Tissue Capsule Research Articles

Peri-Implantation Targeting Using Modified Adenoviral Vectors

The aim was to conduct a comparative morphological analysis of the effect of implantation and modified adenovirus Ad 5/3 on the efficiency of local gene delivery to cells of the peri-implantation niche in vivo. Material and methods. The experiments were carried out on laboratory rats, which were implanted with collagen membranes for a period of 2 weeks. Three and seven days after the introduction of adenoviruses (wt, Ad 5/3), the tissues were fixed for histological examination and analysis of transduced cells by in situ PCR. Results. The results showed that the presence of a collagen implant improved the biodistribution of viral particles, and the modification of Ad 5/3 significantly increased the efficiency of transduction of fibroblasts and macrophages in the peri-implantation zone. In the absence of an implant, the transduction efficiency decreased for both types of adenoviruses. Morphometric analysis revealed that the main transduced cells were fibroblasts of the connective tissue capsule surrounding the implant. Conclusion. Based on comparative morphological and molecular biological studies, an optimal protocol for local gene delivery using adenoviral vectors for peri-implantation targeting was determined. The effect of adenovirus modification on the tropism and efficiency of gene delivery to the cellular components of the PIN was characterized, and it was found that Ad 5/3 significantly exceeds AD wt in these parameters. The development and further application of the peri-implantation targeting method proposed by us can ensure local, effective and safe gene delivery, which will significantly expand the indications for gene therapy and its availability to doctors and patients. In addition, this method can be adapted for use in various organs and for various diseases.

Structural changes of muscle spindles in the multifidus muscle after intervertebral disk injury are resolved by targeted muscle activation.

Fibrosis of muscle spindles (sensory organs) in back muscles induced by intervertebral disc (IVD) degeneration could limit transmission of muscle stretch to the sensory receptor and explain the proprioceptive deficits common in back pain. Exercise reduces back muscles fibrosis. This study investigated whether targeted muscle activation via neurostimulation reverses or resolves muscle spindle fibrosis in a model of IVD injury. In eighteen sheep, lumbar (L)1-2 and L3-4 IVD degeneration was induced by partial thickness anulus fibrosis incision and a neurostimulator was implanted. After IVD-degeneration developed for 3 months, neurostimulation of the L2 nerve root activated multifidus in nine randomly selected animals. Multifidus muscle adjacent to the spinous process of L2 (non-stimulated) and L4 (stimulated) was harvested 3 months after activation. Muscle spindles were identified in Van Giessen's-stained sections. Connective tissue spindle capsule thickness, and cross-sectional area (CSA) of the spindle, its periaxial fluid and sensory elements were measured. Immunofluorescence assays evaluated Collagen-I and -III. Multifidus muscle spindle capsule thickness and Collagen-1 were significantly less in the neurostimulation animals than IVD-injury animals at L4 (stimulated muscle) (P < 0.05), but not L2 (non-stimulated muscle). Spindle capsule thickness was less in lateral than medial regions. CSA of the muscle spindle and sensory elements was less in neurostimulated animals at L4. Targeted multifidus activation reverses or prevents accumulation of connective tissue of the multifidus muscle spindle capsule caused by IVD injury. Reduced fibrosis should maintain sensory function of this important muscle mechanoreceptor and might provide an effective solution to resolve the commonly identified proprioceptive deficits in back pain and maintain healthy spine function.

