Mycobacterium avium subsp. paratuberculosis down-regulates mRNA expression of iron-induced macrophage Ferroportin 1

Bertha Landeros-Sánchez; José Ángel Gutiérrez-Pabello; Gerardo Enrique Medina-Basulto; Tomas Benjamin Renteria-Evangelista; Efrén Díaz-Aparicio; Sawako Oshima

2016, Number 1

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Vet Mex 2016; 3 (1)

Mycobacterium avium subsp. paratuberculosis down-regulates mRNA expression of iron-induced macrophage Ferroportin 1

Landeros-Sánchez B, Gutierrez-Pabello JA, Medina-Basulto GE, Renteria-Evangelista TB, Díaz-Aparicio E, Oshima S

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ABSTRACT

Mycobacterium avium subsp. paratuberculosis (MAP) is the causative agent of Johne’s disease. The mechanisms by which MAP is able to adapt to the innate host response are still unclear. We examined Ferroportin 1 (FPN1) mRNA expression levels via real-time PCR of the mouse macrophage cell line J774 that was incubated in the presence of Mycobacterium avium subsp. paratuberculosis (MAP) or MAP crude protein extract. Infection with live MAP decreased FPN1 mRNA levels in a multiplicity of infection (MOI)-dependent fashion. Macrophages infected with MOIs of 20:1 and 15:1 did not show any change in FPN1 gene expression, whereas MOIs of 10:1 and 5:1 induced a decrease of 50 and 80%, respectively. Macrophages treated with 50, 100, 150 and 200 µg/mL of MAP crude extract (ATCC19698) decreased FPN1 mRNA expression by 25%. Additionally, up-regulation of FPN1 mRNA by an iron overload treatment of 400 µM of ferric nitrilotriacetate (FeNTA) was abrogated by live MAP (MOI 20:1) by approximately 70%. Our data revealed an inhibitory effect of MAP on FPN1 mRNA and suggested a bacterial mechanism that may play a role in host iron regulation.

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