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1 We have reviewed the current state of knowledge about the presence, characteristics and arrangement of TCs/CD34+stromal cells in the normal and pathological peripheral nervous system (PNS), including light and electron microscopic studies in nerves, senso + 6175 word(s) 6175 2020-06-23 10:16:21 |
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Telocytes/CD34+ stromal cells in the normal and pathological peripheral nervous system (PNS). We consider the following aspects: (A) general characteristics of telocytes; (B) the presence, characteristics and arrangement of telocytes in the normal PNS, including i) nerve epi-perineurium and endoneurium (e.g., telopodes extending into the endoneurial space); ii) sensory nerve endings (e.g., Meissner and Pacinian corpuscles, and neuromuscular spindles); iii) ganglia; and iv) the intestinal autonomic nervous system; (C) the telocytes in the pathologic PNS, encompassing (i) hyperplastic neurogenic processes (neurogenic hyperplasia of the appendix and gallbladder), highly demonstrative of telocyte characteristics and relations, (ii) PNS tumours, such as neurofibroma, schwannoma and granular cell tumour. 

telocytes nerves peripheral nervous system tumours neurogenic hyperplasia
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1. General Characteristics of Telocytes and Terminological Introduction

Figure 3. TCs/CD34+SCs (brown) around appendiceal hyperplastic nerve fibres (Schwann cells and axons) (red) (AG) and neuronal–glial units (B,H). Sections stained with anti-CD34 (brown) and anti-S-100 (red) (A, C–E and G and H) and anti-CD34 and anti-neurofilaments (B and D). Numerous fusiform or stellate TCs and their telopodes (brown) are observed around the aforementioned structures. The TCs and telopodes follow the path of the nerve fibres and establish contact with TCs of other nerve fibres and smooth muscle cells. It should be noted how thinner telopodes can originate from the somatic region of the TCs (Figure 3E) or from thicker and initial telopodes (Figure 3G). Bar: A, B, 20 µm; C-H, 10 µm

Figure 4. TCs/CD34+SCs around nerve fibres (Schwann cells and axons) and neuronal–glial units growing in the appendiceal adipose and connective tissues, and in the adventitia of blood vessels in the presence of mast cells. Sections double-immunostained with anti-CD34 (brown) and anti-S100 (red) (A), anti-CD34 (brown) and anti-neurofilaments (red) (B) and anti-CD34 (brown) and c-kit (red) (insert in B). A: TCs/CD34+SCs (brown) are observed around neuronal–glial units between adipocytes (ad). It should be noted that the satellite glial cells are stained in red. B: Nerve fibres between the TCs/CD34+SCs of blood vessel adventitia (L: vessel lumen). Insert of B: A c-kit immunostained mast cell (red) associated with a TC/CD34+SC) (brown). Bar: A, 20 µm; B, 40 µm; insert of B, 10 µm.

Figure 5. TCs in the neurogenic hyperplasia of gallbladder. (A) Presence of TCs/CD34+SCs (brown) around and within a thick nerve in the gallbladder wall. Schwann cells expressing S-100 (red) are seen. (B,C) TCs/CD34+SCs (brown) between fascicles and independent nerve fibres arranged in different directions within the nerves. (D) Nerve fibres (expressing neurofilaments, red) between TCs/CD34+SCs (brown) in the blood vessel adventitia. (E) Nerve fibres in the chorion of the mucosa. The absence of TCs/CD34+SCs is noted. A and E: Sections double-immunostained with anti-CD34 (brown) and anti-S100 (red). B and C: Sections immunostained with anti-CD34 (brown). D: Section double-immunostained with anti-CD34 (brown) and anti-neurofilaments (red). Bar: A, C, 80 µm; B, 100 µm; D, 20 µm; F, 30 µm.

Figure 6. TCs/CD34+SCs in neurofibromas. (AC) Using double-immunostaining (anti-CD34 and anti-S100), numerous TCs/CD34+SCs (brown), intermixed with Schwann cells (red) are observed forming bundles with parallel, arciform or irregular arrangement. (D) TCs/CD34+SCs are also seen in the adventitia of blood vessels in the tumour. (E) CD34+ cells (ameboid dendritic cells) in a myxoid area of a plexiform neurofibroma. D and E: Immunostained with anti-CD34. Bar: A, 80 µm; B, D, 60 µm; C, 20 µm; E, 40 µm.

Figure 7. Multi-vacuolated cells (ameboid dendritic cells) in myxoid areas of plexiform neurofibromas. (AE) CD34 expression in the vacuolated cells, which partially retain their primitive fusiform or stellate morphology (A–C) or acquire a globe-like aspect, sometimes with a piriform appearance (D and E). (F) Alcian blue positivity in the extracellular matrix and in the vacuolated cells (G,H) Ultrastructural characteristics of the cells in the myxoid areas. Note the intracytoplasmic vacuoles and how one cell retains some processes (G), while the other acquires a globoid-like aspect (H). A–E: Anti-CD34 immunostaining. F: Alcian blue staining. G and H: Ultrathin sections. Uranyl acetate and lead citrate. Bar: A–E, 5 µm; F, 10 µm; G, H, 0.5 µm.

Figure 8. TCs/CD34+SCs in schwannomas and granular cell tumours. (AC) A schwannoma in which numerous TCs/CD34+SCs (brown) (A and B) are arranged around groups of Schwann cells, which form Verocay bodies (A and B) and express S100 (brown) (C). D and E: Granular cell tumour, in which TCs/CD34+SCs) (brown) (D) surround granular cells (granular S100-positive Schwann cells) (brown) (E). (F,G) Ultrastructural characteristics of the granular cells in whose environment some telopodes are observed (arrows). A to E: Sections immunostained with anti-CD34 (brown) (A, B, D) and anti S-100 (brown) (C and E). F and G: Ultrathin sections, Uranyl Acetate and Lead citrate. Bar: A, B, C, E, 80 µm; D, 60 µm; F, G, 0.5 µm.


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    Diaz-Flores, L. Telocytes. Encyclopedia. Available online: (accessed on 03 October 2022).
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    Diaz-Flores, L. (2020, June 29). Telocytes. In Encyclopedia.
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