ВЛИЯНИЕ ПРЕПАРАТА ОМНИК НА ИНТЕНСИВНОСТЬ КЛЕТОЧНЫХ РЕАКЦИЙ В ОЧАГЕ ЭКСПЕРИМЕНТАЛЬНОГО ВОСПАЛЕНИЯ

Relevance. The effect of the drug Omnic (Tamsulosin) reduces the tone of the smooth muscles of the prostate gland, bladder neck, prostatic part of the urethra, improves urine flow, reduces the symptoms of obstruction and irritation of the urinary tract in benign prostatic hypertrophy. However, there are no data on its anti-inflammatory effect. Objective. To determine the mechanisms of the anti-inflammatory effect of the drug Omnic on the model of purulent inflammation in rats. Material and methods. The study was conducted on 50 outbred white male rats divided into 2 series: Series 1 - control (they were implanted with diffusion chambers filled with an aqueous suspension of a one-day culture of staphylococcus aureus under the skin of the thigh; Series 2 - experimental (the animals of this series were modeled with purulent inflammation similar to the control, but from the 1st day of inflammation, the rats were injected intramuscularly with 0.02 ml of the Omnic preparation for 10 days). The materials were collected 2, 3, 5, 7, 10, 15, 20, 30, 60 days after implantation. The material was fixed in a 10 % solution of neutral formalin. In the peripheral zone of the inflammation focus, the state of the microvessels was qualitatively assessed, the concentration of mast cells, eosinophils, neutrophils, mononuclear cells and poorly differentiated fibroblasts was counted. Results. After 48 Hours after the onset of inflammation, a cellular wall with a thickness of 313.18 ± 30.19 μm is observed around the chamber wall. Three days after the introduction of the chambers, the thickness of the leukocyte wall remains the same and is 334.38 ± 25.69 μm. Five days after the onset of inflammation, the thickness of the leukocyte wall decreases sharply compared to the previous period and is 157.86 ± 46.08 μm. Seven days after the introduction of the chambers, the thickness of the cellular wall increases to 220 ± 29.67 μm. On the 10th day from the onset of inflammation, the thickness of the wall decreases to 129.52 ± 21.01 μm. On the 15th day of inflammation, the thickness and condition of the leukocyte wall do not change. On days 20-30-60 from the moment of implantation of the chambers, the remains of the leukocyte shaft with a thickness of 117.86 ± 29.6 μm were observed around them. Conclusion. The effect of Omnic on the dynamics of cellular reactions in the inflammation focus enhances the migration capacity of leukocytes, concentrates fibroblasts around the leukocyte shaft. At the same time, the synthesis of collagen by fibroblasts does not correspond to the thickness of the connective tissue capsule, which disrupts the maturation process of the capsule. Presumably, the action of Omnic is associated with the effect of the drug on the tone of capillaries and venules

REGULARITIES OF DEVELOPMENT AND FORMATION OF EMBRYOTOPOGRAPHY OF THE THYROID AND PARATHYROID GLANDS IN HUMAN EMBRYOS OF 7-9 WEEKS OF GESTATION

The article describes the peculiarities of development and formation of variants of external shape and localization of thyroid and parathyroid glands in human embryos of 7-9 weeks of gestation.Aim of the study. The objective of the study was to fi nd the regularities of development and formation of embryotopographic relations between the thyroid and parathyroid glands during 7-9 weeks of the human intrauterine development. Material and methods. The study was carried out using a complex of morphological methods on 42 samples of human embryos without external signs of anatomical deviations or developmental defects. The specimens were taken from the museums of the Department of Human Anatomy of M. H. Turkevytch and the Department of Anatomy, Clinical Anatomy and Operative Surgery of the Bukovinian State Medical University.Results and discussion. In embryos with parietococcygeal length (PCL) of 14,0-17,0 mm intensive organogenesis processes of thyroid gland occur: separation of gland lobes, loss of connection with aortic arch and establishment of close correlations with laryngeal rudiment and vagus nerves. Therefore, the thyroid gland becomes semicircular. In embryos with 18,0-24,0 mm PCL there is a separation of the isthmus from the lateral lobes of the thyroid. Initially it is caused by intensive growth of the cricoid arch. Gradually the gland becomes H-shaped and fragmentation of the caudal part of the thyroglossal duct occurs. When the PCL reaches 29.5-31.0 mm, folliculogenesis begins and the thyroid gland becomes horseshoe- shaped. 9-week embryos show clear individual variations in the external shape of the thyroid gland: semicircular, H-shaped, and horseshoe. Areas of undiff erentiated epithelial tissue are found in the thyroid parenchyma, especially in its center.Conclusions. The conducted study has shown that during the 7-9 weeks of intrauterine development the structural organization of the thyroid and parathyroid rudiments becomes more complicated. Tight embryotopographic relations are established between them. Vascularization intensifi es and the connective tissue capsules of the thyroid and parathyroid glands are formed. At the same time their linear dimensions increase rapidly.

