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Molecular profiling reveals synaptic release machinery in Merkel cells
Henry Haeberle1, Mika Fujiwara, Jody Chuang
1Department of Physiology, University of California-San Francisco, 600 16th Street, San Francisco, CA 94143-2280, USA.
Summary
Merkel cells, integral to gentle touch perception, are excitable and release neurotransmitters. This study reveals their potential role in shaping somatosensory input through synaptic mechanisms.
Area of Science:
- Neuroscience
- Cell Biology
- Dermatology
Background:
- Merkel cell-neurite complexes are key somatosensory receptors for gentle touch.
- The precise function of Merkel cells within these complexes remains debated.
Purpose of the Study:
- To investigate if Merkel cells are genetically programmed to be excitable and participate in touch reception.
- To elucidate the molecular mechanisms underlying Merkel cell function in somatosensation.
Main Methods:
- Purification of Merkel cells from skin touch domes.
- Differential gene expression analysis using DNA microarrays.
- Immunohistochemical staining for synaptic proteins.
- Calcium (Ca2+) imaging to assess cellular excitability.
Main Results:
- Identified 362 Merkel-cell-enriched transcripts, including neuronal factors, presynaptic molecules, and ion channels.
- Confirmed expression of presynaptic proteins (piccolo, Rab3C, VGLUT2, CCK) in Merkel cells.
- Demonstrated the presence of L- and P/Q-type voltage-gated Ca2+ channels in Merkel cells, indicating functional excitability.
Conclusions:
- Merkel cells are excitable cells capable of neurotransmitter release.
- These cells are poised to release glutamate and neuropeptides, potentially modulating touch sensitivity.
- The findings support an active role for Merkel cells in somatosensory processing.