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Lntraepidermal Free Nerve Fiber Endings in the Hairless Skin of the Rat As Revealed by the Zinc Iodide-Osmium Tetroxide Technique

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Lntraepidermal Free Nerve Fiber Endings in the Hairless Skin of the Rat As Revealed by the Zinc Iodide-Osmium Tetroxide Technique Histol Histopathol (2000) 15: 493-498 Histology and 001: 10.14670/HH-15.493 Histopathology http://www.hh.um.es Gel/u/ar and Molecular Biology lntraepidermal free nerve fiber endings in the hairless skin of the rat as revealed by the zinc iodide-osmium tetroxide technique T. Müller lnstitute for Anatomy, University of Mainz, Germany Summary. The nerve fiber distribution in the epidermis was not called in question (for review see Müller, 1998). of the hairless rat skin was studied light microscopically After the establishment of the electron microscope in by means of zinc iodide-osmium tetroxide staining. Two neuroanatomic research, the occurrence of such nerve different morphological types of free nerve fiber endings fibers could not be proved for a long time, but was could be detected: clusters of relatively thick nerve finally confirmed by Cauna (1980). Nevertheless, Cauna fibers stretched up through the spinous layer up to the (1980) could only detect a few axons penetrating the granular layer sending off terminal branches. In addition, epidermis. During the eighties, immunohistochemical many solitary thin varicose nerve fibers were seen within techniques for the detection of the neuropeptides the epidermis. The observed discrepancies in nerve fiber substance P (SP) and calcitonin-gene-related peptide diameters appeared to be larger than those reported for (CGRP) were developed which could also demonstrate human intraepidermal nerve fibers in recent immuno­ subpopulations of intraepidermal nerve fibers (Kruger histochemical studies. Moreover, dendritic cells, most et al., 1985, 1989). Finally, larger amounts of probably representing Langerhans cells, could be intraepidermal nerve fibers were visualised by selectively stained. These cells appeared to be in a clase immunohistochemistry on protein gene product 9 .5 location to thin varicose nerve fibers. Both types of (PGP 9.5) (Wang et al., 1990). demonstrated free nerve endings have to be functionally In early studies performed by methylene blue connected with different sensoric functions. Possibly, a supravital staining, different morphological types of subpopulation of the thin nerve fibers might possess intraepidermal nerve fibers could be shown (Botezat, primarily a nociceptive task, whereas the thick ones have 1912). U nfortunately, these o bservations were only most probably to be regarded as mechanoreceptive. The documented by drawings. A similar discrimination is nerve fibers innervating dendritic cells appear to be also possible in the hairy and hairless skin on the snout identical to the peptidergic ones which may regulate the of rodents by PGP 9 .5-immunohistochemistry (Rice et antigen-presenting capacity of these cells. Due to its al., 1993; Crivellato et al., 1994). Up to now, a selectivity for intraepidermal nerve fibers, the used differentiation of morphological nerve fiber types was method might supplement immunohistochemical still not possible in the hairless skin of the rat paws by procedures in a helpful manner. immunohistochemistry. Recently, Müller (1998) confirmed by means of methylene blue supravital Key words: Neuroimmunology, Mechanoreception, staining the former results of Botezat (1912) and Thermoreception, Nociception, methylene blue published the first photographs of different morphological nerve fiber endings in the epidermis of the rat paws obtained by supravital methylene blue lntroduction staining. The zinc iodide-osmium tetroxide (ZIO) technique From the introduction of gold chloride impregnation, was introduced in neuroanatomy by Maillet (1959). supravital methylene blue staining and silver Later, only one paper has been published which reported impregnation as neurohistological techniques during the that the method is also suited for staining intraepidermal 19th century to the mid of the 20th century, the existence nerve fibers, but without showing any details (Jabonero of free nerve endings within the epidermis of the skin and Perez Casas, 1962). Recently, this procedure was light microscopically used for the demonstration of Offprint requests to: Priv.-Doz. Dr. Thomas Müller, lnstitute far Anatomy, nerve fibers in the epidermis of the hairy skin on the rat University of Mainz. Saarstr. 