O'Connor, T., Zhou, X., Kosla, J., Adili, A., Garcia Beccaria, M., Kotsiliti, E., Pfister, D., Johlke, A. L., Sinha, A., Sankowski, R., Schick, M., Lewis, R., Dokalis, N., Seubert, B., Hochst, B., Inverso, D., Heide, D., Zhang, W., Weihrich, P., Manske, K., Wohlleber, D., Anton, M., Hoellein, A., Seleznik, G., Bremer, J., Bleul, S., Augustin, H. G., Scherer, F., Koedel, U., Weber, A., Protzer, U., Forster, R., Wirth, T., Aguzzi, A., Meissner, F., Prinz, M., Baumann, B., Hopken, U. E., Knolle, P. A., von Baumgarten, L., Keller, U., Heikenwalder, M. (2019). Cancer Cell 36, 250-267 e9.
How lymphoma cells (LCs) invade the brain during the development of central nervous system lymphoma (CNSL) is unclear. We found that NF-κB-induced gliosis promotes CNSL in immunocompetent mice. Gliosis elevated cell-adhesion molecules, which increased LCs in the brain but was insufficient to induce CNSL. Astrocyte-derived CCL19 was required for gliosis-induced CNSL. Deleting CCL19 in mice or CCR7 from LCs abrogated CNSL development. Two-photon microscopy revealed LCs transiently entering normal brain parenchyma. Astrocytic CCL19 enhanced parenchymal CNS retention of LCs, thereby promoting CNSL formation. Aged, gliotic wild-type mice were more susceptible to forming CNSL than young wild-type mice, and astrocytic CCL19 was observed in both human gliosis and CNSL. Therefore, CCL19-CCR7 interactions may underlie an increased age-related risk for CNSL.