Producción CyT
Artículo
Autoría
Daniel H. González Maglio
;
PAZ, MARIELA LAURA
;
Alejandro Ferrari
;
Federico S. Weill
;
Analía Czerniczyniec
;
Juliana Leoni
;
Juanita Bustamante
Fecha
2005
Editorial y Lugar de Edición
Blackwell
Revista
Photodermatology, Photoimmunology and Photomedicine,
vol. 21
(pp. 311-317)
- ISSN 0905-4383
Blackwell
Blackwell
ISSN
0905-4383
Resumen
Información suministrada por el agente en
SIGEVA
Background: Ultraviolet (UV) radiation is the main environmental carcinogen. It is able to induce injury in the keratinocytes, which triggers mechanisms in order to protect the skin against molecular alterations that may lead to the development of skin cancer. UVB is capable of producing genotoxic damage, directly or indirectly through reactive oxygen species, inducing DNA alterations and mutations. UVB radiation has also been associated with the generation of nitric oxide (NO), which is able t...
Background: Ultraviolet (UV) radiation is the main environmental carcinogen. It is able to induce injury in the keratinocytes, which triggers mechanisms in order to protect the skin against molecular alterations that may lead to the development of skin cancer. UVB is capable of producing genotoxic damage, directly or indirectly through reactive oxygen species, inducing DNA alterations and mutations. UVB radiation has also been associated with the generation of nitric oxide (NO), which is able to induce many physiological and physiopathological processes. The aim of the current study was to investigate the effect of UVB irradiation in hairless mice skin. Methods: We evaluated the effect of an acute dose (200 mJ/cm2) of UVB irradiation correlating with histological alterations, nitric oxide synthase expression and activity, mitochondrial respiratory function, superoxide anion production and lipid peroxidation, 0, 6, 17 and 24 h post-irradiation treatment. Results: Morphological analysis showed disruption of the epidermal stratum corneum and basale after UVB irradiation. The results indicated that skin UVB irradiation was associated with an increased cytosolic inducible nitric oxide synthase (iNOS) expression, inversely related to lipid peroxidation processes. An increase in mitochondrial superoxide anion (O2 ) and NO production 17 h post-irradiation was correlated with a mitochondrial dysfunction, all of them integrating the skin response to acute UVB irradiation. Conclusions: UVB irradiation of the skin produces morphological alterations as a consequence of the induction of molecular mechanisms associated with mitochondrial respiratory dysfunction and O2 production, probably mediated by the increased mitochondrial NO production. On the other hand lipid peroxidation decrease inversely correlates with cytosolic iNOS expression, suggesting a protective role for the inflammatory response.
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Palabras Clave
HAIRLESS MICE SKINUVB IRRADIATIONMITOCHONDRIAL DYSFUNCTIONNITRIC OXIDENOS