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Chen G, Weiskirchen S, Weiskirchen R. Vitamin A: too good to be bad? Front Pharmacol 2023; 14:1186336. [PMID: 37284305 PMCID: PMC10239981 DOI: 10.3389/fphar.2023.1186336] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Accepted: 05/09/2023] [Indexed: 06/08/2023] Open
Abstract
Vitamin A is a micronutrient important for vision, cell growth, reproduction and immunity. Both deficiency and excess consuming of vitamin A cause severe health consequences. Although discovered as the first lipophilic vitamin already more than a century ago and the definition of precise biological roles of vitamin A in the setting of health and disease, there are still many unresolved issues related to that vitamin. Prototypically, the liver that plays a key role in the storage, metabolism and homeostasis of vitamin A critically responds to the vitamin A status. Acute and chronic excess vitamin A is associated with liver damage and fibrosis, while also hypovitaminosis A is associated with alterations in liver morphology and function. Hepatic stellate cells are the main storage site of vitamin A. These cells have multiple physiological roles from balancing retinol content of the body to mediating inflammatory responses in the liver. Strikingly, different animal disease models also respond to vitamin A statuses differently or even opposing. In this review, we discuss some of these controversial issues in understanding vitamin A biology. More studies of the interactions of vitamin A with animal genomes and epigenetic settings are anticipated in the future.
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Affiliation(s)
- Guoxun Chen
- College of Food Science and Technology, College of Biomedicine and Health, Huazhong Agricultural University, Wuhan, China
| | - Sabine Weiskirchen
- Institute of Molecular Pathobiochemistry, Experimental Gene Therapy and Clinical Chemistry (IFMPEGKC), RWTH University Hospital Aachen, Aachen, Germany
| | - Ralf Weiskirchen
- Institute of Molecular Pathobiochemistry, Experimental Gene Therapy and Clinical Chemistry (IFMPEGKC), RWTH University Hospital Aachen, Aachen, Germany
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2
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Visceral and body adiposity are negatively associated with vitamin A nutritional status independently of Body Mass Index and recommended intake of vitamin A in Brazilian Women. J Nutr Biochem 2022; 109:109120. [DOI: 10.1016/j.jnutbio.2022.109120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Revised: 06/20/2022] [Accepted: 06/22/2022] [Indexed: 11/23/2022]
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3
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Tizmaghz A, Bahardoust M, Hosseini M, Pazouki A, Alizadeh Otaghvar H, Shabestanipour G. Changes in Body Composition, Basal Metabolic Rate, and Blood Albumin during the First Year following Laparoscopic Mini-Gastric Bypass. J Obes 2022; 2022:7485736. [PMID: 35800664 PMCID: PMC9256454 DOI: 10.1155/2022/7485736] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Revised: 03/19/2022] [Accepted: 04/30/2022] [Indexed: 11/18/2022] Open
Abstract
Bariatric surgery is currently the only method that can significantly and continuously reduce weight and improve obesity-related comorbidities in morbidly obese patients. Significant weight loss through bariatric surgery can lead to changes in body composition. This study shows the changes in body composition, basal metabolic rate (BMR), and serum albumin in obese people following bariatric surgery. The study included 880 patients who underwent laparoscopic mini-gastric bypass surgery (LMGBP) between 2016 and 2020. The body mass index (BMI), bioelectrical impedance analysis (BIA), age, gender, blood albumin, WC (waist circumference), HC (hip circumference), BMR, and blood albumin were recorded at 0, 3, 6, and 12 months, postoperatively. The reduction in serum albumin concentration was not consistent with weight loss. Bariatric surgery promotes the breakdown of both fat and lean mass on the arms, torso, and thighs. This size reduction usually aggravates the concomitant skin redundancy in these areas which is a challenge for the plastic surgery team. Interestingly, the rate of lean mass reduction of the arms is faster than that of the torso and thighs. Excessive loss of lean body mass will also lower BMR and lead to subsequent weight gain. Despite the faster loss of proteins and lean mass in somatic areas, internal organs and viscera lose fats faster than proteins. According to this study, visceral proteins are the latest proteins to be affected by weight loss. This finding shows a different metabolic response of viscera comparing to somatic areas.
