This study examined the hepatoprotective and anti-inflammatory effects of anthocyanins from Vaccinim myrtillus (bilberry) fruit extract on the acute liver failure caused by carbon tetrachloride-CCl₄ (3 mL/kg, i.p.). The preventive treatment of the bilberry extract (200 mg anthocyanins/kg, orally, 7 days) prior to the exposure to the CCl₄ resulted in an evident decrease in markers of liver damage (glutamate dehydrogenase, sorbitol dehydrogenase, malate dehydrogenase), and reduced pro-oxidative (conjugated dienes, lipid hydroperoxide, thiobarbituric acid reactive substances, advanced oxidation protein products, NADPH oxidase, hydrogen peroxide, oxidized glutathione), and pro-inflammatory markers (tumor necrosis factor-alpha, interleukin-6, nitrite, myeloperoxidase, inducible nitric oxide synthase, cyclooxygenase-2, CD68, lipocalin-2), and also caused a significant decrease in the dissipation of the liver antioxidative defence capacities (reduced glutathione, glutathione S-transferase, and quinone reductase) in comparison to the results detected in the animals treated with CCl₄ exclusively. The administration of the anthocyanins prevented the arginine metabolism’s diversion towards the citrulline, decreased the catabolism of polyamines (the activity of putrescine oxidase and spermine oxidase), and significantly reduced the excessive activation and hyperplasia of the Kupffer cells. There was also an absence of necrosis, in regard to the toxic effect of CCl₄ alone. The hepatoprotective mechanisms of bilberry extract are based on the inhibition of pro-oxidative mediators, strong anti-inflammatory properties, inducing of hepatic phase II antioxidant enzymes (glutathione S-transferase, quinone reductase) and reduced glutathione, hypoplasia of Kupffer cells, and a decrease in the catabolism of polyamines.

The aim of this study was to analyze the expression of extracellular matrix (ECM) proteins in human endoneurium during aging. We harvested 15 cadaveric sural nerves, distributed in 3 age groups (I: 25-44, II: 45-64, III: 65-86 years old). Histological sections were stained immunohistochemically for the presence of collagen type I, type IV and laminin, and the ImageJ processing program was used in morphometrical analysis to determine the percentages of these endoneurial proteins. In two younger groups, the endoneurial matrix of the sural nerve was composed from about equal proportions of these proteins, which may be considered a favorable microenvironment for the regeneration of nerve fibers. Linear regression analysis showed a significant increase in endoneurial collagen type IV with age, while collagen type I and laminin significantly decreased during the aging process. In cases older than 65 years, remodeling of the endoneurial matrix was observed to be significantly higher for the presence of collagen type IV, and lower for the expression of collagen type I and laminin. This age-related imbalance of ECM proteins could represent a disadvantageous microenvironment for nerve fiber regeneration in older adults. Our findings contribute to the development of therapeutic approaches for peripheral nerve regeneration.

Anoctamin 1 (ANO1, TMEM16A) is a transmembrane protein belonging to the ANO family, with a role in the formation of calcium-activated chloride channels (CaCC). It is included in the regulation of physiological processes such as muscle contraction, gastrointestinal motility, secretion, and electrical excitability. Also, recent data suggest that ANO1 is a specific marker for interstitial cells of Cajal (ICC). The aim of the paper was to examine the spatial and temporal distribution of ANO1 in the human stomach, small intestine, and large intestine during embryofetal development as a potential marker for the differentiation of ICC and smooth muscle cells. As a material, we used 2 embryos and samples from 21 fetuses. The tissue samples were routinely processed into paraffin blocks, and 5 µm-thick sections were immunostained for ANO1. Our results show that ANO1 appears during embryonic development (8th week), and its expression continues through the fetal stages. Epithelial, endothelial and ICC cells consistently expressed ANO1 in all examined samples. Smooth muscle cells showed strong expression in muscularis propria, however by the 25th week this immunopositivity was absent from outer muscle layers in stomach and large intestine. In conclusion, ANO1 can be considered as a reliable marker for following the differentiation of SMC and ICC during embryonic and fetal development.

