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A microscopic study was carried out on 10 specimens of visceral and superior mesenteric arteries and their branches, taken from domestic pigs. Some thickenings in the middle tunic of the visceral artery and its main branches were observed. The thickenings appeared at intervals of about 2 cm and were even several centimetres long. The structure of the thickenings was similar. Besides numerous circularly arranged elastic fibres, it contained clusters of modified myocytes located under the stratifying internal elastic membrane. In cross-sections, the myocytes, lying perpendicularly to the proper muscle layer, looked like epithelial cells, and due to that, they were defined as epithelial muscle cells. They formed a distinct ring around the vessels (superior mesenteric artery). They may play the regulatory function in relation to the circularly arranged myocytes.
The vasoactive intestinal peptide (VIP) and opioid family member Leu⁵-enkephalin (LENK) have already been established as playing independently significant roles in the functioning of the female genital tract. However, the mutual influence of both neuropeptides on female genital function has not been examined until now. Therefore, the aim of this study was to compare the distribution of VIP- and/or LENK-immunoreactive (IR) structures throughout the female genital tract of the pig. Immunohistochemical examination revealed that the great majority of the immunopositive structures co-expressed both peptides. Nevertheless, a small population of exclusively VIP- or LENK-IR processes and perikarya were also distinguished. The muscular layer of the organs examined revealed the greatest density of VIP- and/or LENK-IR nerve fibers. The mucosa of the ampulla, isthmus, cervix and vagina was supplied with a moderate number of single labeled LENK-IR processes, while exclusively VIP-IR fibers were found mainly in vaginal mucosa. The infundibulum was found to be poorly supplied with single labeled VIP- or LENK-IR fibers. The paracervical ganglion (PCG), the expected source of VIP- and/or LENK-IR nerve fibers innervating the organs under investigation, has been found to contain double labeled LENK-/VIP-IR as well as single labeled VIP-IR perikarya. The great number of specific co-localization between VIP and LENK in nerve processes of the porcine female genital organs may indicate a functional regulatory interaction between the neuropeptides studied, requiring further study.
The aim of the study was to determine the existence and co-existence patterns of VIP and NPY in neurons and nerve fibers of porcine lumbar-sacral sympathetic chain ganglia. The studied ganglia were fixed with 4% buffered paraformaldehyde (perfusion) and then labeled by means of double-immunofluorescence using a mixture of antibodies cultivated in different species. The highest number of NPY-positive cells was observed in the lumbar ganglia and diminished in the direction of the caudal, where only single neurons were observed. In contrast, a different pattern of distribution was observed for VIP-positive neurons, whose number was higher in the more caudally located ganglia. Two populations of VIP-positive neurons could be distinguished: single, showing strong immunofluorescence and often with visible processes, located in the central part of the ganglia and a second population, composed of clusters of 4-8 cells and often co-localizing NPY. VIP-positive nerve fibers surrounded both NPY+ neurons and neurons lacking either NPY and/or VIP. The presence of a small number of NPY-positive neurons exhibiting very weak immunofluorescence in more caudally located SChG could suggest a "switch" of neuromediators produced there. An increase in the percentage of non-noradrenergic sympathetic neurons in more caudally located SChG may thus be implicative for a specific innervation pattern of target tissues of these ganglia.
The aim of the study was to establish whether the dorsal root ganglion neurons supplying the porcine CaMG contain SP and/or CGRP and, additionally, which changes in the expression pattern of these peptides may be induced by a mechanical injury applied to the processes of the above neurons. The study was carried out on consecutive frozen serial sections of DRG taken from 12 eight-week old pigs, in which the neuronal tracer Fast Blue (FB) had been injected three weeks previously into the right CaMG. Six animals were then randomly chosen for ipsilateral ganglionectomy. Eventual changes in the chemical phenotypes of the injured cells were studied a week later using routine double-immunofluorescence labeling. FB+ neurons contained SP and CGRP (32% and 42%, respectively). The vast majority of SP- and CGRP-IR afferent cells belonged to the class of medium-sized (64% and 59%, respectively) and small neurons (32% and 37%, respectively). A co-localization of SP and CGRP was observed in 22% of FB+ neurons. The resection of CaMG resulted in a dramatic increase in the number of FB+ cells containing SP (55%) and a statistically significant decrease in the number of CGRP-IR neurons associated with CaMG (29%). These results suggest that sensory neurons associated with porcine CaMG contain SP and CGRP and that a re-section of CaMG is able to induce profound changes in the expression pattern of the studied peptides, implying deep mechanical injury-induced adaptative changes in the studied afferent neurons.
This study was performed on the European bison and aimed at determining the existence of a placental dopamine ß-hydroxylase (DßH; EC 1.14.17.1) protein expression localised by fluorescent immunohistochemistry (F-IHC); and at identifying a profile of the DßH expression throughout the placenta development. Placentomal sections were prepared from the placentas collected from females during two pregnancy stages (60 and 120 d post coitum). F-IHC was performed with the use of primary rabbit serum against DßH that was visualised by a secondary donkey F(ab)₂ IγG fragment against the rabbit IγG-conjugated with CY₃. The DßH expression was demonstrated within the maternal parts (caruncles) of the placentome structures developed within the synepitheliochorial placenta in the first half of pregnancy. The DßH expression profile is associated with the maternal blood vessel development as the pregnancy advances. It seems that the DßH expression is involved in the regulation of the endometrial angiogenesis, and may play an important role as a neurotransmitter existing in the European bison placenta. This is the first paper describing the expression of DßH in the European bison.
This study describes the expression of DßH as a marker of sympathetic (catecholaminergic) innervation in the vestigial uterus of adult European bison (Eb) bulls. Cryo-sectioned uteri were examined by fluorescent immunohistochemistry with the use of primary rabbit DßH polyclonal antibodies. The DßH-immunocomplexes (antigens/polyclonals) were visualised by secondary donkey antirabbit biotinylated IγG, and then with cyanine (CY™3)-conjugated streptavidin. The DßH immunodetection with CY™3 for the Eb uterine sections was performed in parallel to a positive control (porcine sympathetic paravertebral ganglion), and a negative control (without primary anti-DßH polyclonals). This is the first paper describing the identification of DßH expression within the vestigial uterus of the adult Eb bulls. The distribution pattern of DßH expression localised within immunoreactive (IR) uterine nerve fibres of the bulls resembled that in the control female uterus. The DßH-IR nerve fibres were identified in the entire cross-section of each uterus, with generally higher density in the myometrium than in the endometrium. The ratio of the endometrial/myometrial DßH-expression (percentage of area with IR-signals) was comparable in all males and females (0.78 and 0.64, respectively). However, the DßH-expression area (%) was significantly lower within the male uterine endometrial (P<0.01) and myometrial regions (P<0.001) comparing to the female counterparts. Presumably, the DßH-IR expression within the male Eb uterus is associated with a trophic effect of noradrenaline released by sympathetic nerve fibres influencing nutrient supply of this vestigial organ in the Eb bulls.
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