
Developmental Cell:华裔博导发现Wnt途径新机制
原始出处:
Developmental Cell, Vol , Issue
The Retromer Complex Influences Wnt Secretion by Recycling Wntless from Endosomes to the Trans-Golgi Network
1 Division of Developmental Biology, University of Cincinnati College of Medicine, Cincinnati, OH 45229, USA
2 The Graduate Program in Molecular and Developmental Biology, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, Cincinnati, OH 45229, USA
3 Department of Biological Sciences, University of Delaware, Newark, DE 19716, USA
Corresponding author
Xinhua Lin
xinhua.lin@cchmc.org
Summary
Secreted Wnt proteins play essential roles in many biological processes during development and diseases. However, little is known about the mechanism(s) controlling Wnt secretion. Recent studies have identified Wntless (Wls) and the retromer complex as essential components involved in Wnt signaling. While Wls has been shown to be essential for Wnt secretion, the function(s) of the retromer complex in Wnt signaling is unknown. Here, we have examined a role of Vps35, an essential retromer subunit, in Wnt signaling in Drosophila and mammalian cells. We provide compelling evidence that the retromer complex is required for Wnt secretion. Importantly, Vps35 colocalizes in endosomes and interacts with Wls. Wls becomes unstable in the absence of retromer activity. Our findings link Wls and retromer functions in the same conserved Wnt secretion pathway. We propose that retromer influences Wnt secretion by recycling Wntless from endosomes to the trans-Golgi network (TGN).
附:
读了31年书的教授
林鑫华,1962年生于浙江上虞,1969年读小学,1980年考入杭州大学生物系,1984年考入中国科学院细胞研究所攻读博
士,1989年留学美国圣路易斯市华盛顿大学,1995年在哈佛大学做博士后,现任辛辛那提儿童医院教授。
辛辛那提市儿童医院是美国著名的医院,医学研究名列全美前三名。这一点与中国有很大区别,中国的城市规模决定了城市在政治、经济、文化、卫生、科技等几乎所有方面的地位。但美国不是,按规模,辛辛那提算不上大城市,美国地区差别远没有中国那么明显。
那天,我去这家医院拜访林鑫华教授。我们在大楼里左弯右拐,如进了迷宫,最终还是在实验室工作人员的带领下,经过一道道门,一道道岗,一次次刷卡,才找到林教授的办公室。看来这里戒备森严。
林教授是个南方人,听口音是江浙一带人,中等身材,有着江南人特有的清秀,嗓音很是清脆,洪亮,说来话来,神采飞扬,朗声大笑,笑得通透,笑得自信。
在辛辛那提大学,我接触了很多中国留学生,我慨叹于他们读书时间之长,有的在国内读完本科,有的已经拿到了硕士学位,继续到美国求学,读书时间都在20年以上,占去生命的三分之一左右。林鑫华教授堪称其中的冠军,前后总共读了31年书,而且中间从来没有任何停顿,这引起了我的浓厚兴趣。
林鑫华求学时间漫长,但经历却很简单,一路读书过来,小学,中学,大学,研究所,出国读博士,做博士后,然后当教授。一直到现在仍然没有离开学校。他接触的人很单纯——学者,教授,学生,他的研究属于基础科学,纯理论,就是我们常说的象牙塔,这是我见过的最纯粹的学者之一。
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