Objective: To demonstrate the capabilities of cluster analysis in receiving scientific innovation results in morphological studies of cells of the bladder urothelium.Materials and methods.10 Wistar rats were used. Histological sections were stained with hematoxylin and eosin; electron microscope studies were  conducted; morphometry was performed in ImageJ and statistics – in studio-R using nonparametric methods and multivariate statistics.Results. A brief description of the main stages of cluster analysis shows way to determine the most important features of uroteliocytes and to reveal their heterogeneity, algorithms of Euclidean metrics and methods of clustering were described, the features of the application of the analysis in morphological studies were presented, an example of using these methods in searching for new results was presented, the models of morphological substantiation of clustering results were showed. Conclusion: 1) cluster analysis provides a scientific novelty in studies of transitional epithelium of the bladder; 2) it is used in case of heterogeneity of cellular composition of urothelium that is detected with a help of coefficient of variation; 3) the most significant features of uroteliocytes are their cell area and their nuclei area; 4) new results on the number of clusters were obtained by method of Ward, and new data on their indicators – by k-means; 5) Euclidean metric is the best to use; 6) to assess the adequacy of the results pairwise comparisons between multiple clusters were carried out according to their indicators; 7) results are presented in dimentional projection and they characterize cellular composition of the urothelium as structural system and detect systemic effects.

Objective: To give histologic, morphometric and ultrastructural characteristics of intraorganic hemovessels of the urinary bladder of rats at the stages of streptozotocin diabetes. Material and methods. There were used 70 Wistar male rats; diabetes mellitus was modeled with streptozotocin (60 mg / kg of body weight); material was taken on 14, 28, 42, 56 and 70-th day of experiment; histological, morphometric and electron microscopic research was performed. Results The microscopic, morphometric and ultrastructural peculiarities of transformation of intraorganic blood vessels of rats’ bladder during streptozotocin diabetes were detected. Conclusions: 1) the bladder diabetic microangiopathy is nonspecific process, the specificity of which is determined by the degree of expressiveness of vascular disorders which are characterized by these: a) the change of arteriolar vascular tone manifesting itself initially by dilatation, then by decrease of the lumen, then by secondary expansion; b) reconstruction of hemocapillar basal membrane, which becomes thicker 3.22-fold by the end of the experiment, disorganized and lamellar; c) blood rheological disturbances expressed in sludges in particular venules on the 14th day of experiment, on the 28th – in most venules, on the 42nd – also in capillaries, on the 56-70-th  generalized sludge syndrome of all bladder layers appears; 2) diabetic angiopathy is accompanied with swelling of different genesis: interstitial one increases till the 28th day of experiment, since the 42nd  it decreases; since the 42nd day plasma percolation of perivascular connective tissue increases; swelling of endotheliocytes appears on the 28-42th day of diabetes.

During the experiment on 70 adult male rats of the Wistar line the priority mechanisms of development of streptotrozotocin diabetic cystopathy were determined. It’s morphometrically and statistically proved that the imbalance of the systemic mechanisms of the functioning of the transitional epithelium of the bladder  starts from the first stages of the development of diabetic cystopathy and is not restored to the end of the experiment; it is associated with a violation of the structural and functional balance between the uroletocytes of clusters 4 and 1 and clusters 2 and 3, as well as with a loss of urothelial bladder of morphological stratification.The general pathological processes accompanying the diabetic cystopathy of a bladder development were revealed. According to the results of histological, morphometric, ultrastructural methods, biochemical studies of blood and urine, determination of water balance and cluster analysis, the main systemic and non-systemic factors that cause the development of these pathological processes were established.