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April 2009 in “Journal of comparative neurology” P2X3-IR fibers are widespread in rat skin and likely help detect pain.
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July 1999 in “Journal of Anatomy” Methylene blue staining effectively highlights detailed nerve structures in rat fur.
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April 2020 in “bioRxiv (Cold Spring Harbor Laboratory)” The skin has about 230,000 touch-sensitive nerve fibers, with high concentrations in the hands and face.
Neuropeptides affect hair growth and could be used to control it.
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January 2015 in “Biochimica and biophysica acta. Molecular and cell biology of lipids” Lysophosphatidic acid affects sensory neurons and may cause neuropathic pain and itch.
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August 2003 in “Journal of comparative neurology” Naked mole-rats have unique skin and hair nerve structures, lacking certain pain and temperature-related neuropeptides.
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February 2010 in “Journal of Neurophysiology” Microstimulation of certain facial and mouth nerves can evoke specific sensations, while deeper nerves may require multiple stimulations to affect perception.
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December 2008 in “Current medicinal chemistry” Stimulating sensory neurons can increase IGF-I production, which may help treat various diseases and improve tissue health.
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January 2001 in “PubMed” Mechanoreceptors convert physical touch into electrical signals through specialized nerve structures.
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February 2022 in “The journal of neuroscience/The Journal of neuroscience” Deleting the PTEN gene in mice causes nerve cells to grow larger and heal better after injury, but may cause overgrowth and hair loss in older mice.
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June 2023 in “bioRxiv (Cold Spring Harbor Laboratory)” Dopaminergic neurons in the gut have distinct subtypes, some releasing both dopamine and acetylcholine.
Certain short peptides can increase root hair growth in tobacco plants.