Monoclonal Gammapathy of Renal Significance: Morphological Variants of Lesion

The article discusses the concept of monoclonal renal gammopathy, which combines various renal diseases caused by the deposition of monoclonal immunoglobulin and / or their components in the glomeruli and tubulointerstitium. This nosological group was identified within the group of monoclonal gammopathies of undetermined significance (in 2012). The data on the study of morphological kidney damage associated with monoclonal renal gammopathy are presented. The spectrum of renal diseases in monoclonal renal gammopathy is diverse, and its classification is based on the localization of renal lesions in the glomeruli, tubules, vascular interstitium and stroma, as well as the peculiarity of the deposition of immunoglobulins (organized and unorganized). Kidney biopsy is required in most cases to locate the lesion, assess its severity, and predict patient survival. Diagnostics requires the integration of morphological changes using light microscopy, immunofluorescence, electron microscopy, and in some cases, staining of monoclonal protein for Ig isotypes is used (staining with hematoxylin / eosin, Schiff stain (PAS reaction), Jones stain, Congo Red stain, Masson’s trichromal stain). Early diagnosis and timely prescription of clone-oriented therapy by a hematologist and / or a hematooncologist can stop the progression of the malignant process and kidney malfunction. A nephrologist should monitor the patient, interacting with the hematologist.

Dynamics of changes in the structural components of the mucosa and cartilage of the larynx of rats at the end of 42 days of experimental opioid exposure and after 56 days with opioid withdrawal

In our work we aimed to study the pathomorphological manifestations among the structural components of the laryngeal mucosa and cartilage in the later stages of the experimental opioid effect. This goal was achieved through the use of histological techniques to visualize the structural components of the laryngeal mucosa and cartilage. Histological sections with a thickness of 5 -7 mm were made. Histological specimens were prepared according to conventional methods using the dye hematoxylin, eosin, azan according to the method of Heidenhain, PAS-reaction according to Mc-Manus and Alcian blue according to Steedman. Microscopic examinations and photographing of the preparations were performed using an MBI-1 microscope and a Nicon D 3100 digital camera.At the end of 42 days of experimental exposure, the epithelial layer of the epiglottis was inhomogeneously thickened, with excessive accumulation on its pharyngeal and apical part of the stratum corneum. Individual epitheliocytes of the pharyngeal part of the epiglottis underwent necrotic changes, the horny substance loosened in places. On the pharyngeal surface of the mucous membrane found a small amount of mucus with impurities of erythrocytes. Dyscirculatory processes were also registered in the animals of the experimental group. In particular, dilatation and overflow of erythrocytes of vessels of own plate of a mucous membrane of an epiglottis, and also polymorphonuclear infiltration of own plate of a mucous membrane were observed.

Restorative Processes in the Thyroid Gland of Russian Long-Haired Rams in Postnatal Ontogenesis

The aimof this study is to study the recovery processes in the thyroid gland of Russian long-haired sheep in postnatal ontogenesis.Material and methods. The material for the study was 77 rams of the Russian long-haired breed of various ages. Fragments of the thyroid gland were fixed in a 10% solution of neutral formalin, in liquids of Shtive and Buena. Thin paraffin sections with a thickness of 4–5 μm were stained with hematoxylin and eosin, azan according to Heydenhein, and the PAS-reaction was applied. The average area of all follicles in the field of view was determined at a magnification of ×80 (ob. 10; oc. 8) using G.G. Autandilov ocular grid (50 fields of viewfor each animal). Based on the obtained absolute values of the area of the follicles and the interfollicular epithelium (mm 2 ), the relative value (%) of the area of the follicles and the interfollicular epithelium was determined. Using a screw eyepiece micrometer, the diameter of the nuclei of thyrocytes in the follicles and thyrocytes of the interfollicular epithelium was measured. The area of the nuclei was determined by the diameter of the nuclei. The mitotic index (MI) in ‰ was calculated . The number of dividing cells per thousand thyrocytes was calculated. At least 20,000 cells were counted for each animal.Results.It was found that in rams aged 15 days, the area of interfollicular epithelium was 86.5%, microfollicles occupied an area of 13.5%. Dividing cells were common, with the MI of follicular and interfollicular thyrocytes being 0.19‰. In rams at the age of 2 months, the number of small follicles increased, the areaof which was 19.7%. MI in follicles increased to 0.21‰, in interfollicular epithelium it decreased to 0.16‰. In rams at the age of 4 months, the area of follicles almost doubled, the area of interfollicular epithelium decreased by 16.1%. In rams aged 2–3 years, the area of interfollicular epithelium decreased, while MI decreased and was 0.13‰ in 3-year-old animals. In rams at the age of 4 and 5 years, there was a decrease in the functional activity of thefollicles. MI in large follicles was higher than in small follicles (0.12–0.13‰ versus 0.09‰).

