Overview
- University of Chicago researchers reported Thursday in Science Advances a nicotine‑triggered lung‑to‑brain signal involving rare pulmonary neuroendocrine cells.
- In stem‑cell models, these lung cells released exosomes—tiny packets—rich in serotransferrin that disrupted how neurons regulate iron.
- The iron shift led to oxidative stress, mitochondrial dysfunction, higher alpha‑synuclein, and signs of ferroptosis linked to neurodegeneration.
- The team proposes the vagus nerve as the pathway that carries the lung signal to the brain.
- Researchers say the work is early‑stage and will test exosome blockers in animals and humans, as prior studies have tied heavy midlife smoking to more than double the risk of later‑life dementia.