cells Article Tumor Necrosis Factor (TNF) Is Required for Spatial Learning and Memory in Male Mice under Physiological, but Not Immune-Challenged Conditions Leda Mygind 1,2, Marianne Skov-Skov Bergh 3, Vivien Tejsi 1,2, Ramanan Vaitheeswaran 1,2, Kate L. Lambertsen 1,2,4 , Bente Finsen 1,2,*,† and Athanasios Metaxas 1,2,5,*,† 1 Institute of Molecular Medicine, Department of Neurobiology, University of Southern Denmark, J.B. Winsløws Vej 25, DK-5000 Odense C, Denmark;
[email protected] (L.M.);
[email protected] (V.T.);
[email protected] (R.V.);
[email protected] (K.L.L.) 2 BRIDGE—Brain Research Inter-Disciplinary Guided Excellence, Department of Clinical Research, University of Southern Denmark, J.B. Winsløws Vej 19, DK-5000 Odense C, Denmark 3 Department of Forensic Sciences, Division of Laboratory Medicine, Oslo University Hospital, Loviseberggata, 60456 Oslo, Norway;
[email protected] 4 Department of Neurology, Odense University Hospital, J.B. Winsløws Vej 4, DK-5000 Odense C, Denmark 5 School of Science, Department of Life Sciences, European University Cyprus, 6 Diogenis Str., Nicosia 1516, Cyprus * Correspondence: bfi
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[email protected] (A.M.) † These authors contributed equally to work. Abstract: Increasing evidence demonstrates that inflammatory cytokines—such as tumor necrosis Citation: Mygind, L.; Bergh, M.S.-S.; factor (TNF)—are produced at low levels in the brain under physiological conditions and may be Tejsi, V.; Vaitheeswaran, R.; crucial for synaptic plasticity, neurogenesis, learning and memory. Here, we examined the effects of Lambertsen, K.L.; Finsen, B.; Metaxas, developmental TNF deletion on spatial learning and memory using 11–13-month-old TNF knockout A.