樹突狀細胞來源的鐵調素通過螯合微生物群中的鐵促進黏膜癒合
作者:
小柯機器人發布時間:2020/4/11 13:46:02
樹突狀細胞來源的鐵調素可以螯合微生物群中的鐵以促進黏膜癒合,這一成果由美國康奈爾大學Gregory F. Sonnenberg和巴黎大學Carole Peyssonnaux研究組取得。該研究成果於2020年4月10日發表在《科學》上。
研究人員發現在實驗性損傷後,系統鐵穩態的主要調節劑鐵調素對於小鼠腸道組織修復必不可少。該修復作用與肝細胞來源的鐵調素或全身鐵水平無關。
相反,研究人員確定經典樹突狀細胞(cDCs)是鐵調素的來源。鐵調素是由小鼠體內微生物刺激產生的,特別是在人類發炎的腸道中並且對於組織修復至關重要。cDC產生的鐵調素作用於表達鐵轉運蛋白的吞噬細胞,以促進局部鐵螯合進而調節微生物群,最終促進腸道修復。
總體而言,這些結果揭示了cDC來源的鐵調素通過營養免疫促進腸道黏膜癒合的調控途徑。
據介紹,在多種胃腸道疾病中會發生出血和鐵分布改變,但這些變化的重要性和調節機制尚不清楚。
附:英文原文
Title: Dendritic cell–derived hepcidin sequesters iron from the microbiota to promote mucosal healing
Author: Nicholas J. Bessman, Jacques R. R. Mathieu, Cyril Renassia, Lei Zhou, Thomas C. Fung, Keith C. Fernandez, Christine Austin, Jesper B. Moeller, Sara Zumerle, Sabine Louis, Sophie Vaulont, Nadim J. Ajami, Harry Sokol, Gregory G. Putzel, Tara Arvedson, Robbyn E. Sockolow, Samira Lakhal-Littleton, Suzanne M. Cloonan, Manish Arora, Carole Peyssonnaux, Gregory F. Sonnenberg
Issue&Volume: 2020/04/10
Abstract: Abstract
Bleeding and altered iron distribution occur in multiple gastrointestinal diseases, but the importance and regulation of these changes remain unclear. We found that hepcidin, the master regulator of systemic iron homeostasis, is required for tissue repair in the mouse intestine after experimental damage. This effect was independent of hepatocyte-derived hepcidin or systemic iron levels. Rather, we identified conventional dendritic cells (cDCs) as a source of hepcidin that is induced by microbial stimulation in mice, prominent in the inflamed intestine of humans, and essential for tissue repair. cDC-derived hepcidin acted on ferroportin-expressing phagocytes to promote local iron sequestration, which regulated the microbiota and consequently facilitated intestinal repair. Collectively, these results identify a pathway whereby cDC-derived hepcidin promotes mucosal healing in the intestine through means of nutritional immunity.
DOI: 10.1126/science.aau6481
Source: https://science.sciencemag.org/content/368/6487/186
Science:《科學》,創刊於1880年。隸屬於美國科學促進會,最新IF:41.037