Giant pelvic dermoid cyst in a 17-year-old girl

BACKGROUND: Dermoid cysts in the presacral and retrorectal space in children are relatively rare. However, even more rarely, they have clinical manifestations at patient’s early age and so, can be silent for a long time. CLINICAL CASE DESCRIPTION: The article describes a rare clinical observation — a giant dermoid cyst in the retrorectal space in a 17-year-old girl. The child had a tendency to constipation from her early childhood. Menses started at age 13, painful. During the last year, disorders in her menstrual cycle were noticed. The girl was examined by a gynecologist. Ultrasound examination revealed a cystic formation in the pelvic cavity up to 9 cm in diameter. Non-malignant nature of the process was confirmed by: normal level of cancer markers (α-fetoprotein, β-human chorionic gonadotropin), single node, clearly defined formation capsule, homogeneous nature of its contents, no invasive growth and lesions in the regional lymph nodes. Magnetic resonance imaging with intravenous contrasting defined a true relationship of the cystic formation with other organs and structures of the pelvic cavity. The cystic formation caused deformation of the cervix, vagina, and rectum. The obtained findings allowed to plan surgical intervention correctly. Surgical access-transverse in the coccyx projection up to 10 cm long. The cystic formation was a thin-walled connective tissue capsule with a yellowish content. Due to very large cyst dimensions, first it was opened in a limited area and emptied. Then the capsule was isolated and completely removed. The cyst intimately adhere to rectum, vagina, and cervix walls. Histological conclusion: "Capsule of a dermoid cyst with hemorrhages". The postoperative period was smooth. The patient recovered, all disease manifestations disappeared. She was discharged home in a satisfactory state. Follow-up visits were in 6 and 12 months after surgery. No evidence of possible relapse. CONCLUSION: There are only few descriptions of such cases in the available literature. Ultrasound and MRI examinations allowed to have a full picture of dermoid cyst position and its connection with other pelvic organs due to which surgeons could develop a correct plan for surgical intervention.

Biological testing of titanium-containing implants with noble metal coatings in an in vivo experiment

The aim of study is to conduct in vivo biological testing of titanium nickelide samples modifed with Ag/Pt or AuAg/Pt flm heterostructures in comparison with the bare carrier.Material and Methods. Titanium nickelide plates modifed with flm heterostructures made of noble metals and the laboratory mini-pigs used for in vivo tests were the objects of the study. To form flm structures on titanium nickelide samples, the physical gasphase deposition methods: ion plasma deposition (IPD) and thermal (PVD) sputtering were used. The Ag/ Pt or AuAg/Pt heterostructures were characterized by X-ray diffraction and scanning microscopy methods.Results. The biocompatibility of implants before (TiNi, control) and after (Ag/Pt/TiNi and AuAg/Pt/TiNi) modifcation with flm heterostructures was tested in in-vivo experiments on a laboratory animal (mini-pig). General toxic reactions of the body to the injected samples were absent. A comparative macroscopic and histological analysis of the condition of peri-implant tissues after 39 days of implantation was performed. The connective tissue capsule around the TiNi sample revealed the presence of a certain number of lymphocytes, eosinophils and macrophages, but these indicators decrease in the order of TiNi &gt; AuAg/Pt/TiNi &gt; Ag/Pt/TiNi.Conclusion. The positive effect of modifying the titanium nickelide surfaces with noble metal heterostructures on the biocompatibility of metal implants was demonstrated in an in vivo experiment.

Effects of Losartan and Fisetin on Microfracture-Mediated Cartilage Repair of Ankle Cartilage in a Rabbit Model

