Résumé
<p><b>OBJECTIVE</b>Nogo-A is an axon regeneration inhibitor, and its function in central nervous system (CNS) is still unknown. The present study is to explore the relationship between the expression of Nogo-A and the malignancy of oligodendroglial tumors in patients.</p><p><b>METHODS</b>Tumor tissue samples with different malignancy grade were obtained from the hospitals. The samples used for detection had been diagnosed as oligodendroglial tumors (oligodendroglioma or anaplastic oligodendroglioma). The expression of Nogo-A was detected by immunohistochemistry and western-blot analysis. The correlation test between the Nogo-A expression and the morphological changes (the percentages of atypical cells and mitotic cells in the tumors) related to the malignancy of tumor tissues was performed.</p><p><b>RESULTS</b>There was significant negative correlation between the Nogo-A expression and the morphological change of tumor tissues according to immunohistochemistry. Western-blot analysis also indicated that the gray value of Nogo-A protein band in the oligodendroglioma group was significantly higher than that in the anaplastic oligodendroglioma group.</p><p><b>CONCLUSION</b>Nogo-A expression was negatively correlated with the malignancy grade of oligodendroglial tumors.</p>
Sujets)
Adulte , Femelle , Humains , Mâle , Adulte d'âge moyen , Marqueurs biologiques tumoraux , Métabolisme , Tumeurs du cerveau , Diagnostic , Métabolisme , Régulation négative , Physiologie , Immunohistochimie , Index mitotique , Protéines de la myéline , Métabolisme , Invasion tumorale , Diagnostic , Protéines Nogo , Oligodendrogliome , Diagnostic , Métabolisme , Valeur prédictive des testsRésumé
Objective To explore the effects of chronic electrical stimulation (ES) on Nogo-A expression in the hippoeampus of rats.Methods Thirty male Wistar rats were randomly divided into a control group and 4 exper- imental groups.The rats in the control group were given sham ES,while those in the experimental groups received 1, 3,6,or 9 days of ES before being sacrificed for the detection of Nogo-A expresson in the hippoeampus by immunohis- tochemistry and Western plotting.Results There was a positive correlation between the level of Nogo-A expression and the duration of ES,as shown by the immunohistochemistry technique.Western blotting showed the same result. Conclusion In general,seizure occurred 8 days after electrical stimulation began.Elevated Nogo-A expression in the hippocampus began earlier than seizures in the epilepsy model groups.