,这一发现充分证明EB1在宫颈癌的自噬过程中发挥着一定的生物学效应。展开更多
基金the National Natural Science Foundation of China(Grant Nos.30825022 and 90913021)the Fok Ying Tung Education Foundation(Grant No.111036)the National Basic Research Program of China(Grant No.2007CB914802).
文摘Angiogenesis,a process by which the preexisting blood vasculature gives rise to new capillary vessels,is associated with a variety of physiologic and pathologic conditions.However,the molecular mechanism underlying this important process remains poorly understood.Here we show that histone deacetylase 6(HDAC6),a microtubule-associated enzyme critical for cell motility,contributes to angiogenesis by regulating the polarization and migration of vascular endothelial cells.Inhibition of HDAC6 activity impairs the formation of new blood vessels in chick embryos and in angioreactors implanted in mice.The requirement for HDAC6 in angiogenesis is corroborated in vitro by analysis of endothelial tube formation and capillary sprouting.Our data further show that HDAC6 stimulates membrane ruffling at the leading edge to promote cell polarization.In addition,microtubule end binding protein 1(EB1)is important for HDAC6 to exert its activity towards the migration of endothelial cells and generation of capillary-like structures.These results thus identify HDAC6 as a novel player in the angiogenic process and offer novel insights into the molecular mechanism governing endothelial cell migration and angiogenesis.