Background: Microfracture is one surgical treatment strategy for osteochondral lesions of the talus (OLTs) but results in fibrocartilage repair tissue, which has inferior mechanical properties to native hyaline cartilage. Biological regulation of microfracture has been suggested to improve the quality of cartilage repair in patients. Purpose: To determine if administration of losartan, fisetin, or losartan and fisetin combined can enhance microfracture-mediated cartilage repair of OLTs in a rabbit model. Study Design: Controlled laboratory study. Methods: Four-month-old female rabbits were divided into the following groups (8 rabbits per group): microfracture only (microfracture), microfracture plus losartan (losartan), microfracture plus fisetin (fisetin), and microfracture plus losartan and fisetin (losartan+fisetin). A 2.7-mm osteochondral defect and 4 microfracture holes were created in the talar dome cartilage. The rabbits were administered losartan (10 mg/kg/day), fisetin (20 mg/kg/day), or losartan and fisetin orally until euthanized 12 weeks after surgery. Gross evaluation, micro–computed tomography, histology, and immunohistochemistry evaluations of the osteochondral defects were performed as well as quantitative polymerase chain reaction of capsule tissue and enzyme-linked immunosorbent assay of serum. Results: The losartan and fisetin groups had increased International Cartilage Regeneration & Joint Preservation Society macroscopic scores with improved cartilage repair and enhanced subchondral bone healing compared with the microfracture group. However, the losartan+fisetin group did not show a synergistic effect. O’Driscoll histology scores were higher in the losartan and fisetin groups compared with the microfracture group, while the losartan+fisetin group had a lower score than the losartan, fisetin, and microfracture groups. Collagen type 2 staining revealed organized chondrocytes in the losartan and fisetin groups, but the losartan+fisetin group did not show improvement when compared with other groups. Fisetin treatment decreased catalase and transforming growth factor-β1–activated kinase 1 expression in capsular tissue. Conclusion: Concomitant microfracture and biological regulation, using oral administration of either losartan or fisetin, may improve cartilage healing of OLTs; however, losartan and fisetin combined in the current drug administration regimen does not appear to provide synergistic effects. Clinical Relevance: Oral intake of losartan or fisetin may result in beneficial effects on microfracture-mediated cartilage repair of OLTs.

ОСОБЕННОСТИ РЕПАРАТИВНОЙ РЕГЕНЕРАЦИИ КОСТНОЙ ТКАНИ В ЗОНЕ ИМПЛАНТАЦИИ «БАК-1000» В КОМБИНАЦИИ С АНГИОСТИМУЛИРОВАННЫМИ МСК

An urgent problem in modern maxillofacial surgery remains the question of choosing the optimal osteoplastic material when eliminating diastasis of bone tissue, especially when replacing large defects. An active search and testing of new biocomposites that stimulate osteohistogenesis continues, assessing their effectiveness and safety. Aim of the study: characteristics of osteoregeneration after implantation of “BAK-1000” in combination with MSCs stimulated in the angiogenic direction in an experiment. Materials and methods. Experimental animals (Sprague Dawley rats, age 13–15 weeks, n = 30, ♂) in this study were randomly divided into two groups – control and experimental (15 animals in each). The first stage of the experiment is the cultivation of mesenchymal stem cells, the second is the creation and filling of bone defects using implantation material and autologous MSCs. Results. A histochemical study two months after implantation of the biocomposite in combination with MSCs revealed moderate development of signs of osteohistogenesis, pronounced neoangiogenesis and the formation of bright yellow crystals. Administration of BAC-1000 to animals in the control group demonstrated the formation of a connective tissue capsule around the implanted material with virtually no signs of osteohistogenesis and neoangiogenesis. Conclusions. In the experiment, the use of a biocomposite consisting of “BAK-1000” in combination with angiostimulated MSCs was tested. Based on a histochemical study, it was noted that it is ineffective in closing extensive bone tissue defects, however, additional cultivation of these cells on a matrix of osteoplastic materials can enhance the processes of osteohistogenesis and neoangiogenesis, inducing bone tissue metabolism and stimulating the formation of connective tissue in the diastasis zone, which may be the reason for further studies of such combinations.

Breast implant-associated anaplastic large cell lymphoma.

Breast implant-associated anaplastic large cell lymphoma is a subtype of non-Hodgkin's lymphoma that can occur around the surface of textured breast implants or in patients who have previously had textured breast implants. The condition should be suspected in cases of late-onset breast asymmetry and seroma formation around a breast implant. If the implant and surrounding connective tissue capsule is removed, the prognosis is usually very good. The purpose of this clinical review article is to provide a brief overview of the diagnosis and treatment of breast implant-associated anaplastic large cell lymphoma.

