TNF and nasopharyngeal carcinoma: To examine this point, the effects of 7 d NPC transplantation on microglial and astrocyte inflammatory responses and levels of the proinflammatory cytokine, TNF-α were examined in five animal groups; Aβ1-42 or PBS injected rat hippocampus, Aβ1-42 plus NPC, Aβ1-42 plus dead NPC and NPC alone; PBS served as a control for peptide injection and dead NPC were used as a control for NPC.