Histochemical Assessment of Mucin-Secreting Cells from the Gastric Mucosa of Guinea Pigs

Stomach fragments from 3 guinea pigs were collected from the three regions: cardiac, fundic and pyloric, for histochemical investigations. The anatomical segments were processed by the classical method of inclusion in paraffin and the histological sections were stained with PAS reaction for highlighting the neutral mucins and the Alcian blue method for acid mucins. All the surface cells of the gastric mucosa and in the crypts were positive on the PAS reaction and negative in the case of the alcian blue reaction. This demonstrates that cells on the surface and in the crypts synthetize neutral mucins. In the case of the cardiac region glands, only a small number of cells were positive on the two histochemical reactions, which shows that the cardiac glands in guinea pig synthesize a very small amount of neutral and acidic mucins. There are no positive cells in neither reaction used in the fundic glands case, which shows that these glands do not synthesize mucins, neither neutral nor acidic content. The glands located in the pyloric region have cells in the deep half of the wall which were positive on both histochemical reactions, which shows that they synthesize both neutral mucins and acidic mucins.

Age Dependency of Spermatogenesis Efficiency in Cats

The purpose of this study is to study the efficiency of spermatogenesis in old and young cats in various seasons of the yearMaterial and methods. The material has been collected from 16 cats of different ages in winter and summer periods in Voronezh veterinary clinics while animals being sterilized. The testicles were fixed in Shtiva’s liquid and Buen’s liquid. The material was poured into paraffin and a series of paraffin sections 4–5 μm thick were prepared. Sections were stained with hematoxylin and eosin, iron hematoxylin, Heidengain azane, trichrome-PAS reaction and tetrachrome-PAS reaction. By means of a helical eyepiece-micrometer, the diameter of the testicles tubules and the epididymis (50 measurements for each animal) were measured. To determine the effectiveness of spermatogenesis at an increase in 900 times, the number of first-order spermatocytes in the zigotene and pachitene stage, early spermatid (50 canals for each animal) was estimated. The normality of the distribution was determined using the Kolmogorov–Smirnov test and the Lilliefors adjustment. The measurement results were processed using the nonparametric Mann–Whitney U-criteria. Changes at Р<0.05 were considered statistically significant.Results. The maximum diameter of the testicular tubules and the canal of the epididymis was found in animals at two years of age. These parameters in cats at the age of 8 years are reduced by 29.2%, and by17.0%, respectively. Comparing the number of dying cells in old and young animals, it can be noted that in cats at the age of 8 years the number of dying spermatids increases, while spermatogenesis efficiency decrease is statistically significant (by 19.1%).

Pathomorphology of cats with myocardial infectious peritonitis

The article presents the results of macroscopic and microscopic examinations of myocardial cats in wet and mixed forms of FIP. A pathoanatomical study of 19 cat carcasses, aged from 3 months to 7 years, was diagnosed with infectious peritonitis during life (on the basis of anamnesis, clinical features, morphological and biochemical blood test, ultrasound, Rivalt test and FCVetx rapid test VetE.) All animals were kept at home. For the microstructural study, samples of cats' hearts were selected, which were fixed in 10% aqueous formalin neutral solution, Carnua, Buen solutions and 96 ° ethyl alcohol. Histogram sections were stained with hematoxylin and eosin staining, picrofuxin (Van Gizon), PAS reaction (McManus), methyl green pyronin (Brache), Malory, and examined under a microscope. Histological examination of the cardiac muscle of cats in various forms of infectious peritonitis revealed changes of non-inflammatory and inflammatory nature. In the exudative form, non-inflammatory processes prevailed. In the myocardium, the most severe changes occurred in the capillaries, the walls of the arterial vessels and the stroma, which were characterized by diapedic hemorrhage, mucoid and fibrinoid swelling and necrosis of the walls of the arterioles. Disorganization of connective tissue was accompanied by stratification of connective tissue fibers and impregnation of weakly oxyphilic, PAS-positive compounds of the intermuscular lumen, which was combined with dystrophic changes in cardiomyocytes. In the mixed form, proliferative-destructive vasculitis, diffuse or focal lymphoid-histiocytic infiltrates in the myocardium prevail. The revealed optical changes in the structural elements of the heart indicated a sharp weakening of the contractile function of cardiomyocytes and heart failure. In addition, it should be noted that the characteristic morphological manifestation for immunocomplex diseases is the development of vasculitis, which is preceded by fibrinoid necrosis of the walls of the arterial vessels and intensive infiltration of their circulatory elements, and these changes occurred in infectious peritonitis of cats.