Immune cells and tryptophan metabolism in the joint capsule tissue in rheumatoid arthritis

To the present day, many links in the pathogenesis of rheumatoid arthritis remain unclear, which leads to unsatisfactory results in its therapy.The aim. To study the cells involved in immune reactions and tryptophan metabolites in the joint capsule in rheumatoid arthritis.Materials and methods. The experiments were carried out on 40 Wistar rats. Rheumatoid arthritis was induced by intraperitoneal injection of a solution of type 2 collagen (Chondrex Inc., USA) in incomplete Freund’s adjuvant. On the days 7, 14 and 21, the content of tryptophan, kynurenine, 3-hydrokenurinine, L-5-hydrotryptophan in the joint capsule was determined using high-performance liquid chromatography. Cells with CD3, CD20 and CD68 in joint tissues were studied at the same time using the streptavidin-biotin-peroxidase method. We used enzyme-linked immunosorbent method to determine antibodies to citrulline-containing peptide. Statistical analysis was performed using the Jamovi, version 2.3 software.Results. The content of cells carrying CD3, CD20 and CD68 markers in the joint was high in experimental rheumatoid arthritis. In joint tissues, the content of tryptophan metabolites along the kynurenine pathway also increases and the concentration of metabolites along the serotonin pathway decreases. Direct positive correlations of cells carrying CD3, CD20 and CD68 differential clusters with the content of tryptophan metabolites along the kynurenine pathway and negative correlations with metabolites of the serotonin pathway were established.Conclusions. Cells carrying CD3, CD20 and CD68 markers and tryptophan metabolites – kynurenine and L-5-hydrotryptophan – play an important role in the pathogenesis of rheumatoid arthritis.

Histological Study of Development Structure of Testis and Epididymis in Gazelle Gazelle Subgutturosa

Objective: The aim of this study for focused the light on the development structure of the testis of gazelle. Materials and Method: 10 healthy male gazelle were used to study the histology structure of testis (5 pre- Puberty and 5 post- Puberty). Results: The testis is surrounded by a thick, irregular connective tissue capsule. Each lobule of the testis is composed of seminiferous tubules and interstitial tissue, and trabecular and interlobular septa divide the lobules apart. Neighboring the seminiferous tubules are Sertoli cells and spermatogenic cells. From spermatogenic cells, spermatozoa are produced. The first spermatogonia are small, spherical cells with black, spherical nuclei that reside on the basement membrane. Spermatogonia were earliest stages of the spermatogenic cells. Larger cells with frequently distinct chromatin are called primary spermatocytes. Secondary spermatocytes are rare because of their quick second meiotic division and the haploid spermatids that follow. Spermatids are round, pale-nucleated cells that are grouped close to the lumen of the seminiferous tubule. Prostatogenic cells outnumber Sertoli cells in the body. Oval or triangular in shape, the nucleus has a light coloration. In the connective tissue separating adjacent tubules, Leydig cells are present. Lines the epididymis are pseudostratified epithelium. Extensions of the cytoplasm into the lumen are called stereocilia. In different proportions, there is circular smooth muscle, and a connective tissue lamina propria supports the epithelium. The rete testis is connected to the ductus epididymidis by the efferent ductules, which are convolutions of tubules. Numerous valved veins were visible in the tunica albuginea, which covered the initial ascending portion of the epididymal head. Cuboidal epithelium was lining extratesticular rete testis. Three different cell types; migrating, basal, and columnar had epithelial membranes lining the efferent ductules. Many columnar, non-ciliated cells with many cytoplasmic vacuoles and tiny granules lined the epithelium of the first segment of the efferent ductules. Conclusion: In post-puberty age, the structure of the gazelle's testis exhibited a pattern resembling that of other ruminants; the seminiferous tubules contain adult sperm and a broad lumen.

