1
|
Anderson G, Borooah S, Megaw R, Bagnaninchi P, Weller R, McLeod A, Dhillon B. UVR and RPE - The Good, the Bad and the degenerate Macula. Prog Retin Eye Res 2024; 100:101233. [PMID: 38135244 DOI: 10.1016/j.preteyeres.2023.101233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2023] [Revised: 12/15/2023] [Accepted: 12/15/2023] [Indexed: 12/24/2023]
Abstract
Ultraviolet Radiation (UVR) has a well-established causative influence within the aetiology of conditions of the skin and the anterior segment of the eye. However, a grounded assessment of the role of UVR within conditions of the retina has been hampered by a historical lack of quantitative, and spectrally resolved, assessment of how UVR impacts upon the retina in terms congruent with contemporary theories of ageing. In this review, we sought to summarise the key findings of research investigating the connection between UVR exposure in retinal cytopathology while identifying necessary avenues for future research which can deliver a deeper understanding of UVR's place within the retinal risk landscape.
Collapse
Affiliation(s)
- Graham Anderson
- Centre for Regenerative Medicine, University of Edinburgh, Edinburgh BioQuarter, EH16 4UU, UK
| | - Shyamanga Borooah
- Viterbi Family Department of Ophthalmology, Shiley Eye Institute, UC San Diego, CA, 92093-0946, USA
| | - Roly Megaw
- Institute of Genetics and Cancer, University of Edinburgh, Western General Hospital, EH4 2XU, UK; Department of Clinical Ophthalmology, National Health Service Scotland, Edinburgh, EH3 9HA, UK
| | - Pierre Bagnaninchi
- Centre for Regenerative Medicine, University of Edinburgh, Edinburgh BioQuarter, EH16 4UU, UK; Robert O Curle Eyelab, Instute for Regeneration and Repair, Edinburgh BioQuarter, 4-5 Little France Drive, Edinburgh, EH16 4UU, UK
| | - Richard Weller
- Centre for Inflammation Research, University of Edinburgh, Edinburgh BioQuarter, EH16 4TJ, UK
| | - Andrew McLeod
- School of GeoSciences, University of Edinburgh, Crew Building, King's Buildings, EH9 3FF, UK
| | - Baljean Dhillon
- Department of Clinical Ophthalmology, National Health Service Scotland, Edinburgh, EH3 9HA, UK; Centre for Clinical Brain Sciences, University of Edinburgh, Edinburgh BioQuarter, EH16 4SB, UK; Robert O Curle Eyelab, Instute for Regeneration and Repair, Edinburgh BioQuarter, 4-5 Little France Drive, Edinburgh, EH16 4UU, UK.
| |
Collapse
|
2
|
Geng R, Kang SG, Huang K, Tong T. Dietary supplementation with α-ionone alleviates chronic UVB exposure-induced skin photoaging in mice. Food Funct 2024; 15:1884-1898. [PMID: 38328833 DOI: 10.1039/d3fo04379g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2024]
Abstract
Photoaging is widely regarded as the most significant contributor to skin aging damage. It is triggered by prolonged exposure to ultraviolet (UV) light and typically manifests as dryness and the formation of wrinkles. Nutritional intervention is a viable strategy for preventing and treating skin photoaging. In previous studies, we demonstrated that α-ionone had ameliorating effects on photoaging in both epidermal keratinocytes and dermal fibroblasts. Here, we investigated the potential anti-photoaging effects of dietary α-ionone using a UVB-irradiated male C57BL/6N mouse model. Our findings provided compelling evidence that dietary α-ionone alleviates wrinkle formation, skin dryness, and epidermal thickening in chronic UVB-exposed mice. α-Ionone accumulated in mouse skin after 14 weeks of dietary intake of α-ionone. α-Ionone increased collagen density and boosted the expression of collagen genes, while attenuating the UVB-induced increase of matrix metalloproteinase genes in the skin tissues. Furthermore, α-ionone suppressed the expression of senescence-associated secretory phenotypes and reduced the expression of the senescence marker p21 and DNA damage marker p53 in the skin of UVB-irradiated mice. Transcriptome sequencing results showed that α-ionone modifies gene expression profiles of skin. Multiple pathway enrichment analyses on both the differential genes and the entire genes revealed that α-ionone significantly affects multiple physiological processes and signaling pathways associated with skin health and diseases, of which the p53 signaling pathway may be the key signaling pathway. Taken together, our findings reveal that dietary α-ionone intervention holds promise in reducing the risks of skin photoaging, offering a potential strategy to address skin aging concerns.
Collapse
Affiliation(s)
- Ruixuan Geng
- Key Laboratory of Precision Nutrition and Food Quality, Key Laboratory of Functional Dairy, Ministry of Education, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, PR China.
- Key Laboratory of Safety Assessment of Genetically Modified Organism (Food Safety), Ministry of Agriculture, Beijing 100083, PR China
- Beijing Laboratory for Food Quality and Safety, Beijing 100083, PR China
| | - Seong-Gook Kang
- Department of Food Engineering and Solar Salt Research Center, Mokpo National University, Muangun 58554, Republic of Korea
| | - Kunlun Huang
- Key Laboratory of Precision Nutrition and Food Quality, Key Laboratory of Functional Dairy, Ministry of Education, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, PR China.
- Key Laboratory of Safety Assessment of Genetically Modified Organism (Food Safety), Ministry of Agriculture, Beijing 100083, PR China
- Beijing Laboratory for Food Quality and Safety, Beijing 100083, PR China
| | - Tao Tong
- Key Laboratory of Precision Nutrition and Food Quality, Key Laboratory of Functional Dairy, Ministry of Education, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, PR China.
- Key Laboratory of Safety Assessment of Genetically Modified Organism (Food Safety), Ministry of Agriculture, Beijing 100083, PR China
- Beijing Laboratory for Food Quality and Safety, Beijing 100083, PR China
| |
Collapse
|
3
|
Hasan M, Reyer H, Oster M, Trakooljul N, Ponsuksilli S, Magowan E, Fischer DC, Wimmers K. Exposure to artificial ultraviolet-B light mediates alterations on the hepatic transcriptome and vitamin D metabolism in pigs. J Steroid Biochem Mol Biol 2024; 236:106428. [PMID: 37984748 DOI: 10.1016/j.jsbmb.2023.106428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Revised: 10/28/2023] [Accepted: 11/17/2023] [Indexed: 11/22/2023]
Abstract
In the currently prevailing pig husbandry systems, the vitamin D status is almost exclusively dependent on dietary supply. Additional endogenous vitamin D production after exposure to ultraviolet-B (UVB) light might allow the animals to utilize minerals in a more efficient manner, as well as enable the production of functional vitamin D-enriched meat for human consumption. In this study, growing pigs (n = 16) were subjected to a control group or to a daily narrowband UVB exposure of 1 standard erythema dose (SED) for a period of 9 weeks until slaughter at a body weight of 105 kg. Transcriptomic profiling of liver with emphasis on the associated effects on vitamin D metabolism due to UVB exposure were evaluated via RNA sequencing. Serum was analyzed for vitamin D status and health parameters such as minerals and biochemical markers. The serum concentration of calcidiol, but not calcitriol, was significantly elevated in response to UVB exposure after 17 days on trial. No effects of UVB exposure were observed on growth performance and blood test results. At slaughter, the RNA sequencing analyses following daily UVB exposure revealed 703 differentially expressed genes (DEGs) in liver tissue (adjusted p-value < 0.01). Results showed that molecular pathways for vitamin D synthesis (CYP2R1) rather than cholesterol synthesis (DHCR7) were preferentially initiated in liver. Gene enrichment (p < 0.05) was observed for reduced cholesterol/steroid biosynthesis, SNARE interactions in vesicular transport, and CDC42 signaling. Taken together, dietary vitamin D supply can be complemented via endogenous production after UVB exposure in pig husbandry, which could be considered in the development of functional foods.
Collapse
Affiliation(s)
- Maruf Hasan
- Research Institute for Farm Animal Biology (FBN), Dummerstorf, Germany
| | - Henry Reyer
- Research Institute for Farm Animal Biology (FBN), Dummerstorf, Germany
| | - Michael Oster
- Research Institute for Farm Animal Biology (FBN), Dummerstorf, Germany
| | - Nares Trakooljul
- Research Institute for Farm Animal Biology (FBN), Dummerstorf, Germany
| | | | - Elizabeth Magowan
- Agri-Food and Biosciences Institute, Large Park, Hillsborough, Co Down, BT26 6DR, United Kingdom
| | - Dagmar-Christiane Fischer
- Department of Pediatrics, Rostock University Medical Center, Ernst-Heydemann-Str. 8, 18057 Rostock, Germany
| | - Klaus Wimmers
- Research Institute for Farm Animal Biology (FBN), Dummerstorf, Germany; Faculty of Agricultural and Environmental Sciences, University Rostock, Rostock, Germany.
| |
Collapse
|
4
|
Xu Q, Wang X, Bai Y, Zheng Y, Duan J, Du J, Wu X. Trends of non-melanoma skin cancer incidence in Hong Kong and projection up to 2030 based on changing demographics. Ann Med 2023; 55:146-154. [PMID: 36519234 PMCID: PMC9762823 DOI: 10.1080/07853890.2022.2154382] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
OBJECTIVE To assess the trends in non-melanoma skin cancer (NMSC) incidence in Hong Kong from 1990 to 2019 and the associations of age, calendar period, and birth cohort, to make projections to 2030, and to examine the drivers of NMSC incidence. METHODS We assessed the age, calendar period, and birth cohort effects of NMSC incidence in Hong Kong between 1990 and 2019 using an age-period-cohort model. Using Bayesian age-period-cohort analysis with integrated nested Laplace approximations, we projected the incidence of NMSC in Hong Kong to 2030. RESULTS From 1990 to 2019, the age-standardized incidence rate of NMSC increased from 6.7 per 100,000 population to 8.6 per 100,000 population in men and from 5.4 per 100,000 to 5.9 per 100,000 population in women, among the 19,568 patients in the study (9812 male patients [50.14%]). The annual net drift was 2.00% (95% confidence interval [CI]: 1.50-2.50%) for men and 1.53% (95% CI: 0.95-2.11%) for women. Local drifts increased for both sexes above the 35-39-year age group. The period and cohort risk of developing NMSC tended to rise but slowed gradually in the most recent period and post-1975 birth cohort. From 2019 to 2030, it is projected that the number of newly diagnosed NMSC cases in Hong Kong will increase from 564 to 829 in men and from 517 to 863 in women. Population aging, population growth, and epidemiologic changes contributed to the increase in incident NMSCs, with population aging being the most significant contributor. CONCLUSION The slowing of the period and cohort effects suggests that the rising incidence of NMSC is partly attributable to increased awareness and diagnosis. The increasing prevalence of NMSC among the elderly and an aging population will significantly impact the clinical workload associated with NMSC for the foreseeable future.
Collapse
Affiliation(s)
- Qingqiang Xu
- Institute of Dermatology, Shaanxi Institution of Traditional Chinese Medicine, Shaanxi Traditional Chinese Medicine Hospital, Xi'an, Shaanxi, China
| | - Xiaoyan Wang
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Yan Bai
- School of Continuing Education, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Yan Zheng
- Department of Dermatology, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Junbo Duan
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Jianqiang Du
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Xiaoming Wu
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| |
Collapse
|
5
|
Quan QL, Yoon KN, Lee JS, Kim EJ, Lee DH. Impact of ultraviolet radiation on cardiovascular and metabolic disorders: The role of nitric oxide and vitamin D. PHOTODERMATOLOGY, PHOTOIMMUNOLOGY & PHOTOMEDICINE 2023; 39:573-581. [PMID: 37731181 DOI: 10.1111/phpp.12914] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Revised: 08/30/2023] [Accepted: 09/01/2023] [Indexed: 09/22/2023]
Abstract
BACKGROUND/PURPOSE Ultraviolet (UV) radiation has both harmful and beneficial effects on human skin and health. It causes skin damage, aging, and cancer; however, it is also a primary source of vitamin D. Additionally, UV radiation can impact energy metabolism and has protective effects on several cardiovascular and metabolic disorders in mice and humans. However, the mechanisms of UV protection against these diseases have not been clearly identified. METHODS This review summarizes the systemic effects of UV radiation on hypertension and several metabolic diseases such as obesity, diabetes, and nonalcoholic fatty liver disease (NAFLD) in mice, and we also consider the mechanisms of action of the related regulators nitric oxide (NO) and vitamin D. RESULTS UV exposure can lower blood pressure and prevent the development of cardiovascular diseases and metabolic disorders, such as metabolic syndrome, obesity, and type 2 diabetes, primarily through mechanisms that depend on UV-induced NO. UV radiation may also effectively delay the onset of type 1 diabetes through mechanisms that rely on UV-induced vitamin D. UV-induced NO and vitamin D play roles in preventing and slowing the progression of NAFLD. CONCLUSION UV exposure is a promising nonpharmacological intervention for cardiovascular and metabolic disorders. NO and vitamin D may play a crucial role in mediating these effects. However, further investigations are required to elucidate the exact mechanisms and determine the optimal dosage and exposure duration of UV radiation.
Collapse
Affiliation(s)
- Qing-Ling Quan
- Department of Dermatology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea
- Laboratory of Cutaneous Aging Research, Biomedical Research Institute, Seoul National University Hospital, Seoul, Korea
- Institute of Human-Environment Interface Biology, Seoul National University, Seoul, Korea
| | - Kyeong-No Yoon
- Department of Dermatology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea
- Laboratory of Cutaneous Aging Research, Biomedical Research Institute, Seoul National University Hospital, Seoul, Korea
- Institute of Human-Environment Interface Biology, Seoul National University, Seoul, Korea
| | - Ji Su Lee
- Department of Dermatology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea
- Laboratory of Cutaneous Aging Research, Biomedical Research Institute, Seoul National University Hospital, Seoul, Korea
- Institute of Human-Environment Interface Biology, Seoul National University, Seoul, Korea
| | - Eun Ju Kim
- Department of Dermatology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea
- Laboratory of Cutaneous Aging Research, Biomedical Research Institute, Seoul National University Hospital, Seoul, Korea
- Institute of Human-Environment Interface Biology, Seoul National University, Seoul, Korea
| | - Dong Hun Lee
- Department of Dermatology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea
- Laboratory of Cutaneous Aging Research, Biomedical Research Institute, Seoul National University Hospital, Seoul, Korea
- Institute of Human-Environment Interface Biology, Seoul National University, Seoul, Korea
| |
Collapse
|
6
|
Geng R, Fang J, Kang SG, Huang K, Tong T. Chronic exposure to UVB induces nephritis and gut microbiota dysbiosis in mice based on the integration of renal transcriptome profiles and 16S rRNA sequencing data. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2023; 333:122035. [PMID: 37343920 DOI: 10.1016/j.envpol.2023.122035] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Revised: 06/02/2023] [Accepted: 06/12/2023] [Indexed: 06/23/2023]
Abstract
Ultraviolet (UV) is a common and abundant environmental factor that affects daily life. Although the effects of UV radiation on the skin have been extensively reported, studies on the influence of UV radiation on internal organs are still limited. This study aimed to evaluate the influence of UVB exposure on the kidney of mice and to investigate the possible mechanism. In the present study, histopathology changes, oxidative stress, and inflammatory response were used to evaluate the kidney and colon injury induced by UVB exposure. The results showed that the 14-week chronic skin exposure to UVB triggers a kidney injury response characterized by macrophage infiltration, elevated oxidative stress as well as inflammatory and injury markers. The RNA sequencing demonstrated that chronic UVB exposure could alter the kidney transcriptomic profile distinguished by the regulation of genes involved in the Notch signaling pathway, JAK-STAT signaling pathway, and ECM-receptor interaction. Besides, chronic UVB exposure also resulted in gut dysbiosis, manifested as colon macrophage infiltration, stimulated inflammatory responses, impaired barrier integrity, and microbiota structural and functional disorders. The Spearman analysis results further revealed a strong correlation between gut microbiota and kidney injury. In conclusion, skin chronic exposure to UVB causes nephritis and gut microbiota dysbiosis in mice, and these findings provide new insight into the underlying risks of chronic UVB exposure to human wellness.