19-21, 0·55099 Mainz, Federal Republic of snout (Müller, 1999). Germany. Fax: (49) (61 31) 3925401. e-mail: [email protected]­ U p to now, this method has not been applied to a mainz.de systematic investigation of intraepidermal nerve fibers in 494 lntraepidermal free nerve fiber endings the hairless skin. Therefore, the aim of the present study an intermedium. Sorne semithin sections of 1 µ m were was to use the ZIO-technique for the investigation of the transferred through xylene, coverslipped with DePeX®, hairless palmar and plantar skin of the rat paws. The and also used for light microscopy. They servcd as results are compared with recent findings obtained by controls for the exact localization of the stained immunohistochemistry as well as methylene blue structures. supravital staining. Results Materials and methods The light microscopic investigation of the 30 µm• Treatment of animals thick paraffin sections revealed an intense staining of the stratum corneum and a selective staining of nerve fibers General principies of animal care were applied and dendritic cells in the dermis as well as epidermis throughout these experiments and ali procedures (Figs. 1-8). Two different types of free nerve fiber complíed with the German law on the protection of endings could be identified. The first type was animals. Adult Sprague-Dawley rats were used for the characterized by a cluster of relatively thick nerve fiber experiments. The animals were anaethetised with branches of 1-2 ,um in diameter stretching up to the tribromethanol (0.3 mg/kg) followed by cervical superficial layers of the epidermis; primarily in the upper dislocation. Small pieces (approximately 2 mm2 layers, these branches sent off terminal collaterals epithelial surface) of the hairless skin obtained from the forming a more or less complicated intraepithelial plexus palmar and plantar sites of the paws were investigated. (Figs. 1, 3, 5, 6). The second type was represented by ascending thin varicose nerve fibers with diameters of Staining with the Z/0 technique less than 0.5 ,um (Figs. 1, 2, 7, 8). The stained nerve fiber profiles could also casily be identified in the 1 µm• lmpregnation by the ZIO technique was performed semithin sections and their locations in the dermis as according to Maillet (1959) as modified by Müller well as epidermis could doubtlessly be proved (Figs. 9- (1999). For this purpose, 2 stock solutions were 11). In addition, a labeling of intraepidermal dendritic necessary. The first was 2% aqueous osmium tetroxide. cells was observed in the paraffin and semithin sections The second was prepared by adding 12-15 gramm zinc (Figs. 1, 2, 4, 7, 8, 10). The staining intensity of these powder and 5 gramm iodine to 200 ml distilled water cells was not the same in ali cases. In sorne sections, and subsequent shaking in a heat-stable glass bottle only a staining of the region of the nuclear envelope ( exothermic reaction). One part of the first stock solution besides a slight staining of the cytoplasm could be was mixed with 4 parts of the second reagent. The detected (Figs. 8, 10). Nevertheless, strongly stained thin tissues were then immersed in this mixture for 15-30 nerve fibers were observed in the vicinitv of these cells hours at room temperature. Subsequently, the specimens or apparently in contact with them (Figs. 8, 10). were washed overnight in distilled water. The tissues were dehydrated in 100% tertiary Discussion butano! (melting point: 25 ºC) for 48 hours. The alcohol was changed several times. After dehydration, the The presentcd findings confirm the recent light specimens were stored for 1 hour in a mixture of 8 parts microscopic observations achieved by supravital decahydronaphthalene (Dekalin®; Chroma, Kongen, methylene blue staining (Müller, 1998). In this context, Germany) and 2 parts methyl benzoate. Before the most interesting result of the present study was that a embedding in paraffin, they were immersed for another discrimination between two different morphological hour in pure decahydronaphthalene. 30 µm-thick types of free nerve fiber endings was possible in the sections were mounted on untreated glass slides. After epidermis of the hairless skin of the rat paws. The drying, they were deparaffinised in xylene and observations are partially in accordance with results coverslipped with DePeX® (Serva, Heidelberg. obtained by means of immunohistochemistry. In detail, Germany ). Then, the sections were viewed under the this means that the intracpídermal nerve fibers stretch up light microscope. to the superficial cell layers, where they form terminal Due to the thickness of the paraffin sections branches. combined with the 3-dimensional structure of the stained Nevertheless. the ZIO-stained sections are in sinuous nerve fibres, the tissue was focused and apparent contrast to comparable immunohistochemical photographed in different planes. Photomontages were studies performed on the rat skin regarding certain required to visualise the intraepidermal routes of the aspects (Navarro et al., 1995; Stankovic et al., 1996; nerve fibres. Verdu and Navarro, 1997); i.e. such a clear After transfer through xylene, the paraffin sections differentiation of two different morphological types of were removed from the glass slides. Then, thev were free nerve fiber endings
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