Features of relationship between &lt;i&gt;Myxobolus pronini&lt;/i&gt; Liu et al., 2016 (Cnidaria: Myxozoa) and the Gibel carp (&lt;i&gt;Carassius auratus gibelio&lt;/i&gt;)

Histological description of the location sites of Myxobolus pronini in the gibel carp (Carassius auratus gibelio) is given, together with the analysis of host-parasite relations. It was revealed that large spore masses surrounded by a connective tissue capsule are found in the body cavity. The development of vegetative forms of M. pronini begins in the exocrine tissue of the pancreas of the Prussian carp.

Remodeling of the structural components of the capsule and glomerular zone of the adrenal glands cortex of white rats under the influence of a complex of food additives at the late terms of the experimental study

With food additives, we can add flavour to food, extend its shelf life, and make it look good. However, even small amounts of these additives can lead to diseases of various organs and systems. The aim of our work is to establish metrics and morphological changes in the structure of the capsule and the glomerular zone of the cortex of the adrenal glands of rats at the later stages of the experimental study under the conditions of consumption of a complex of food additives: monosodium glutamate, sodium nitrite and Ponceau 4R. The control group of rats consumed oral drinking water and saline. The rats of the experimental groups were orally administered once a day with a 10 % solution of sodium nitrite (E250), sodium glutamate (E621) or Ponceau 4R. The dosages of food additives were two times lower than the permissible norm in food. The rats were withdrawn from the experiment after 8, 12 and 16 weeks. The adrenal glands were removed for the study. Paraffin sections were stained with hematoxylin and eosin, and semi-thin sections with toluidine blue, and examined using a light microscope Biorex with a digital microphoto attachment DSM 900. Ultrathin sections were examined in a TEM-125 K electron microscope. For morphometric analysis, the structure of the capsule and the glomerular zone of the cortex of the adrenal glands of rats at the later stages of the experimental study was studied. The study results were analysed using the software package “InStat”. At the late stages of the experimental study, the adrenal capsule underwent irreversible changes. The average thickness of the adrenal connective tissue capsule decreased by the end of the 16th week of the experimental research. Similarly, the average thickness of the cortex decreased with each subsequent week relative to the control values, indicating significant structural and functional disorders. The average thickness of the glomerular zone of the adrenal cortex periodically changed as a compensatory reaction in response to the administration of a complex of food additives to rats. The phenomena of nucleus pyknosis and sludge syndrome were detected, which indicated compensatory and adaptive processes at the microscopic level. The analysis of electron micrographs revealed destroyed granular endoplasmic reticulum cisternae and mitochondrial remnants. Thus, it has been established that using a complex of food additives (monosodium glutamate, sodium nitrite and Ponceau 4R) directly affects the adrenal glands of rats. This effect causes structural changes in the cortex and medulla, causing alteration and hypertrophy of cells in these areas. Additionally, hyperhydration of the connective tissue stroma and compensatory-restorative reactions aimed at transcription factors and internal mechanisms of nitric oxide formation were recorded.

PSV-28 Liver abscess microbiota of beef cattle administered in-feed tylosin differ according to abscess size and fraction

Abstract Liver abscesses (LA) pose a significant challenge to the Canadian beef industry as they are estimated to cost the industry ~ $61.2 million annually. This is likely an underestimate as it does not account for losses in animal productivity. Tylosin phosphate is widely used to reduce LA, but concerns over antimicrobial use selecting for antimicrobial resistance has created an urgency to explore alternative approaches. Understanding the impact of tylosin on the microbial ecology of LA is crucial to this. We hypothesized that altering the duration of in-feed administration of tylosin to feedlot cattle would alter the microbial community of LA. To investigate this, we collected abscessed livers from cattle fed a diet containing tylosin 1) throughout finishing, 2) during the first 78% of the feeding or 3) during the last 75% of the feeding period. We examined LA microbial ecology of purulent material, abscess capsule tissue, originating from abscesses of different sizes using a metataxonomic approach. Our findings revealed that shortening tylosin administration did not notably alter the alpha (P &amp;gt; 0.05) or beta-diversity (P &amp;gt; 0.05) of LA microbial communities. There was a significant difference in microbial richness associated with abscess capsule (P &amp;lt; 0.05) compared with bulk purulent material. Fusobacterium or Bacteroides ASVs dominated LA microbiomes, alongside probable opportunistic gut pathogens and other bacteria. Interestingly, classifying samples based on whether they originated from a liver with a single abscess, multiple abscesses or a very large abscess tended to differ in microbiome composition (P = 0.06). These insights contribute to our understanding of factors impacting liver abscess microbial ecology and will be valuable in identifying antibiotic alternatives. They underscore the importance of exploring varied approaches to address liver abscesses while reducing reliance on in-feed antibiotics.

