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The quantities and distribution patterns of serotonin-immunoreactive (serotonin-IR) enterochromaffin cells (EC) were studied immunohistochemically in the small intestine of suckling piglets stimulated with red kidney bean lectin, and in non- stimulated, control animals. The co-expression patterns of serotonin with somatostatin (SOM) or corticotropin releasing-factor (CRF) were also studied. After the lectin treatment, the increased numbers of EC were noted in the duodenum of experimental animals. Lectin stimulation did not change the proportions of EC in the jejunum and ileum. In the duodenal epithelium of the lectin-stimulated piglets, the vast majority of serotonin-IR EC were distributed at the basis of crypts. After the lectin administration, the proportions of serotonin-IR/SOM-IR EC were statistically similar in all sections of the small intestine. No upregulation of CRF was found in duodenal, jejunal, and ileal EC of lectin-treated animals. The findings demonstrated that red kidney bean lectin increased the serotonin reservoir in the duodenum, and thus may be an effective stimulant of the gut maturation in suckling mammals.
The experiment was performed on sexually mature female dogs. Operational procedures were performed according to classical surgical methods in general anaesthesia. The animals were kept alive for 21 days and subsequently put down and sectioned for the following material: the brain stem, the spinal cord with all the spinal ganglia, all the ganglia of the sympathetic trunk and the ganglia and plexuses of abdominal and pelvic cavities. The material was fixed in histological slides. The localization of retrograde changes, presented here, allows certification that the autonomic and afferent nerve fibres supplying the uterine cervix in the female dog originate from the central, as well as, from the peripheral autonomic nervous system.
The study was conducted on sexually mature female dogs. The extirpation of the different parts (both homs and body) of the uterus was performed. After 21 days, the following material for examination was collected: the brain stem, the thoraco-lumbo-sacral part of the spinal cord with its all spinal ganglia, sympathetic chain and also the ganglia and nerve plexuses of the abdominal and pelvic cavities. The experiments produced retrograde changes in nerve cells of the central and peripheral nervous system in the experimental animals. The comparison of the localization of retrograde changes in the neurons of the experimental animals and those of the control animal provided the basis for tracing the localization of the nerve cells which are the source of the nerve fibres supplying the horns and body of the uterus. The observations performed establish that these fibres are of multisource origin.
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