{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,9,12]],"date-time":"2025-09-12T18:55:07Z","timestamp":1757703307408},"reference-count":48,"publisher":"Journal of Neurosurgery Publishing Group (JNSPG)","issue":"2","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[1992,8]]},"abstract":"<jats:p content-type=\"fine-print\">\u2713 Morphological and ultrastructural changes in normal mouse brain tissue were investigated after intracerebral stereotactic injections of tumor necrosis factor (specific activity: 2.0 \u00d7 10<jats:sup>6<\/jats:sup>U\/mg protein) into the right frontal lobe. The mice received either a single infusion or multiple tumor necrosis factor infusions in three different dose groups (10, 100, or 500 U). Compared with sham-treated control mice that received adjusted intracerebral injections of purified albumin, the tumor necrosis factor-treated mice in all dose groups did not show any specific<jats:italic>in vivo<\/jats:italic>behavioral abnormalities during the 2 months of study following the infusions.<\/jats:p><jats:p content-type=\"fine-print\">Histological studies revealed hemorrhage attributable to the mechanics of the intracerebral infusions, a thickening of the arachnoid membranes, a reactive gliosis, and neutrophilic and\/or mononuclear cell infiltration along the infusion pathway. A local neutrophilic response was prominent 1 day after tumor necrosis factor injection. An immunohistochemical analysis indicated that the mononuclear cell infiltration consisted of lymphocytes and macrophages. Except for the transient neutrophilic infiltration, these histological alterations did not differ from those seen in the sham-treated control groups, and most nonspecific reactive changes disappeared within 8 weeks after the injections. Furthermore, an ultrastructural study showed no apparent pathological changes in the cytoplasmic organelles of neuronal, glial, and endothelial cells in the tumor necrosis factor-injected mouse specimens. These results suggest that the tumor necrosis factor injections caused no specific toxicity and did not alter the parenchymal and stromal cells comprising normal mouse brain tissue.<\/jats:p>","DOI":"10.3171\/jns.1992.77.2.0279","type":"journal-article","created":{"date-parts":[[2009,5,26]],"date-time":"2009-05-26T19:06:55Z","timestamp":1243364815000},"page":"279-287","source":"Crossref","is-referenced-by-count":11,"title":["A morphological and ultrastructural investigation of normal mouse brain tissue after intracerebral injection of tumor necrosis 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