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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Lipopolysaccharide infusion up-regulates hepcidin mRNA expression in equine liver

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Author(s):
Oliveira-Filho, Jose P. [1] ; Badial, Peres R. [1] ; Cunha, Paulo H. J. [1] ; Peiro, Juliana R. [1] ; Araujo, Jr., Joao P. [1] ; Divers, Thomas J. [1] ; Winand, Nena J. [1] ; Borges, Alexandre S. [1]
Total Authors: 8
Affiliation:
[1] UNESP Univ Estadual Paulista, Sch Vet Med & Anim Sci, Dept Vet Clin Sci, BR-18618000 Botucatu, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Innate Immunity; v. 18, n. 3, p. 438-446, JUN 2012.
Web of Science Citations: 10
Abstract

Hepcidin has been found to be the key regulator of iron metabolism that leads to hypoferremia during inflammation. Recent work has shown that equine hepcidin is predominantly expressed in the liver of horses. In this study, hepcidin gene expression was determined in the liver and bone marrow of six healthy horses after iv infusion of Escherichia coli O55:B5 LPS. The IL-6 gene expression was also determined in liver and bone marrow samples. Clinical and laboratory evaluations were measured at multiple time points between 0 and 240 h post-LPS infusion (PI). Liver and bone marrow biopsies were taken immediately before (baseline) and at 6 and 18 h PI. In response to endotoxin infusion, all horses showed characteristic clinical signs of endotoxemia. Plasma iron concentration was decreased significantly from the pre-infusion level at 8 h PI. Hypoferremia peak was observed at 12 h and returned to normal levels at 30 h PI. Relative real-time RT-PCR analysis showed that liver hepcidin and IL-6 mRNA expression was up-regulated at 6 h PI. Bone marrow hepcidin relative expression was not influenced by LPS infusion. In another experiment, equine monocyte cultures were stimulated with LPS (1 mu g/ml). Monocyte hepcidin and IL-6 gene expression was significantly induced after 2 h of LPS stimulus and returned to baseline levels thereafter. The present study describes that, in horses, LPS infusion up-regulates hepatic hepcidin mRNA expression resulting in early observed hypoferremia and suggests that hepcidin may act as an acute-phase protein in horses. (AU)

FAPESP's process: 07/07344-6 - Effects of equine inflammation on hepcidin expression and plasma iron concentration
Grantee:Alexandre Secorun Borges
Support Opportunities: Regular Research Grants
FAPESP's process: 07/05008-9 - Effects of equine inflammation on hepcidin expression and plasma iron concentration
Grantee:José Paes de Oliveira Filho
Support Opportunities: Scholarships in Brazil - Doctorate