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Affiliation(s)
- Adnan Tizmaghz
- General Surgery, Iran University of Medical Sciences, Tehran, Iran
| | - Mansour Bahardoust
- Department of Epidemiology, School of Public Health, Shahid Beheshti University of Medical Sciences, Tehran, Iran
- Minimally Invasive Surgery Research Center, Rasool -e Akram Hospital, Iran University of Medical Sciences, Tehran, Iran
| | - Mostafa Hosseini
- General Surgery, Iran University of Medical Sciences, Tehran, Iran
| | - Abdulreza Pazouki
- General Surgery and Minimally Invasive Surgery, Iran University of Medical Science, Minimally Invasive Research Center, Center of Excellence of European Branch of International Federation for Surgery of Obesity, Tehran, Iran
| | - Hamidreza Alizadeh Otaghvar
- General Surgery and Plastic Surgery, Iran University of Medical Science, Minimally Invasive Research Center, Center of Excellence of European Branch of International Federation for Surgery of Obesity, Tehran, Iran
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Carotenoid Biosynthetic Genes in Cabbage: Genome-Wide Identification, Evolution, and Expression Analysis. Genes (Basel) 2021; 12:genes12122027. [PMID: 34946976 PMCID: PMC8701174 DOI: 10.3390/genes12122027] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Revised: 12/16/2021] [Accepted: 12/17/2021] [Indexed: 12/26/2022] Open
Abstract
Carotenoids are natural functional pigments produced by plants and microorganisms and play essential roles in human health. Cabbage (Brassica oleracea L. var. capitata L.) is an economically important vegetable in terms of production and consumption. It is highly nutritious and contains β-carotene, lutein, and other antioxidant carotenoids. Here, we systematically analyzed carotenoid biosynthetic genes (CBGs) on the whole genome to understand the carotenoid biosynthetic pathway in cabbage. In total, 62 CBGs were identified in the cabbage genome, which are orthologs of 47 CBGs in Arabidopsis thaliana. Out of the 62 CBGs, 46 genes in cabbage were mapped to nine chromosomes. Evolutionary analysis of carotenoid biosynthetic orthologous gene pairs among B. oleracea, B. rapa, and A. thaliana revealed that orthologous genes of B. oleracea underwent a negative selection similar to that of B. rapa. Expression analysis of the CBGs showed functional differentiation of orthologous gene copies in B. oleracea and B. rapa. Exogenous phytohormone treatment suggested that ETH, ABA, and MeJA can promote some important CBGs expression in cabbage. Phylogenetic analysis showed that BoPSYs exhibit high conservatism. Subcellular localization analysis indicated that BoPSYs are located in the chloroplast. This study is the first to study carotenoid biosynthesis genes in cabbage and provides a basis for further research on carotenoid metabolic mechanisms in cabbage.
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Ha J, Kwon Y, Kwon JW, Kim D, Park SH, Hwang J, Lee CM, Park S. Micronutrient status in bariatric surgery patients receiving postoperative supplementation per guidelines: Insights from a systematic review and meta-analysis of longitudinal studies. Obes Rev 2021; 22:e13249. [PMID: 33938111 DOI: 10.1111/obr.13249] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/01/2020] [Revised: 03/10/2021] [Accepted: 03/10/2021] [Indexed: 01/20/2023]
Abstract
The micronutrient status and optimal monitoring schedule after bariatric surgery have not been sufficiently assessed. This systematic review and meta-analysis investigated the longitudinal changes in micronutrient status after bariatric surgery. PubMed, EMBASE, and Cochrane Library were searched for articles that measured preoperative and postoperative serum micronutrient levels in patients undergoing Roux-en-Y gastric bypass (RYGB) or sleeve gastrectomy (SG). Among guideline-adherent studies, the longitudinal changes in micronutrient status were investigated using weighted mean difference (WMD) using a random-effects model. Among the 82 included studies, the guideline adherence rates for micronutrient supplementation after bariatric surgery did not exceed 20%. In patients supplemented per guidelines, vitamin A significantly decreased after RYGB by -7.54 (95% confidence interval [CI], -10.16 to -4.92) μg/dl at 12-23 months, vitamin E decreased after RYGB by -2.35 (95% CI, -3.65 to -1.05) μg/dl at ≥24 months, and ferritin by -54.93 (95% CI, -77.19 to -32.67] μg/L at ≥24 months after SG, compared with baseline, with moderate level of evidence. Significant decreases in micronutrient levels at certain follow-up intervals in studies with supplementation per guidelines need to be considered to establish a post-bariatric micronutrient monitoring schedule for timely detection and management of micronutrient deficiencies.
