{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,8]],"date-time":"2026-04-08T15:35:17Z","timestamp":1775662517160,"version":"3.50.1"},"reference-count":45,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2022,1,18]],"date-time":"2022-01-18T00:00:00Z","timestamp":1642464000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Investissements d\u2019avenir","award":["ANR-11-IDEX-0005-02"],"award-info":[{"award-number":["ANR-11-IDEX-0005-02"]}]},{"name":"labex GR-Ex","award":["ANR-11-LABX-0051"],"award-info":[{"award-number":["ANR-11-LABX-0051"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Metabolites"],"abstract":"<jats:p>Iron absorption requires an acidic environment that is generated by the activity of the proton pump gastric H(+)\/K(+)ATPase (ATP4), expressed in gastric parietal cells. However, hepcidin, the iron regulatory peptide that inhibits iron absorption, unexpectedly upregulates ATP4 and increases gastric acidity. Thus, a concept of link between acidosis and alterations in iron metabolism, needs to be explored. We investigated this aspect in-vivo using experimental models of NH4Cl-induced acidosis and of an iron-rich diet. Under acidosis, gastric ATP4 was augmented. Serum hepcidin was induced and its mRNA level was increased in the liver but not in the stomach, a tissue where hepcidin is also expressed. mRNA and protein levels of intestinal DMT1(Divalent Metal Transporter 1) and ferroportin were downregulated. Serum iron level and transferrin saturation remained unchanged, but serum ferritin was significantly increased. Under iron-rich diet, the protein expression of ATP4A was increased and serum, hepatic and gastric hepcidin were all induced. Taken together, these results provide evidence of in-vivo relationship between iron metabolism and acidosis. For clinical importance, we speculate that metabolic acidosis may contribute in part to the pathologic elevation of serum hepcidin levels seen in patients with chronic kidney disease. The regulation of ATP4 by iron metabolism may also be of interest for patients with hemochromatosis.<\/jats:p>","DOI":"10.3390\/metabo12020089","type":"journal-article","created":{"date-parts":[[2022,1,18]],"date-time":"2022-01-18T22:46:32Z","timestamp":1642545992000},"page":"89","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Crosstalk between Acidosis and Iron Metabolism: Data from In Vivo Studies"],"prefix":"10.3390","volume":"12","author":[{"given":"Ra\u00ead","family":"Daher","sequence":"first","affiliation":[{"name":"Centre de Recherche sur l\u2019Inflammation (CRI), Universit\u00e9 de Paris, INSERM, CNRS, F-75018 Paris, France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nicolas","family":"Ducrot","sequence":"additional","affiliation":[{"name":"Centre de Recherche sur l\u2019Inflammation (CRI), Universit\u00e9 de Paris, INSERM, CNRS, F-75018 Paris, France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Thibaud","family":"Lefebvre","sequence":"additional","affiliation":[{"name":"Centre de Recherche sur l\u2019Inflammation (CRI), Universit\u00e9 de Paris, INSERM, CNRS, F-75018 Paris, France"},{"name":"Centre Fran\u00e7ais des Porphyries, H\u00f4pital Louis Mourier, APHP, Nord-Universit\u00e9 de Paris, F-75014 Colombes, France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sofia","family":"Zineeddine","sequence":"additional","affiliation":[{"name":"Centre de Recherche sur l\u2019Inflammation (CRI), Universit\u00e9 de Paris, INSERM, CNRS, F-75018 Paris, France"},{"name":"Institut Toulousain des Maladies Infectieuses et Inflammatoires (Infinity), Universit\u00e9 de Toulouse, INSERM, CNRS, F-31024 Toulouse, France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"J\u00e9rome","family":"Ausseil","sequence":"additional","affiliation":[{"name":"Institut Toulousain des Maladies Infectieuses et Inflammatoires (Infinity), Universit\u00e9 de Toulouse, INSERM, CNRS, F-31024 Toulouse, France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Herv\u00e9","family":"Puy","sequence":"additional","affiliation":[{"name":"Centre de Recherche sur l\u2019Inflammation (CRI), Universit\u00e9 de Paris, INSERM, CNRS, F-75018 Paris, France"},{"name":"Centre Fran\u00e7ais des Porphyries, H\u00f4pital Louis Mourier, APHP, Nord-Universit\u00e9 de Paris, F-75014 Colombes, France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3724-5592","authenticated-orcid":false,"given":"Zoubida","family":"Karim","sequence":"additional","affiliation":[{"name":"Centre de Recherche sur l\u2019Inflammation (CRI), Universit\u00e9 de Paris, INSERM, CNRS, F-75018 Paris, France"},{"name":"Institut Toulousain des Maladies Infectieuses et Inflammatoires (Infinity), Universit\u00e9 de Toulouse, INSERM, CNRS, F-31024 Toulouse, France"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2022,1,18]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1755","DOI":"10.1126\/science.1057206","article-title":"An Iron-Regulated Ferric Reductase Associated with the Absorption of Dietary Iron","volume":"291","author":"McKie","year":"2001","journal-title":"Science"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"299","DOI":"10.1016\/S1097-2765(00)80425-6","article-title":"A Novel Duodenal Iron-Regulated Transporter, IREG1, Implicated in the Basolateral Transfer of Iron to the Circulation","volume":"5","author":"McKie","year":"2000","journal-title":"Mol. 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