Collapse
Affiliation(s)
- Ruixuan Geng
- Key Laboratory of Precision Nutrition and Food Quality, Key Laboratory of Functional Dairy, Ministry of Education; College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China.
| | - Jingjing Fang
- Key Laboratory of Precision Nutrition and Food Quality, Key Laboratory of Functional Dairy, Ministry of Education; College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - Seong-Gook Kang
- Department of Food Engineering, Mokpo National University, Muangun 58554, South Korea
| | - Kunlun Huang
- Key Laboratory of Precision Nutrition and Food Quality, Key Laboratory of Functional Dairy, Ministry of Education; College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China; Key Laboratory of Safety Assessment of Agricultural Genetically Modified Organisms (Food), Ministry of Agriculture and Rural Affairs, Beijing, China; Beijing Laboratory for Food Quality and Safety, Beijing, China
| | - Tao Tong
- Key Laboratory of Precision Nutrition and Food Quality, Key Laboratory of Functional Dairy, Ministry of Education; College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China; Key Laboratory of Safety Assessment of Agricultural Genetically Modified Organisms (Food), Ministry of Agriculture and Rural Affairs, Beijing, China; Beijing Laboratory for Food Quality and Safety, Beijing, China.
| |
Collapse
|
7
|
Dos Santos EA, Cavalheiro LAM, Rodrigues D, Machado-Rodrigues A, Silva MR, Nogueira H, Padez C. Is more prolonged sun exposure associated with healthier life habits and obesity indicators in Portuguese children? Am J Hum Biol 2023; 35:e23918. [PMID: 37228007 DOI: 10.1002/ajhb.23918] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Revised: 04/12/2023] [Accepted: 05/08/2023] [Indexed: 05/27/2023] Open
Abstract
OBJECTIVES Sun exposure seems to have an indirect effect on the development of obesity through vitamin D synthesis in the skin, the primary source of this vitamin. The present study aimed to investigate associations among sun exposure time, obesity indicators, and lifestyle habits in children. METHODS A total of 4755 children (3-10 years; 49.86% boys) from the north, center and south-central Portugal were included in the present study. During 2016/2017 children's sun exposure time, screen time, time devoted to the practice of physical activity and active play were collected through standard questionnaires answered by parents. Statistical analyses were conducted to investigate differences among sun exposure time according to the sex, age, obesity indicators and lifestyle habits. RESULTS Linear regression analysis showed that sun exposure time presented a negative association with Body Mass Index (β = -0.09, 95% CI: -0.18; -0.003; p = .042), body fat % (β = -0.31, 95%; CI: -0.54; -0.07; p = .010), computer time (β = -0.08, 95% CI: -0.12; - 0.05; p < .0001) and a positive association with active play time (β = 0.22, 95% CI: 0.17; 0.27; p < .0001) and total time of physical activity practice (β = 10.01, 95% CI: 4.52; 15.20; p < .0001). CONCLUSIONS The results reinforce the need for future guidance on the ideal sun exposure time, especially in children, who are at risk for vitamin D deficiency. Standardization of criteria for classifying optimal sun exposure time in this age group, considering the parameters that affect vitamin D status, such as age and seasonality, should be considered when planning future guidelines.
Collapse
Affiliation(s)
- Elizabete A Dos Santos
- Nutrition Department, School of Public Health, University of São Paulo, São Paulo, Brazil
| | | | - Daniela Rodrigues
- Research Centre for Anthropology and Health, Department of Life Sciences, University of Coimbra, Coimbra, Portugal
| | | | - Maria-Raquel Silva
- Research Centre for Anthropology and Health, Department of Life Sciences, University of Coimbra, Coimbra, Portugal
- Faculty of Health Sciences, University Fernando Pessoa, Porto, Portugal
- Comprehensive Health Research Centre-Group of Sleep, Chronobiology and Sleep Disorders-Nova Medical School, University of Lisbon, Lisbon, Portugal
| | - Helena Nogueira
- Research Centre for Anthropology and Health, Department of Geography and Tourism, University of Coimbra, Coimbra, Portugal
| | - Cristina Padez
- Research Centre for Anthropology and Health, Department of Life Sciences, University of Coimbra, Coimbra, Portugal
| |
Collapse
|
8
|
De Silva WGM, McCarthy BY, Han J, Yang C, Holland AJA, Stern H, Dixon KM, Tang EKY, Tuckey RC, Rybchyn MS, Mason RS. The Over-Irradiation Metabolite Derivative, 24-Hydroxylumister-ol 3, Reduces UV-Induced Damage in Skin. Metabolites 2023; 13:775. [PMID: 37512482 PMCID: PMC10383208 DOI: 10.3390/metabo13070775] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Revised: 06/13/2023] [Accepted: 06/16/2023] [Indexed: 07/30/2023] Open
Abstract
The hormonal form of vitamin D3, 1,25(OH)2D3, reduces UV-induced DNA damage. UV exposure initiates pre-vitamin D3 production in the skin, and continued UV exposure photoisomerizes pre-vitamin D3 to produce "over-irradiation products" such as lumisterol3 (L3). Cytochrome P450 side-chain cleavage enzyme (CYP11A1) in skin catalyzes the conversion of L3 to produce three main derivatives: 24-hydroxy-L3 [24(OH)L3], 22-hydroxy-L3 [22(OH)L3], and 20,22-dihydroxy-L3 [20,22(OH)L3]. The current study investigated the photoprotective properties of the major over-irradiation metabolite, 24(OH)L3, in human primary keratinocytes and human skin explants. The results indicated that treatment immediately after UV with either 24(OH)L3 or 1,25(OH)2D3 reduced UV-induced cyclobutane pyrimidine dimers and oxidative DNA damage, with similar concentration response curves in keratinocytes, although in skin explants, 1,25(OH)2D3 was more potent. The reductions in DNA damage by both compounds were, at least in part, the result of increased DNA repair through increased energy availability via increased glycolysis, as well as increased DNA damage recognition proteins in the nucleotide excision repair pathway. Reductions in UV-induced DNA photolesions by either compound occurred in the presence of lower reactive oxygen species. The results indicated that under in vitro and ex vivo conditions, 24(OH)L3 provided photoprotection against UV damage similar to that of 1,25(OH)2D3.
Collapse
Affiliation(s)
| | - Bianca Yuko McCarthy
- School of Medical Sciences and Bosch Institute, The University of Sydney, Sydney, NSW 2006, Australia
| | - Jeremy Han
- School of Medical Sciences and Bosch Institute, The University of Sydney, Sydney, NSW 2006, Australia
| | - Chen Yang
- School of Medical Sciences and Bosch Institute, The University of Sydney, Sydney, NSW 2006, Australia
| | - Andrew J A Holland
- Douglas Cohen Department of Paediatric Surgery, The Children's Hospital at Westmead Clinical School, The Faculty of Medicine and Health, The University of Sydney, Sydney, NSW 2006, Australia
| | - Harvey Stern
- Department of Plastic and Constructive Surgery, The Royal Prince Alfred Hospital, Sydney, NSW 2050, Australia
- Strathfield Private Hospital, Sydney, NSW 2042, Australia
| | - Katie Marie Dixon
- School of Medical Sciences and Bosch Institute, The University of Sydney, Sydney, NSW 2006, Australia
| | - Edith Kai Yan Tang
- School of Molecular Sciences, The University of Western Australia, Perth, WA 6009, Australia
| | - Robert Charles Tuckey
- School of Molecular Sciences, The University of Western Australia, Perth, WA 6009, Australia
| | - Mark Stephen Rybchyn
- School of Medical Sciences and Bosch Institute, The University of Sydney, Sydney, NSW 2006, Australia
| | - Rebecca Sara Mason
- School of Medical Sciences and Bosch Institute, The University of Sydney, Sydney, NSW 2006, Australia
- School of Life and Environmental Sciences, Charles Perkins Centre, University of Sydney, Sydney, NSW 2006, Australia
| |
Collapse
|
9
|
Dry Eye Disease: What Is the Role of Vitamin D? Int J Mol Sci 2023; 24:ijms24021458. [PMID: 36674972 PMCID: PMC9860626 DOI: 10.3390/ijms24021458] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Revised: 01/03/2023] [Accepted: 01/03/2023] [Indexed: 01/13/2023] Open
Abstract
Dry eye disease (DED) is a multifactorial condition resulting from reduced tear secretion from the lacrimal glands, increased tear water evaporation or the production of poor-quality tears. Such tear instability can lead to inflammation and damage of the ocular surface, as well as to abnormal nociception. Historically, tear substitutes and corticosteroids have been the bastion of DED therapy, but a substantial number of patients still suffer from residual symptoms even after being treated with traditional treatments. Aiming to find safe and effective alternative therapies, recent efforts have been focused on the role of vitamin D in the cellular physiology of the eye. Possibly because of its positive effect in modulating the immune and inflammatory responses, the systemic supplementation of vitamin D seems, indeed, to be an effective therapeutic strategy, especially, but not only, for patients affected by DED that does not respond to conventional treatments. In this context, this review focuses on the literature reporting on the pathogenesis and treatment of DED, with a special emphasis on the recent investigations reporting on the potential role of the systemic administration of vitamin D as a therapeutic approach in the management of such condition.
Collapse
|
10
|
Guan Q, Wang Z, Cao J, Dong Y, Chen Y. The role of light pollution in mammalian metabolic homeostasis and its potential interventions: A critical review. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 312:120045. [PMID: 36030956 DOI: 10.1016/j.envpol.2022.120045] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 08/17/2022] [Accepted: 08/20/2022] [Indexed: 06/15/2023]
Abstract
Irregular or unnatural artificial light causes severe environmental stress on the survival and health of organisms, which is rapidly becoming a widespread new type of environmental pollution. A series of disruptive behaviors to body homeostasis brought about by light pollution, including metabolic abnormalities, are likely to be the result of circadian rhythm disturbances. Recently, the proposed role of light pollution in metabolic dysregulation has accelerated it into an emerging field. Hence, the regulatory role of light pollution in mammalian metabolic homeostasis is reviewed in this contribution. Light at night is the most widely affected type of light pollution, which disrupts metabolic homeostasis largely due to its disruption of daily food intake patterns, alterations of hormone levels such as melatonin and glucocorticoids, and changes in the rhythm of inflammatory factor production. Besides, light pollution impairs mammalian metabolic processes in an intensity-, photoperiod-, and wavelength-dependent manner, and is also affected by species, gender, and diets. Nevertheless, metabolic disorders triggered by light pollution are not irreversible to some extent. Potential interventions such as melatonin supplementation, recovery to the LD cycle, time-restricted feeding, voluntary exercise, wearing blue light-shied goggles, and bright morning light therapy open a bright avenue to prevent light pollution. This work will help strengthen the relationship between light information and metabolic homeostasis and provide new insights for the better prevention of metabolic disorders and light pollution.
Collapse
Affiliation(s)
- Qingyun Guan
- College of Veterinary Medicine, China Agricultural University, Haidian, Beijing 100193, China
| | - Zixu Wang
- College of Veterinary Medicine, China Agricultural University, Haidian, Beijing 100193, China
| | - Jing Cao
- College of Veterinary Medicine, China Agricultural University, Haidian, Beijing 100193, China
| | - Yulan Dong
- College of Veterinary Medicine, China Agricultural University, Haidian, Beijing 100193, China
| | - Yaoxing Chen
- College of Veterinary Medicine, China Agricultural University, Haidian, Beijing 100193, China; Department of Nutrition and Health, China Agricultural University, Haidian, Beijing 100193, China.
| |
Collapse
|
11
|
Hazell G, Khazova M, Cohen H, Felton S, Raj K. Post-exposure persistence of nitric oxide upregulation in skin cells irradiated by UV-A. Sci Rep 2022; 12:9465. [PMID: 35676302 PMCID: PMC9177615 DOI: 10.1038/s41598-022-13399-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Accepted: 05/24/2022] [Indexed: 11/28/2022] Open
Abstract
Evidence suggests that exposure to UV-A radiation can liberate nitric oxide from skin cells eliciting vasodilation in-vivo. However, the duration of nitric oxide release in skin cells after UV exposure is not well studied, with emphasis on UV-B mediated iNOS upregulation. The current study demonstrated persistence of nitric oxide release in a dark reaction after moderate UV-A exposure, peaking around 48 h post exposure; this effect was shown in keratinocytes, fibroblasts and endothelial cells from neonatal donors and keratinocytes from aged donors and confirmed the hypothesis that UV-A exposure appeared to upregulate cNOS alongside iNOS. Release of nitric oxide in the skin cells induced by a moderate exposure to UV-A in sunlight may be especially beneficial for some demographic groups such as the elderly, hypertensive patients or those with impaired nitric oxide function, not only during exposure but many hours and days after that.
Collapse
Affiliation(s)
- Gareth Hazell
- UK Health Security Agency, Chilton, Didcot, OX11 0RQ, UK.
| | - Marina Khazova
- UK Health Security Agency, Chilton, Didcot, OX11 0RQ, UK
| | - Howard Cohen
- Elizabeth House, 515 Limpsfield Road, Warlingham, CR6 9LF, Surrey, UK
| | - Sarah Felton
- Oxford University Hospitals NHS Foundation Trust, Old Road, Oxford, OX3 7LJ, UK
| | - Ken Raj
- UK Health Security Agency, Chilton, Didcot, OX11 0RQ, UK
| |
Collapse
|
12
|
Bennour I, Haroun N, Sicard F, Mounien L, Landrier JF. Vitamin D and Obesity/Adiposity—A Brief Overview of Recent Studies. Nutrients 2022; 14:nu14102049. [PMID: 35631190 PMCID: PMC9143180 DOI: 10.3390/nu14102049] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Revised: 05/10/2022] [Accepted: 05/11/2022] [Indexed: 12/12/2022] Open
Abstract
Observational studies classically find an inverse relationship between human plasma 25-hydroxyvitamin D concentration and obesity. However, interventional and genetic studies have failed to provide clear conclusions on the causal effect of vitamin D on obesity/adiposity. Likewise, vitamin D supplementation in obese rodents has mostly failed to improve obesity parameters, whereas several lines of evidence in rodents and prospective studies in humans point to a preventive effect of vitamin D supplementation on the onset of obesity. Recent studies investigating the impact of maternal vitamin D deficiency in women and in rodent models on adipose tissue biology programming in offspring further support a preventive metabolically driven effect of vitamin D sufficiency. The aim of this review is to summarize the state of the knowledge on the relationship between vitamin D and obesity/adiposity in humans and in rodents and the impact of maternal vitamin D deficiency on the metabolic trajectory of the offspring.
Collapse
Affiliation(s)
- Imene Bennour
- Aix-Marseille Université, C2VN, INRAE, INSERM, 13000 Marseille, France; (I.B.); (N.H.); (F.S.); (L.M.)
| | - Nicole Haroun
- Aix-Marseille Université, C2VN, INRAE, INSERM, 13000 Marseille, France; (I.B.); (N.H.); (F.S.); (L.M.)
| | - Flavie Sicard
- Aix-Marseille Université, C2VN, INRAE, INSERM, 13000 Marseille, France; (I.B.); (N.H.); (F.S.); (L.M.)
- PhenoMARS Aix-Marseille Technology Platform, CriBiom, 13000 Marseille, France
| | - Lourdes Mounien
- Aix-Marseille Université, C2VN, INRAE, INSERM, 13000 Marseille, France; (I.B.); (N.H.); (F.S.); (L.M.)
- PhenoMARS Aix-Marseille Technology Platform, CriBiom, 13000 Marseille, France
| | - Jean-François Landrier
- Aix-Marseille Université, C2VN, INRAE, INSERM, 13000 Marseille, France; (I.B.); (N.H.); (F.S.); (L.M.)
- PhenoMARS Aix-Marseille Technology Platform, CriBiom, 13000 Marseille, France
- Correspondence: ; Tel.: +33-4-9129-4275
| |
Collapse
|
13
|
Wang J, Pothana K, Chen S, Sawant H, Travers JB, Bihl J, Chen Y. Ultraviolet B Irradiation Alters the Level and miR Contents of Exosomes Released by Keratinocytes in Diabetic Condition. Photochem Photobiol 2021; 98:1122-1130. [PMID: 34931322 PMCID: PMC9511213 DOI: 10.1111/php.13583] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Accepted: 12/14/2021] [Indexed: 12/17/2022]
Abstract
Ultraviolet B (UVB) stimulates the generation of extracellular vesicles, which elicit systemic effects. Here, we studied whether UVB affects the release and microRNA (miR) content of keratinocyte exosomes (EXs) in diabetic conditions. In vitro, we examined the UVB effects on affecting EX release from keratinocyte HaCaT cells (HaCaT‐EX) pretreated with high glucose. HaCaT‐EX functions were evaluated on Schwann cells (SCs). In vivo, UVB‐induced miR change in skin EXs of diabetic db/db mice was analyzed. The miRs of interest were validated in HaCaT‐EXs. We found that: (1) UVB promoted HaCaT‐EX generation in dose‐ and time‐dependent manners; 100 and 1800 J m−2 of UVB had the most prominent effect and were selected as effective low‐ and high‐fluence UVB in vitro. (2) A total of 13 miRs were differentially expressed >3‐fold in skin EXs in UVB‐treated db/db mice; miR‐126 was the most up‐regulated by low‐fluence UVB. (3) Functional studies revealed that the SC viability was improved by low‐fluence UVB HaCaT‐EXs, while worsened by high‐fluence UVB HaCaT‐EXs. (4) MiR‐126 inhibitor attenuated the effects induced by low‐fluence UVB HaCaT‐EXs. Our data have demonstrated that low‐ and high‐fluence UVBs promote HaCaT‐EX generation but differentially affect exosomal miR levels and functions under diabetic conditions.
