title: Cutting edge: nonproliferating mature immune cells form a novel type of organized lymphoid structure in idiopathic pulmonary fibrosis.
abstract: Ectopic formation of secondary lymphoid tissue is initiated by the local attraction of naive T and B cells. In this study, we describe a novel type of organized lymphoid structure in the lung of human idiopathic pulmonary fibrosis, with key features of lymphoid neogenesis, including: 1) recently activated CD40 ligand (CD40L)+ T cells; 2) variable numbers of activated CD40+/CD40L+ B cells, sometimes organized in follicles; 3) fully mature dendritic cells (DC) expressing CD40, CD83, CD86, and DC-lysosome-associated membrane protein; 4) the expression of the chemokine CCL21; 5) the presence of vessels with characteristics of high endothelial venules; and 6) a dense network of follicular DC. Surprisingly, these structures are devoid of CCR7+ naive T cells, proliferating lymphocytes, and germinal centers, suggesting that newly recruited activated DC and Ag-experienced lymphocytes can drive lymphoid neogenesis and that factors present within the lymphoid aggregates, such as CD40L, are essential to induce DC maturation.
authors: Institut National de la Santé et de la Recherche Médicale Unité 700, Université Paris 7, Faculté de Médecine Xavier Bichat, 75870 Paris Cedex 18, France.
authors: Joëlle
authors: J
authors: Marchal-Sommé
authors: Yurdagul
authors: Y
authors: Uzunhan
authors: Sylvain
authors: S
authors: Marchand-Adam
authors: Dominique
authors: D
authors: Valeyre
authors: Vassili
authors: V
authors: Soumelis
authors: Bruno
authors: B
authors: Crestani
authors: Paul
authors: P
authors: Soler