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Affiliation(s)
- Jane Ha
- Department of Medicine, Korea University College of Medicine, Seoul, South Korea.,Center for Obesity and Metabolic Diseases, Korea University Anam Hospital, Seoul, South Korea
| | - Yeongkeun Kwon
- Center for Obesity and Metabolic Diseases, Korea University Anam Hospital, Seoul, South Korea.,Division of Foregut Surgery, Korea University College of Medicine, Seoul, South Korea
| | - Jin-Won Kwon
- BK21 FOUR Community-Based Intelligent Novel Drug Discovery Education Unit, College of Pharmacy and Research Institute of Pharmaceutical Sciences, Kyungpook National University, Daegu, South Korea
| | - Dohyang Kim
- Department of Statistics, Daegu University, Gyeongbuk, South Korea
| | - Shin-Hoo Park
- Center for Obesity and Metabolic Diseases, Korea University Anam Hospital, Seoul, South Korea.,Division of Foregut Surgery, Korea University College of Medicine, Seoul, South Korea
| | - Jinseub Hwang
- Department of Statistics, Daegu University, Gyeongbuk, South Korea
| | - Chang Min Lee
- Division of Foregut Surgery, Korea University College of Medicine, Seoul, South Korea
| | - Sungsoo Park
- Center for Obesity and Metabolic Diseases, Korea University Anam Hospital, Seoul, South Korea.,Division of Foregut Surgery, Korea University College of Medicine, Seoul, South Korea
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6
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O'Kane M, Parretti HM, Pinkney J, Welbourn R, Hughes CA, Mok J, Walker N, Thomas D, Devin J, Coulman KD, Pinnock G, Batterham RL, Mahawar KK, Sharma M, Blakemore AI, McMillan I, Barth JH. British Obesity and Metabolic Surgery Society Guidelines on perioperative and postoperative biochemical monitoring and micronutrient replacement for patients undergoing bariatric surgery-2020 update. Obes Rev 2020; 21:e13087. [PMID: 32743907 PMCID: PMC7583474 DOI: 10.1111/obr.13087] [Citation(s) in RCA: 110] [Impact Index Per Article: 27.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/05/2020] [Revised: 05/21/2020] [Accepted: 05/31/2020] [Indexed: 02/06/2023]
Abstract
Bariatric surgery is recognized as the most clinically and cost-effective treatment for people with severe and complex obesity. Many people presenting for surgery have pre-existing low vitamin and mineral concentrations. The incidence of these may increase after bariatric surgery as all procedures potentially cause clinically significant micronutrient deficiencies. Therefore, preparation for surgery and long-term nutritional monitoring and follow-up are essential components of bariatric surgical care. These guidelines update the 2014 British Obesity and Metabolic Surgery Society nutritional guidelines. Since the 2014 guidelines, the working group has been expanded to include healthcare professionals working in specialist and non-specialist care as well as patient representatives. In addition, in these updated guidelines, the current evidence has been systematically reviewed for adults and adolescents undergoing the following procedures: adjustable gastric band, sleeve gastrectomy, Roux-en-Y gastric bypass and biliopancreatic diversion/duodenal switch. Using methods based on Scottish Intercollegiate Guidelines Network methodology, the levels of evidence and recommendations have been graded. These guidelines are comprehensive, encompassing preoperative and postoperative biochemical monitoring, vitamin and mineral supplementation and correction of nutrition deficiencies before, and following bariatric surgery, and make recommendations for safe clinical practice in the U.K. setting.