Collapse
Affiliation(s)
- Jinju Wang
- Department of Biomedical Sciences, Joan C Edwards School of Medicine, Marshall University, Huntington, WV, USA
| | - Kartheek Pothana
- Department of Pharmacology and Toxicology, Boonshoft School of Medicine, Wright State University, Dayton, OH, USA
| | - Shuzhen Chen
- Department of Biomedical Sciences, Joan C Edwards School of Medicine, Marshall University, Huntington, WV, USA
| | - Harshal Sawant
- Department of Biomedical Sciences, Joan C Edwards School of Medicine, Marshall University, Huntington, WV, USA
| | - Jeffrey B Travers
- Department of Pharmacology and Toxicology, Boonshoft School of Medicine, Wright State University, Dayton, OH, USA.,The Dayton V.A. Medical Center, Dayton, OH, USA
| | - Ji Bihl
- Department of Biomedical Sciences, Joan C Edwards School of Medicine, Marshall University, Huntington, WV, USA
| | - Yanfang Chen
- Department of Pharmacology and Toxicology, Boonshoft School of Medicine, Wright State University, Dayton, OH, USA
| |
Collapse
|
14
|
Koufakis T, Mustafa OG, Zebekakis P, Kotsa K. Re: "Clinical Recommendations for High Altitude Exposure of Individuals with Pre-Existing Cardiovascular Conditions: A Joint Statement by the European Society of Cardiology, the Council on Hypertension of the European Society of Cardiology, the European Society of Hypertension, the International Society of Mountain Medicine, the Italian Society of Hypertension and the Italian Society of Mountain Medicine" by Parati et al. High Alt Med Biol 2021; 23:100-102. [PMID: 34935457 DOI: 10.1089/ham.2021.0150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Theocharis Koufakis
- Division of Endocrinology and Metabolism and Diabetes Center, First Department of Internal Medicine, Medical School, Aristotle University of Thessaloniki, AHEPA University Hospital, Thessaloniki, Greece
| | - Omar G Mustafa
- Department of Diabetes, King's College Hospital, London, United Kingdom
| | - Pantelis Zebekakis
- Division of Endocrinology and Metabolism and Diabetes Center, First Department of Internal Medicine, Medical School, Aristotle University of Thessaloniki, AHEPA University Hospital, Thessaloniki, Greece
| | - Kalliopi Kotsa
- Division of Endocrinology and Metabolism and Diabetes Center, First Department of Internal Medicine, Medical School, Aristotle University of Thessaloniki, AHEPA University Hospital, Thessaloniki, Greece
| |
Collapse
|
15
|
Valle M, Mitchell PL, Pilon G, Varin T, Hénault L, Rolin J, McLeod R, Gill T, Richard D, Vohl MC, Jacques H, Gagnon C, Bazinet L, Marette A. Salmon peptides limit obesity-associated metabolic disorders by modulating a gut-liver axis in vitamin D-deficient mice. Obesity (Silver Spring) 2021; 29:1635-1649. [PMID: 34449134 DOI: 10.1002/oby.23244] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 05/27/2021] [Accepted: 05/27/2021] [Indexed: 11/06/2022]
Abstract
OBJECTIVE This study investigated the effects of a low-dose salmon peptide fraction (SPF) and vitamin D3 (VitD3 ) in obese and VitD3 -deficient mice at risk of metabolic syndrome (MetS). METHODS Obese and VitD3 -deficient low-density lipoprotein receptor (LDLr)-/- /apolipoprotein B100 (ApoB)100/100 mice were treated with high-fat high-sucrose diets, with 25% of dietary proteins replaced by SPF or a nonfish protein mix (MP). The SPF and MP groups received a VitD3 -deficient diet or a supplementation of 15,000 IU of VitD3 per kilogram of diet. Glucose homeostasis, atherosclerosis, nonalcoholic fatty liver disease, and gut health were assessed. RESULTS VitD3 supplementation increased plasma 25-hydroxyvitamin D to optimal status whereas the VitD3 -deficient diet maintained moderate deficiency. SPF-treated groups spent more energy and accumulated less visceral fat in association with an improved adipokine profile. SPF lowered homeostatic model assessment of insulin resistance compared with MP, suggesting that SPF can improve insulin sensitivity. SPF alone blunted hepatic and colonic inflammation, whereas VitD3 supplementation attenuated ileal inflammation. These effects were associated with changes in gut microbiota such as increased Mogibacterium and Muribaculaceae. CONCLUSIONS SPF treatment improves MetS by modulating hepatic and gut inflammation along with gut microbiota, suggesting that SPF operates through a gut-liver axis. VitD3 supplementation has limited influence on MetS in this model.
Collapse
Affiliation(s)
- Marion Valle
- Faculty of Medicine, Québec Heart and Lung Institute, Laval University, Québec City, Québec, Canada
- Institute of Nutrition and Functional Foods, Laval University, Québec City, Québec, Canada
| | - Patricia L Mitchell
- Faculty of Medicine, Québec Heart and Lung Institute, Laval University, Québec City, Québec, Canada
- Institute of Nutrition and Functional Foods, Laval University, Québec City, Québec, Canada
| | - Geneviève Pilon
- Faculty of Medicine, Québec Heart and Lung Institute, Laval University, Québec City, Québec, Canada
- Institute of Nutrition and Functional Foods, Laval University, Québec City, Québec, Canada
| | - Thibault Varin
- Faculty of Medicine, Québec Heart and Lung Institute, Laval University, Québec City, Québec, Canada
- Institute of Nutrition and Functional Foods, Laval University, Québec City, Québec, Canada
| | - Loïc Hénault
- Institute of Nutrition and Functional Foods, Laval University, Québec City, Québec, Canada
- Department of Food Sciences, Laboratory of Food Processing and ElectroMembrane Processes, Laval University, Québec City, Québec, Canada
| | - Jonathan Rolin
- Process Engineering and Applied Science, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Roger McLeod
- Department of Biochemistry and Molecular Biology, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Tom Gill
- Process Engineering and Applied Science, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Denis Richard
- Faculty of Medicine, Québec Heart and Lung Institute, Laval University, Québec City, Québec, Canada
| | - Marie-Claude Vohl
- Institute of Nutrition and Functional Foods, Laval University, Québec City, Québec, Canada
- School of Nutrition, Laval University, Québec, Québec, Canada
| | - Hélène Jacques
- Institute of Nutrition and Functional Foods, Laval University, Québec City, Québec, Canada
- School of Nutrition, Laval University, Québec, Québec, Canada
| | - Claudia Gagnon
- Faculty of Medicine, Québec Heart and Lung Institute, Laval University, Québec City, Québec, Canada
- Institute of Nutrition and Functional Foods, Laval University, Québec City, Québec, Canada
- Endocrinology and Nephrology Unit, CHU de Québec Research Centre, Québec City, Québec, Canada
| | - Laurent Bazinet
- Institute of Nutrition and Functional Foods, Laval University, Québec City, Québec, Canada
- Department of Food Sciences, Laboratory of Food Processing and ElectroMembrane Processes, Laval University, Québec City, Québec, Canada
| | - André Marette
- Faculty of Medicine, Québec Heart and Lung Institute, Laval University, Québec City, Québec, Canada
- Institute of Nutrition and Functional Foods, Laval University, Québec City, Québec, Canada
| |
Collapse
|
16
|
Erem AS, Razzaque MS. Vitamin D-independent benefits of safe sunlight exposure. J Steroid Biochem Mol Biol 2021; 213:105957. [PMID: 34329737 DOI: 10.1016/j.jsbmb.2021.105957] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Revised: 07/15/2021] [Accepted: 07/25/2021] [Indexed: 01/10/2023]
Abstract
This review examines the beneficial effects of ultraviolet radiation on systemic autoimmune diseases, including multiple sclerosis and type I diabetes, where the epidemiological evidence for the vitamin D-independent effects of sunlight is most apparent. Ultraviolet radiation, in addition to its role in the synthesis of vitamin D, stimulates anti-inflammatory pathways, alters the composition of dendritic cells, T cells, and T regulatory cells, and induces nitric oxide synthase and heme oxygenase metabolic pathways, which may directly or indirectly mitigate disease progression and susceptibility. Recent work has also explored how the immune-modulating functions of ultraviolet radiation affect type II diabetes, cancer, and the current global pandemic caused by SARS-CoV-2. These diseases are particularly important amidst global changes in lifestyle that result in unhealthy eating, increased sedentary habits, and alcohol and tobacco consumption. Compelling epidemiological data shows increased ultraviolet radiation associated with reduced rates of certain cancers, such as colorectal cancer, breast cancer, non-Hodgkins lymphoma, and ultraviolet radiation exposure correlated with susceptibility and mortality rates of COVID-19. Therefore, understanding the effects of ultraviolet radiation on both vitamin D-dependent and -independent pathways is necessary to understand how they influence the course of many human diseases.
Collapse
Affiliation(s)
- Anna S Erem
- Department of Pathology, Emory University School of Medicine, Atlanta, GA, USA
| | - Mohammed S Razzaque
- Department of Pathology, Lake Erie College of Osteopathic Medicine, Erie, PA, USA.
| |
Collapse
|
17
|
Miller KM, Hart PH, Lucas RM, Davis EA, de Klerk NH. Higher ultraviolet radiation during early life is associated with lower risk of childhood type 1 diabetes among boys. Sci Rep 2021; 11:18597. [PMID: 34545118 PMCID: PMC8452739 DOI: 10.1038/s41598-021-97469-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Accepted: 08/19/2021] [Indexed: 02/08/2023] Open
Abstract
Population-level ecological studies show type 1 diabetes incidence is inversely correlated with ambient ultraviolet radiation (UVR) levels. We conducted a nested case-control study using administrative datasets to test this association at the individual level. Cases (n = 1819) were children born in Western Australia (WA) from 1980-2014, diagnosed with type 1 diabetes at ≤ 16 years. Controls (n = 27,259) were randomly selected from all live births in WA, matched to cases by sex and date of birth. Total ambient erythemal ultraviolet radiation (UVR) doses for each trimester of pregnancy and first year of life were estimated for each individual, using daily NASA satellite data that were date- and geographically-specific. Conditional logistic regression tested the association between UVR dose and case-control status. Type 1 diabetes risk was 42% lower in boys of mothers with third-trimester UVR dose in the highest (compared to the lowest) quartile (p = 0.04). Higher UVR in the first year of life was associated with lower type 1 diabetes risk among boys (p = 0.01). UVR dose was not associated with type 1 diabetes risk in girls. Higher UVR in late pregnancy and early life appear to interact with sex-specific factors to lower type 1 diabetes risk among boys in Western Australia.
Collapse
Affiliation(s)
- Kate M. Miller
- grid.414659.b0000 0000 8828 1230Telethon Kids Institute, Nedlands, 6009 Australia
| | - Prue H. Hart
- grid.414659.b0000 0000 8828 1230Telethon Kids Institute, Nedlands, 6009 Australia
| | - Robyn M. Lucas
- grid.1001.00000 0001 2180 7477National Centre for Epidemiology and Population Health, Research School of Population Health, Australian National University, Australian Capital Territory, 0200 Australia
| | - Elizabeth A. Davis
- grid.410667.20000 0004 0625 8600Perth Children’s Hospital, Nedlands, 6009 Australia
| | - Nicholas H. de Klerk
- grid.1012.20000 0004 1936 7910University of Western Australia, Crawley, 6009 Australia
| |
Collapse
|
18
|
Jara CP, de Andrade Berti B, Mendes NF, Engel DF, Zanesco AM, Pereira de Souza GF, de Medeiros Bezerra R, de Toledo Bagatin J, Maria-Engler SS, Morari J, Velander WH, Velloso LA, Araújo EP. Glutamic acid promotes hair growth in mice. Sci Rep 2021; 11:15453. [PMID: 34326383 PMCID: PMC8322389 DOI: 10.1038/s41598-021-94816-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2020] [Accepted: 07/14/2021] [Indexed: 02/07/2023] Open
Abstract
Glutamic acid is the main excitatory neurotransmitter acting both in the brain and in peripheral tissues. Abnormal distribution of glutamic acid receptors occurs in skin hyperproliferative conditions such as psoriasis and skin regeneration; however, the biological function of glutamic acid in the skin remains unclear. Using ex vivo, in vivo and in silico approaches, we showed that exogenous glutamic acid promotes hair growth and keratinocyte proliferation. Topical application of glutamic acid decreased the expression of genes related to apoptosis in the skin, whereas glutamic acid increased cell viability and proliferation in human keratinocyte cultures. In addition, we identified the keratinocyte glutamic acid excitotoxic concentration, providing evidence for the existence of a novel skin signalling pathway mediated by a neurotransmitter that controls keratinocyte and hair follicle proliferation. Thus, glutamic acid emerges as a component of the peripheral nervous system that acts to control cell growth in the skin. These results raise the perspective of the pharmacological and nutritional use of glutamic acid to treat skin diseases.
Collapse
Affiliation(s)
- Carlos Poblete Jara
- Faculty of Nursing, University of Campinas, UNICAMP, Tessalia Vieira de Camargo St., 126, Campinas, SP, 13083-887, Brazil.
- Laboratory of Cell Signalling, Obesity and Comorbidities Research Center, University of Campinas, UNICAMP, Campinas, Brazil.
- University of Campinas, Campinas, Brazil.
- Department of Chemical and Biomolecular Engineering, University of Nebraska, Lincoln, NE, USA.
| | - Beatriz de Andrade Berti
- Faculty of Nursing, University of Campinas, UNICAMP, Tessalia Vieira de Camargo St., 126, Campinas, SP, 13083-887, Brazil
- Laboratory of Cell Signalling, Obesity and Comorbidities Research Center, University of Campinas, UNICAMP, Campinas, Brazil
- University of Campinas, Campinas, Brazil
| | - Natália Ferreira Mendes
- Faculty of Nursing, University of Campinas, UNICAMP, Tessalia Vieira de Camargo St., 126, Campinas, SP, 13083-887, Brazil
- Laboratory of Cell Signalling, Obesity and Comorbidities Research Center, University of Campinas, UNICAMP, Campinas, Brazil
- University of Campinas, Campinas, Brazil
| | - Daiane Fátima Engel
- Faculty of Medical Sciences, University of Campinas, UNICAMP, Campinas, Brazil
- Laboratory of Cell Signalling, Obesity and Comorbidities Research Center, University of Campinas, UNICAMP, Campinas, Brazil
- University of Campinas, Campinas, Brazil
| | - Ariane Maria Zanesco
- Faculty of Medical Sciences, University of Campinas, UNICAMP, Campinas, Brazil
- Laboratory of Cell Signalling, Obesity and Comorbidities Research Center, University of Campinas, UNICAMP, Campinas, Brazil
- University of Campinas, Campinas, Brazil
| | - Gabriela Freitas Pereira de Souza
- Department of Organic Chemistry, Institute of Chemistry, University of Campinas, UNICAMP, Campinas, Brazil
- University of Campinas, Campinas, Brazil
| | - Renan de Medeiros Bezerra
- Faculty of Nursing, University of Campinas, UNICAMP, Tessalia Vieira de Camargo St., 126, Campinas, SP, 13083-887, Brazil
- Laboratory of Cell Signalling, Obesity and Comorbidities Research Center, University of Campinas, UNICAMP, Campinas, Brazil
- University of Campinas, Campinas, Brazil
| | - Julia de Toledo Bagatin
- School of Pharmaceutical Sciences, Clinical Chemistry and Toxicology Department, University of São Paulo, São Paulo, Brazil
| | - Silvya Stuchi Maria-Engler
- School of Pharmaceutical Sciences, Clinical Chemistry and Toxicology Department, University of São Paulo, São Paulo, Brazil
| | - Joseane Morari
- Faculty of Medical Sciences, University of Campinas, UNICAMP, Campinas, Brazil
- Laboratory of Cell Signalling, Obesity and Comorbidities Research Center, University of Campinas, UNICAMP, Campinas, Brazil
- University of Campinas, Campinas, Brazil
| | - William H Velander
- Department of Chemical and Biomolecular Engineering, University of Nebraska, Lincoln, NE, USA
| | - Lício A Velloso
- Faculty of Medical Sciences, University of Campinas, UNICAMP, Campinas, Brazil
- Laboratory of Cell Signalling, Obesity and Comorbidities Research Center, University of Campinas, UNICAMP, Campinas, Brazil
- University of Campinas, Campinas, Brazil
| | - Eliana Pereira Araújo
- Faculty of Nursing, University of Campinas, UNICAMP, Tessalia Vieira de Camargo St., 126, Campinas, SP, 13083-887, Brazil
- Laboratory of Cell Signalling, Obesity and Comorbidities Research Center, University of Campinas, UNICAMP, Campinas, Brazil
- University of Campinas, Campinas, Brazil
| |
Collapse
|
19
|
Cherrie M, Clemens T, Colandrea C, Feng Z, Webb DJ, Weller RB, Dibben C. Ultraviolet A radiation and COVID-19 deaths in the USA with replication studies in England and Italy. Br J Dermatol 2021; 185:363-370. [PMID: 33834487 PMCID: PMC8251104 DOI: 10.1111/bjd.20093] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/29/2021] [Indexed: 12/27/2022]
Abstract
Background Understanding factors impacting deaths from COVID‐19 is of the highest priority. Seasonal variation in environmental meteorological conditions affects the incidence of many infectious diseases and may also affect COVID‐19. Ultraviolet (UV) A (UVA) radiation induces release of cutaneous photolabile nitric oxide (NO) impacting the cardiovascular system and metabolic syndrome, both COVID‐19 risk factors. NO also inhibits the replication of SARS‐CoV2. Objectives To investigate the relationship between ambient UVA radiation and COVID‐19 deaths. Methods COVID‐19 deaths at the county level, across the USA, were modelled in a zero‐inflated negative‐binomial model with a random effect for states adjusting for confounding by demographic, socioeconomic and long‐term environmental variables. Only those areas where UVB was too low to induce significant cutaneous vitamin D3 synthesis were modelled. We used satellite‐derived estimates of UVA, UVB and temperature and relative humidity. Replication models were undertaken using comparable data for England and Italy. Results The mortality rate ratio (MRR) in the USA falls by 29% [95% confidence interval (CI) 40% to 15%) per 100 kJ m–2 increase in mean daily UVA. We replicated this in independent studies in Italy and England and estimate a pooled decline in MRR of 32% (95% CI 48% to 12%) per 100 kJ m–2 across the three studies. Conclusions Our analysis suggests that higher ambient UVA exposure is associated with lower COVID‐19‐specific mortality. Further research on the mechanism may indicate novel treatments. Optimized UVA exposure may have population health benefits.
