Mice deficient in the cytokines tumor necrosis factor (TNF) or lymphotoxin (LT) α/β lack polarized B cell follicles in the spleen. Deficiency in CXC chemokine receptor 5 (CXCR5), a receptor for B lymphocyte chemoattractant (BLC), also causes loss of splenic follicles. Here we report that BLC expression by follicular stromal cells is defective in TNF-, TNF receptor 1 (TNFR1)-, LTα- and LTβ-deficient mice. Treatment of adult mice with antagonists of LTα1β2 also leads to decreased BLC expression. These findings indicate that LTα1β2 and TNF have a role upstream of BLC/CXCR5 in the process of follicle formation. In addition to disrupted follicles, LT-deficient animals have disorganized T zones. Expression of the T cell attractant, secondary lymphoid tissue chemokine (SLC), by T zone stromal cells is found to be markedly depressed in LTα-, and LTβ-deficient mice. Expression of the SLC-related chemokine, Epstein Barr virus–induced molecule 1 ligand chemokine (ELC), is also reduced. Exploring the basis for the reduced SLC expression led to identification of further disruptions in T zone stromal cells. Together these findings indicate that LTα1β2 and TNF are required for the development and function of B and T zone stromal cells that make chemokines necessary for lymphocyte compartmentalization in the spleen.
Lymphotoxin α/β and Tumor Necrosis Factor Are Required for Stromal Cell Expression of Homing Chemokines in B and T Cell Areas of the Spleen
Address correspondence to Jason G. Cyster, Department of Microbiology and Immunology, University of California San Francisco, 513 Parnassus St., San Francisco, CA 94143-0414. Phone: 415-502-6427; Fax: 415-502-8424; E-mail: [email protected]
J.D. Sedgwick, H. Korner, and D.S. Riminton were supported by grants from the National Health and Medical Research Council of Australia and the National Multiple Sclerosis Society of Australia. J.G. Cyster is a Pew Scholar in the biomedical sciences. This work was supported in part by National Institutes of Health grant AI40098 to J.G. Cyster and by Howard Hughes Medical Institute grant 76296-549901 to the University of California San Francisco School of Medicine.
J.D. Sedgwick's present address is DNAX Research Institute, 901 California Ave., Palo Alto, CA 94304-1104.
Vu N. Ngo, Heinrich Korner, Michael D. Gunn, Kerstin N. Schmidt, D. Sean Riminton, Max D. Cooper, Jeffrey L. Browning, Jonathon D. Sedgwick, Jason G. Cyster; Lymphotoxin α/β and Tumor Necrosis Factor Are Required for Stromal Cell Expression of Homing Chemokines in B and T Cell Areas of the Spleen . J Exp Med 18 January 1999; 189 (2): 403–412. doi: https://doi.org/10.1084/jem.189.2.403
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