Abstract
BACKGROUND: Studies on basal laminas in the tissues of the enteric nervous system are few and are carried out on experimental models in vivo and in vitro, performed on animals. The morphological features of the structure and localization of BL, their cellular sources of origin in various tissues of the gastrointestinal tract in normal and pathological conditions remain poorly studied.
AIM: Study of morphological features and distribution of basal laminas in human colon tissues and their changes in pathology.
MATERIALS AND METHODS: Fragments of the large intestine, obtained as a result of surgery for chronic slow-transit constipation, performed in S. M. Kirov Military Medical Academy were studied. The selective marker of basal laminas, type IV collagen, as well as neuronal and glial immunohistochemical markers (PGP 9.5, GFAP, S100 proteins) were used in the work
RESULTS: It has been shown that the greatest immunoreactivity within the intestinal wall is observed in the myenteric membrane, weak in the vessels of the submucosa, locally expressed in the subepithelial region of the mucous membrane (in the upper sections of the crypts). In smooth muscle, basal laminas were found around the smooth muscle cells of the longitudinal and concentric layers of the muscular membrane, mucous membrane, veins and arteries, as well as in the endothelium. It has been shown that the ganglionic Auerbachs plexus is delimited from closely adjacent muscle layers of a continuous basal lamina, similar to the basal plate (glia limitans) of the brain and spinal cord of the CNS. It is clearly defined by its appearance it has the form of a continuous hollow tubular structure. The sources of the formation of the basal plate around the ganglia of Auerbach and Meissners plexuses are various glial elements: in the first plexus, astrocyte-like and non-myelinated Schwann cells (both types located in the neuropil), and in the second plexus, glia of the autonomic nervous system (satellite cells of neurons and neurolemmocytes of postganglionic nerve fibers).
CONCLUSIONS: For the first time, the transition of basal lamina from the Auerbachs plexus to numerous basal plates of neurolemmocytes of the Remakov fibers of the main terminal nerve plexus, which are involved in the innervation of the smooth muscle cells of the muscular membrane, is shown. Signs of dystrophic changes in the basal lamina structure associated with pathological changes in chronic slow transit constipation (tissue edema, inflammatory reactions, manifestations of agangliosis, gliosis, focal denervation of muscle cells, degeneration of nerve endings of neuromuscular and ganglionic plexuses) are shown in the work.