Pain Matters: Nociceptive signaling drives neural encoding of inflammatory responses

Nociceptive signaling is essential for the brain to encode and later replay inflammatory states, with TRPV1+ sensory neuron activity and analgesia determining insular cortex retrievability.

• Why it matters: Pain is a hallmark of inflammation, but how peripheral nociceptive input shapes brain representations of inflammatory events is unclear.
• What they did: Human fMRI and mouse activity mapping were used to define distinct brain states from peripheral inflammation; in mice, TRPV1+ sensory neuron ablation or pharmacological analgesia disrupted insular cortex immune representations, while boosting nociceptive signaling strengthened immune recall.
• The result: Peripheral inflammation can be represented as a retrievable brain state, and nociceptive input controls whether the insula forms and later retrieves those immune representations.

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