Collapse
Affiliation(s)
- M Cherrie
- School of Geosciences, University of Edinburgh, Edinburgh, UK
| | - T Clemens
- School of Geosciences, University of Edinburgh, Edinburgh, UK
| | - C Colandrea
- School of Geosciences, University of Edinburgh, Edinburgh, UK
| | - Z Feng
- School of Geosciences, University of Edinburgh, Edinburgh, UK
| | - D J Webb
- Centre for Cardiovascular Science, University of Edinburgh, Edinburgh, UK
| | - R B Weller
- Centre for Inflammation Research, University of Edinburgh, Edinburgh, UK
| | - C Dibben
- School of Geosciences, University of Edinburgh, Edinburgh, UK
| |
Collapse
|
20
|
Mincham KT, Panchal K, Hart PH, Lucas RM, Feelisch M, Weller RB, Matthews VB, Strickland DH, Gorman S. Metabolic dysfunction induced by a high-fat diet modulates hematopoietic stem and myeloid progenitor cells in brown adipose tissue of mice. Immunol Cell Biol 2021; 99:749-766. [PMID: 33866598 DOI: 10.1111/imcb.12460] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Revised: 02/05/2021] [Accepted: 04/15/2021] [Indexed: 11/29/2022]
Abstract
Brown adipose tissue (BAT) may be an important metabolic regulator of whole-body glucose. While important roles have been ascribed to macrophages in regulating metabolic functions in BAT, little is known of the roles of other immune cells subsets, particularly dendritic cells (DCs). Eating a high-fat diet may compromise the development of hematopoietic stem and progenitor cells (HSPCs)-which give rise to DCs-in bone marrow, with less known of its effects in BAT. We have previously demonstrated that ongoing exposure to low-dose ultraviolet radiation (UVR) significantly reduced the 'whitening' effect of eating a high-fat diet upon interscapular (i) BAT of mice. Here, we examined whether this observation may be linked to changes in the phenotype of HSPCs and myeloid-derived immune cells in iBAT and bone marrow of mice using 12-colour flow cytometry. Many HSPC subsets declined in both iBAT and bone marrow with increasing metabolic dysfunction. Conversely, with rising adiposity and metabolic dysfunction, conventional DCs (cDCs) increased in both of these tissues. When compared with a low-fat diet, consumption of a high-fat diet significantly reduced proportions of myeloid, common myeloid and megakaryocyte-erythrocyte progenitors in iBAT, and short-term hematopoietic stem cells in bone marrow. In mice fed the high-fat diet, exposure to low-dose UVR significantly reduced proportions of cDCs in iBAT, independently of nitric oxide release from irradiated skin [blocked using the scavenger 2-(4-carboxyphenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide potassium salt (cPTIO)], but did not significantly modify HSPC subsets in either tissue. Further studies are needed to determine whether changes in these cell populations contribute towards metabolic dysfunction .
Collapse
Affiliation(s)
- Kyle T Mincham
- Telethon Kids Institute, University of Western Australia, Perth, Australia
| | - Kunjal Panchal
- Telethon Kids Institute, University of Western Australia, Perth, Australia
| | - Prue H Hart
- Telethon Kids Institute, University of Western Australia, Perth, Australia
| | - Robyn M Lucas
- National Centre for Epidemiology and Population Health, Research School of Population Health, Australian National University, Canberra, Australian Capital Territory, Australia.,Centre for Ophthalmology and Visual Science, University of Western Australia, Perth, Australia
| | - Martin Feelisch
- Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, Southampton General Hospital, Southampton, UK
| | - Richard B Weller
- University of Edinburgh, MRC Centre for Inflammation Research, Edinburgh, Scotland
| | - Vance B Matthews
- School of Biomedical Science - Royal Perth Hospital Unit, The University of Western Australia, Perth, Australia
| | | | - Shelley Gorman
- Telethon Kids Institute, University of Western Australia, Perth, Australia
| |
Collapse
|
21
|
Moattari CR, Granstein RD. Neuropeptides and neurohormones in immune, inflammatory and cellular responses to ultraviolet radiation. Acta Physiol (Oxf) 2021; 232:e13644. [PMID: 33724698 DOI: 10.1111/apha.13644] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2020] [Revised: 02/26/2021] [Accepted: 03/02/2021] [Indexed: 12/16/2022]
Abstract
Humans are exposed to varying amounts of ultraviolet radiation (UVR) through sunlight. UVR penetrates into human skin leading to release of neuropeptides, neurotransmitters and neuroendocrine hormones. These messengers released from local sensory nerves, keratinocytes, Langerhans cells (LCs), mast cells, melanocytes and endothelial cells (ECs) modulate local and systemic immune responses, mediate inflammation and promote differing cell biologic effects. In this review, we will focus on both animal and human studies that elucidate the roles of calcitonin gene-related peptide (CGRP), substance P (SP), nerve growth factor (NGF), nitric oxide and proopiomelanocortin (POMC) derivatives in mediating immune and inflammatory effects of exposure to UVR as well as other cell biologic effects of UVR exposure.
Collapse
|
22
|
Valle M, Mitchell PL, Pilon G, St-Pierre P, Varin T, Richard D, Vohl MC, Jacques H, Delvin E, Levy E, Gagnon C, Bazinet L, Marette A. Cholecalciferol Supplementation Does Not Prevent the Development of Metabolic Syndrome or Enhance the Beneficial Effects of Omega-3 Fatty Acids in Obese Mice. J Nutr 2021; 151:1175-1189. [PMID: 33851198 PMCID: PMC8112766 DOI: 10.1093/jn/nxab002] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2020] [Revised: 10/30/2020] [Accepted: 01/04/2021] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND Cholecalciferol (D3) may improve inflammation, and thus provide protection from cardiometabolic diseases (CMD), although controversy remains. Omega-3 fatty acids (ω-3FA) may also prevent the development of CMD, but the combined effects of ω-3FA and D3 are not fully understood. OBJECTIVES We determined the chronic independent and combined effects of D3 and ω-3FA on body weight, glucose homeostasis, and markers of inflammation in obese mice. METHODS We gave 8-week-old male C57BL/6J mice, which had been fed a high-fat, high-sucrose (HF) diet (65.5% kcal fat, 19.8% kcal carbohydrate, and 14% kcal protein) for 12 weeks, either a standard D3 dose (+SD3; 1400 IU D3/kg diet) or a high D3 dose (+HD3; 15,000 IU D3/kg diet). We fed 1 +SD3 group and 1 +HD3 group with 4.36% (w/w) fish oil (+ω-3FA; 44% eicosapentaenoic acid, 25% docosahexaenoic acid), and fed the other 2 groups with corn oil [+omega-6 fatty acids (ω-6FA)]. A fifth group was fed a low-fat (LF; 15.5% kcal) diet. LF and HF+ω-6+SD3 differences were tested by a Student's t-test and HF treatment differences were tested by a 2-way ANOVA. RESULTS D3 supplementation in the +HD3 groups did not significantly increase plasma total 25-hydroxyvitamin D and 25-hydroxyvitamin D3 [25(OH)D3] versus the +SD3 groups, but it increased 3-epi-25-hydroxyvitamin D3 levels by 3.4 ng/mL in the HF+ω-6+HD3 group and 4.0 ng/mL in the HF+ω-3+HD3 group, representing 30% and 70%, respectively, of the total 25(OH)D3 increase. Energy expenditure increased in those mice fed diets +ω-3FA, by 3.9% in the HF+ω-3+SD3 group and 7.4% in the HF+ω-3+HD3 group, but it did not translate into lower body weight. The glucose tolerance curves of the HF+ω-3+SD3 and HF+ω-3+HD3 groups were improved by 11% and 17%, respectively, as compared to the respective +ω-6FA groups. D3 supplementation, within the ω-3FA groups, altered the gut microbiota by increasing the abundance of S24-7 and Lachnospiraceae taxa compared to the standard dose, while within the ω-6FA groups, D3 supplementation did not modulate specific taxa. CONCLUSIONS Overall, D3 supplementation does not prevent CMD or enhance the beneficial effects of ω-3FA in vitamin D-sufficient obese mice.
Collapse
Affiliation(s)
- Marion Valle
- Québec Heart and Lung Institute Research Centre, Faculty of Medicine, Laval University, Québec City, QC, Canada,Institute of Nutrition and Functional Foods, Laval University, Québec City, QC, Canada
| | - Patricia L Mitchell
- Québec Heart and Lung Institute Research Centre, Faculty of Medicine, Laval University, Québec City, QC, Canada,Institute of Nutrition and Functional Foods, Laval University, Québec City, QC, Canada
| | - Geneviève Pilon
- Québec Heart and Lung Institute Research Centre, Faculty of Medicine, Laval University, Québec City, QC, Canada,Institute of Nutrition and Functional Foods, Laval University, Québec City, QC, Canada
| | - Philippe St-Pierre
- Québec Heart and Lung Institute Research Centre, Faculty of Medicine, Laval University, Québec City, QC, Canada,Institute of Nutrition and Functional Foods, Laval University, Québec City, QC, Canada
| | - Thibault Varin
- Québec Heart and Lung Institute Research Centre, Faculty of Medicine, Laval University, Québec City, QC, Canada,Institute of Nutrition and Functional Foods, Laval University, Québec City, QC, Canada
| | - Denis Richard
- Québec Heart and Lung Institute Research Centre, Faculty of Medicine, Laval University, Québec City, QC, Canada,Department of Medicine, Laval University, Québec City, QC, Canada
| | - Marie-Claude Vohl
- Institute of Nutrition and Functional Foods, Laval University, Québec City, QC, Canada,School of Nutrition, Laval University, Québec, QC, Canada
| | - Hélène Jacques
- Institute of Nutrition and Functional Foods, Laval University, Québec City, QC, Canada,School of Nutrition, Laval University, Québec, QC, Canada
| | - Edgar Delvin
- Department of Nutrition and Biochemistry, Sainte Justine Hospital Research Centre, University of Montreal, Montreal, QC, Canada
| | - Emile Levy
- Institute of Nutrition and Functional Foods, Laval University, Québec City, QC, Canada,Department of Nutrition and Biochemistry, Sainte Justine Hospital Research Centre, University of Montreal, Montreal, QC, Canada
| | - Claudia Gagnon
- Québec Heart and Lung Institute Research Centre, Faculty of Medicine, Laval University, Québec City, QC, Canada,Institute of Nutrition and Functional Foods, Laval University, Québec City, QC, Canada,Department of Medicine, Laval University, Québec City, QC, Canada,Endocrinology and Nephrology Unit, Centre hospitalier universitaire de Québec Research Centre, Québec City, QC, Canada
| | - Laurent Bazinet
- Institute of Nutrition and Functional Foods, Laval University, Québec City, QC, Canada,Department of Food Sciences, Laboratory of Food Processing and ElectroMembrane Processes, Laval University, Québec City, QC, Canada
| | | |
Collapse
|
23
|
Pace NP, Vassallo J, Calleja-Agius J. Gestational diabetes, environmental temperature and climate factors - From epidemiological evidence to physiological mechanisms. Early Hum Dev 2021; 155:105219. [PMID: 33046275 DOI: 10.1016/j.earlhumdev.2020.105219] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Gestational diabetes (GDM) is a common metabolic complication of pregnancy that is generally asymptomatic in its clinical course, although it is potentially associated with a wide range of both maternal and foetal complications. The population prevalence of GDM varies widely, depending on the clinical diagnostic criteria, ethnicity, demographics and background prevalence of type 2 diabetes. Climate variability and environmental temperature have recently come to the forefront as potential direct or indirect determinants of human health. The association between GDM and environmental temperature is complex, and studies have often reported conflicting findings. Epidemiologic studies have shown a direct relation between rising environmental temperature and the risk of both GDM and impaired beta cell function. Seasonal trends in the prevalence of GDM have been reported in several populations, with a higher prevalence in summer months. Multiple mechanisms have been proposed to explain the GDM-temperature correlation. A growing body of evidence supports a link between temperature, energy expenditure and adipose tissue metabolism. Brown adipose tissue thermogenesis, induced by cold temperatures, improves insulin sensitivity. Further biological explanations for the GDM-temperature correlation lie in potential association with low vitamin D levels, which varies according to sunshine exposure. Observational studies are also complicated by lifestyle factors, such as diet and physical activity, that could exhibit seasonal variation. In this review article, we provide a systematic overview of available epidemiological evidence linking environmental temperature and gestational diabetes. Furthermore, the physiological mechanisms that give biological plausibility to association between GDM and temperature are explored. As future climate patterns could drive global changes in GDM prevalence, this knowledge has important implications for both clinicians and researchers.
Collapse
Affiliation(s)
- Nikolai Paul Pace
- Department of Anatomy, Faculty of Medicine and Surgery, Biomedical Sciences Building, University of Malta, Msida MSD 2080, Malta.
| | - Josanne Vassallo
- Department of Medicine, Faculty of Medicine and Surgery, Biomedical Sciences Building, University of Malta, Msida MSD 2080, Malta
| | - Jean Calleja-Agius
- Department of Anatomy, Faculty of Medicine and Surgery, Biomedical Sciences Building, University of Malta, Msida MSD 2080, Malta
| |
Collapse
|
24
|
Gorman S, Weller RB. Investigating the Potential for Ultraviolet Light to Modulate Morbidity and Mortality From COVID-19: A Narrative Review and Update. Front Cardiovasc Med 2020; 7:616527. [PMID: 33426009 PMCID: PMC7786057 DOI: 10.3389/fcvm.2020.616527] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Accepted: 11/26/2020] [Indexed: 12/16/2022] Open
Abstract
During the COVID-19 (coronavirus disease of 2019) pandemic, researchers have been seeking low-cost and accessible means of providing protection from its harms, particularly for at-risk individuals such as those with cardiovascular disease, diabetes and obesity. One possible way is via safe sun exposure, and/or dietary supplementation with induced beneficial mediators (e.g., vitamin D). In this narrative review, we provide rationale and updated evidence on the potential benefits and harms of sun exposure and ultraviolet (UV) light that may impact COVID-19. We review recent studies that provide new evidence for any benefits (or otherwise) of UV light, sun exposure, and the induced mediators, vitamin D and nitric oxide, and their potential to modulate morbidity and mortality induced by infection with SARS-CoV-2 (severe acute respiratory disease coronavirus-2). We identified substantial interest in this research area, with many commentaries and reviews already published; however, most of these have focused on vitamin D, with less consideration of UV light (or sun exposure) or other mediators such as nitric oxide. Data collected to-date suggest that ambient levels of both UVA and UVB may be beneficial for reducing severity or mortality due to COVID-19, with some inconsistent findings. Currently unresolved are the nature of the associations between blood 25-hydroxyvitamin D and COVID-19 measures, with more prospective data needed that better consider lifestyle factors, such as physical activity and personal sun exposure levels. Another short-coming has been a lack of measurement of sun exposure, and its potential to influence COVID-19 outcomes. We also discuss possible mechanisms by which sun exposure, UV light and induced mediators could affect COVID-19 morbidity and mortality, by focusing on likely effects on viral pathogenesis, immunity and inflammation, and potential cardiometabolic protective mechanisms. Finally, we explore potential issues including the impacts of exposure to high dose UV radiation on COVID-19 and vaccination, and effective and safe doses for vitamin D supplementation.
