Abstract:
:The immunomodulatory functions of prolactin (PRL) are well recognized. Augmented PRL plasma levels were observed in patients with advanced tuberculosis (TB). Recently, we have reported that LPS and Mycobacterium bovis (M. bovis) induced differential expression of PRL receptor (PRLR) isoforms in THP-1 cells and bovine macrophages, respectively. The aim of this work was to determine whether PRL should be considered as a potential modulator of the signaling pathways and cytokine synthesis, induced by culture filtrate protein (CFP) from M. bovis in THP-1 monocytes. The THP-1 cells were stimulated with PRL (20ng/mL), M. bovis CFP (50μg/mL). PRLR as well as phosphorylated STAT3, STAT5, Akt1/2/3, ERK1/2 and p38 expression were evaluated by Western blot. IL1-β, TNF-α, IL-6, IL-12, IL-8, and IL-10 concentrations were measured by ELISA. Our results demonstrated that the expression pattern of PRLR short isoforms is induced by M. bovis CFP. M bovis CFP induced phosphorylation of Akt2, ERK1/2, p38, STAT3, and STAT5 pathways. In turn, PRL only activated the JAK2/STAT3-5 signaling pathway. However, when combined both stimuli, PRL significantly increased STAT3-5 phosphorylation and downregulated Akt2, ERK1/2, and p38 phosphorylation. As expected, M. bovis CFP induced substantial amounts of IL1-β, IL-6, TNF-α, IL-8, IL-12, and IL-10. However, the PRL costimulation considerably decreased IL1-β, TNF-α, and IL-12 secretion, and increased IL-10 production. This results suggest that up-regulation of IL-10 by PRL might be modulating the pro-inflammatory response against mycobacterial antigens through the MAPK pathway.
journal_name
Cytokinejournal_title
Cytokineauthors
Martínez-Neri PA,López-Rincón G,Mancilla-Jiménez R,del Toro-Arreola S,Muñoz-Valle JF,Fafutis-Morris M,Bueno-Topete MR,Estrada-Chávez C,Pereira-Suárez ALdoi
10.1016/j.cyto.2014.08.006subject
Has Abstractpub_date
2015-01-01 00:00:00pages
38-44issue
1eissn
1043-4666issn
1096-0023pii
S1043-4666(14)00524-9journal_volume
71pub_type
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