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Affiliation(s)
- Mary O'Kane
- Dietetic Department, Leeds Teaching Hospitals NHS Trust, Leeds, UK
| | | | - Jonathan Pinkney
- Faculty of Health and Human Sciences, Peninsula Schools of Medicine and Dentistry, Plymouth, UK.,Department of Endocrinology, Plymouth Hospitals NHS Trust, Plymouth, UK
| | - Richard Welbourn
- Department of Upper GI and Bariatric Surgery, Musgrove Park Hospital, Taunton and Somerset NHS Foundation Trust, Taunton, UK
| | - Carly A Hughes
- Norwich Medical School, University of East Anglia, Norwich, UK.,Fakenham Weight Management Service, Fakenham Medical Practice, Fakenham, UK
| | - Jessica Mok
- Centre for Obesity Research, Rayne Institute, Department of Medicine, University College London, London, UK
| | - Nerissa Walker
- School of Biosciences, Sutton Bonington Campus, University of Nottingham, Nottingham, UK
| | - Denise Thomas
- Department of Nutrition and Dietetics, Portsmouth Hospitals NHS Trust, Portsmouth, UK
| | - Jennifer Devin
- Specialist Weight Management Service, Betsi Cadwaladr University Health Board, Wales, UK
| | - Karen D Coulman
- Population Health Sciences, Bristol Medical School. University of Bristol, Bristol, UK.,Obesity and Bariatric Surgery Service, Southmead Hospital, North Bristol NHS Trust, Bristol, UK
| | | | - Rachel L Batterham
- Centre for Obesity Research, Rayne Institute, Department of Medicine, University College London, London, UK.,Bariatric Centre for Weight Management and Metabolic Surgery, UCLH, University College London Hospital (UCLH), London, UK.,National Institute of Health Research, UCLH Biomedical Research Centre, London, UK
| | - Kamal K Mahawar
- Department of General Surgery, Sunderland Royal Hospital, Sunderland, UK
| | - Manisha Sharma
- Department of Clinical Biochemistry & Bariatric Surgery, Homerton University Hospital NHS Trust, London, UK
| | - Alex I Blakemore
- Department of Life Sciences, Brunel University, London, UK.,Department of Medicine, Imperial College, London, UK
| | | | - Julian H Barth
- Department of Chemical Pathology & Metabolic Medicine, Leeds Teaching Hospitals NHS Trust, Leeds, UK
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7
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Martínez-Ortega AJ, Olveira G, Pereira-Cunill JL, Arraiza-Irigoyen C, García-Almeida JM, Irles Rocamora JA, Molina-Puerta MJ, Molina Soria JB, Rabat-Restrepo JM, Rebollo-Pérez MI, Serrano-Aguayo MP, Tenorio-Jiménez C, Vílches-López FJ, García-Luna PP. Recommendations Based on Evidence by the Andalusian Group for Nutrition Reflection and Investigation (GARIN) for the Pre- and Postoperative Management of Patients Undergoing Obesity Surgery. Nutrients 2020; 12:nu12072002. [PMID: 32640531 PMCID: PMC7400832 DOI: 10.3390/nu12072002] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 06/24/2020] [Accepted: 07/02/2020] [Indexed: 12/13/2022] Open
Abstract
In order to develop evidence-based recommendations and expert consensus for nutrition management of patients undergoing bariatric surgery and postoperative follow-up, we conducted a systematic literature search using PRISMA methodology plus critical appraisal following the SIGN and AGREE-II procedures. The results were discussed among all members of the GARIN group, and all members answered a Likert scale questionnaire to assess the degree of support for every recommendation. Patients undergoing bariatric surgery should be screened preoperatively for some micronutrient deficiencies and treated accordingly. A VLCD (Very Low-Calorie Diet) should be used for 4–8 weeks prior to surgery. Postoperatively, a liquid diet should be maintained for a month, followed by a semi-solid diet also for one month. Protein requirements (1–1.5 g/kg) should be estimated using adjusted weight. Systematic use of specific multivitamin supplements is encouraged. Calcium citrate and vitamin D supplements should be used at higher doses than are currently recommended. The use of proton-pump inhibitors should be individualised, and vitamin B12 and iron should be supplemented in case of deficit. All patients, especially pregnant women, teenagers, and elderly patients require a multidisciplinary approach and specialised follow-up. These recommendations and suggestions regarding nutrition management when undergoing bariatric surgery and postoperative follow-up have direct clinical applicability.
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Affiliation(s)
- Antonio J. Martínez-Ortega
- Unidad de Gestión Clínica de Endocrinología y Nutrición, Hospital Universitario Virgen del Rocío, 41013 Sevilla, Spain; (A.J.M.-O.); (J.L.P.-C.); (M.P.S.-A.); (P.P.G.-L.)
- Endocrine Diseases Research Group, Institute of Biomedicine of Seville (IBiS), 41007 Sevilla, Spain
| | - Gabriel Olveira
- Unidad de Gestión Clínica de Endocrinología y Nutrición, Hospital Regional Universitario de Málaga/Universidad de Málaga, 29010 Málaga, Spain
- Instituto de Investigación Biomédica de Málaga (IBIMA), 29010 Málaga, Spain;
- CIBERDEM (CB07/08/0019), Instituto de Salud Carlos III, 28029 Madrid, Spain
- Correspondence: ; Tel.: +34-951-29-0343
| | - José L. Pereira-Cunill
- Unidad de Gestión Clínica de Endocrinología y Nutrición, Hospital Universitario Virgen del Rocío, 41013 Sevilla, Spain; (A.J.M.-O.); (J.L.P.-C.); (M.P.S.-A.); (P.P.G.-L.)