Collapse
Affiliation(s)
- Shelley Gorman
- Telethon Kids Institute, University of Western Australia, Perth, WA, Australia
| | - Richard B. Weller
- Centre for Inflammation Research, University of Edinburgh, Edinburgh, United Kingdom
| |
Collapse
|
25
|
Vitamin D and blood pressure control among hypertensive adults: results from NHANES 2001-2014. J Hypertens 2020; 38:150-158. [PMID: 31503133 DOI: 10.1097/hjh.0000000000002231] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
OBJECTIVE Observational evidence supports an inverse association between hypovitaminosis D and blood pressure (BP), but intervention data have failed to demonstrate beneficial effects of vitamin D supplementation on BP. Following the downwards redefinition of hypertension treatment targets and the need to better identify individuals at greater risk for uncontrolled BP, our aim was to test the association of serum vitamin D levels with the definition of uncontrolled BP according to European guidelines in treated hypertensive adults. METHODS We retrospectively analyzed cross-sectional, nationally representative data from treated hypertensive adults aged at least 18 years with available serum 25 (OH)D measurements. BP was examined as continuous (mmHg) and categorical (at or above treatment goal, as recommended by guidelines) variable; BP means and odds ratios for uncontrolled BP according to vitamin D levels were calculated using progressively adjusted models. RESULTS Treated hypertensive adults with vitamin D deficiency had higher mean BP (+2.4/3.5 mmHg; P < 0.01) and 25-29% higher risk of uncontrolled BP compared to those with vitamin levels at least 75 nmol/l. These results were confirmed across age, sex, and racial/ethnic strata. Vitamin D insufficiency was associated with higher BP by 0.5/2.4 mmHg, but not with an increased risk of uncontrolled hypertension. CONCLUSIONS 25 (OH)D levels might indicate host-specific features related to poor BP control. The attempt to use a biomarker of exposure as an indicator of need for treatment risks to be misleading.
Collapse
|
26
|
Eveleens Maarse BC, Loh NY, Karpe F, Rosendaal FR, van Heemst D, Mook-Kanamori DO, Willems van Dijk K, Rensen PCN, Kooijman S, Christodoulides C, Noordam R. Associations between outdoor temperature and bright sunlight with metabolites in two population-based European cohorts. Nutr Metab Cardiovasc Dis 2020; 30:2252-2261. [PMID: 32912789 DOI: 10.1016/j.numecd.2020.07.030] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/14/2020] [Revised: 07/19/2020] [Accepted: 07/20/2020] [Indexed: 01/13/2023]
Abstract
BACKGROUND AND AIMS Outdoor temperature and bright sunlight may directly and/or indirectly modulate systemic metabolism. We assessed the associations between outdoor temperature and bright sunlight duration with metabolomics. METHODS AND RESULTS Cross-sectional analyses were undertaken in non-diabetic individuals from the Oxford BioBank (OBB; N = 6368; mean age 47.0 years, males 44%) and the Netherlands Epidemiology of Obesity (NEO; N = 5916; mean age 55.6 years, males 43%) study. Data on mean outdoor bright sunlight and temperature were collected from local weather stations in the week prior to blood sampling. Fasting serum levels of 148 metabolites, including 14 lipoprotein subclasses, were measured using NMR spectroscopy. Linear regression analyses were performed to assess the associations between mean outdoor temperature and bright sunlight duration with metabolomics adjusted for age, sex, body mass index, season and either outdoor temperature or bright sunlight. A higher mean outdoor temperature was associated with increased serum concentrations of lipoprotein (sub)particles (β (SE) = 0.064 (0.018) SD per 5 °C, p = 5.03e-4) and certain amino acids such as phenylalanine (0.066 (0.016) SD, p = 6.44e-05) and leucine (0.111 (0.018) SD, p = 1.25e-09). In contrast, longer duration of bright sunlight was specifically associated with lower concentrations of very low-density lipoprotein (sub)particles (e.g., VLDL cholesterol (-0.024 (0.005) SD per 1-h bright sunlight, p = 8.06e-6)). The direction of effects was generally consistent between the OBB and NEO, although effect sizes were generally larger in the OBB. CONCLUSIONS Increased bright sunlight duration is associated with an improved metabolic profile whilst higher outdoor temperature may adversely impact cardiometabolic health.
Collapse
Affiliation(s)
- Boukje C Eveleens Maarse
- Department of Internal Medicine, Division of Endocrinology, Leiden University Medical Center, Leiden, the Netherlands
| | - Nellie Y Loh
- Oxford Centre for Diabetes, Endocrinology and Metabolism, Radcliffe Department of Medicine, University of Oxford, Oxford, UK
| | - Fredrik Karpe
- Oxford Centre for Diabetes, Endocrinology and Metabolism, Radcliffe Department of Medicine, University of Oxford, Oxford, UK; NIHR Oxford Biomedical Research Centre, OUH Foundation Trust, Oxford, UK
| | - Frits R Rosendaal
- Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, the Netherlands
| | - Diana van Heemst
- Department of Internal Medicine, Section of Gerontology and Geriatrics, Leiden University Medical Center, Leiden, the Netherlands
| | - Dennis O Mook-Kanamori
- Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, the Netherlands
| | - Ko Willems van Dijk
- Department of Internal Medicine, Division of Endocrinology, Leiden University Medical Center, Leiden, the Netherlands; Department of Human Genetics, Leiden University Medical Center, Leiden, the Netherlands
| | - Patrick C N Rensen
- Department of Internal Medicine, Division of Endocrinology, Leiden University Medical Center, Leiden, the Netherlands
| | - Sander Kooijman
- Department of Internal Medicine, Division of Endocrinology, Leiden University Medical Center, Leiden, the Netherlands; Oxford Centre for Diabetes, Endocrinology and Metabolism, Radcliffe Department of Medicine, University of Oxford, Oxford, UK
| | - Constantinos Christodoulides
- Oxford Centre for Diabetes, Endocrinology and Metabolism, Radcliffe Department of Medicine, University of Oxford, Oxford, UK.
| | - Raymond Noordam
- Department of Internal Medicine, Section of Gerontology and Geriatrics, Leiden University Medical Center, Leiden, the Netherlands.
| |
Collapse
|
27
|
Heiskanen V, Pfiffner M, Partonen T. Sunlight and health: shifting the focus from vitamin D3 to photobiomodulation by red and near-infrared light. Ageing Res Rev 2020; 61:101089. [PMID: 32464190 DOI: 10.1016/j.arr.2020.101089] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 05/10/2020] [Accepted: 05/14/2020] [Indexed: 12/14/2022]
Abstract
Both sun exposure and serum vitamin D levels have been associated with lower risks of all-cause mortality and chronic age-related diseases, e.g., cancer, diabetes and cardiovascular disease, in epidemiological studies. These associations have mainly been ascribed to beneficial effects of vitamin D. However, a vast body of randomized controlled trials (RCTs) and Mendelian randomization studies have failed to confirm any major health benefits from vitamin D supplementation. In this review, we present tentative evidence showing that red and near-infrared light, both being present in sunlight, could explain the associations between sunlight exposure and better health status. Body irradiation with red and near-infrared light, usually termed as photobiomodulation (PBM), has demonstrated beneficial effects in animal models of chronic diseases. Beyond this, preliminary evidence from RCTs suggest potential clinical benefit from PBM for chronic diseases. PBM is currently being investigated in many pre-registered clinical trials, results of which will eventually clarify the role of red and near-infrared light in the prevention and treatment of common age-related chronic diseases.
Collapse
|
28
|
Klinedinst BS, Meier NF, Larsen B, Wang Y, Yu S, Mochel JP, Le S, Wolf T, Pollpeter A, Pappas C, Wang Q, Allenspach K, Wang L, Russell D, Bennett DA, Willette AA. Walking in the Light: How History of Physical Activity, Sunlight, and Vitamin D Account for Body Fat-A UK Biobank Study. Obesity (Silver Spring) 2020; 28:1428-1437. [PMID: 32573118 PMCID: PMC7501143 DOI: 10.1002/oby.22852] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/23/2020] [Revised: 04/03/2020] [Accepted: 04/10/2020] [Indexed: 11/09/2022]
Abstract
OBJECTIVE The high prevalence of vitamin D deficiency and obesity drives the need for successful strategies that elevate vitamin D levels, prevent adipogenesis, and stimulate lipolysis. This study provides a theoretical model to evaluate how physical activity (PA) and sunlight exposure influence serum vitamin D levels and regional adiposity. This study hypothesized a posteriori that sunlight is associated with undifferentiated visceral adiposity by increasing the ratio of brown to white adipose tissue. METHODS Using 10-year longitudinal data, accelerometry, a sun-exposure questionnaire, and regional adiposity quantified by dual-energy x-ray absorptiometry imaging, a structural-equation mediation model of growth curves was constructed with a data-driven methodology. RESULTS Sunlight and PA conjointly increased serum vitamin D. Changes in vitamin D levels partially mediated how sunlight and PA impacted adiposity in visceral and subcutaneous regions within a subjective PA model. In an objective PA model, vitamin D was a mediator for subcutaneous regions only. Interestingly, sunlight was associated with less adiposity in subcutaneous regions but greater adiposity in visceral regions. CONCLUSIONS Sunlight and PA may increase vitamin D levels. For the first time, this study characterizes a positive association between sunlight and visceral adiposity. Further investigation and experimentation are necessary to clarify the physiological role of sunlight exposure on adipose tissue.
Collapse
Affiliation(s)
- Brandon S. Klinedinst
- Department of Food Science and Human Nutrition, Iowa State
University, Ames, IA
- Neuroscience Program, Iowa State University, Ames, IA
| | | | - Brittany Larsen
- Neuroscience Program, Iowa State University, Ames, IA
- Department of Biomedical Sciences, College of Veterinary
Medicine, Iowa State University, Ames, IA
| | - Yueying Wang
- Department of Statistics, Iowa State University, Ames,
IA
| | - Shan Yu
- Department of Statistics, Iowa State University, Ames,
IA
| | - Jonathan P. Mochel
- Department of Biomedical Sciences, College of Veterinary
Medicine, Iowa State University, Ames, IA
| | - Scott Le
- Department of Food Science and Human Nutrition, Iowa State
University, Ames, IA
| | - Tovah Wolf
- Department of Nutrition & Dietetics, Western Carolina
University, Cullowhee, NC
| | - Amy Pollpeter
- Bioinformatics & Computational Biology Program, Iowa
State University, Ames, IA
| | - Colleen Pappas
- Department of Food Science and Human Nutrition, Iowa State
University, Ames, IA
| | - Qian Wang
- Department of Food Science and Human Nutrition, Iowa State
University, Ames, IA
| | - Karin Allenspach
- Department of Veterinary Clinical Sciences, Iowa State
University, Ames, IA
| | - Li Wang
- Department of Statistics, Iowa State University, Ames,
IA
| | - Daniel Russell
- Department of Human Development & Family Studies, Iowa
State University, Ames, IA
| | - David A. Bennett
- Rush Alzheimer’s Disease Center, Rush University
Medical Center, Chicago, IL
| | - Auriel A. Willette
- Department of Food Science and Human Nutrition, Iowa State
University, Ames, IA
- Neuroscience Program, Iowa State University, Ames, IA
- Bioinformatics & Computational Biology Program, Iowa
State University, Ames, IA
- Department of Neurology, University of Iowa, Iowa City,
IA
| |
Collapse
|
29
|
Low energy irradiation of narrow-range UV-LED prevents osteosarcopenia associated with vitamin D deficiency in senescence-accelerated mouse prone 6. Sci Rep 2020; 10:11892. [PMID: 32681041 PMCID: PMC7368004 DOI: 10.1038/s41598-020-68641-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Accepted: 06/29/2020] [Indexed: 12/21/2022] Open
Abstract
Deficiency of vitamin D is an important cause of osteosarcopenia. The purpose of this study is to examine the effects of low energy narrow-range UV-LED on osteosarcopenia in animal models of senescence-accelerated mouse prone 6 (SAMP6). Preliminary experiments specified the minimum irradiance intensity and dose efficacy for vitamin D production (316 nm, 0.16 mW/cm2, 1,000 J/m2). we set a total of 4 groups (n = 8 per group); vitamin D-repletion without UV irradiation (Vit.D+UV-), vitamin D-repletion with UV irradiation (Vit.D+UV +), vitamin D-deficiency without UV irradiation, (Vit.D-UV-), and vitamin D-deficiency with UV irradiation (Vit.D-UV +). Serum levels of 25(OH)D at 28 and 36 weeks of age were increased in Vit.D-UV+ group as compared with Vit.D-UV- group. Trabecular bone mineral density on micro-CT was higher in Vit.D-UV+ group than in Vit.D-UV- group at 36 weeks of age. In the histological assay, fewer osteoclasts were observed in Vit.D-UV+ group than in Vit.D-UV- group. Grip strength and muscle mass were higher in Vit.D-UV+ group than in Vit.D-UV- group at 36 weeks of age. Signs of severe damage induced by UV irradiation was not found in skin histology. Low energy narrow-range UV irradiation may improve osteosarcopenia associated with vitamin D deficiency in SAMP6.
Collapse
|
30
|
Alfredsson L, Armstrong BK, Butterfield DA, Chowdhury R, de Gruijl FR, Feelisch M, Garland CF, Hart PH, Hoel DG, Jacobsen R, Lindqvist PG, Llewellyn DJ, Tiemeier H, Weller RB, Young AR. Insufficient Sun Exposure Has Become a Real Public Health Problem. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2020; 17:E5014. [PMID: 32668607 PMCID: PMC7400257 DOI: 10.3390/ijerph17145014] [Citation(s) in RCA: 57] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 07/01/2020] [Accepted: 07/04/2020] [Indexed: 12/13/2022]
Abstract
This article aims to alert the medical community and public health authorities to accumulating evidence on health benefits from sun exposure, which suggests that insufficient sun exposure is a significant public health problem. Studies in the past decade indicate that insufficient sun exposure may be responsible for 340,000 deaths in the United States and 480,000 deaths in Europe per year, and an increased incidence of breast cancer, colorectal cancer, hypertension, cardiovascular disease, metabolic syndrome, multiple sclerosis, Alzheimer's disease, autism, asthma, type 1 diabetes and myopia. Vitamin D has long been considered the principal mediator of beneficial effects of sun exposure. However, oral vitamin D supplementation has not been convincingly shown to prevent the above conditions; thus, serum 25(OH)D as an indicator of vitamin D status may be a proxy for and not a mediator of beneficial effects of sun exposure. New candidate mechanisms include the release of nitric oxide from the skin and direct effects of ultraviolet radiation (UVR) on peripheral blood cells. Collectively, this evidence indicates it would be wise for people living outside the tropics to ensure they expose their skin sufficiently to the sun. To minimize the harms of excessive sun exposure, great care must be taken to avoid sunburn, and sun exposure during high ambient UVR seasons should be obtained incrementally at not more than 5-30 min a day (depending on skin type and UV index), in season-appropriate clothing and with eyes closed or protected by sunglasses that filter UVR.
Collapse
Affiliation(s)
- Lars Alfredsson
- Institute of Environmental Medicine, Karolinska Institute, 171 77 Stockholm, Sweden;
| | - Bruce K. Armstrong
- School of Population and Global Health, The University of Western Australia, Perth 6009, Australia;
| | - D. Allan Butterfield
- Department of Chemistry and Sanders-Brown Center on Aging, University of Kentucky, Lexington, KY 40506, USA;
| | - Rajiv Chowdhury
- Cardiovascular Epidemiology Unit, Department of Public Health and Primary Care, University of Cambridge, Cambridge CB1 8RN, UK;
| | - Frank R. de Gruijl
- Department of Dermatology, Leiden University Medical Centre, 2333 ZA Leiden, The Netherlands;
| | - Martin Feelisch
- Clinical & Experimental Sciences, University of Southampton Medical School and University Hospital Southampton NHS Foundation Trust, Southampton SO16 6YD, UK;
| | - Cedric F. Garland
- Division of Epidemiology, Department of Family Medicine and Public Health, University of California San Diego School of Medicine, La Jolla, CA 92093, USA;
| | - Prue H. Hart
- Telethon Kids Institute, University of Western Australia, Perth 6872, Australia;
| | - David G. Hoel
- Department of Public Health Sciences, College of Medicine, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Ramune Jacobsen
- Department of Pharmacy, University of Copenhagen, DK-2100 Copenhagen, Denmark;
| | - Pelle G. Lindqvist
- Department of Clinical Science and Education, Karolinska Institute, 171 77 Stockholm, Sweden;
| | - David J. Llewellyn
- College of Medicine and Health, University of Exeter Medical School, Exeter EX1 2LU, UK;
| | - Henning Tiemeier
- Department of Social and Behavioral Science, Harvard T.H. Chan School of Public Health, Harvard University, Cambridge, MA 02115, USA;
| | - Richard B. Weller
- Centre for Inflammation Research, University of Edinburgh, Edinburgh EH16 4SB, UK;
| | - Antony R. Young
- St John’s Institute of Dermatology, King’s College London, London SE1 9RT, UK;
| |
Collapse
|
31
|
Ghaly S, Kaakoush NO, Hart PH. Effects of UVR exposure on the gut microbiota of mice and humans. Photochem Photobiol Sci 2020; 19:20-28. [PMID: 31930250 DOI: 10.1039/c9pp00443b] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Many alterations to the skin microbiome by exposure to UV radiation (UVR) have been postulated and may contribute to the ability of UVR phototherapy to regulate skin inflammatory diseases. Very recently, an effect of sub-erythemal narrowband UVB radiation (311 nm) on the gut microbiome of healthy individuals was reported. The relative abundance of Firmicutes and Proteobacteria increased in faecal samples of those receiving three exposures to narrowband UVB radiation; the Bacteroidetes phyla were reduced by UVB. In mice chronically exposed to sub-erythemal broadband UVR, similar faecal changes in Firmicutes and Bacteroidetes have been reported. Murine studies have allowed a further dissection of the relative ability of UVR and dietary vitamin D to modulate the gut microbiome by analysis of relative bacterial abundance in mice with similar 25-hydroxy vitamin D levels obtained by UVR exposure or from their diet, respectively. The studies of mice recovering from colitis suggested that dietary vitamin D could stimulate greater faecal abundance of Rikenellaceae, whilst exposure to UVR was necessary for changes to the abundance of Lachnospiraceae and Desulfovibrionaceae. Both human and murine studies report that multiple exposures to sub-erythemal UVR can increase the diversity of the gut microbiome, which in turn may be beneficial to the health of the host.
