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Articles by R Forster
Total Records ( 2 ) for R Forster
  T Quast , B Tappertzhofen , C Schild , J Grell , N Czeloth , R Forster , R Alon , L Fraemohs , K Dreck , C Weber , T Lammermann , M Sixt and W. Kolanus
 

Adhesion and motility of mammalian leukocytes are essential requirements for innate and adaptive immune defense mechanisms. We show here that the guanine nucleotide exchange factor cytohesin-1, which had previously been demonstrated to be an important component of beta-2 integrin activation in lymphocytes, regulates the activation of the small GTPase RhoA in primary dendritic cells (DCs). Cytohesin-1 and RhoA are both required for the induction of chemokine-dependent conformational changes of the integrin beta-2 subunit of DCs during adhesion under physiological flow conditions. Furthermore, use of RNAi in murine bone marrow DCs (BM-DCs) revealed that interference with cytohesin-1 signaling impairs migration of wild-type dendritic cells in complex 3D environments and in vivo. This phenotype was not observed in the complete absence of integrins. We thus demonstrate an essential role of cytohesin-1/RhoA during ameboid migration in the presence of integrins and further suggest that DCs without integrins switch to a different migration mode.

  M Luchtefeld , C Grothusen , A Gagalick , K Jagavelu , H Schuett , U. J. F Tietge , O Pabst , K Grote , H Drexler , R Forster and B. Schieffer
  Background—

Atherosclerosis is a systemic inflammatory disease characterized by the formation of atherosclerotic plaques. Both innate immunity and adaptive immunity contribute to atherogenesis, but the mode of interaction is poorly understood. Chemokine receptor 7 (CCR7) is critically involved in the transition from innate to adaptive immune activation by coordinating the migration to and positioning of antigen-presenting dendritic cells and T cells in secondary lymphoid organs. More recently, it was shown that CCR7 is also responsible for T-cell migration into inflamed tissues and T-cell egress from these tissues via the afferent lymph. Thus, we investigated the influence of a systemic CCR7 deficiency on atherogenesis in atherosclerosis-prone low-density lipoprotein receptor (ldlr) knockout mice.

Methods and Results—

CCR7 deficiency resulted in reduced atherosclerotic plaque development. CCR7–/– T cells showed impaired entry and exit behavior from atherosclerotic lesions. Oxidized low-density lipoprotein, a key molecule for atherogenesis with antigenic features, was used to pulse dendritic cells and to expand T cells ex vivo. Adoptive transfer of C57BL/6 wild-type T cells but not ccr7–/–-derived T cells primed with oxidized low-density lipoprotein–pulsed dendritic cells resulted in a reconstitution of atherogenesis in ccr7–/–/ldlr–/– mice.

Conclusion—

These results demonstrate that both CCR7-dependent T-cell priming in secondary lymphoid organs and CCR7-dependent recirculation of T cells between secondary lymphoid organs and inflamed tissue are crucially involved in atherosclerotic plaque development.

 
 
 
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