Morphological Changes in Tissue When Using Polypropylene Implants with Adsorbed Multipotent Stromal Cells in Experiment.

The subcutaneous tissue of rats after implantation of polypropylene materials with adsorbed bone marrow-derived mesenchymal multipotent stromal cells (MMSCs) was studied using light microscopy. Inflammation in response to implantation was mild, and the foreign material was encapsulated into a thin strip of dense fibrous connective tissue with multinucleated macrophages. By 1 year after introduction of the monofilament and 6 and 12 months after implantation of the mesh product, some threads were deformed, broken, and had sharp edges. Small fragments of foreign material appeared in the adjacent tissues surrounded by their own relatively thick acellular capsule. As a result of preliminary adsorption of MMSCs on polypropylene, the thickness of the connective tissue capsule decreased, its vascularization increased, and the severity of inflammatory infiltration decreased. However, all effects of MMSCs adsorption in rats were transient and disappeared within 1 week.

Pathological and Parasitological Findings in Serbian Great Cormorants Infected by Contracoecum rudolphii Sensu Lato

Abstract The carcasses of ten great cormorants (Phalacrocorax carbo) found in one colony in the province of Vojvodina were necropsied and examined for parasites. The study aimed to identify helminths and histopathologically evaluate the associated tissue damage. Numerous nematodes were observed, either free in the the lumen of the ventriculus or deeply embedded in the ventricular mucosa of all the cormorants examined. The collected parasite samples were morphologically identified as Contracaecum rudolphii sensu lato. The main pathological findings included a thickening of the ventricular wall, while histopathology revealed a mild inflammatory infiltrate in the adjacent tissue and a connective tissue capsule around the parasite. Given that the parasites in this bird species still need to be thoroughly studied in our country, particularly the pathomorphological changes they cause, this study represents the first attempt to obtain a comprehensive understanding picture of the nematode infection and the pathological changes resulting from the presence of this parasite.

A HISTOMORPHOLOGY OF THE ONE HUMPED CAMEL (Camelus dromedarius) THYROID GLAND.

An anatomical study involving the thyroid glands of 15 healthy camels (Camelus dromedarius) of different sex group A (Males) and group B (Females), were investigated under for gross and microscopic anatomy. Gross studies revealed that thyroid glands were located in between the third ring of trachea and the laryngopharynx portion of the pharynx and had two lobes, connected by an isthmus. They appeared to be reddish brown in colour. The values of weight, length, width and diameter of thyroid glands were show no significant difference between the groups (P&gt;0.05). Histological observation revealed that the thyroid gland consisted of a connective tissue capsule and trabeculae were found extending from the capsule into the substance of the gland, which divided it into lobules. Each lobule consisted of two sized follicles in variable numbers, the large and small. The large follicles were lined by low cuboidal epithelium, while the small follicles were lined by high cuboidal to columnar epithelium. The follicles had colloid material in their lumen, probably an apocrine secretion from the lining epithelial cells. There was no evidence of Parafollicular or C-cells in thyroid glands of camel.

Evidence of striking morphological similarity and tissue tropism of phylogenetically distant myxozoan genera: Myxidium and Paramyxidium in the kidney of the European eel.

