Pathomorphological Changes in the Skin of the Guinea Pigs in the Course of Microspores

Abstract

During the course of microspores on the skin, the balance between the species of saprophytic microorganisms and hypersensitivity as an integral part of the inflammatory reaction resulting from the presence of the pathogen in the skin is disturbed. The degree of expression of inflammation varies. Clinical manifestations of microsporia are manifested by erythema, alopecia, scaly and crust formation. The aim. Histological studies were performed to determine pathomorphological changes in the skin of guinea pigs during microsporia. The studies were conducted on clinically healthy and sick guinea pigs during the acute course of the disease, during regeneration and during recovery.And also carry out a description and characterization of the identified changes in the skin.The obtained research results showed that patients with microsporia had changes in the morphological composition of the skin, which were characterized by thickening and keratinization of the epidermis, there were small-focal polymorphic cell infiltrates, there was a violation of the microvasculature and the formation of micellar formations. Materials and methods. The material for histological examination(pieces of guinea pig skin) was fixed in a 10–12 % cooled solution of neutral formalin, followed by pouring into paraffin according to the scheme proposed by G.A. Merkulov (1969). Histomic sections 5–7 μm thick were made on the MC-2 dome microtome. Hematoxylin and eosin staining were used for the morphological evaluation of cells and tissue. Microscopy was performed using an OLIMPUS CX-41 microscope. Results. Signs of superficial inflammation with hyperkeratosis and desquamation of cells of the stratified epithelium, microcracks of the epidermis were found in the skin of the patient with microsporia of the tentacle during the acute course. Signs of inflammation of the follicles and surrounding tissues are visualized. Round-cell and plasma connective tissue infiltrates of the connective tissue of the skin were detected by lymphoid, histiocytic and other cellular elements. There is moderate leukocyte infiltration in the dermis. Signs of inflammation by type of infiltration around the hair follicles, enlargement of the blood capillaries and the presence of microabscesses. In the stage of regeneration during recovery, a clear contoured layer of epithelial cells is established. There are no signs of inflammatory reaction in the dermis. Conclusion. In microspores, inflammatory processes occur in all layers of the skin. The skin of sick animals loses its barrier function due to pathomorphological changes. The long-term consequences of the pathological process during the course of microspores can provoke the development of chronic dermatitis with scleroderma. During the course of microspores on the skin, the balance between the species of saprophytic microorganisms and hypersensitivity as an integral part of the inflammatory reaction resulting from the presence of the pathogen in the skin is disturbed. The degree of expression of inflammation varies. Clinical manifestations of microsporia are manifested by erythema, alopecia, scaly and crust formation. The aim. Histological studies were performed to determine pathomorphological changes in the skin of guinea pigs during microsporia. The studies were conducted on clinically healthy and sick guinea pigs during the acute course of the disease, during regeneration and during recovery.And also carry out a description and characterization of the identified changes in the skin.The obtained research results showed that patients with microsporia had changes in the morphological composition of the skin, which were characterized by thickening and keratinization of the epidermis, there were small-focal polymorphic cell infiltrates, there was a violation of the microvasculature and the formation of micellar formations.Materials and methods. The material for histological examination(pieces of guinea pig skin) was fixed in a 10–12 % cooled solution of neutral formalin, followed by pouring into paraffin according to the scheme proposed by G.A. Merkulov (1969). Histomic sections 5–7 μm thick were made on the MC-2 dome microtome. Hematoxylin and eosin staining were used for the morphological evaluation of cells and tissue. Microscopy was performed using an OLIMPUS CX-41 microscope. Results. Signs of superficial inflammation with hyperkeratosis and desquamation of cells of the stratified epithelium, microcracks of the epidermis were found in the skin of the patient with microsporia of the tentacle during the acute course. Signs of inflammation of the follicles and surrounding tissues are visualized. Round-cell and plasma connective tissue infiltrates of the connective tissue of the skin were detected by lymphoid, histiocytic and other cellular elements. There is moderate leukocyte infiltration in the dermis. Signs of inflammation by type of infiltration around the hair follicles, enlargement of the blood capillaries and the presence of microabscesses. In the stage of regeneration during recovery, a clear contoured layer of epithelial cells is established. There are no signs of inflammatory reaction in the dermis. Conclusion. In microspores, inflammatory processes occur in all layers of the skin. The skin of sick animals loses its barrier function due to pathomorphological changes. The long-term consequences of the pathological process during the course of microspores can provoke the development of chronic dermatitis with scleroderma.

Dynamics of morphological, immunological and histological changes in microsporіа in guinea pigs

“…Layers of loose fine-fiber fabric are placed in separate bundles. The hypodermis is represented by loose connective tissue between the bundles of which are fibroblasts, histiocytes and fat cells, which when stained are determined in the form of transparent honeycomb structures (Kisera et al, 2020). 4 -hyperkeratosis, acanthosis, thickening of the stratum corneum; 5 -hyperplasia of basal layer cells; staining using hematoxylin and eosin Stratification of the dermis fibers at the 21st day after infection due to the course of inflammation occurs; there is an accumulation of inflammatory infiltrates around the hair follicles (Fig.…”