转铁蛋白
转铁蛋白饱和度
红细胞生成
十二指肠
转铁蛋白受体
生物
血色病
化学
mTORC1型
内分泌学
内科学
生物化学
铁蛋白
贫血
磷酸化
医学
蛋白激酶B
血清铁蛋白
作者
Nyamdelger Sukhbaatar,Maria Schöller,Stephanie Deborah Fritsch,Monika Linke,Stefanie Horer,Manuela Träger,Mario Mazic,Stephan Forisch,Karine Gonzales,Jan Kähler,Carina Binder,Caroline Lassnig,Birgit Strobl,Mathias Müller,Barbara Scheiber‐Mojdehkar,Claudia Gundacker,S Dabsch,Renate Kain,Markus Hengstschläger,Steven H. L. Verhelst,Günter Weiß,Igor Theurl,Thomas Weichhart
出处
期刊:Blood
[American Society of Hematology]
日期:2023-04-05
被引量:5
标识
DOI:10.1182/blood.2022016632
摘要
Iron is an essential cellular metal that is important for many physiological functions including erythropoiesis and host defense. It is absorbed from the diet in the duodenum and loaded onto transferrin, the main iron transport protein. Inefficient dietary iron uptake promotes many diseases, but mechanisms regulating iron absorption remain poorly understood. By assessing mice that harbor a macrophage-specific deletion of the tuberous sclerosis complex 2 (Tsc2), a negative regulator of mTORC1, we found that these mice possessed various defects in iron metabolism including defective steady state erythropoiesis and a reduced saturation of transferrin with iron. This iron-deficiency phenotype was associated with an iron import block from the duodenal epithelial cells into the circulation. Activation of mTORC1 in villous duodenal CD68+ macrophages induced serine protease expression and promoted local degradation of transferrin, whereas depletion of macrophages in mice increased transferrin levels. Inhibition of mTORC1 with everolimus or serine protease activity with nafamostat restored transferrin levels in the Tsc2-deficient mice as well as transferrin saturation. Physiologically, transferrin levels were regulated in the duodenum during the prandial process and Citrobacter rodentium infection. These data suggest that duodenal macrophages determine iron transfer to the circulation by controlling transferrin availability in the lamina propria villi.
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