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Segregation of NGF receptor in sensory receptors, nerves and local cells of teeth and periodontium demonstrated by EM immunocytochemistry

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Journal of Neurocytology

Summary

Nerve growth factor receptor immunoreactivity (NGFR-IR) in sensory nerves and somatosensory receptors of adult rat dental and periodontal tissue was analysed using a monoclonal antibody (192-IgG) and electron microscopy. In dental and periodontal nerves, the unmyelinated axons and their Schwann cells had occasional labelling of their cell membranes, and myelinated axons had none. Dental free nerve endings in predentin had varied NGFR-IR: 15% were unlabelled, 25% had some axonal membrane NGFR-IR, and 60% had intense membrane label and cytoplasmic staining. In periodontal ligament there were two types of NGFR-IR somatosensory receptors: Ruffini mechanoreceptors had extensive NGFR-IR on apposed membranes of the terminal Schwann cell and nerve endings, but no labelling of the neural fingers which extended out into the ligament tissue; and thin fibres had intense membrane NGFR-IR and cytoplasmic stain.

Non-neuronal NGFR-IR had cell specific patterns: perineurial and endoneurial cells and Ruffini terminal Schwann cells had NGFR-IR on cell membranes and inside numerous pinocytotic vesicles; Schwann cells along unmyelinated axons had NGFR-IR cell membrane intensities which varied depending on the NGFR-IR intensity of the enclosed axons; odontoblasts were unlabelled except at sites of contact with the NGFR-IR pulpal or neural cells; pulp fibroblasts in the subodontoblast zone had intense NGFR-IR all along their cell membrane; and ligament fibroblasts were unlabelled.

The diverse NGFR-IR patterns described here suggest that there are specific categories of cellular expression and localization which correlate with somatosensory receptor type, and that specific patterns also characterize various non-neuronal cells in dental and periodontal tissue. Only the endoneurial cells, perineurial cells, and Ruffini terminal Schwann cells had NGFR-IR endocytotic vesicles, suggesting NGF internalization by high-affinity receptors.

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  1. Departments of Anesthesiology and Biological Structure, University of Washington RN-10, 98195, Seattle, WA, USA

    M. R. Byers

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Byers, M.R. Segregation of NGF receptor in sensory receptors, nerves and local cells of teeth and periodontium demonstrated by EM immunocytochemistry. J Neurocytol 19, 765–775 (1990). https://doi.org/10.1007/BF01188044

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