Collapse
Affiliation(s)
- Simon Ghaly
- Telethon Kids Institute, The University of Western Australia, Perth, WA, Australia.,Department of Gastroenterology and Hepatology, St. Vincent's Hospital, Sydney, NSW, Australia.,St. Vincent's Clinical School, Faculty of Medicine, UNSW Sydney, NSW, Australia
| | | | - Prue H Hart
- Telethon Kids Institute, The University of Western Australia, Perth, WA, Australia.
| |
Collapse
|
32
|
Effects of ultraviolet irradiation with a LED device on bone metabolism associated with vitamin D deficiency in senescence-accelerated mouse P6. Heliyon 2020; 6:e03499. [PMID: 32140604 PMCID: PMC7052073 DOI: 10.1016/j.heliyon.2020.e03499] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Revised: 12/13/2019] [Accepted: 02/24/2020] [Indexed: 12/31/2022] Open
Abstract
Aims This study investigated effects of narrow-range ultraviolet irradiation (UVR) by a new UV–LED device on vitamin D supply and changes of bone in senescence-accelerated mouse P6 (SAMP6) with vitamin D deficiency. Main methods We used female SAMP6 mice as a senile osteoporotic model. We set a total of 3 groups (n = 4 per group); D-UVR+ group (vitamin D deficient–dietary and UVR), D- (vitamin D deficient–dietary), and D+ groups (vitamin D contained–dietary). Mice in the D-UVR + group were UV–irradiated (305nm) with 1 kJ/m2 twice a week for 12 weeks from 20 to 32 weeks of age. Serum 25(OH)D, 1,25(OH)2D, and micro–computed tomography (CT) were assessed over time. Mechanical test, and histological assay were performed for femurs removed at 32 weeks of age. Key findings UVR increased both serum 25(OH)D and 1,25(OH)2D levels at 4 and 8 weeks–UVR in the D-UVR+ group compared with that in the D- group (P < 0.05, respectively). Relative levels of trabecular bone mineral density in micro–CT were higher in the D-UVR+ group than in the D- group at 8 weeks–UVR (P = 0.048). The ultimate load was significantly higher in the D-UVR+ group than in the D- group (P = 0.036). In histological assay, fewer osteoclasts and less immature bone (/mature bone) could be observed in the D-UVR+ group than in the D- group, significantly. Significance UVR may have possibility to improve bone metabolism associated with vitamin D deficiency in SAMP6 mice.
Collapse
|
33
|
Zhang H, Shen Z, Lin Y, Zhang J, Zhang Y, Liu P, Zeng H, Yu M, Chen X, Ning L, Mao X, Cen L, Yu C, Xu C. Vitamin D receptor targets hepatocyte nuclear factor 4α and mediates protective effects of vitamin D in nonalcoholic fatty liver disease. J Biol Chem 2020; 295:3891-3905. [PMID: 32051143 DOI: 10.1074/jbc.ra119.011487] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Revised: 02/07/2020] [Indexed: 02/06/2023] Open
Abstract
Epidemiological studies have suggested a link between vitamin D deficiency and increased risk for nonalcoholic fatty liver disease (NAFLD); however, the underlying mechanisms have remained unclear. Here, using both clinical samples and experimental rodent models along with several biochemical approaches, we explored the specific effects and mechanisms of vitamin D deficiency in NAFLD pathology. Serum vitamin D levels were significantly lower in individuals with NAFLD and in high-fat diet (HFD)-fed mice than in healthy controls and chow-fed mice, respectively. Vitamin D supplementation ameliorated HFD-induced hepatic steatosis and insulin resistance in mice. Hepatic expression of vitamin D receptor (VDR) was up-regulated in three models of NAFLD, including HFD-fed mice, methionine/choline-deficient diet (MCD)-fed mice, and genetically obese (ob/ob) mice. Liver-specific VDR deletion significantly exacerbated HFD- or MCD-induced hepatic steatosis and insulin resistance and also diminished the protective effect of vitamin D supplementation on NAFLD. Mechanistic experiments revealed that VDR interacted with hepatocyte nuclear factor 4 α (HNF4α) and that overexpression of HNF4α improved HFD-induced NAFLD and metabolic abnormalities in liver-specific VDR-knockout mice. These results suggest that vitamin D ameliorates NAFLD and metabolic abnormalities by activating hepatic VDR, leading to its interaction with HNF4α. Our findings highlight a potential value of using vitamin D for preventing and managing NAFLD by targeting VDR.
Collapse
Affiliation(s)
- Hong Zhang
- Department of Gastroenterology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China
| | - Zhe Shen
- Department of Gastroenterology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China
| | - Yiming Lin
- Department of Gastroenterology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China
| | - Jie Zhang
- Department of Gastroenterology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China
| | - Yuwei Zhang
- Department of Gastroenterology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China
| | - Peihao Liu
- Department of Gastroenterology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China
| | - Hang Zeng
- Department of Gastroenterology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China
| | - Mengli Yu
- Department of Gastroenterology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China
| | - Xueyang Chen
- Department of Gastroenterology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China
| | - Longgui Ning
- Department of Gastroenterology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China
| | - Xinli Mao
- Department of Gastroenterology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China.,Department of Gastroenterology, Taizhou Hospital of Zhejiang Province, Linhai 317000, China
| | - Li Cen
- Department of Gastroenterology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China
| | - Chaohui Yu
- Department of Gastroenterology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China
| | - Chengfu Xu
- Department of Gastroenterology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China
| |
Collapse
|
34
|
Public Health Implications of Solar UV Exposure during Extreme Cold and Hot Weather Episodes in 2018 in Chilton, South East England. JOURNAL OF ENVIRONMENTAL AND PUBLIC HEALTH 2020. [DOI: 10.1155/2020/2589601] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Consideration of the implications of solar UV exposure on public health during extreme temperature events is important due to their increasing frequency as a result of climate change. In this paper public health impacts of solar UV exposure, both positive and negative, during extreme hot and cold weather in England in 2018 were assessed by analysing environmental variations in UV and temperature. Consideration was given to people’s likely behaviour, the current alert system and public health advice. During a period of severe cold weather in February-March 2018 UV daily doses were around 25–50% lower than the long-term average (1991–2017); however, this would not impact on sunburn risk or the benefit of vitamin D production. In spring 2018 unseasonably high temperatures coincided with high UV daily doses (40–75% above long-term average) on significant days: the London Marathon (22 April) and UK May Day Bank Holiday weekend, which includes a public holiday on the Monday (5–7 May). People were likely to have intermittent excess solar UV exposure on unacclimatised skin, causing sunburn and potentially increasing the risk of skin cancers. No alerts were raised for these events since they occurred outside the alerting period. During a heat-wave in summer 2018 the environmental availability of UV was high—on average of 25% above the long-term average. The public health implications are complex and highly dependent on behaviour and sociodemographic variables such as skin colour. For all three periods Pearson’s correlation analysis showed a statistically significant (p<0.05) positive correlation between maximum daily temperature and erythema-effective UV daily dose. Public health advice may be improved by taking account of both temperature and UV and their implications for behaviour. A health impact-based alert system would be of benefit throughout the year, particularly in spring and summer.
Collapse
|
35
|
Dhamrait GK, Panchal K, Fleury NJ, Abel TN, Ancliffe MK, Crew RC, Croft K, Fernandez BO, Minnion M, Hart PH, Lucas RM, Mark PJ, Feelisch M, Weller RB, Matthews V, Gorman S. Characterising nitric oxide-mediated metabolic benefits of low-dose ultraviolet radiation in the mouse: a focus on brown adipose tissue. Diabetologia 2020; 63:179-193. [PMID: 31713010 DOI: 10.1007/s00125-019-05022-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Accepted: 08/29/2019] [Indexed: 12/20/2022]
Abstract
AIMS/HYPOTHESIS Exposure to sunlight has the potential to suppress metabolic dysfunction and obesity. We previously demonstrated that regular exposure to low-doses of ultraviolet radiation (UVR) reduced weight gain and signs of diabetes in male mice fed a high-fat diet, in part via release of nitric oxide from skin. Here, we explore further mechanistic pathways through which low-dose UVR exerts these beneficial effects. METHODS We fed mice with a luciferase-tagged Ucp1 gene (which encodes uncoupling protein-1 [UCP-1]), referred to here as the Ucp1 luciferase transgenic mouse ('Thermomouse') a high-fat diet and examined the effects of repeated exposure to low-dose UVR on weight gain and development of metabolic dysfunction as well as UCP-1-dependent thermogenesis in interscapular brown adipose tissue (iBAT). RESULTS Repeated exposure to low-dose UVR suppressed the development of glucose intolerance and hepatic lipid accumulation via dermal release of nitric oxide while also reducing circulating IL-6 (compared with mice fed a high-fat diet only). Dietary nitrate supplementation did not mimic the effects of low-dose UVR. A single low dose of UVR increased UCP-1 expression (by more than twofold) in iBAT of mice fed a low-fat diet, 24 h after exposure. However, in mice fed a high-fat diet, there was no effect of UVR on UCP-1 expression in iBAT (compared with mock-treated mice) when measured at regular intervals over 12 weeks. More extensive circadian studies did not identify any substantial shifts in UCP-1 expression in mice exposed to low-dose UVR, although skin temperature at the interscapular site was reduced in UVR-exposed mice. The appearance of cells with a white adipocyte phenotype ('whitening') in iBAT induced by consuming the high-fat diet was suppressed by exposure to low-dose UVR in a nitric oxide-dependent fashion. Significant shifts in the expression of important core gene regulators of BAT function (Dio2, increased more than twofold), fatty acid transport (increased Fatp2 [also known as Slc27a2]), lipolysis (decreased Atgl [also known as Pnpla2]), lipogenesis (decreased Fasn) and inflammation (decreased Tnf), and proportions of macrophages (increased twofold) were observed in iBAT of mice exposed to low-dose UVR. These effects were independent of nitric oxide released from skin. CONCLUSIONS/INTERPRETATION Our results suggest that non-burning (low-dose) UVR suppresses the BAT 'whitening', steatotic and pro-diabetic effects of consuming a high-fat diet through skin release of nitric oxide, with some metabolic and immune pathways in iBAT regulated by UVR independently of nitric oxide.
Collapse
Affiliation(s)
- Gursimran K Dhamrait
- Telethon Kids Institute, University of Western Australia, PO Box 855, West Perth, WA, 6782, Australia
| | - Kunjal Panchal
- Telethon Kids Institute, University of Western Australia, PO Box 855, West Perth, WA, 6782, Australia
| | - Naomi J Fleury
- Telethon Kids Institute, University of Western Australia, PO Box 855, West Perth, WA, 6782, Australia
| | - Tamara N Abel
- Telethon Kids Institute, University of Western Australia, PO Box 855, West Perth, WA, 6782, Australia
| | - Mathew K Ancliffe
- Telethon Kids Institute, University of Western Australia, PO Box 855, West Perth, WA, 6782, Australia
| | - Rachael C Crew
- School of Human Sciences, University of Western Australia, Perth, WA, Australia
| | - Kevin Croft
- School of Biomedical Science - Royal Perth Hospital Unit, The University of Western Australia, Perth, WA, Australia
| | - Bernadette O Fernandez
- Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, Southampton General Hospital, Southampton, UK
| | - Magdalena Minnion
- Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, Southampton General Hospital, Southampton, UK
| | - Prue H Hart
- Telethon Kids Institute, University of Western Australia, PO Box 855, West Perth, WA, 6782, Australia
| | - Robyn M Lucas
- National Centre for Epidemiology and Population Health, Research School of Population Health, Australian National University, Canberra, ACT, Australia
- Centre for Ophthalmology and Visual Science, University of Western Australia, Perth, WA, Australia
| | - Peter J Mark
- School of Human Sciences, University of Western Australia, Perth, WA, Australia
| | - Martin Feelisch
- Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, Southampton General Hospital, Southampton, UK
| | - Richard B Weller
- MRC Centre for Inflammation Research, University of Edinburgh, Edinburgh, UK
| | - Vance Matthews
- School of Biomedical Science - Royal Perth Hospital Unit, The University of Western Australia, Perth, WA, Australia
| | - Shelley Gorman
- Telethon Kids Institute, University of Western Australia, PO Box 855, West Perth, WA, 6782, Australia.
| |
Collapse
|
36
|
Tse BCY, Byrne SN. Lipids in ultraviolet radiation-induced immune modulation. Photochem Photobiol Sci 2020; 19:870-878. [DOI: 10.1039/d0pp00146e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Ultraviolet (UV) radiation modulates cutaneous lipids which in turn mediates immune suppression – a key mechanism conferring both detrimental and beneficial impacts of sun exposure on human health.
Collapse
Affiliation(s)
- Benita C. Y. Tse
- The University of Sydney
- School of Medical Sciences
- Faculty of Medicine and Health
- Sydney
- Australia
| | - Scott N. Byrne
- The University of Sydney
- School of Medical Sciences
- Faculty of Medicine and Health
- Sydney
- Australia
| |
Collapse
|
37
|
Clarke CL, Bell LM, Gies P, Henderson S, Siafarikas A, Gorman S. Season, Terrestrial Ultraviolet Radiation, and Markers of Glucose Metabolism in Children Living in Perth, Western Australia. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2019; 16:ijerph16193734. [PMID: 31623384 PMCID: PMC6801873 DOI: 10.3390/ijerph16193734] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Revised: 09/20/2019] [Accepted: 09/24/2019] [Indexed: 11/16/2022]
Abstract
Seasonality in glucose metabolism has been observed in adult populations; however, little is known of the associations between season and glucose metabolism in children. In this study, we examined whether markers of glucose metabolism (fasting glucose, insulin and HbA1c) varied by season in a paediatric population (6-13 years of age) located in Perth (Western Australia, n = 262) with data categorised by weight. Linear regression was used to analyse the nature of the relationships between mean daily levels of terrestrial ultraviolet radiation (UVR) (prior to the day of the blood test) and measures of glucose metabolism. Fasting blood glucose was significantly lower in autumn compared to spring, for children in combined, normal and obese weight categories. Fasting insulin was significantly lower in autumn and summer compared to winter for individuals of normal weight. HbA1c was significantly higher in summer (compared with winter and spring) in overweight children, which was in the opposite direction to other published findings in adults. In children with obesity, a strong inverse relationship (r = -0.67, p = 0.002) was observed for fasting glucose, and daily terrestrial UVR levels measured in the previous 6 months. Increased safe sun exposure in winter therefore represents a plausible means of reducing fasting blood sugar in children with obesity. However, further studies, using larger paediatric cohorts are required to confirm these relationships.
Collapse
Affiliation(s)
- Catherine L Clarke
- Telethon Kids Institute, University of Western Australia, Perth 6872, Australia.
| | - Lana M Bell
- Department of Paediatric Endocrinology and Diabetes, Perth Children's Hospital, Nedlands 6009, Australia.
| | - Peter Gies
- Australian Radiation Protection and Nuclear Safety Agency (ARPANSA), Yallambie 3085, Victoria, Australia.
| | - Stuart Henderson
- Australian Radiation Protection and Nuclear Safety Agency (ARPANSA), Yallambie 3085, Victoria, Australia.
| | - Aris Siafarikas
- Telethon Kids Institute, University of Western Australia, Perth 6872, Australia.
- Department of Paediatric Endocrinology and Diabetes, Perth Children's Hospital, Nedlands 6009, Australia.
- Medical School, Division of Paediatrics, University of Western Australia, Crawley 6009, Australia.
- Institute for Health Research, University of Notre Dame, Fremantle 6160, Australia.
| | - Shelley Gorman
- Telethon Kids Institute, University of Western Australia, Perth 6872, Australia.
| |
Collapse
|
38
|
Systematic Review of the Effects of Ultraviolet Radiation on Markers of Metabolic Dysfunction. Clin Biochem Rev 2019; 40:147-162. [PMID: 31530965 DOI: 10.33176/aacb-19-00026] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Emerging findings suggest that exposure to ultraviolet wavelengths of sunlight modulates metabolic function. Here we review the metabolic effects of exposure to ultraviolet radiation (UVR), focusing on the effects of phototherapies (that administer UVR), and advice to increase sun exposure in individuals enrolled in clinical trials and intervention studies. We identified 25 studies in which the effects of UVR on metabolic outcomes were examined, including: narrowband ultraviolet B phototherapy (nbUVB, n = 12); psoralen ultraviolet A phototherapy (n = 4); other types of UVR phototherapy (n = 5); and sun exposure advice (n = 5). Most studies recruited a small number of participants (≤100), who were middle-aged individuals undergoing treatment for psoriasis flare, with phototherapy or sun exposure advice administered for ≤12 weeks. Data obtained at baseline were usually compared with an endpoint following treatment with UVR, for a limited number of outcomes. There were few studies in which markers of glucose metabolism were assessed, with some beneficial effects of sun exposure (but not phototherapy) reported. LDL-cholesterol levels were lower in individuals receiving sun exposure advice, while treatment with nbUVB reduced blood concentrations of inflammatory markers (C-reactive protein and interleukin-6). Future studies should focus on determining whether the effects of these interventions change with time, and if they are dependent on the source of UVR (i.e. phototherapy or sun exposure) and wavelength(s) of light administered. Furthermore, studies need to measure a variety of (clinical) markers of glucose metabolism, adiposity and inflammation, control for factors such as skin type and sex, and stratify participants for metabolic disease diagnosis.