Features of the expression of biomolecular markers (CD44, MMP9, TGFβ1) in assessing the effectiveness of treatment of endothelial-epithelial corneal dystrophy

The purpose was to determine the effectiveness of endothelial-epithelial dystrophy treatment with subconjunctival injection of low molecular weight hyaluronic acid.Prospective material of 14 corneas with different epithelialepithelial dystrophy forms were examined and treated. To study the morphological features of keratopathy with the background of glaucoma staining of histological preparations with hematoxylin and eosin; histochemical staining (PAS reaction, MSB,Masson,Congored; IHC with CD44, MMP9, TGFβ1 were used.According to the results obtained, in the group of patients with EED, with the background of the use of an injectable form of hyaluronic acid, the activity of inflammation decreases due to a decrease in the epithelial and stromal expression of CD44 and MMP9. The proapoptotic and profibrotic action of TGFβ1 decreases.

MICROSTRUCTURAL ANALYSIS OF FORCEMEATS OF READY-TO-COOK CHOPPED MEAT WITH FUNCTIONAL INGREDIENTS

Meat products, at different technological stages and as finished articles, retain their morphological features. Microstructure analysis of the raw material, ready-to-cook products, or finished articles allows determining the presence of certain types of tissues, organs, spices – and low-value admixtures the recipe does not provide for, as well as reused raw materials. Microstructural studies of ready-to-cook chopped meat products allows identifying their components, establishing different properties of various tissue and cellular structures, and controlling the articles manufactured. Minced beef as the object of research was modified, with 5 %, 10 %, 15 % of the meat part replaced with lupin flour and 0.5% of elecampane root powder added as aromatic raw material. For microscopic examination, samples of the forcemeats developed were put marks on and fixed in a 10 % neutral formalin solution. The sections, as thick as 0.5–1 cm, were cut on a sledge microtome. They were stained with haematoxylin and eosin, and the PAS reaction. Light microscopy and microphotography of the tissue specimens were performed with a microscope Leica DM 2500 and a camera Leica DFC 450C with the software Leica aplitation suite 4.4. The micrographic investigation of the forcemeats revealed polygonal and round muscle fibres (their dark nuclei were clearly seen under the sarcolemma), concentrations of adipose tissue histologically characterized by a reticulate structure. In the microphotographs, lupin flour looks like groups of round light purple cytoplasm with dark purple nuclei in the centre of polygonal cells; bread looks like loose brown fibres; wavy violet fibres represent onions; and single dark brown spots marked elecampane. It has been shown that histological studies, with the PAS reaction used, are helpful in determining the meat and plant content in the ready-to-cook meat developed, and that haematoxylin and eosin can help determine the functional ingredients content.

Histochemical investigation of the esophagus of the Wild bronze turkey (Meleagris gallopavo)

The aim of the present study was to investigate the thoracic part of the esophagus in the bronze turkey, using Masson’s trichrome stain and Alcian blue-PAS staining. Thirty-six clinically healthy bronze turkeys (eighteen males and eighteen females) were studied. The groups of the birds were at age 1, 7, 14, 28, 35 and 49 days. Each group consisted of three male and three female birds. The histological features of the organ were similar in the studied groups. It consisted of tunica mucosa, tunica submucosa, tunica muscularis, and tunica serosa. There were no specifics in the organ regarding the sex and the age of the birds. The esophageal glands in all of the studied groups, demonstrated intensive PAS and AB reaction, because of the mucous, produced by the epithelial glandular cells. Lamina propria exhibited a weak PAS reaction, visible in all ages, either in males, either in females.