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Brucella abortus Proliferates in Decidualized and Non-Decidualized Human Endometrial Cells Inducing a Proinflammatory Response
Open AccessArticle

Hepatic Stellate Cells and Hepatocytes as Liver Antigen-Presenting Cells during B. abortus Infection

1
Instituto de Inmunología, Genética y Metabolismo (INIGEM), Universidad de Buenos Aires, CONICET, Buenos Aires 1120, Argentina
2
Instituto de Investigaciones Biomédicas en Retrovirus y Sida (INBIRS), Universidad de Buenos Aires, CONICET, Buenos Aires 1121, Argentina
*
Authors to whom correspondence should be addressed.
Pathogens 2020, 9(7), 527; https://doi.org/10.3390/pathogens9070527
Received: 27 May 2020 / Revised: 6 June 2020 / Accepted: 15 June 2020 / Published: 30 June 2020
(This article belongs to the Special Issue Host Immune Responses and Pathogenesis to Brucella spp. Infection)
In Brucellosis, the role of hepatic stellate cells (HSCs) in the induction of liver fibrosis has been elucidated recently. Here, we study how the infection modulates the antigen-presenting capacity of LX-2 cells. Brucella abortus infection induces the upregulation of class II transactivator protein (CIITA) with concomitant MHC-I and -II expression in LX-2 cells in a manner that is independent from the expression of the type 4 secretion system (T4SS). In concordance, B. abortus infection increases the phagocytic ability of LX-2 cells and induces MHC-II-restricted antigen processing and presentation. In view of the ability of B. abortus-infected LX-2 cells to produce monocyte-attracting factors, we tested the capacity of culture supernatants from B. abortus-infected monocytes on MHC-I and –II expression in LX-2 cells. Culture supernatants from B. abortus-infected monocytes do not induce MHC-I and -II expression. However, these supernatants inhibit MHC-II expression induced by IFN-γ in an IL-10 dependent mechanism. Since hepatocytes constitute the most abundant epithelial cell in the liver, experiments were conducted to determine the contribution of these cells in antigen presentation in the context of B. abortus infection. Our results indicated that B. abortus-infected hepatocytes have an increased MHC-I expression, but MHC-II levels remain at basal levels. Overall, B. abortus infection induces MHC-I and -II expression in LX-2 cells, increasing the antigen presentation. Nevertheless, this response could be modulated by resident or infiltrating monocytes/macrophages. View Full-Text
Keywords: Brucella; HSC; MHC; IL-10 Brucella; HSC; MHC; IL-10
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Arriola Benitez, P.C.; Pesce Viglietti, A.I.; Elizalde, M.M.; Giambartolomei, G.H.; Quarleri, J.F.; Delpino, M.V. Hepatic Stellate Cells and Hepatocytes as Liver Antigen-Presenting Cells during B. abortus Infection. Pathogens 2020, 9, 527.

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