Survivorship and mortality implications of developmental 670-nm phototherapy: dioxin co-exposure
| Autor: | Harry T. Whelan, Jinhwan Lim, Diane S. Henshel, Janis T. Eells, Phoebe Wakhungu, Stephen S. Heise, Ronnie L. Yeager, Deborah S. Millsap, Jill A. Franzosa |
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| Rok vydání: | 2006 |
| Předmět: |
Light therapy
medicine.medical_specialty animal structures Polychlorinated Dibenzodioxins Hatching medicine.medical_treatment Biomedical Engineering Embryo Chick Embryo Biology Phototherapy In ovo Embryonic stem cell Endocrinology Teratogens Internal medicine Survivorship curve embryonic structures medicine Animals heterocyclic compounds Radiology Nuclear Medicine and imaging Hatchling Incubation |
| Zdroj: | Photomedicine and laser surgery. 24(1) |
| ISSN: | 1549-5418 |
| Popis: | We assessed the effect of 670-nm light therapy on dioxin-induced embryonic mortality in chickens (Gallus gallus).Developmental photobiomodulation using 670-nm light-emitting diode (LED) arrays improves hatching success and increases body size in hatchling chickens. Photobiomodulation also stimulates signaling pathways resulting in improved energy metabolism, antioxidant production and cell survival. Dioxin causes embryonic mortality, including increases in the frequency of chicken embryos that pip but can't go to hatch. We hypothesized that 670-nm LED therapy would attenuate dioxin-induced embryo mortality.Fertile chicken eggs were injected with control or 2, 20, or 200 ppt 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD; dioxin) prior to the start of incubation. Half of the eggs in each dose group were treated once per day from embryonic days 0-20 with 670-nm LED light at a fluence of 4 J/cm(2). In ovo survival and hatching success were compared between dose groups and LED treatment.LED therapy decreased the embryonic mortality rate by 41%, resulting in increased embryonic survival and improved hatching success in eggs exposed to 200 ppt dioxin. However, at sub-lethal dioxin concentrations and in oil-treated controls, LED therapy slightly increased mortality.Overall survivorship and hatching success of chicks developmentally exposed to dioxin concentrations above the lethality threshold (100 ppt TCDD) is improved by 670-nm LED treatment administered throughout the gestation period, but the relationship may be complicated by an LED-oil interaction. |
| Databáze: | OpenAIRE |
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