研究發現人樹突狀細胞的兩條發育途徑對IRF8偏好性不同
作者:
小柯機器人發布時間:2020/8/2 23:20:51
英國紐卡斯爾大學Venetia Bigley團隊在研究中取得進展。他們發現人樹突狀細胞(DCs)的兩種發育途徑需要不同濃度的IRF8轉錄因子。 這一研究成果在線發表在2020年7月30日出版的國際學術期刊《免疫》上。
使用高維分析、體外分化和人IRF8等位基因缺失譜系,研究人員證明了cDC2(CD1c + DC)異質性源於兩種不同的發育途徑。表達CD123和BTLA的接觸淋巴IRF8hi途徑帶有漿細胞樣DC(pDC)、cDC1和DC2印記,而表達SIRPA的常見髓樣IRF8lo途徑形成DC3和單核細胞。研究人員通過粒細胞-巨噬細胞祖細胞(GMP)區室追蹤到不同的發育軌跡,表明AXL+ SIGLEC6+ pre-DC僅映射到DC2途徑。為了滿足對IRF8較低的需求,人DC3發育為替代部分IRF8缺乏症中的DC2。
據悉,哺乳動物DCs的形成受多種造血轉錄因子(包括IRF8)的調控。IRF8缺失對DC亞群(包括pDC和常規DC譜系cDC1和cDC2)產生不同的影響。在人體中已經發現了與cDC2相關的亞型,包括AXL+ SIGLEC6+ pre-DC、DC2和DC3。但這種異質性的起源是未知的。
附:英文原文
Title: Differential IRF8 Transcription Factor Requirement Defines Two Pathways of Dendritic Cell Development in Humans
Author: Urszula Cytlak, Anastasia Resteu, Sarah Pagan, Kile Green, Paul Milne, Sheetal Maisuria, David McDonald, Gillian Hulme, Andrew Filby, Benjamin Carpenter, Rachel Queen, Sophie Hambleton, Rosie Hague, Hana Lango Allen, James E.D. Thaventhiran, Gina Doody, Matthew Collin, Venetia Bigley
Issue&Volume: 2020-07-30
Abstract: The formation of mammalian dendritic cells (DCs) is controlled by multiple hematopoietic transcription factors, including IRF8. Loss of IRF8 exerts a differential effect on DC subsets, including plasmacytoid DCs (pDCs) and the classical DC lineages cDC1 and cDC2. In humans, cDC2-related subsets have been described including AXL+SIGLEC6+ pre-DC, DC2 and DC3. The origin of this heterogeneity is unknown. Using high-dimensional analysis, in vitro differentiation, and an allelic series of human IRF8 deficiency, we demonstrated that cDC2 (CD1c+DC) heterogeneity originates from two distinct pathways of development. The lymphoid-primed IRF8hi pathway, marked by CD123 and BTLA, carried pDC, cDC1, and DC2 trajectories, while the common myeloid IRF8lo pathway, expressing SIRPA, formed DC3s and monocytes. We traced distinct trajectories through the granulocyte-macrophage progenitor (GMP) compartment showing that AXL+SIGLEC6+ pre-DCs mapped exclusively to the DC2 pathway. In keeping with their lower requirement for IRF8, DC3s expand to replace DC2s in human partial IRF8 deficiency.
DOI: 10.1016/j.immuni.2020.07.003
Source: https://www.cell.com/immunity/fulltext/S1074-7613(20)30283-1