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Neurotrophins play a protective role during cerebral ischemia, and mice lacking both alleles for neurotrophin 4 (Nt4-/- ) or deficient in a single allele for brain-derived neurotrophic factor (Bdnf+/-) have increased susceptibility to cerebral ischemia. This study directly compared the biologic activities of brain-derived neurotrophic factor (BDNF) and NT4 by replacing the coding sequence with the Nt4 sequence (Bdnf +/nt4-ki ). Mice expressing one allele in place of develop 61% bigger lesions after 1-hour middle cerebral artery occlusion compared with wild-type littermates. Physiologic parameters did not contribute to ischemia susceptibility. In conclusion, NT4 is less potent than BDNF in promoting brain survival after stroke.

Stroke Damage in Mice after Knocking the Neutrophin-4 Gene into the Brain-Derived Neurotrophic Factor Locus