MORPHOGENESIS OF SKIN REGENERATE AND LOCAL FACTORS OF ITS REGULATION

Abstract

Regeneration of the skin and its derivatives after injuries occurs in one of two ways: cutaneous (restitution) or dermal (substitution). However, there are three healing mechanisms: primary intention, secondary intention and healing by a scab. Regeneration activity correlates with environmental factors, stimulants, compliance with the chronovector of involvement in the cell regenerate of all differon derivatives, involved in histo- and organogenesis in the affected area. The aim of the study is to identify the importance of promoter cells, temperature and Eikovit gel at different stages of thermal burn wound healing, contact dermatitis and wound skin defects and to determine the stage of provisional regenerate transformation into the definitive state. Materials and Methods. The formation of reparative skin regenerate was studied on outbred male mice weighing 25±5 g (n=126). Different injuries to the skin of the back were modelled. All mice were divided into 4 groups: Full-thickness wound, Thermal burn, Contact dermatitis, and Control. Thermal damage was carried out with Tertsik RS232C device (Russia), module area – 1 cm2, exposure time – 3 minutes, and temperature – 80 °C. Contact dermatitis was modeled by rubbing a 0.5 % alcohol-acetone solution of 2,4-dinitrochlorobenzene (2,4-DNCB) into the skin. The skin wound was cut out using an oval stencil (3×4 mm). We used three temperature modes to influence the developing regenerate: +8 °C (cold), +42 °C (heat), and +33 °C (control). Sampling was conducted on days 3, 7, 10, 14, 20, 30 of the experiment, fixed in 10 % neutral formalin, and embedded in paraffin. Sections were stained with Mayer's hematoxylin and eosin. Immunohistochemistry detected CD1-alpha, CD3, and CD31. Proliferative activity was monitored by Ki-67-positive cells. Results. The convergence chronovector of immunocompetent cells during skin wound healing ensures the restitution of skin components and its derivatives. One of the signs of the correct chronovector direction is the formation of a provisional level substrate and its further transformation into a definitive state. Convergence desynchronosis can lead to dermal healing and substitution.