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Microsphere embolism‐induced elevation of nerve growth factor level and appearance of nerve growth factor immunoreactivity in activated T‐lymphocytes in the rat brain
Author(s) -
Mizuma Hideyuki,
Takagi Kaori,
Miyake Keiko,
Takagi Norio,
Ishida Kumi,
Takeo Satoshi,
Nitta Atsumi,
Nomoto Hiroshi,
Furukawa Yoshiko,
Furukawa Shoei
Publication year - 1999
Publication title -
journal of neuroscience research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.72
H-Index - 160
eISSN - 1097-4547
pISSN - 0360-4012
DOI - 10.1002/(sici)1097-4547(19990315)55:6<749::aid-jnr9>3.0.co;2-n
Subject(s) - nerve growth factor , medicine , cerebral cortex , endocrinology , hippocampus , hippocampal formation , biology , neuroscience , chemistry , receptor
Changes in nerve growth factor (NGF) level and type of cells producing NGF were investigated in the rat brain after sustained cerebral embolism. The NGF level was determined by a two‐site enzyme immunoassay specific for NGF. The cerebral cortex, striatum, and hippocampus of the embolized hemisphere maximally contained 2.4‐, 2.4‐, and 1.7‐times higher NGF levels than the corresponding regions of the non‐embolized hemisphere. A significant increase was transiently observed for 1 week in the cerebral cortex and striatum, whereas the increase was longer lasting, at least of 4 weeks' duration, in the hippocampus. To examine the localization of NGF‐like immunoreactivity (NGF‐LI), we used a newly developed anti‐NGF peptide antiserum that specifically recognized a 30‐kDa molecule(s) in the hippocampal extracts or in NGF cDNA‐transfected cells, suggesting that the antibody predominantly reacted with the putative NGF precursor protein(s). NGF‐LI, which was localized in neurons of the normal or non‐embolized hemisphere, was reduced, and on the embolized side new signals emerged in small non‐neuronal cells having a round shape. These included cells with common leukocyte antigen CD45 and T‐lymphocyte antigen CD3, which did not appear in the normal or non‐embolized hemisphere. NGF‐LI and CD3 were colocalized in a substantial number of the cells, suggesting that some activated T‐lymphocytes produce NGF for neuronal regeneration after sustained cerebral embolism. J. Neurosci. Res. 56:749–761, 1999. © 1999 Wiley‐Liss, Inc.