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| The “tip” cell, located at the leading edge of an angiogenic sprout, is highly migratory as evident by the presence of filopodia and expresses high levels of VEGFR-2, VEGFR-3, and platelet-derived growth factor-B. In the retina, the tip cells are thought to require high levels of VEGFR-2 to migrate toward a VEGF gradient produced by the underlying astrocyte plane.The “stalk” cell, located adjacent to the tip cell, is proliferative and lumenizing, and it expresses high levels of VEGFR-1. The cellular mechanisms that differentiate a lumenizing stalk cell from a proliferative stalk cell have yet to be elucidated. |
版主 (文壇精英)
| “尖端”細(xì)胞,位于血管生成時(shí)芽的前沿,呈現(xiàn)高度游走性,這一點(diǎn)可以由絲狀偽足的存在得到詮釋,并且表達(dá)高水平的VEGFR-2、VEGFR-3、以及血小板衍生生長因子-B。一般認(rèn)為,視網(wǎng)膜尖端細(xì)胞需要高水平的VEGFR-2,才能移向底層星形膠質(zhì)細(xì)胞層產(chǎn)生的VEGF梯度。“莖/柄”細(xì)胞,相鄰于尖端細(xì)胞,可增殖和lumenizing(光子化?),并且表達(dá)高水平的VEGFR-1。從增殖莖/柄細(xì)胞分化為lumenizing(光子化?)的莖/柄細(xì)胞的細(xì)胞機(jī)制仍有待闡明。 |

版主 (文壇精英)
| “尖端”細(xì)胞,位于血管生成時(shí)芽的前沿,呈現(xiàn)高度游走性,這一點(diǎn)可以由絲狀偽足的存在得到詮釋,并且表達(dá)高水平的VEGFR-2、VEGFR-3、以及血小板衍生生長因子-B。一般認(rèn)為,視網(wǎng)膜尖端細(xì)胞需要高水平的VEGFR-2,才能移向底層星形膠質(zhì)細(xì)胞層產(chǎn)生的VEGF梯度。“莖/柄”細(xì)胞,相鄰于尖端細(xì)胞,可增殖和形成管腔,并且表達(dá)高水平的VEGFR-1。從增殖性莖/柄細(xì)胞分化為l管腔形成性的莖/柄細(xì)胞的細(xì)胞機(jī)制仍有待闡明。 |

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