Differential interaction of dendritic cells with Rickettsia conorii

Impact on host susceptibility to murine spotted fever rickettsiosis

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36 Citations (Scopus)

Abstract

Spotted fever group rickettsioses are emerging and reemerging infectious diseases, some of which are life-threatening. In order to understand how dendritic cells (DCs) contribute to the host resistance or susceptibility to rickettsial diseases, we first characterized the in vitro interaction of rickettsiae with bone marrow-derived DCs (BMDCs) from resistant C57BL/6 (B6) and susceptible C3H/HeN (C3H) mice. In contrast to the exclusively cytosolic localization within endothelial cells, rickettsiae efficiently entered and localized in both phagosomes and cytosol of BMDCs from both mouse strains. Rickettsia conorii-infected BMDCs from resistant mice harbored higher bacterial loads compared to C3H mice. R. conorii infection induced maturation of BMDCs from both mouse strains as judged by upregulated expression of classical major histocompatibility complex (MHC) and costimulatory molecules. Compared to C3H counterparts, B6 BMDCs exhibited higher expression levels of MHC class II and higher interleukin-12 (IL-12) p40 production upon rickettsial infection and were more potent in priming naïve CD4+ T cells to produce gamma interferon. In vitro DC infection and T-cell priming studies suggested a delayed CD4+ T-cell activation and suppressed Th1/Th2 cell development in C3H mice. The suppressive CD4+ T-cell responses seen in C3H mice were associated with a high frequency of Foxp3+ T regulatory cells promoted by syngeneic R. conorii-infected BMDCs in the presence of IL-2. These data suggest that rickettsiae can target DCs to stimulate a protective type 1 response in resistant hosts but suppressive adaptive immunity in susceptible hosts.

Original languageEnglish (US)
Pages (from-to)3112-3123
Number of pages12
JournalInfection and Immunity
Volume75
Issue number6
DOIs
StatePublished - Jun 2007

Fingerprint

Rickettsia conorii
Dendritic Cells
Fever
Inbred C3H Mouse
Bone Marrow
Rickettsia
Emerging Communicable Diseases
T-Lymphocytes
Major Histocompatibility Complex
Rickettsia Infections
Phagosomes
Th2 Cells
Th1 Cells
Bacterial Load
Adaptive Immunity
Regulatory T-Lymphocytes
Interleukin-12
Infection
Cytosol
Interferon-gamma

ASJC Scopus subject areas

  • Immunology

Cite this

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title = "Differential interaction of dendritic cells with Rickettsia conorii: Impact on host susceptibility to murine spotted fever rickettsiosis",
abstract = "Spotted fever group rickettsioses are emerging and reemerging infectious diseases, some of which are life-threatening. In order to understand how dendritic cells (DCs) contribute to the host resistance or susceptibility to rickettsial diseases, we first characterized the in vitro interaction of rickettsiae with bone marrow-derived DCs (BMDCs) from resistant C57BL/6 (B6) and susceptible C3H/HeN (C3H) mice. In contrast to the exclusively cytosolic localization within endothelial cells, rickettsiae efficiently entered and localized in both phagosomes and cytosol of BMDCs from both mouse strains. Rickettsia conorii-infected BMDCs from resistant mice harbored higher bacterial loads compared to C3H mice. R. conorii infection induced maturation of BMDCs from both mouse strains as judged by upregulated expression of classical major histocompatibility complex (MHC) and costimulatory molecules. Compared to C3H counterparts, B6 BMDCs exhibited higher expression levels of MHC class II and higher interleukin-12 (IL-12) p40 production upon rickettsial infection and were more potent in priming na{\"i}ve CD4+ T cells to produce gamma interferon. In vitro DC infection and T-cell priming studies suggested a delayed CD4+ T-cell activation and suppressed Th1/Th2 cell development in C3H mice. The suppressive CD4+ T-cell responses seen in C3H mice were associated with a high frequency of Foxp3+ T regulatory cells promoted by syngeneic R. conorii-infected BMDCs in the presence of IL-2. These data suggest that rickettsiae can target DCs to stimulate a protective type 1 response in resistant hosts but suppressive adaptive immunity in susceptible hosts.",
author = "Rong Fang and Nahed Ismail and Lynn Soong and Vsevolod Popov and Ted Whitworth and Donald Bouyer and David Walker",
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T2 - Impact on host susceptibility to murine spotted fever rickettsiosis

