Dostalikova-Cimburova Marketa, Balusikova Kamila, Kratka Karolina, Chmelikova Jitka, Hejda Vaclav, Hnanicek Jan, Neubauerova Jitka, Vranova Jana, Kovar Jan, Horak Jiri
Department of Cell and Molecular Biology, Third Faculty of Medicine, Charles University Prague, Prague, Czech Republic.
J Cell Mol Med. 2014 Sep;18(9):1840-50. doi: 10.1111/jcmm.12310. Epub 2014 Jun 3.
Patients with alcoholic liver disease (ALD) often display disturbed iron indices. Hepcidin, a key regulator of iron metabolism, has been shown to be down-regulated by alcohol in cell lines and animal models. This down-regulation led to increased duodenal iron transport and absorption in animals. In this study, we investigated gene expression of duodenal iron transport molecules and hepcidin in three groups of patients with ALD (with anaemia, with iron overload and without iron overload) and controls. Expression of DMT1, FPN1, DCYTB, HEPH, HFE and TFR1 was measured in duodenal biopsies by using real-time PCR and Western blot. Serum hepcidin levels were measured by using ELISA. Serum hepcidin was decreased in patients with ALD. At the mRNA level, expressions of DMT1, FPN1 and TFR1 genes were significantly increased in ALD. This pattern was even more pronounced in the subgroups of patients without iron overload and with anaemia. Protein expression of FPN1 paralleled the increase at the mRNA level in the group of patients with ALD. Serum ferritin was negatively correlated with DMT1 mRNA. The down-regulation of hepcidin expression leading to up-regulation of iron transporters expression in the duodenum seems to explain iron metabolism disturbances in ALD. Alcohol consumption very probably causes suppression of hepcidin expression in patients with ALD.
酒精性肝病(ALD)患者常出现铁指标紊乱。铁调素是铁代谢的关键调节因子,在细胞系和动物模型中已显示其受酒精下调。这种下调导致动物十二指肠铁转运和吸收增加。在本研究中,我们调查了三组ALD患者(贫血、铁过载和无铁过载)及对照组十二指肠铁转运分子和铁调素的基因表达。通过实时PCR和蛋白质印迹法检测十二指肠活检组织中DMT1、FPN1、DCYTB、HEPH、HFE和TFR1的表达。采用酶联免疫吸附测定法检测血清铁调素水平。ALD患者血清铁调素降低。在mRNA水平,ALD患者中DMT1、FPN1和TFR1基因的表达显著增加。这种模式在无铁过载且贫血的患者亚组中更为明显。ALD患者组中FPN1的蛋白表达与mRNA水平的增加平行。血清铁蛋白与DMT1 mRNA呈负相关。铁调素表达下调导致十二指肠中铁转运蛋白表达上调,这似乎解释了ALD中铁代谢紊乱的原因。饮酒很可能导致ALD患者铁调素表达受抑制。