Morphofunctional evaluation of the effect of transplantation of allogeneic fibroblasts on healing of burn wounds in albino outbred mice and mutant Hr(hr)/Hr(hr) mice.

Morphofunctional evaluation of the effect of transplantation of allogeneic fibroblasts on skin regeneration after burn injury in albino outbred mice and mutant Hr(hr)/Hr(hr) (nude) mice was carried out using the radioautographic method. The pronounced stimulating effect of allogeneic fibroblasts on healing of burn wound observed in mice of both groups can be attributed to the action of bioactive substances released from destructed allogeneic fibroblasts and stimulating proliferation of stem/progenitor cells in the wound (epithelial cells in skin appendages and dermal cells in microvessel walls) at the early stages of healing.

Morphofunctional evaluation of the effect of collagen-1-based dressing on skin regeneration after burn trauma in mice of two genetic strains.

Morphofunctional evaluation of the effect of biological dressing with collagen-1 on healing of 3A degree burn wound in outbred and mutant Hr(hr)/Hr(hr)(hairless) mice was carried out by the histological method and optic radioautography. A pronounced stimulatory effect of the dressing on skin regeneration in mice was demonstrated. According to radioautography data, early dressing of the burn wounds in Hr(hr)/Hr(hr)mice led to active proliferation of epithelial cells in dermal cyst and vascular endotheliocytes.

[Dermal cysts participate in reparative regeneration of epidermis in Hr(hr)/Hr(hr) mice].

One of the phenotypic effects of mutation in the Hr gene in mice is disintegration of hair follicles and their degeneration into open funnel-shaped structures (utricles) opened on skin surface and cysts located in the depth of the dermis. The aim of the current study consists in analysis of the process of reparative regeneration of skin in homozygotous mice with one of the mutant alleles of the Hr gene-Hr(hr). It is shown that epithelial cells that constitute the inner pavement of cysts take part in the process of epithelization of deep skin wounds.

[Effect of 5-azadeoxycytidine and retinoic acid on expression of genomic imprinting in parthenogenetic mouse embryos].

The action of two types of substances has been studied: 5-azadeoxycytidine and retinoic acid, which have a demethylation effect on DNA in the development process of diploid parthenogenetic mouse embryos. The effect of 5-azadeoxycytidine on hybrid mice (CBAxC57BL/6)F1 in vitro for 6 h, in the presence of single cell parthenogenetic embryos during the S-phase of the cell cycle has been studied. After developing to the blastocyst stage in vitro, parthenogenetic embryos were transplanted into the uterus of false pregnant females.

[Expression of imprinted Igf2 and Peg1/Mest genes in postimplantation parthenogenetic mouse embryos treated with transforming growth factor alpha in vitro].

The effect of transforming growth factor alpha (TGFt) on the expression of imprinted Igf2 and Peg1/Mest genes was studied in diploid parthenogenetic embryos (PEs) of (CBA x C57BL/6)F1 mice during the postimplantation period of embryogenesis. The PEs were treated with TGFalpha in vitro at the morula stage and, after they developed to the blastocyst stage, were implanted into the uterus of false-pregnant females. On the tenth day of pregnancy, the PEs were explanted for subsequent in vitro culturing for 24 or 48 h.