美国斯坦福大学Calvin J. Kuo等研究人员合作开发出人类远端肺脏的类器官模型。该研究于2020年11月25日在线发表于国际一流学术期刊《自然》。
Title: Progenitor identification and SARS-CoV-2 infection in human distal lung organoids
Author: Ameen A. Salahudeen, Shannon S. Choi, Arjun Rustagi, Junjie Zhu, Vincent van Unen, Sean M. de la O, Ryan A. Flynn, Mar Margalef-Catal, Antnio J. M. Santos, Jihang Ju, Arpit Batish, Tatsuya Usui, Grace X. Y. Zheng, Caitlin E. Edwards, Lisa E. Wagar, Vincent Luca, Benedict Anchang, Monica Nagendran, Khanh Nguyen, Daniel J. Hart, Jessica M. Terry, Phillip Belgrader, Solongo B. Ziraldo, Tarjei S. Mikkelsen, Pehr B. Harbury, Jeffrey S. Glenn, K. Christopher Garcia, Mark M. Davis, Ralph S. Baric, Chiara Sabatti, Manuel R. Amieva, Catherine A. Blish, Tushar J. Desai, Calvin J. Kuo
Abstract: The distal lung contains terminal bronchioles and alveoli that facilitate gas exchange. Three-dimensional in vitro human distal lung culture systems would strongly facilitate investigation of pathologies including interstitial lung disease, cancer, and SARS-CoV-2-associated COVID-19 pneumonia. We generated long-term feeder-free, chemically defined culture of distal lung progenitors as organoids derived from single adult human alveolar epithelial type II (AT2) or KRT5+ basal cells. AT2 organoids exhibited AT1 transdifferentiation potential while basal cell organoids developed lumens lined by differentiated club and ciliated cells. Single cell analysis of basal organoid KRT5+ cells revealed a distinct ITGA6+ITGB4+ mitotic population whose proliferation further segregated to a TNFRSF12Ahi subfraction comprising ~10% of KRT5+ basal cells, residing in clusters within terminal bronchioles and exhibiting enriched clonogenic organoid growth activity. Distal lung organoids were created with apical-out polarity to display ACE2 on the exposed external surface, facilitating SARS-CoV-2 infection of AT2 and basal cultures and identifying club cells as a novel target population. This long-term, feeder-free organoid culture of human distal lung, coupled with single cell analysis, identifies unsuspected basal cell functional heterogeneity and establishes a facile in vitro organoid model for human distal lung infections including COVID-19-associated pneumonia.