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Recent studies have shown that TNF may act as a neuromodulator in the hindbrain to produce malaise by potentiating visceral afferent signaling at the central processes of the vagus nerve. However, the mechanism by which TNF produces this signal amplification is not known. Our time-lapse calcium imaging studies of individual central vagal afferent varicosities in the caudal brainstem slice preparation show that, although TNF has minimal direct effects to elevate terminal intracellular calcium levels, TNF does potentiate the terminal afferent responses to other stimuli through a ryanodine-based, calcium-induced calcium release mechanism. 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