Brain-derived neurotrophic factor (BDNF) has potent effects on neuronal survival and plasticity during development and after injury. In the nervous system, neurons are considered the major cellular source of BDNF. We demonstrate here that in addition, activated human T cells, B cells, and monocytes secrete bioactive BDNF in vitro. Notably, in T helper (Th)1- and Th2-type CD4+ T cell lines specific for myelin autoantigens such as myelin basic protein or myelin oligodendrocyte glycoprotein, BDNF production is increased upon antigen stimulation. The BDNF secreted by immune cells is bioactive, as it supports neuronal survival in vitro. Using anti-BDNF monoclonal antibody and polyclonal antiserum, BDNF immunoreactivity is demonstrable in inflammatory infiltrates in the brain of patients with acute disseminated encephalitis and multiple sclerosis. The results raise the possibility that in the nervous system, inflammatory infiltrates have a neuroprotective effect, which may limit the success of nonselective immunotherapies.
Activated Human T Cells, B Cells, and Monocytes Produce Brain-derived Neurotrophic Factor In Vitro and in Inflammatory Brain Lesions: A Neuroprotective Role of Inflammation?
Address correspondence to Reinhard Hohlfeld, Department of Neuroimmunology, Max Planck Institute for Neurobiology, Am Klopferspitz 18A, D-82152 Martinsried, Germany. Phone: 49-89-7095-4780; Fax: 49-89-7095-4782; E-mail: [email protected]
The Institute for Clinical Neuroimmunology is supported by the Hermann und Lilly Schilling-Foundation and Max Planck-Society. This project was further supported by the Deutsche Forschungsgemeinschaft (SFB 217, C13), Hertie-Stiftung (GHS 339/95), and European Community (BMH4-CT96-0893: Immunoregulatory aspects of T cell autoimmunity in multiple sclerosis). R.L. Oropeza-Wekerle was supported by GSF FE-72121 and the Klinik and Poliklinik für Dermatologie and Allergologie, Technical University of Munich. This study is part of the M.D. theses of M. Kerschensteiner and E. Gallmeier.
Martin Kerschensteiner, Eike Gallmeier, Lüder Behrens, Vivian Vargas Leal, Thomas Misgeld, Wolfgang E.F. Klinkert, Roland Kolbeck, Edmund Hoppe, Rosa-Laura Oropeza-Wekerle, Ilse Bartke, Christine Stadelmann, Hans Lassmann, Hartmut Wekerle, Reinhard Hohlfeld; Activated Human T Cells, B Cells, and Monocytes Produce Brain-derived Neurotrophic Factor In Vitro and in Inflammatory Brain Lesions: A Neuroprotective Role of Inflammation? . J Exp Med 1 March 1999; 189 (5): 865–870. doi: https://doi.org/10.1084/jem.189.5.865
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