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1.
J Biophotonics ; 12(8): e201800461, 2019 08.
Artículo en Inglés | MEDLINE | ID: mdl-30972966

RESUMEN

Photobiomodulation was explored to find evidence of stimulation during the development of newborn rats. A light chamber device was used, and rat pups were divided into groups after birth. Investigation of the process' security was performed before the full experiment. Following a protocol of alternating illumination and mother's presence during the first 13 days, we observed that, in the group that received photobiomodulation, the pups opened their eyes faster, indicating earlier achievement of maturity. The rate of weight gain also indicates faster metabolic activity in the group that was photostimulated. This study is the first step toward the use of photobiomodulation for premature newborn human babies.


Asunto(s)
Aceleración , Crecimiento y Desarrollo/efectos de la radiación , Terapia por Luz de Baja Intensidad , Nacimiento Prematuro/radioterapia , Animales , Animales Recién Nacidos , Peso Corporal/efectos de la radiación , Humanos , Ratas
2.
Curr Biol ; 19(14): 1216-20, 2009 Jul 28.
Artículo en Inglés | MEDLINE | ID: mdl-19559617

RESUMEN

The synergism between red and blue light in the control of plant growth and development requires the coaction of the red light photoreceptor phytochrome B (phyB) and the blue light and UV-A receptor cryptochromes (cry). Here, we describe the mechanism of the coaction of these photoreceptors in controlling both development and physiology. In seedlings grown under red light, a transient supplement with blue light induced persistent changes in the transcriptome and growth patterns. Blue light enhanced the expression of the transcription factors LONG HYPOCOTYL 5 (HY5) and HOMOLOG OF HY5 (HYH) and of SUPPRESSOR OF PHYA 1 (SPA1) and SPA4. HY5 and HYH enhanced phyB signaling output beyond the duration of the blue light signal, and, contrary to their known role as repressors of phyA signaling, SPA1 and SPA4 also enhanced phyB signaling. These observations demonstrate that the mechanism of synergism involves the promotion by cry of positive regulators of phyB signaling. The persistence of the light-derived signal into the night commits the seedling to a morphogenetic and physiological program consistent with a photosynthetic lifestyle.


Asunto(s)
Arabidopsis/crecimiento & desarrollo , Regulación de la Expresión Génica de las Plantas/efectos de la radiación , Crecimiento y Desarrollo/efectos de la radiación , Luz , Transducción de Señal/efectos de la radiación , Arabidopsis/metabolismo , Proteínas de Arabidopsis/metabolismo , Factores de Transcripción con Cremalleras de Leucina de Carácter Básico/metabolismo , Proteínas Portadoras/metabolismo , Proteínas de Ciclo Celular/metabolismo , Color , Citocromos/metabolismo , Proteínas de Unión al ADN , Proteínas Nucleares/metabolismo , Análisis de Secuencia por Matrices de Oligonucleótidos , Fitocromo B/metabolismo , Proteínas Serina-Treonina Quinasas/metabolismo
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