European eel, Anguilla anguilla (Linnaeus) (Elopomorpha: Anguilliformes), is a critically endangered fish of ecological and economic importance, hosting numerous parasites, including myxozoans (Cnidaria). Since its initial discovery in the kidney of European eel, Myxidium giardi Cépède, 1906 has been reported with numerous spore sizes and shapes from various tissues of multiple anguillid species. Morphological variability, wide host and tissue spectrum, and lack of sequence data raised doubts about the conspecificity of reported isolates. Subsequent studies provided 18S rDNA sequences of several isolates from anguillids and other elopiform fish, and demonstrated a split of parasite data into two distinct phylogenetic lineages, one comprising the M. giardi sequence, and the other all species infecting elopiform fishes classified under the recently established genus Paramyxidium Freeman et Kristmundsson, 2018. Myxidium giardi was, however, transferred to this genus as Paramyxidium giardi n. comb. and designated as the type species of the genus. In line with this change, the sequence originally identified as M. giardi was considered to have been incorrectly associated with this species. To shed light on the status of M. giardi originally described by Cépède (1906), we conducted microscopic and molecular examinations of various organs of 24 individuals of European eel, originating from diverse Czech habitats. Through morphometric and molecular analyses, we demonstrated that spore and polar capsule morphology, morphometry and tissue tropism of our European eel kidney parasite isolates matched the features of the original M. giardi description. Our isolates clustered in the lineage encompassing the first published M. giardi sequence. Thus, the originally described M. giardi indeed represents an existing species within the genus Myxidium Bütschli, 1882, which we formally resurrect and redescribe. Due to the morphological and molecular differences between M. giardi and P. giardi of Freeman et Kristmundsson (2018), we additionally rename the latter species as Paramyxidium freemani nom. nov.

Histopathologic changes in different organs during mycobacteriosis in guppy (Poecilia reticulata) and japanese medaka (Oryzias latipes)

Total histological sections of laboratory fish Poecilia reticulata and Oryzias latipes with pronounced multiple organ failure caused by Mycobacterium infection (Mycobacterium sp.) were analyzed. The pathogenesis of the disease in question is expressed in the occurrence, in various tissues, of foci of inflammation, subsequently forming a connective tissue capsule — granuloma. These lesions were observed in almost all organs of the abdominal cavity of the fish. The largest and most common lesions were found in the pancreas, kidneys and liver (from 478.6 microns to 858.4 microns), significantly disrupting organ functions, which is a clinical picture characteristic of mycobacteriosis. The occurrence of granulomas and their average sizes in organs such as the intestine and gills were significantly lower and amounted to 328.3 and 468.9 microns, respectively. Data on the stages of granuloma development in different organs of fish are presented. The initial stage of granuloma development consists of clusters of macrophage-like cells, lymphocytes, granulocytes and a small number of cellular residues. At the final stage of development, it is a focus, including an eosinophilic-stained caseous-necrotic nucleus and a shell consisting of epithelioid macrophages. It is shown that there is a relationship between the size parameters of granulomas, the frequency of their occurrence and the degree of organ damage. The localization of granulomas and the degree of their development in guppies and medaka were similar, indicating the absence of species-specific virulence. It follows from this that any warm-water fish species cultivated under controlled conditions are at risk. This requires monitoring for signs of disease and regular preventive measures.

Dasyrhynchus giganteus plerocercoids encysting in the musculature of Indian halibut (Psettodes erumei): seasonal prevalence, morpho-molecular characterization, and histopathological alterations

This study investigated the prevalence, morphology, molecular identification, and histopathological effects of larval tapeworms (plerocercoids) infecting the skeletal muscles of the Indian halibut (Psettodes erumei) collected from the coastal waters of the Arabian Gulf. Numerous oval or round blastocysts, measuring 13–26 mm, were found embedded within the muscular tissues of the Indian halibut, rendering the fish unsuitable for human consumption. Morphological and molecular analyses identified the plerocercoids as Dasyrhynchus giganteus (family Dasyrhynchidae), with an overall prevalence of 15.4%. The seasonal prevalence was the highest in summer (14.6%), followed by spring (10.6%), winter (4.4%), and autumn (3.5%). Infection rates increased with fish size. Histopathological examination revealed fibrous connective tissue capsules surrounding the larvae, causing muscular atrophy and degenerative changes, with few inflammatory eosinophilic cells. Molecular and phylogenetic analysis of the 28S rDNA gene sequences confirmed the specimens as D. giganteus, clustered closely with other sequences of D. giganteus with 100% bootstrap values. This study provided valuable insights into the parasitic infection dynamics, seasonal variation, molecular identification, and histopathological effects, highlighting the importance of monitoring fish for food safety and public health implications.