Light and electron microscopic study of the distribution of substance P-immunoreactive fibers and neurokinin-1 receptors in the skin of the rat lower lip

I. Ruocco, A. Cuello, R. Shigemoto, A. Ribeiro Da Silva, Journal of Comparative Neurology 432 (2001) 466–480.

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Author
Ruocco, Isabella I; Cuello, Augusto C; Shigemoto, RyuichiIST Austria ; Ribeiro-da-Silva, Alfredo
Abstract
Cutaneous antidromic vasodilatation and plasma extravasation, two phenomena that occur in neurogenic inflammation, are partially blocked by substance P (SP) receptor antagonists and are known to be mediated in part by mast cell-released substances, such as histamine, serotonin, and nitric oxide. In an attempt to provide a morphological substrate for the above phenomena, we applied light and electron microscopic immunocytochemistry to investigate the pattern of SP innervation of blood vessels and its relationship to mast cells in the skin of the rat lower lip. Furthermore, we examined the distribution of SP (neurokinin-1) receptors and their relationship to SP-immunoreactive (IR) fibers. Our results confirmed that SP-IR fibers are found in cutaneous nerves and that terminal branches are observed around blood vessels and penetrating the epidermis. SP-IR fibers also innervated hair follicles and sebaceous glands. At the ultrastructural level, SP-IR varicosities were observed adjacent to arterioles, capillaries, venules, and mast cells. The varicosities possessed both dense core vesicles and agranular synaptic vesicles. We quantified the distance between SP-IR varicosities and blood vessel endothelial cells. SP-IR terminals were located within 0.23-5.99 μm from the endothelial cell layer in 82.7% of arterioles, in 90.2% of capillaries, and in 86.9% of venules. Although there was a trend for SP-IR fibers to be located closer to the endothelium of venules, this difference was not significant. Neurokinin-1 receptor (NK-1r) immunoreactivity was most abundant in the upper dermis and was associated with the wall of blood vessels. NK-1r were located in equal amounts on the walls of arterioles, capillaries, and venules that were innervated by SP-IR fibers. The present results favor the concept of a participation of SP in cutaneous neurogenic vasodilatation and plasma extravasation both by an action on blood vessels after binding to the NK-1r and by causing the release of substances from mast cells after diffusion through the connective tissue.
Publishing Year
Date Published
2001-04-16
Journal Title
Journal of Comparative Neurology
Volume
432
Issue
4
Page
466 - 480
IST-REx-ID

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Ruocco I, Cuello A, Shigemoto R, Ribeiro Da Silva A. Light and electron microscopic study of the distribution of substance P-immunoreactive fibers and neurokinin-1 receptors in the skin of the rat lower lip. Journal of Comparative Neurology. 2001;432(4):466-480. doi:10.1002/cne.1114
Ruocco, I., Cuello, A., Shigemoto, R., & Ribeiro Da Silva, A. (2001). Light and electron microscopic study of the distribution of substance P-immunoreactive fibers and neurokinin-1 receptors in the skin of the rat lower lip. Journal of Comparative Neurology, 432(4), 466–480. https://doi.org/10.1002/cne.1114
Ruocco, Isabella, Augusto Cuello, Ryuichi Shigemoto, and Alfredo Ribeiro Da Silva. “Light and Electron Microscopic Study of the Distribution of Substance P-Immunoreactive Fibers and Neurokinin-1 Receptors in the Skin of the Rat Lower Lip.” Journal of Comparative Neurology 432, no. 4 (2001): 466–80. https://doi.org/10.1002/cne.1114.
I. Ruocco, A. Cuello, R. Shigemoto, and A. Ribeiro Da Silva, “Light and electron microscopic study of the distribution of substance P-immunoreactive fibers and neurokinin-1 receptors in the skin of the rat lower lip,” Journal of Comparative Neurology, vol. 432, no. 4, pp. 466–480, 2001.
Ruocco I, Cuello A, Shigemoto R, Ribeiro Da Silva A. 2001. Light and electron microscopic study of the distribution of substance P-immunoreactive fibers and neurokinin-1 receptors in the skin of the rat lower lip. Journal of Comparative Neurology. 432(4), 466–480.
Ruocco, Isabella, et al. “Light and Electron Microscopic Study of the Distribution of Substance P-Immunoreactive Fibers and Neurokinin-1 Receptors in the Skin of the Rat Lower Lip.” Journal of Comparative Neurology, vol. 432, no. 4, Wiley-Blackwell, 2001, pp. 466–80, doi:10.1002/cne.1114.

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