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A study of the morphofunctional condition of mice with transplantable melanoma B16 under the influence of a normal daylight regime, constant lighting and constant darkness was conducted. It was shown that exposure to constant lighting leads to intensification of the proliferation of melanoma cells, more significant growth and spread of the tumor, the development of more pronounced secondary changes, the presence of perivascular growth and an increase in perineural invasion. At the same time, keeping of animals in constant darkness significantly reduced the intensity of the proliferative process in the tumor and lead to tumor regression in the absence of signs of lympho-, intravascular and intraneural invasion. Intergroup differences in tumor cell status were confirmed by the results of micromorphometric studies. It was also shown that the expression of clock genes was suppressed by an exposure to constant light, while an influence of constant darkness, on contrary, led to its intensification.


David A Areshidze, Maria A Kozlova, Maxim V Mnikhovich, Tatyana V Bezuglova, Valery P Chernikov, Zarina V Gioeva, Aleksey V Borisov. Influence of Various Light Regimes on Morphofunctional Condition of Transplantable Melanoma B16. Biomedicines. 2023 Apr 10;11(4)

PMID: 37189753

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