Collapse
|
39
|
Zhang GD, Black LJ, Cooper MN, Lucas RM, Gorman S. Significant Associations Between Sun Exposure and Adiposity Were Not Observed in Breast and Prostate Cancer Patients in a Cross-sectional Analysis. Photochem Photobiol 2019; 95:1433-1440. [PMID: 31359445 DOI: 10.1111/php.13145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Accepted: 07/25/2019] [Indexed: 11/27/2022]
Abstract
Obesity is a significant health problem worldwide. Exposure to low-dose ultraviolet radiation (like that in sunlight) suppresses the development of obesity in mice; however, the nature of the associations between sun exposure and adiposity is not well understood in humans. The present study characterized cross-sectional relationships between sun exposure and adiposity in a convenience cohort of breast (n = 269; mean age = 58 years) and prostate (n = 78; mean age = 69 years) cancer patients. Participants were enrolled in a 3-month exercise program in Perth, Australia. Self-reported questionnaires measured time spent outdoors (previous week, winter and summer), sex, age, treatment received and physical activity levels. Adiposity measures included body mass index, waist-hip ratio and body fat percentage (measured via DXA). In unadjusted models, greater time spent outdoors across all times was significantly associated with lower waist-hip ratio, while greater time spent outdoors in the last winter was associated with lower body fat percentage, but not when stratified by sex. There were no statistically significant associations between time spent outdoors and adiposity after adjusting for sex, age, treatments received and physical activity. Longitudinal studies in larger populations may elucidate significant associations not found in our study due to the cross-sectional design and power limitations.
Collapse
Affiliation(s)
- Gary D Zhang
- Telethon Kids Institute, University of Western Australia, Perth, WA, Australia
| | - Lucinda J Black
- School of Public Health, Curtin University, Perth, WA, Australia
| | - Matthew N Cooper
- Telethon Kids Institute, University of Western Australia, Perth, WA, Australia
| | - Robyn M Lucas
- National Centre for Epidemiology and Public Health, Research School of Population Health, Australian National University, Canberra, ACT, Australia.,Centre for Ophthalmology and Visual Science, University of Western Australia, Perth, WA, Australia
| | - Shelley Gorman
- Telethon Kids Institute, University of Western Australia, Perth, WA, Australia
| |
Collapse
|
40
|
Ferguson AL, Kok LF, Luong JK, Van Den Bergh M, Bell-Anderson KS, Fazakerley DJ, Byrne SN. Exposure to solar ultraviolet radiation limits diet-induced weight gain, increases liver triglycerides and prevents the early signs of cardiovascular disease in mice. Nutr Metab Cardiovasc Dis 2019; 29:633-638. [PMID: 30956026 DOI: 10.1016/j.numecd.2019.02.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Revised: 02/21/2019] [Accepted: 02/21/2019] [Indexed: 02/09/2023]
Abstract
BACKGROUND AND AIMS Sunlight exposure is associated with a number of health benefits including protecting us from autoimmunity, cardiovascular disease, obesity and diabetes. Animal studies have confirmed that ultraviolet (UV)-B radiation, independently of vitamin D, can limit diet-induced obesity, metabolic syndrome and atherosclerosis. The aim of this study is to investigate whether exposure to the UV radiation contained in sunlight impacts on these disease parameters. METHODS AND RESULTS We have trialled an intervention with solar UV in obese and atherosclerosis-prone mice. We have discovered that solar-simulated UV can significantly limit diet-induced obesity and reduce atheroma development in mice fed a diet high in sugar and fat. The optimal regime for this benefit was exposure once a week to solar UV equivalent to approximately 30 min of summer sun. Exposure to this optimal dose of solar UV also led to a significant increase in liver triglycerides which may protect the liver from damage. CONCLUSION Our results show that the UV contained in sunlight has the potential to prevent and treat chronic disease at sites distant from irradiated skin. A major health challenge going forward will be to harness the power of the sun safely, without risking an increase in skin cancers.
Collapse
Affiliation(s)
- A L Ferguson
- The University of Sydney, Discipline of Infectious Diseases and Immunology, Central Clinical School, Faculty of Medicine and Health, Sydney, New South Wales, Australia; The University of Sydney, Charles Perkins Centre, Sydney, New South Wales, Australia; The Centenary Institute, Camperdown, New South Wales, Australia
| | - L F Kok
- The University of Sydney, Discipline of Infectious Diseases and Immunology, Central Clinical School, Faculty of Medicine and Health, Sydney, New South Wales, Australia
| | - J K Luong
- The University of Sydney, Discipline of Infectious Diseases and Immunology, Central Clinical School, Faculty of Medicine and Health, Sydney, New South Wales, Australia; The University of Sydney, Charles Perkins Centre, Sydney, New South Wales, Australia
| | - M Van Den Bergh
- The University of Sydney, Discipline of Infectious Diseases and Immunology, Central Clinical School, Faculty of Medicine and Health, Sydney, New South Wales, Australia; The University of Sydney, Charles Perkins Centre, Sydney, New South Wales, Australia
| | - K S Bell-Anderson
- The University of Sydney, Charles Perkins Centre, Sydney, New South Wales, Australia; The University of Sydney, School of Life and Environmental Sciences, Faculty of Science, Sydney, New South Wales, Australia
| | - D J Fazakerley
- The University of Sydney, Charles Perkins Centre, Sydney, New South Wales, Australia; The University of Sydney, School of Life and Environmental Sciences, Faculty of Science, Sydney, New South Wales, Australia
| | - S N Byrne
- The University of Sydney, Discipline of Infectious Diseases and Immunology, Central Clinical School, Faculty of Medicine and Health, Sydney, New South Wales, Australia; The University of Sydney, Charles Perkins Centre, Sydney, New South Wales, Australia; Westmead Institute for Medical Research, Centre for Immunology and Allergy Research, Westmead, New South Wales, Australia.
| |
Collapse
|
41
|
Porter CM, Wechsler AM, Naschold F, Hime SJ, Fox L. Assessing health impacts of home food gardens with Wind River Indian Reservation families: protocol for a randomised controlled trial. BMJ Open 2019; 9:e022731. [PMID: 30948560 PMCID: PMC6500094 DOI: 10.1136/bmjopen-2018-022731] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/14/2018] [Revised: 01/14/2019] [Accepted: 02/11/2019] [Indexed: 12/27/2022] Open
Abstract
INTRODUCTION This community-based participatory research, Growing Resilience, will be the first full-scale randomised controlled trial we have identified that is designed to evaluate impacts of home gardening on family health. It is based on observational studies suggesting home food gardening has myriad health benefits, Wind River Indian Reservation (WRIR) families' interest in home gardening and the need to end Native American health disparities with empowering, appropriate and effective health interventions. METHODS AND ANALYSIS A total of 100 Native American families in WRIR who have not gardened recently but want to garden will be randomly allocated (1:1) to intervention (receiving 2 years of support designing, installing and maintaining a home food garden of at least 80 square feet (approximately 7 square meters) or to delayed-intervention control (receiving same gardening support after 2 years of data collection). Willing family members aged 5 and up will participate in data collection each February and August for 2 years, with blood, biometric and survey measures at each. The primary outcome is adult body mass index (BMI). Secondary outcomes include child BMI, and adult hand strength, self-reported physical and mental health, diabetes control and food security. Primary analysis will be intention to treat (ITT), using univariate and bivariate descriptive statistics followed by a mixed model to estimate the ITT effect of the intervention using analysis of covariance (ANCOVA) estimation. We will also examine treatment affects using a gardening fidelity measure, combined adult and child BMI outcomes using a lambda mu and sigma (LMS) Z-score reference data set and possible mechanisms of health impacts. ETHICS AND DISSEMINATION This protocol was approved by the University of Wyoming Institutional Review Board (IRB) and the project's Community Advisory Board. De-identified data will be shared with each tribe, and results will be published in peer-reviewed journals, summarised for distribution in WRIR, and shared at a national event to be hosted in WRIR in 2020. TRIAL REGISTRATION NUMBER NCT02672748; Pre-results.
Collapse
Affiliation(s)
- Christine M Porter
- Division of Kinesiology and Health, University of Wyoming, Laramie, Wyoming, USA
| | - Alyssa M Wechsler
- Division of Kinesiology and Health, University of Wyoming, Laramie, Wyoming, USA
| | - Felix Naschold
- Department of Economics, University of Wyoming, Laramie, Wyoming, USA
| | - Shawn J Hime
- Wyoming Survey & Analysis Center, University of Wyoming, Laramie, Wyoming, USA
| | - Lanae Fox
- School of Pharmacy, University of Wyoming, Laramie, Wyoming, USA
| |
Collapse
|
42
|
Yoon UA, Kim YC, Lee H, Kwon S, An JN, Kim DK, Kim YS, Lim CS, Lee JP, Kim H. The impact of sunlight exposure on mortality of patients with end stage renal disease. Sci Rep 2019; 9:2230. [PMID: 30778098 PMCID: PMC6379426 DOI: 10.1038/s41598-019-38522-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2018] [Accepted: 12/31/2018] [Indexed: 02/06/2023] Open
Abstract
Recent data suggest that reduced sunlight exposure is associated with increased mortality in the general population. To date, the association between sunlight exposure and mortality in dialysis patients has not been examined. Among 134,478 dialysis patients in the Korean end-stage renal disease (ESRD) cohort from 2001 to 2014, 31,291 patients were enrolled from seven metropolitan cities, and data were analyzed using bi-directional case-crossover design. We examined the association between short-term sunlight exposure and mortality in ESRD patients. We adjusted for temperature, humidity, and daily concentrations of nitrogen dioxide (NO2), sulfur dioxide (SO2), ozone (O3), carbon monoxide (CO), and particle matter (PM10) as confounders. The characteristics of the study population included age (65.6 ± 12.26 (mean ± standard deviation [SD]) years), sex (male, 59.96%; female, 41.04%), comorbidity (diabetes, 53.58%; hypertension, 40.5%), and kidney dialysis type (hemodialysis, 73.02%; peritoneal dialysis, 26.98%). The mean ± SD follow-up time was 4.68 ± 4.37 years. The daily sunlight exposure was significantly decreased in the case group compared with the control group (P = 0.004). Sunlight exposure was associated with all-cause death overall (ORs [95% CI]: 0.99 [0.98-0.99], P = 0.042) in a fully adjusted model. Patients with diabetes (ORs [95% CI]: 0.98 [0.97-0.99], P = 0.016) or aged higher than 75 years (ORs [95% CI]; 0.97 [0.96-0.99], P = 0.020) had higher risks of mortality than patients without diabetes or aged below 75 years, respectively. These findings suggest that sunlight exposure is inversely correlated with all-cause mortality in dialysis patients.
Collapse
Affiliation(s)
- Una Amelia Yoon
- Department of Biostatistics and Epidemiology, School of Public Health, Seoul National University, Seoul, Korea
| | - Yong Chul Kim
- Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea
| | - Hyewon Lee
- Department of Neuropsychiatry, Seoul National University Bundang Hospital, Seongnam, Korea.,Institute of Health and Environment, Seoul National University, Seoul, Korea
| | - Soie Kwon
- Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea
| | - Jung Nam An
- Department of Internal Medicine, Seoul National University Boramae Medical Center, Seoul, Korea
| | - Dong Ki Kim
- Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea.,Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea
| | - Yon Su Kim
- Kidney Research Institute, Seoul National University Hospital, Seoul, Korea.,Department of Medical Science, Seoul National University College of Medicine, Seoul, Korea
| | - Chun Soo Lim
- Department of Internal Medicine, Seoul National University Boramae Medical Center, Seoul, Korea.,Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea
| | - Jung Pyo Lee
- Department of Internal Medicine, Seoul National University Boramae Medical Center, Seoul, Korea. .,Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.
| | - Ho Kim
- Department of Biostatistics and Epidemiology, School of Public Health, Seoul National University, Seoul, Korea. .,Institute of Health and Environment, Seoul National University, Seoul, Korea.
| |
Collapse
|
43
|
Regular exposure to non-burning ultraviolet radiation reduces signs of non-alcoholic fatty liver disease in mature adult mice fed a high fat diet: results of a pilot study. BMC Res Notes 2019; 12:78. [PMID: 30744663 PMCID: PMC6371430 DOI: 10.1186/s13104-019-4112-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Accepted: 02/06/2019] [Indexed: 02/08/2023] Open
Abstract
Objective Obesity often emerges in middle age, increasing risk for metabolic disorders. Our previous preclinical experiments identified that chronic exposure to non-burning ultraviolet radiation, like that achieved through sun exposure, prevented weight gain and signs of metabolic dysfunction in young adult mice fed a high fat diet. Our objective was to perform a pilot study to estimate the effect size of ongoing exposure to sub-erythemal (non-burning, low dose) UVB (1 kJ/m2) radiation on measures of adiposity, food intake and physical activity in ‘mature’ adult C57Bl/6J male mice fed a high fat diet for 12 weeks. Results The severity of liver steatosis, fibrosis and inflammation were reduced in older adult mice exposed twice a week to ultraviolet radiation (from 29 weeks of age), compared to mock-irradiated mice, with some evidence for reduced hepatic mRNAs for tnf and tgfß1 (not fatp2 nor fasN). Power analyses suggested that up to 24 mice per treatment would be required in future experiments to detect a significant effect on some markers of adiposity such as body weight gain. Our studies suggest frequent exposure to low levels of sunlight may reduce the severity of hepatic steatosis induced in older adults living in environments of high caloric intake. Electronic supplementary material The online version of this article (10.1186/s13104-019-4112-8) contains supplementary material, which is available to authorized users.
Collapse
|
44
|
Ghaly S, Bliuc D, Center JR, Clarke MW, Jones AP, Trend S, Kermode AG, Neale RE, Hart PH. Vitamin D C3-epimer levels are proportionally higher with oral vitamin D supplementation compared to ultraviolet irradiation of skin in mice but not humans. J Steroid Biochem Mol Biol 2019; 186:110-116. [PMID: 30296587 DOI: 10.1016/j.jsbmb.2018.10.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/11/2018] [Revised: 09/30/2018] [Accepted: 10/04/2018] [Indexed: 12/22/2022]
Abstract
A proportion of circulating 25-hydroxy vitamin D3 (25(OH)D3)) undergoes epimerization to form C3-epi 25(OH)D3 and C3-epi 1,25(OH)2D3. These epimers have less calcaemic activity than non-epimerized metabolites and are not differentiated by many immunoassays when reporting total 25(OH)D3 levels. This study aimed to compare the effect of exposure to ultraviolet radiation (UVR) and oral vitamin D3 supplementation on vitamin D C3-epimer levels. C57Bl/6 female mice were fed either vitamin D-sufficient (vitamin D3 2000 IU/kg) or -deficient diets (no vitamin D3) for 4 weeks. Among the vitamin D-deficient group, the shaved backs of half were irradiated daily for 4 days with 1 kJ/m2 UVR, followed by twice weekly irradiation for 4 weeks. Despite similar 25(OH)D3 levels, the UV-irradiated group had a lower proportion of C3-epi 25(OH)D3 at week 7 (p < 0.05) and week 9 (p < 0.01). C3-epimer concentrations and %C3-epi 25(OH)D3 were also analysed in serum samples from two human clinical trials. These trials investigated the effect of high dose oral vitamin D3 supplementation and narrowband UVB phototherapy, respectively. Serum 25(OH)D3 and the %C3-epi 25(OH)D3 levels measured at 12 months after oral vitamin D3 supplementation were not significantly different to those measured at the time of maximal effect of phototherapy (2 months). Thus, the proportion of 25(OH)D3 that undergoes epimerization is greater with oral vitamin D3 supplementation than exposure to UVR in mice, but not in humans. This important difference between human and murine vitamin D metabolism warrants consideration when interpreting animal studies.
