Inflammation-Induced Expression and Secretion of MicroRNA 122 Leads to Reduced Blood Levels of Kidney-derived Erythropoietin and Anemia
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Inflammation-Induced Expression and Secretion of MicroRNA 122 Leads to Reduced Blood Levels of Kidney-derived Erythropoietin and Anemia. / Rivkin, Mila; Simerzin, Alina; Zorde-Khvalevsky, Elina; Chai, Chofit; Yuval, Jonathan B; Rosenberg, Nofar; Harari-Steinfeld, Rona; Schneider, Ronen; Amir, Gail; Condiotti, Reba; Heikenwalder, Mathias; Weber, Achim; Schramm, Christoph; Wege, Henning; Kluwe, Johannes; Galun, Eithan; Giladi, Hilla.
in: GASTROENTEROLOGY, Jahrgang 151, Nr. 5, 11.2016, S. 999-1010.e3.Publikationen: SCORING: Beitrag in Fachzeitschrift/Zeitung › SCORING: Zeitschriftenaufsatz › Forschung › Begutachtung
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TY - JOUR
T1 - Inflammation-Induced Expression and Secretion of MicroRNA 122 Leads to Reduced Blood Levels of Kidney-derived Erythropoietin and Anemia
AU - Rivkin, Mila
AU - Simerzin, Alina
AU - Zorde-Khvalevsky, Elina
AU - Chai, Chofit
AU - Yuval, Jonathan B
AU - Rosenberg, Nofar
AU - Harari-Steinfeld, Rona
AU - Schneider, Ronen
AU - Amir, Gail
AU - Condiotti, Reba
AU - Heikenwalder, Mathias
AU - Weber, Achim
AU - Schramm, Christoph
AU - Wege, Henning
AU - Kluwe, Johannes
AU - Galun, Eithan
AU - Giladi, Hilla
N1 - Copyright © 2016 AGA Institute. Published by Elsevier Inc. All rights reserved.
PY - 2016/11
Y1 - 2016/11
N2 - BACKGROUND & AIM: Anemia is commonly associated with acute and chronic inflammation, but the mechanisms of their interaction are not clear. We investigated whether microRNA 122 (MIR122), which is generated in the liver and is secreted into the blood, is involved in the development of anemia associated with inflammation.METHODS: We characterized the primary transcript of the human liver-specific MIR122 using northern blot, quantitative real-time PCR, and 3' and 5' RACE analyses. We studied regulation of MIR122 in human hepatocellular carcinoma (HCC) cell lines (Huh7 and HepG2) as well as in C57BL/6 and mice with disruption of the tumor necrosis factor gene (Tnf). Liver tissues were collected and analyzed by bioluminescence imaging or immunofluorescence. Inflammation in mice was induced by lipopolysaccharide (LPS) or by cerulein injections. Mice were given 4 successive injections of LPS, leading to inflammation-induced anemia. Steatohepatitis was induced with a choline-deficient high-fat diet. Hemolytic anemia was stimulated by phenylhydrazine injection. MIR122 was inhibited in mice by tail-vein injection of antogomiR-122 (an oligonucleotide antagonist of MIR122). MicroRNA and mRNA levels were determined by quantitative real time PCR.RESULTS: The primary transcript of MIR122 spanned 5 kb, comprising 3 exons; the third encodes MIR122. Within the MIR122 promoter region we identified a nuclear factor-κB (NF-κB) binding site and demonstrated that RELA, as well as activators of NF-κB (TNF and LPS), increased promoter activity of MIR122. Administration of LPS to mice induced secretion of MIR122 into blood, which required TNF. Secreted MIR122 reached the kidney and reduced expression of erythropoietin (Epo), which we identified as a MIR122 target gene. Injection of mice with antagomiR-122 increased blood levels of EPO, reticulocytes, and hemoglobin. We found an inverse relationship between blood levels of MIR122 and EPO in mice with acute pancreatitis or steatohepatitis, and also in patients with acute inflammation.CONCLUSION: In mice, we found that LPS-induced inflammation increases blood levels of MIR122, which reduces expression of Epo in the kidney; this is a mechanism of inflammation-induced anemia. Strategies to block MIR122 in patients with inflammation could reduce the development or progression of anemia.
AB - BACKGROUND & AIM: Anemia is commonly associated with acute and chronic inflammation, but the mechanisms of their interaction are not clear. We investigated whether microRNA 122 (MIR122), which is generated in the liver and is secreted into the blood, is involved in the development of anemia associated with inflammation.METHODS: We characterized the primary transcript of the human liver-specific MIR122 using northern blot, quantitative real-time PCR, and 3' and 5' RACE analyses. We studied regulation of MIR122 in human hepatocellular carcinoma (HCC) cell lines (Huh7 and HepG2) as well as in C57BL/6 and mice with disruption of the tumor necrosis factor gene (Tnf). Liver tissues were collected and analyzed by bioluminescence imaging or immunofluorescence. Inflammation in mice was induced by lipopolysaccharide (LPS) or by cerulein injections. Mice were given 4 successive injections of LPS, leading to inflammation-induced anemia. Steatohepatitis was induced with a choline-deficient high-fat diet. Hemolytic anemia was stimulated by phenylhydrazine injection. MIR122 was inhibited in mice by tail-vein injection of antogomiR-122 (an oligonucleotide antagonist of MIR122). MicroRNA and mRNA levels were determined by quantitative real time PCR.RESULTS: The primary transcript of MIR122 spanned 5 kb, comprising 3 exons; the third encodes MIR122. Within the MIR122 promoter region we identified a nuclear factor-κB (NF-κB) binding site and demonstrated that RELA, as well as activators of NF-κB (TNF and LPS), increased promoter activity of MIR122. Administration of LPS to mice induced secretion of MIR122 into blood, which required TNF. Secreted MIR122 reached the kidney and reduced expression of erythropoietin (Epo), which we identified as a MIR122 target gene. Injection of mice with antagomiR-122 increased blood levels of EPO, reticulocytes, and hemoglobin. We found an inverse relationship between blood levels of MIR122 and EPO in mice with acute pancreatitis or steatohepatitis, and also in patients with acute inflammation.CONCLUSION: In mice, we found that LPS-induced inflammation increases blood levels of MIR122, which reduces expression of Epo in the kidney; this is a mechanism of inflammation-induced anemia. Strategies to block MIR122 in patients with inflammation could reduce the development or progression of anemia.
U2 - 10.1053/j.gastro.2016.07.031
DO - 10.1053/j.gastro.2016.07.031
M3 - SCORING: Journal article
C2 - 27477940
VL - 151
SP - 999-1010.e3
JO - GASTROENTEROLOGY
JF - GASTROENTEROLOGY
SN - 0016-5085
IS - 5
ER -