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Calcitonin gene-related peptide (CGRP) immunoreactivity in the neuroendocrine Merkel cells and nerve fibres of pig and human skin

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Summary

The presence of calcitonin gene-related peptide (CGRP) in the skin of pig snout and human fingertip was investigated using immunohistochemical techniques. CGRP immunoreactivity was found in Merkel cells and nerve fibres of both species. In pig snout skin, Merkel cells containing CGRP were seen forming clusters at the tips of rete ridge epidermis and in the external root sheath of sinus hair follicles (vibrissae). Human Merkel cells immunostained for CGRP were found isolated or forming small groups in the basal layer of glandular epidermal ridges. In all cases, immunoreactivity was more intense on the side of the Merkel cell facing the associated nerve terminal (which was never positive for CGRP). This part of the Merkel cell has the greatest density of dense-cored granules, suggesting that CGRP must be stored in these granules. Nerve, bundles containing CGRP-immunoreactive fibres were found at dermal and hypodermal level, and blood vessels were often surrounded by CGRP nerve fibres. In pig snout skin some nerve fibres containing CGRP penetrated the epidermis and terminated as free endings, and in the human fingertip a small number of CGRP-immunoreactive nerve fibres were seen in Meissner's corpuscles.

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Authors and Affiliations

  1. Departmento de Ciencias Morfológicas (Cátedra de Histología Humana) Servicio Microscopía Electrónica, Facultad de Medicina, Hospital General de Galicia, Universidad de Santiago de Compostela, E-15705, Santiago de Compostela, Spain

    T. García-Caballero, R. Gallego, E. Rosón, M. Fraga & A. Beiras

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  1. T. García-Caballero
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  2. R. Gallego
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  3. E. Rosón
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  4. M. Fraga
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  5. A. Beiras
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García-Caballero, T., Gallego, R., Rosón, E. et al. Calcitonin gene-related peptide (CGRP) immunoreactivity in the neuroendocrine Merkel cells and nerve fibres of pig and human skin. Histochemistry 92, 127–132 (1989). https://doi.org/10.1007/BF00490231

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  • DOI: https://doi.org/10.1007/BF00490231

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