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J. Exp. Med., Volume 189, Number 2, January 18, 1999 403-412

Lymphotoxin alpha /beta and Tumor Necrosis Factor Are Required for Stromal Cell Expression of Homing Chemokines in B and T Cell Areas of the Spleen

By Vu N. Ngo,* Heinrich Korner,§ Michael D. Gunn,Dagger Kerstin N. Schmidt,* D. Sean Riminton,§ Max D. Cooper,parallel Jeffrey L. Browning, Jonathon D. Sedgwick,Dagger § and Jason G. Cyster*

From the * Department of Microbiology and Immunology, and Dagger  Cardiovascular Research Institute, University of California San Francisco, San Francisco, California 94143; § Centenary Institute of Cancer Medicine and Cell Biology, Sydney, 2050 New South Wales, Australia; parallel  Howard Hughes Medical Institute, University of Alabama at Birmingham, Birmingham, Alabama 35294; and  Biogen Inc., Cambridge, Massachusetts 02142

Mice deficient in the cytokines tumor necrosis factor (TNF) or lymphotoxin (LT) alpha /beta 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)-, LTalpha - and LTbeta -deficient mice. Treatment of adult mice with antagonists of LTalpha 1beta 2 also leads to decreased BLC expression. These findings indicate that LTalpha 1beta 2 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 LTalpha -, and LTbeta -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 LTalpha 1beta 2 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.

Key words: lymphoid tissue;  follicle;  lymphocyte;  follicular dendritic cell;  dendritic cell


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