AU - Fang, Rong

AU - Ismail, Nahed

AU - Soong, Lynn

AU - Popov, Vsevolod

AU - Whitworth, Ted

AU - Bouyer, Donald

AU - Walker, David

PY - 2007/6

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N2 - Spotted fever group rickettsioses are emerging and reemerging infectious diseases, some of which are life-threatening. In order to understand how dendritic cells (DCs) contribute to the host resistance or susceptibility to rickettsial diseases, we first characterized the in vitro interaction of rickettsiae with bone marrow-derived DCs (BMDCs) from resistant C57BL/6 (B6) and susceptible C3H/HeN (C3H) mice. In contrast to the exclusively cytosolic localization within endothelial cells, rickettsiae efficiently entered and localized in both phagosomes and cytosol of BMDCs from both mouse strains. Rickettsia conorii-infected BMDCs from resistant mice harbored higher bacterial loads compared to C3H mice. R. conorii infection induced maturation of BMDCs from both mouse strains as judged by upregulated expression of classical major histocompatibility complex (MHC) and costimulatory molecules. Compared to C3H counterparts, B6 BMDCs exhibited higher expression levels of MHC class II and higher interleukin-12 (IL-12) p40 production upon rickettsial infection and were more potent in priming naïve CD4+ T cells to produce gamma interferon. In vitro DC infection and T-cell priming studies suggested a delayed CD4+ T-cell activation and suppressed Th1/Th2 cell development in C3H mice. The suppressive CD4+ T-cell responses seen in C3H mice were associated with a high frequency of Foxp3+ T regulatory cells promoted by syngeneic R. conorii-infected BMDCs in the presence of IL-2. These data suggest that rickettsiae can target DCs to stimulate a protective type 1 response in resistant hosts but suppressive adaptive immunity in susceptible hosts.

AB - Spotted fever group rickettsioses are emerging and reemerging infectious diseases, some of which are life-threatening. In order to understand how dendritic cells (DCs) contribute to the host resistance or susceptibility to rickettsial diseases, we first characterized the in vitro interaction of rickettsiae with bone marrow-derived DCs (BMDCs) from resistant C57BL/6 (B6) and susceptible C3H/HeN (C3H) mice. In contrast to the exclusively cytosolic localization within endothelial cells, rickettsiae efficiently entered and localized in both phagosomes and cytosol of BMDCs from both mouse strains. Rickettsia conorii-infected BMDCs from resistant mice harbored higher bacterial loads compared to C3H mice. R. conorii infection induced maturation of BMDCs from both mouse strains as judged by upregulated expression of classical major histocompatibility complex (MHC) and costimulatory molecules. Compared to C3H counterparts, B6 BMDCs exhibited higher expression levels of MHC class II and higher interleukin-12 (IL-12) p40 production upon rickettsial infection and were more potent in priming naïve CD4+ T cells to produce gamma interferon. In vitro DC infection and T-cell priming studies suggested a delayed CD4+ T-cell activation and suppressed Th1/Th2 cell development in C3H mice. The suppressive CD4+ T-cell responses seen in C3H mice were associated with a high frequency of Foxp3+ T regulatory cells promoted by syngeneic R. conorii-infected BMDCs in the presence of IL-2. These data suggest that rickettsiae can target DCs to stimulate a protective type 1 response in resistant hosts but suppressive adaptive immunity in susceptible hosts.

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