TLR 9 involvement in early protection induced by immunization with rPb27 against Paracoccidioidomycosis

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• 作者：Elis Araujo Morais^a ; Daniela Ferreira Chame^a ; Eliza Mathias Melo^a ; Junnia Alvarenga de Carvalho Oliveira^a ; Ana Clá ; udia Chagas de Paula^a ; Andiara Cardoso Peixoto^b ; Lí ; lian da Silva Santos^c ; Dawidson Assis Gomes^c ; Remo Castro Russo^b ; Alfredo Miranda de Goes^a ; ^{alfredomgoes@gmail.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：RPB27 ; Paracoccidioides brasiliensis ; Paracoccidioidomycosis ; TLR9 ; CPG ; Adjuvant
• 刊名：Microbes and Infection
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：18
• 期：2
• 页码：137-147
• 全文大小：4411 K

文摘

Paracoccidioidomycosis is caused by fungi of the Paracoccidioides genus and constitutes the most prevalent deep mycosis in Latin America. Toll-like receptors promote immune response against infectious agents. Recently, it was reported that TLR9 is crucial for mice survival during the first 48 h of P. brasiliensis infection. In this study, we used CPG oligodeoxynucleotide motif as an adjuvant with and without rPb27 to immunize mice against Paracoccidioidomycosis. CPG adjuvant induced differential recruitment of lymphocytes in the inflammatory process and a lower recruitment of neutrophils. In addition, CPG induced the production of pro-inflammatory cytokines such as IL-1β, TNF-α, IL-6 and IL-12; increased phagocytic ability and microbicidal activity by macrophages; and induced differential production of lgG2a and lgG2b, subtypes of Ig. Knockout mice for TLR9 and IL-12 showed higher fungal loads and rates of mortality compared to control mice after 30 days of infection. The association between CPG and rPb27 induced a high level of protection against Paracoccidioidomycosis after the first 30 days of infection but not at 60 days. Our findings demonstrate that TLR 9 plays a role in the protection induced by immunization with rPb27 and confirms the importance of TLR9 in the initial protection against Paracoccidioidomycosis.