Collapse
Affiliation(s)
- Simon Ghaly
- Telethon Kids Institute, The University of Western Australia, Perth, WA, Australia; School of Medicine and Pharmacology, The University of Western Australia, Perth, WA, Australia; Department of Gastroenterology and Hepatology, St. Vincent's Hospital, Sydney, NSW, Australia.
| | - Dana Bliuc
- Clinical Studies and Epidemiology, Garvan Institute of Medical Research, Sydney, NSW, Australia
| | - Jacqueline R Center
- Clinical Studies and Epidemiology, Garvan Institute of Medical Research, Sydney, NSW, Australia
| | - Michael W Clarke
- Metabolomics Australia, Centre for Microscopy, Characterisation and Analysis, The University of Western Australia, Perth, WA 6009, Australia
| | - Anderson P Jones
- Telethon Kids Institute, The University of Western Australia, Perth, WA, Australia
| | - Stephanie Trend
- Telethon Kids Institute, The University of Western Australia, Perth, WA, Australia
| | - Allan G Kermode
- Centre for Neuromuscular and Neurological Disorders, Perron Institute for Neurological and Translational Science, University of Western Australia, Perth, WA, Australia; Institute for Immunology and Infectious Disease, Murdoch University, Perth, Australia
| | - Rachel E Neale
- Cancer Aetiology and Prevention Group, QIMR Berghofer, Brisbane, QLD, Australia
| | - Prue H Hart
- Telethon Kids Institute, The University of Western Australia, Perth, WA, Australia
| |
Collapse
|
45
|
Smoothy J, Larcombe AN, Chivers EK, Matthews VB, Gorman S. Maternal high fat diet compromises survival and modulates lung development of offspring, and impairs lung function of dams (female mice). Respir Res 2019; 20:21. [PMID: 30700289 PMCID: PMC6354360 DOI: 10.1186/s12931-019-0976-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Accepted: 01/03/2019] [Indexed: 12/25/2022] Open
Abstract
Background Epidemiological studies have identified strong relationships between maternal obesity and offspring respiratory dysfunction; however, the causal direction is not known. We tested whether maternal obesity alters respiratory function of offspring in early life. Methods Female C57Bl/6 J mice were fed a high or low fat diet prior to and during two rounds of mating and resulting pregnancies with offspring lung function assessed at 2 weeks of age. The lung function of dams was measured at 33 weeks of age. Results A high fat diet caused significant weight gain prior to conception with dams exhibiting elevated fasting glucose, and glucose intolerance. The number of surviving litters was significantly less for dams fed a high fat diet, and surviving offspring weighed more, were longer and had larger lung volumes than those born to dams fed a low fat diet. The larger lung volumes significantly correlated in a linear fashion with body length. Pups born from the second pregnancy had reduced tissue elastance compared to pups born from the first pregnancy, regardless of the dam’s diet. As there was reduced offspring survival born to dams fed a high fat diet, the statistical power of lung function measures of offspring was limited. There were signs of increased inflammation in the bronchoalveolar lavage fluid of dams (but not offspring) fed a high fat diet, with more tumour necrosis factor-α, interleukin(IL)-5, IL-33 and leptin detected. Dams that were fed a high fat diet and became pregnant twice had reduced fasting glucose immediately prior to the second mating, and lower levels of IL-33 and leptin in bronchoalveolar lavage fluid. Conclusions While maternal high fat diet compromised litter survival, it also promoted somatic and lung growth (increased lung volume) in the offspring. Further studies are required to examine downstream effects of this enhanced lung volume on respiratory function in disease settings.
Collapse
Affiliation(s)
- Jordan Smoothy
- Telethon Kids Institute, University of Western Australia, Northern Entrance Perth Children's Hospital, 15 Hospital Ave, Nedlands, Western Australia, 6009, Australia
| | - Alexander N Larcombe
- Telethon Kids Institute, University of Western Australia, Northern Entrance Perth Children's Hospital, 15 Hospital Ave, Nedlands, Western Australia, 6009, Australia.,School of Public Health, Curtin University, Perth, Western Australia, 6845, Australia
| | - Emily K Chivers
- Telethon Kids Institute, University of Western Australia, Northern Entrance Perth Children's Hospital, 15 Hospital Ave, Nedlands, Western Australia, 6009, Australia
| | - Vance B Matthews
- School of Biomedical Sciences, University of Western Australia, Perth, Australia
| | - Shelley Gorman
- Telethon Kids Institute, University of Western Australia, Northern Entrance Perth Children's Hospital, 15 Hospital Ave, Nedlands, Western Australia, 6009, Australia.
| |
Collapse
|
46
|
Jahn D, Dorbath D, Kircher S, Nier A, Bergheim I, Lenaerts K, Hermanns HM, Geier A. Beneficial Effects of Vitamin D Treatment in an Obese Mouse Model of Non-Alcoholic Steatohepatitis. Nutrients 2019; 11:nu11010077. [PMID: 30609782 PMCID: PMC6356425 DOI: 10.3390/nu11010077] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Revised: 12/20/2018] [Accepted: 12/24/2018] [Indexed: 02/06/2023] Open
Abstract
Serum vitamin D levels negatively correlate with obesity and associated disorders such as non-alcoholic steatohepatitis (NASH). However, the mechanisms linking low vitamin D (VD) status to disease progression are not completely understood. In this study, we analyzed the effect of VD treatment on NASH in mice. C57BL6/J mice were fed a high-fat/high-sugar diet (HFSD) containing low amounts of VD for 16 weeks to induce obesity, NASH and liver fibrosis. The effects of preventive and interventional VD treatment were studied on the level of liver histology and hepatic/intestinal gene expression. Interestingly, preventive and to a lesser extent also interventional VD treatment resulted in improvements of liver histology. This included a significant decrease of steatosis, a trend towards lower non-alcoholic fatty liver disease (NAFLD) activity score and a slight non-significant decrease of fibrosis in the preventive treatment group. In line with these changes, preventive VD treatment reduced the hepatic expression of lipogenic, inflammatory and pro-fibrotic genes. Notably, these beneficial effects occurred in conjunction with a reduction of intestinal inflammation. Together, our observations suggest that timely initiation of VD supplementation (preventive vs. interventional) is a critical determinant of treatment outcome in NASH. In the applied animal model, the improvements of liver histology occurred in conjunction with reduced inflammation in the gut, suggesting a potential relevance of vitamin D as a therapeutic agent acting on the gut⁻liver axis.
Collapse
Affiliation(s)
- Daniel Jahn
- Division of Hepatology, University Hospital Würzburg, 97080 Würzburg, Germany.
| | - Donata Dorbath
- Division of Hepatology, University Hospital Würzburg, 97080 Würzburg, Germany.
| | - Stefan Kircher
- Institute of Pathology, University of Würzburg, 97080 Würzburg, Germany.
| | - Anika Nier
- Department of Nutritional Sciences, Molecular Nutritional Science, University of Vienna, 1090 Vienna, Austria.
| | - Ina Bergheim
- Department of Nutritional Sciences, Molecular Nutritional Science, University of Vienna, 1090 Vienna, Austria.
| | - Kaatje Lenaerts
- NUTRIM School for Nutrition and Translational Research in Metabolism, Department of Surgery, Maastricht University Medical Centre, 6200 MD Maastricht, The Netherlands.
| | - Heike M Hermanns
- Division of Hepatology, University Hospital Würzburg, 97080 Würzburg, Germany.
| | - Andreas Geier
- Division of Hepatology, University Hospital Würzburg, 97080 Würzburg, Germany.
- Division of Gastroenterology and Hepatology, University Hospital Zürich, 8091 Zürich, Switzerland.
| |
Collapse
|
47
|
Stern M, Broja M, Sansone R, Gröne M, Skene SS, Liebmann J, Suschek CV, Born M, Kelm M, Heiss C. Blue light exposure decreases systolic blood pressure, arterial stiffness, and improves endothelial function in humans. Eur J Prev Cardiol 2018; 25:1875-1883. [PMID: 30196723 DOI: 10.1177/2047487318800072] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
AIMS Previous studies have shown that ultraviolet light can lead to the release of nitric oxide from the skin and decrease blood pressure. In contrast to visible light the local application of ultraviolet light bears a cancerogenic risk. Here, we investigated whether whole body exposure to visible blue light can also decrease blood pressure and increase endothelial function in healthy subjects. METHODS In a randomised crossover study, 14 healthy male subjects were exposed on 2 days to monochromatic blue light or blue light with a filter foil (control light) over 30 minutes. We measured blood pressure (primary endpoint), heart rate, forearm vascular resistance, forearm blood flow, endothelial function (flow-mediated dilation), pulse wave velocity and plasma nitric oxide species, nitrite and nitroso compounds (secondary endpoints) during and up to 2 hours after exposure. RESULTS Blue light exposure significantly decreased systolic blood pressure and increased heart rate as compared to control. In parallel, blue light significantly increased forearm blood flow, flow-mediated dilation, circulating nitric oxide species and nitroso compounds while it decreased forearm vascular resistance and pulse wave velocity. CONCLUSION Whole body irradiation with visible blue light at real world doses improves blood pressure, endothelial function and arterial stiffness by nitric oxide released from photolabile intracutanous nitric oxide metabolites into circulating blood.
Collapse
Affiliation(s)
- Manuel Stern
- 1 Division of Cardiology, Pulmonology and Vascular Medicine, Medical Faculty, University Duesseldorf, Germany
| | - Melanie Broja
- 1 Division of Cardiology, Pulmonology and Vascular Medicine, Medical Faculty, University Duesseldorf, Germany
| | - Roberto Sansone
- 1 Division of Cardiology, Pulmonology and Vascular Medicine, Medical Faculty, University Duesseldorf, Germany
| | - Michael Gröne
- 1 Division of Cardiology, Pulmonology and Vascular Medicine, Medical Faculty, University Duesseldorf, Germany
| | - Simon S Skene
- 2 Department of Clinical and Experimental Medicine, Faculty of Health and Medical Science, University of Surrey, UK
| | | | - Christoph V Suschek
- 4 Department of Trauma and Hand Surgery, Medical Faculty, University Duesseldorf, Germany
| | - Matthias Born
- 3 Philips GmbH, Innovative Technologies, Germany.,5 Heinrich-Heine University, Germany
| | - Malte Kelm
- 1 Division of Cardiology, Pulmonology and Vascular Medicine, Medical Faculty, University Duesseldorf, Germany
| | - Christian Heiss
- 1 Division of Cardiology, Pulmonology and Vascular Medicine, Medical Faculty, University Duesseldorf, Germany.,2 Department of Clinical and Experimental Medicine, Faculty of Health and Medical Science, University of Surrey, UK.,6 Surrey and Sussex NHS Healthcare Trust, UK
| |
Collapse
|
48
|
Hart PH, Norval M, Byrne SN, Rhodes LE. Exposure to Ultraviolet Radiation in the Modulation of Human Diseases. ANNUAL REVIEW OF PATHOLOGY-MECHANISMS OF DISEASE 2018; 14:55-81. [PMID: 30125148 DOI: 10.1146/annurev-pathmechdis-012418-012809] [Citation(s) in RCA: 72] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
This review focuses primarily on the beneficial effects for human health of exposure to ultraviolet radiation (UVR). UVR stimulates anti-inflammatory and immunosuppressive pathways in skin that modulate psoriasis, atopic dermatitis, and vitiligo; suppresses cutaneous lesions of graft-versus-host disease; and regulates some infection and vaccination outcomes. While polymorphic light eruption and the cutaneous photosensitivity of systemic lupus erythematosus are triggered by UVR, polymorphic light eruption also frequently benefits from UVR-induced immunomodulation. For systemic diseases such as multiple sclerosis, type 1 diabetes, asthma, schizophrenia, autism, and cardiovascular disease, any positive consequences of UVR exposure are more speculative, but could occur through the actions of UVR-induced regulatory cells and mediators, including 1,25-dihydroxy vitamin D3, interleukin-10, and nitric oxide. Reduced UVR exposure is a risk factor for the development of several inflammatory, allergic, and autoimmune conditions, including diseases initiated in early life. This suggests that UVR-induced molecules can regulate cell maturation in developing organs.
Collapse
Affiliation(s)
- Prue H Hart
- Telethon Kids Institute, University of Western Australia, Perth, Western Australia 6008, Australia;
| | - Mary Norval
- University of Edinburgh Medical School, Edinburgh EH8 9AG, United Kingdom;
| | - Scott N Byrne
- Faculty of Medicine and Health, The University of Sydney, Sydney, New South Wales 2006, Australia; .,Westmead Institute for Medical Research, Westmead, New South Wales 2145, Australia
| | - Lesley E Rhodes
- Centre for Dermatology Research, Division of Musculoskeletal and Dermatological Sciences, School of Biological Sciences, and Faculty of Biology, Medicine, and Health, The University of Manchester and Salford Royal NHS Foundation Trust, Manchester Academic Health Science Centre, Manchester M13 9PL, United Kingdom;
| |
Collapse
|
49
|
Ghaly S, Kaakoush NO, Lloyd F, Gordon L, Forest C, Lawrance IC, Hart PH. Ultraviolet Irradiation of Skin Alters the Faecal Microbiome Independently of Vitamin D in Mice. Nutrients 2018; 10:nu10081069. [PMID: 30103486 PMCID: PMC6116187 DOI: 10.3390/nu10081069] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Revised: 08/02/2018] [Accepted: 08/06/2018] [Indexed: 01/01/2023] Open
Abstract
Reduced sunlight exposure has been associated with an increased incidence of Crohn’s disease and ulcerative colitis. The effect of ultraviolet radiation (UVR) on the faecal microbiome and susceptibility to colitis has not been explored. C57Bl/6 female mice were fed three different vitamin D-containing diets for 24 days before half of the mice in each group were UV-irradiated (1 kJ/m2) for each of four days, followed by twice-weekly irradiation of shaved dorsal skin for 35 days. Faecal DNA was extracted and high-throughput sequencing of the 16S RNA gene performed. UV irradiation of skin was associated with a significant change in the beta-diversity of faeces compared to nonirradiated mice, independently of vitamin D. Specifically, members of phylum Firmicutes, including Coprococcus, were enriched, whereas members of phylum Bacteroidetes, such as Bacteroidales, were depleted. Expression of colonic CYP27B1 increased by four-fold and IL1β decreased by five-fold, suggesting a UVR-induced anti-inflammatory effect. UV-irradiated mice, however, were not protected against colitis induced by dextran sodium sulfate (DSS), although distinct faecal microbiome differences were documented post-DSS between UV-irradiated and nonirradiated mice. Thus, skin exposure to UVR alters the faecal microbiome, and further investigations to explore the implications of this in health and disease are warranted.
Collapse
Affiliation(s)
- Simon Ghaly
- Telethon Kids Institute, The University of Western Australia, Perth, WA 6008, Australia.
- School of Medicine and Pharmacology, The University of Western Australia, Perth, WA 6009, Australia.
- Department of Gastroenterology and Hepatology, St. Vincent's Hospital, Sydney, NSW 2010, Australia.
| | - Nadeem O Kaakoush
- School of Medical Sciences, UNSW Sydney, Kensington, NSW 2033, Australia.
| | - Frances Lloyd
- School of Medicine and Pharmacology, The University of Western Australia, Perth, WA 6009, Australia.
| | - Lavinia Gordon
- Australian Genome Research Facility, The Walter and Eliza Hall Institute, Parkville, VIC 3052, Australia.
| | - Cynthia Forest
- Department of Anatomical Pathology, PathWest, Fiona Stanley Hospital, Murdoch, WA 6150, Australia.
| | - Ian C Lawrance
- School of Medicine and Pharmacology, The University of Western Australia, Perth, WA 6009, Australia.
- Centre for Inflammatory Bowel Disease, St. John of God Hospital, Subiaco, WA 6008, Australia.
| | - Prue H Hart
- Telethon Kids Institute, The University of Western Australia, Perth, WA 6008, Australia.
| |
Collapse
|
50
|
Gorman S, Lucas RM, Allen-Hall A, Fleury N, Feelisch M. Ultraviolet radiation, vitamin D and the development of obesity, metabolic syndrome and type-2 diabetes. Photochem Photobiol Sci 2018; 16:362-373. [PMID: 28009891 DOI: 10.1039/c6pp00274a] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Obesity is increasing in prevalence in many countries around the world. Its causes have been traditionally ascribed to a model where energy intake exceeds energy consumption. Reduced energy output in the form of exercise is associated with less sun exposure as many of these activities occur outdoors. This review explores the potential for ultraviolet radiation (UVR), derived from sun exposure, to affect the development of obesity and two of its metabolic co-morbidities, type-2 diabetes and metabolic syndrome. We here discuss the potential benefits (or otherwise) of exposure to UVR based on evidence from pre-clinical, human epidemiological and clinical studies and explore and compare the potential role of UVR-induced mediators, including vitamin D and nitric oxide. Overall, emerging findings suggest a protective role for UVR and sun exposure in reducing the development of obesity and cardiometabolic dysfunction, but more epidemiological and clinical research is required that focuses on measuring the direct associations and effects of exposure to UVR in humans.
Collapse
Affiliation(s)
- Shelley Gorman
- Telethon Kids Institute, University of Western Australia, Perth, Western Australia.
| | - Robyn M Lucas
- Telethon Kids Institute, University of Western Australia, Perth, Western Australia. and National Centre of Epidemiology and Public Health, Research School of Population Health, Australian National University, Canberra, Australian Capital Territory
| | - Aidan Allen-Hall
- Telethon Kids Institute, University of Western Australia, Perth, Western Australia.
| | - Naomi Fleury
- Telethon Kids Institute, University of Western Australia, Perth, Western Australia.
| | - Martin Feelisch
- Clinical and Experimental Sciences, Faculty of Medicine, and NIHR Biomedical Research Centre, University of Southampton and University Hospital Southampton NHS Foundation Trust, Southampton, UK
| |
Collapse
|