Recombinant human erythropoietin-induced erythropoiesis regulates hepcidin expression over iron status in the rat.
The crosstalk between several factors controlling hepcidin synthesis is poorly clarified for different physiological and pathological conditions. Our aim was to study the impact of increasing recombinant human erythropoietin (rHuEPO) doses on erythropoiesis, iron metabolism and hepcidin, using a rat model. Male Wistar rats were divided in 5 groups: control (vehicle) and rHuEPO-treated groups (100, 200, 400 and 600IU/kgbody weight/week), 3 times per week, during 3weeks. Hematological and iron data were evaluated. The expression of several genes involved in iron metabolism was analyzed by qPCR. Liver hepcidin protein was evaluated by Western Blot. The rHuEPO treatment induced erythropoiesis and increased transferrin saturation (TSAT) in a dose dependent manner. Tf receptor 2 (TfR2), hemojuvelin (HJV) and bone morphogenetic protein 6 (BMP6) were up-regulated in rHuEPO200 group. Matriptase-2 was down-regulated in rHuEPO200 group, and up-regulated in the other rHuEPO-treated groups. Hepcidin synthesis was increased in rHuEPO200 group, and repressed in the rHuEPO400 and rHuEPO600 groups. Our study showed that when a high erythropoietic stimulus occurs, hepcidin synthesis is mainly regulated by TSAT; however, when the erythropoiesis rate reaches a specific threshold, extramedullary hematopoiesis is triggered, and the control of hepcidin synthesis is switched to matriptase-2, thus inhibiting hepcidin synthesis.
Research Unit on Applied Molecular Biosciences (UCIBIO), REQUIMTE, Department of Biological Sciences, Laboratory of Biochemistry, Faculty of Pharmacy, University of Porto, Porto, Portugal.
Sandra
S
Ribeiro
Laboratory of Pharmacology & Experimental Therapeutics, Institute for Biomedical Imaging and Life Sciences (IBILI), Faculty of Medicine, University of Coimbra, Coimbra, Portugal.
Patrícia
P
Garrido
Laboratory of Pharmacology & Experimental Therapeutics, Institute for Biomedical Imaging and Life Sciences (IBILI), Faculty of Medicine, University of Coimbra, Coimbra, Portugal; Center for Neuroscience and Cell Biology - Institute for Biomedical Imaging and Life Sciences (CNC.IBILI) Research Unit, University of Coimbra, Coimbra, Portugal.
João
J
Fernandes
Research Unit on Applied Molecular Biosciences (UCIBIO), REQUIMTE, Department of Biological Sciences, Laboratory of Biochemistry, Faculty of Pharmacy, University of Porto, Porto, Portugal.
Susana
S
Rocha
Research Unit on Applied Molecular Biosciences (UCIBIO), REQUIMTE, Department of Biological Sciences, Laboratory of Biochemistry, Faculty of Pharmacy, University of Porto, Porto, Portugal; Health Sciences Research Centre, Faculty of Health Sciences, University of Beira Interior, Covilhã, Portugal.
Petronila
P
Rocha-Pereira
Research Unit on Applied Molecular Biosciences (UCIBIO), REQUIMTE, Department of Biological Sciences, Laboratory of Biochemistry, Faculty of Pharmacy, University of Porto, Porto, Portugal.
Elísio
E
Costa
Research Unit on Applied Molecular Biosciences (UCIBIO), REQUIMTE, Department of Biological Sciences, Laboratory of Biochemistry, Faculty of Pharmacy, University of Porto, Porto, Portugal.
Luís
L
Belo
Laboratory of Pharmacology & Experimental Therapeutics, Institute for Biomedical Imaging and Life Sciences (IBILI), Faculty of Medicine, University of Coimbra, Coimbra, Portugal; Center for Neuroscience and Cell Biology - Institute for Biomedical Imaging and Life Sciences (CNC.IBILI) Research Unit, University of Coimbra, Coimbra, Portugal.
Flávio
F
Reis
Research Unit on Applied Molecular Biosciences (UCIBIO), REQUIMTE, Department of Biological Sciences, Laboratory of Biochemistry, Faculty of Pharmacy, University of Porto, Porto, Portugal. Electronic address: assilva@ff.up.pt.
Alice
A
Santos-Silva
D000818:Animals; D004305:Dose-Response Relationship, Drug; D004920:Erythropoiesis / Q000187:drug effects / Q000502:physiology*; D004921:Erythropoietin / Q000494:pharmacology* / Q000627:therapeutic use; D005786:Gene Expression Regulation; D064451:Hepcidins / Q000032:analysis / Q000096:biosynthesis / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D007501:Iron / Q000378:metabolism*; D008297:Male; D008565:Membrane Proteins / Q000502:physiology; D051381:Rats; D017208:Rats, Wistar; D011994:Recombinant Proteins / Q000627:therapeutic use; D012697:Serine Endopeptidases / Q000502:physiology; D014168:Transferrin / Q000502:physiology
D064451:Hepcidins; D008565:Membrane Proteins; D011994:Recombinant Proteins; D014168:Transferrin; D004921:Erythropoietin; D007501:Iron; D012697:Serine Endopeptidases; C467801:matriptase 2
Erythropoiesis; Hepcidin; Iron; Matriptase-2; Transferrin saturation