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Photoreactivation in Paramecium tetraurelia under Conditions of Various Degrees of Ozone Layer Depletion¶
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ABSTRACT
Photoreactivation (PR) is an efficient survival mechanism that helps protect cells against the harmful effects of solar-ultraviolet (UV) radiation. The PR mechanism involves photolyase, just one enzyme, and can repair DNA damage, such as cyclobutane-pyrimidine dimers (CPD) induced by near-UV/blue light, a component of sunlight. Although the balance of near-UV/blue light and far-UV light reaching the Earth's surface could be altered by the atmospheric ozone layer's depletion, e...
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Photoreactivation in Paramecium tetraurelia under Conditions of Various Degrees of Ozone Layer Depletion¶
Photochemistry and Photobiology
; ABSTRACT Photoreactivation (PR) is an efficient survival mechanism that helps protect cells against the harmful effects of solar-ultraviolet (UV) radiation. The PR mechanism involves photolyase, just one enzyme, and can repair DNA damage, such as cyclobutane-pyrimidine dimers (CPD) induced by
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The antiapoptotic effect of low-dose UVB irradiation in NIH3T3 cells involves caspase inhibition
Photochemistry and Photobiology
; The Antiapoptotic Effect of Low-dose UVB Irradiation in NIH3T3 Cells Involves Caspase Inhibition para ABSTRACT UVB irradiation is a well-known apoptosis induction factor. However, we have previously found that low doses of UVB irradiation inhibited apoptosis induced by both serum starvation and
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Inhibitory Effects of Mizolastine on Ultraviolet B-Induced Leukotriene B4 Production and 5-Lipoxygenase Expression in Normal Human Dermal Fibroblasts In Vitro
Photochemistry and Photobiology
; ABSTRACT Ultraviolet B (UVB) irradiation exerts hazardous effects such as acute photodamage, skin cancer and photoaging. In this study we evaluated the protective effects of a nonsedative histamine H1-receptor antagonist, mizolastine, on UVB-exposed skin dermal fibroblasts. Therefore, primary human
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Akt1-mediated Intracellular Oxidation after UVB Irradiation Suppresses Apoptotic Cell Death Induced by Cell Detachment and Serum Starvation
Photochemistry and Photobiology
; ABSTRACT Apoptosis is an important cell death system that deletes damaged and mutated cells to prevent cancer. We have previously reported that a certain dose of UVB irradiation inhibited the apoptosis induced by serum starvation and cell detachment, leading to cell transformation. This
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Ovariectomy acceleraties photoaging of rat skin
Photochemistry and Photobiology
; ABSTRACT We have previously reported the formation of wrinkles, a decrease in skin elasticity and a loss in the linearity of dermal elastic fibers in rat hind limb skin irradiated with ultraviolet radiation in wavelength ranging 290-320 nm (UVB) at a suberythemal dose for 6 weeks. Estrogens are
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Dietary, but not topical, alpha-linolenic acid suppresses UVB-induced skin injury in hairless mice when compared with linoleic acid
Photochemistry and Photobiology
; Dietary, but not Topical, Alpha-linolenic Acid Suppresses UVB-induced Skin Injury in Hairless Mice when Compared with Linoleic Acid(para) ABSTRACT Peroxidizability of fatty acids in the air is roughly proportional to the number of double bonds, but in vivo peroxidation proceeds in a more complex
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Topical delivery of retinoids counteracts the UVB-induced epidermal vitamin A depletion in hairless mouse
Photochemistry and Photobiology
; ... topical vitamin A modulate retinol esterification in hairless mice epidermis. Acta Dermato-Venereol 68, 291-299. 11. Sorg, O., C. Tran, P. Carraux, L. Didierjean and J. H. Saurat (1999) Retinol and retinyl ester epidermal pools are not identically sensitive to ...
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Ultraviolet irradiation (UVB) interrupts calcium cell signaling in lens epithelial cells
Photochemistry and Photobiology
; ABSTRACT A preliminary study was undertaken to establish whether low-dose UV irradiation (UVB) affects calcium cell signaling in rabbit lens epithelia. In a suspension of lens epithelial cells (line NN1003A), changes in intracellular Ca^sup 2+^ were measured by Fura-2 fluorescence in response to
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Topically applied eicosapentaenoic acid protects against local immunosuppression induced by UVB irradiation, cis-urocanic acid and thymidine dinucleotides
Photochemistry and Photobiology
; Topically Applied Eicosapentaenoic Acid Protects Against Local Immunosuppression Induced by UVB Irradiation, cis-Urocanic Acid and Thymidine Dinucleotides* ABSTRACT UVB-induced immunosuppression, a promoter of photocarcinogenesis, involves the formation of pyrimidine dimers and cis-urocanic acid
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P53-dependent UVB responsiveness of human keratinocytes can be altered by cultivation on cell cycle-arrested dermal fibroblasts
Photochemistry and Photobiology
; ABSTRACT In cultured human keratinocytes, the tumor suppressor p53 acts as a control element in the protective response to UVB radiation and is affected by a variety of factors linked to cellular adhesion and differentiation. Because keratinocytes within the epidermis are not a homogeneous
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