Background/Aim. Type IV collagen belongs to the group of nonfibrillar collagens and is an important component of the basement membranes, where it accounts for approximately 50% of its structural elements. The aim of the study was to describe the expression and distribution of collagen type IV in the embryonic and fetal metanephric kidney and to determine the volume density of collagen type IV in kidney tissue in each trimester of development. Methods. The material consisted of 19 human embryos/fetuses, in the gestational age from 8th to 37th week. Kidney tissue specimens were routinely processed to paraffin molds, stained immunohistochemically using polyclonal anti-collagen IV antibody and counterstained with Mayer hematoxylin and eosin. Stained slides were examined using a light microscope, and images of the selected areas under different lens magnification were captured with a digital camera. Volume density of collagen type IV was determined using ImageJ 1.48v and a plugin of the software, which inserted a grid system with 336 points. For the data comparison, the One-Way Analysis of Variance (ANOVA) was used. Results. Strong collagen IV immunopositivity was seen in all specimens, with a distribution in the basement membranes of urinary bud, parietal leaf of Bowman?s capsule, glomerular basement membrane, basement membrane of interstitial blood vessels, and basement membranes of nephron tubules and collecting ducts. No statistically significant difference in the volume density of type IV collagen was found among the different trimesters of the embryonic and fetal development. Conclusion. The synthesis and secretion of collagen type IV simultaneously follow the development of nephron structures, collecting system and blood vessels. The volume density of collagen type IV remains constant throughout all the trimesters of metanephric kidney development, indicating that it plays a crucial role in the normal development of nephron and collecting system structures, as well as in maintaining the normal kidney function.

Background and Objectives: The treatment of duodenal injuries remains one of the most challenging issues in clinical surgery due to their high morbidity and mortality rates. The primary objective of this study was to evaluate the histopathology and other diagnostic outcomes of wound repair following surgical reconstruction of large experimental duodenal defects using synthetic (ePTFE, expanded polytetrafluoroethylene) or organic (JSP, jejunal serosal patch) materials. Materials and Methods: A total of 20 European rabbits were randomly divided into two equal groups (n = 10 each). A grade III defect covering over 50% of the duodenum’s circumference was created in the second part of the duodenum of the rabbits. The anesthesia, duodenal injury, postoperative care, and animal sacrifice protocols were identical for all experimental rabbits. The effectiveness of JSP and ePTFE patch repair techniques was investigated based on clinical, macroscopic, and microscopic assessments at two and four weeks postoperatively. Results: Survival rates were comparable between groups (p > 0.05). Remarkable mucosal regeneration was evident in all experimental animals by two weeks, showing complete coverage of the jejunal serosal and ePTFE patches by re-epithelialized mucosa with functional villus formation. While partial development of the underlying muscular and serosal layers was observed in both groups at four weeks, the JSP group achieved a significantly higher median histological score (19 vs. 14; p = 0.003). Conversely, the ePTFE group exhibited a major safety concern: a highly significant increase (p ≤ 0.001) in Grade 4 dense, inseparable adhesions throughout the abdominal cavity, which were entirely absent in the JSP group. Conclusions: Both JSP and ePTFE are viable for duodenal reconstruction, but the autologous JSP is superior in tissue healing and safety. Severe adhesions associated with ePTFE constitute a significant clinical concern, limiting its use to a second-line alternative. Consequently, JSP is the preferred option, while ePTFE requires further long-term safety validation.

Diabetic peristalsis disorders are common complications in diabetes mellitus type 2. Disturbance of interstitial cells of Cajal (ICC) caused by metabolic changes in diabetes could explain the symptoms of diabetic gastroenteropathy. Although heterogenous interstitial cell types represent only 5% of the cell population of the muscle layer in the gastrointestinal tract (GIT), they are important for conducting electrical signals and regulating muscle excitability. The aim of this study was to investigate the alterations of the myenteric and intramuscular ICCs in the gaster of rats with diabetes mellitus type 2 (DMT2), as well as determine their distribution in relation to smooth muscle cells and enteric nerve structures. Male Wistar rats were used and DT2 was induced by streptozotocin-nicotinamide (STZ-NA) application. The stomach specimens were exposed to type III transmembrane tyrosine kinase (c-KIT), neurofilament (NF-M) protein and desmin antibodies to investigate the ICC, enteric neurons and smooth muscle cells. Morphological changes of the cells were quantified by the numerical areal density of intramuscular ICC, the ICC score of myenteric ICC and the volume density of nerve fibers. In conclusion, a statistically significant decrease in the number of intramuscular ICC and myenteric ICC without nerve fiber loss were observed in all stomach regions in rats with STZ-NA-induced DMT2.