A new model to investigate UVB-induced cellular senescence and pigmentation in melanocytes.
Mech Ageing Dev
; 190: 111322, 2020 09.
Article
em En
| MEDLINE
| ID: mdl-32735894
ABSTRACT
Ultraviolet (UV) light is known to potentially damage human skin and accelerate the skin aging process. Upon UVB exposure, melanocytes execute skin protection by increasing melanin production. Senescent cells, including senescent melanocytes, are known to accumulate in aged skin and contribute to the age-associated decline of tissue function. However, melanocyte senescence is still insufficiently explored. Here we describe a new model to investigate mechanisms of UVB-induced senescence in melanocytes and its role in photoaging. Exposure to mild and repeated doses of UVB directly influenced melanocyte proliferation, morphology and ploidy. We confirmed UVB-induced senescence with increased senescence-associated ß-galactosidase positivity and changed expression of several senescence markers, including p21, p53 and Lamin B1. UVB irradiation impaired proteasome and increased autophagic activity in melanocytes, while expanding intracellular melanin content. In addition, using a co-culture system, we could confirm that senescence-associated secretory phenotype components secreted by senescent fibroblasts modulated melanogenesis. In conclusion, our new model serves as an important tool to explore UVB-induced melanocyte senescence and its involvement in photoaging and skin pigmentation.
Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Pele
/
Raios Ultravioleta
/
Pigmentação da Pele
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Envelhecimento da Pele
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Senescência Celular
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Fibroblastos
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Melanócitos
Limite:
Humans
Idioma:
En
Ano de publicação:
2020
Tipo de documento:
Article