- Endocrine Diseases Research Group, Institute of Biomedicine of Seville (IBiS), 41007 Sevilla, Spain
| | | | - José M. García-Almeida
- Instituto de Investigación Biomédica de Málaga (IBIMA), 29010 Málaga, Spain;
- Unidad de gestión Clínica de Endocrinología y Nutrición, Hospital Universitario Virgen de la Victoria, 29010 Málaga, Spain
| | | | - María J. Molina-Puerta
- UGC Endocrinología y Nutrición, Hospital Universitario Reina Sofía, 14004 Córdoba, Spain;
- Instituto Maimónides de Investigación Biomédica de Córdoba (IMIBIC), 14004 Córdoba, Spain
| | | | | | - María I. Rebollo-Pérez
- Servicio de Endocrinología y Nutrición, Hospital Juan Ramón Jiménez, 21005 Huelva, Spain;
| | - María P. Serrano-Aguayo
- Unidad de Gestión Clínica de Endocrinología y Nutrición, Hospital Universitario Virgen del Rocío, 41013 Sevilla, Spain; (A.J.M.-O.); (J.L.P.-C.); (M.P.S.-A.); (P.P.G.-L.)
- Endocrine Diseases Research Group, Institute of Biomedicine of Seville (IBiS), 41007 Sevilla, Spain
| | - Carmen Tenorio-Jiménez
- Endocrinology and Nutrition Clinical Management Unit, University Hospital Virgen de las Nieves, 18014 Granada, Spain;
| | | | - Pedro P. García-Luna
- Unidad de Gestión Clínica de Endocrinología y Nutrición, Hospital Universitario Virgen del Rocío, 41013 Sevilla, Spain; (A.J.M.-O.); (J.L.P.-C.); (M.P.S.-A.); (P.P.G.-L.)
- Endocrine Diseases Research Group, Institute of Biomedicine of Seville (IBiS), 41007 Sevilla, Spain
- GARIN Group Coordinator, 41007 Seville, Spain
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Berkenstock MK, Castoro CJ, Carey AR. Outer retina changes on optical coherence tomography in vitamin A deficiency. Int J Retina Vitreous 2020; 6:23. [PMID: 32518692 PMCID: PMC7275575 DOI: 10.1186/s40942-020-00224-1] [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: 10/30/2019] [Accepted: 05/27/2020] [Indexed: 02/07/2023] Open
Abstract
Background Vitamin A deficiency is rare in the United States and can be missed in patients with malabsorption syndromes without a high dose of suspicion. Ocular complications of hypovitaminosis A include xerosis and nyctalopia, and to a lesser extent reduction in visual acuity and color vision. Outer retinal changes, as seen on spectral domain optic coherence tomography (SD-OCT), in patients with vitamin A deficiency have previously not been documented. Case presentation We present two cases with symptoms of severe nyctalopia who were subsequently diagnosed with severe Vitamin A deficiency and their unique findings on SD-OCT of outer nuclear layer diffuse thinning with irregular appearance of the interdigitating zone and the ellipsoid zone as well as normalization after vitamin A supplementation. Conclusions Outer nuclear layer thinning and disruption of the outer retinal bands on SD-OCT are reversible with correction of vitamin A deficiency. Improvement in visual acuity, color vision, and nyctalopia are possible with early diagnosis and appropriate treatment.
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Affiliation(s)
- Meghan K Berkenstock
- Johns Hopkins School of Medicine, Wilmer Eye Institute, 600 N. Wolfe Street, Woods 459A, Baltimore, MD 21287 USA
| | - Charles J Castoro
- Johns Hopkins School of Medicine, Wilmer Eye Institute, 600 N. Wolfe Street, Woods 459A, Baltimore, MD 21287 USA
| | - Andrew R Carey
- Johns Hopkins School of Medicine, Wilmer Eye Institute, 600 N. Wolfe Street, Woods 459A, Baltimore, MD 21287 USA
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9
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Adolescent Bariatric Surgery: Current Concepts and Future Directions. CURRENT SURGERY REPORTS 2019. [DOI: 10.1007/s40137-019-0232-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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10
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Vitamin D supplementation for the prevention of vitamin D deficiency after bariatric surgery: a systematic review and meta-analysis. Eur J Clin Nutr 2017; 72:1061-1070. [DOI: 10.1038/s41430-017-0059-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2017] [Revised: 08/17/2017] [Accepted: 09/21/2017] [Indexed: 02/07/2023]
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Saeed A, Dullaart RPF, Schreuder TCMA, Blokzijl H, Faber KN. Disturbed Vitamin A Metabolism in Non-Alcoholic Fatty Liver Disease (NAFLD). Nutrients 2017; 10:nu10010029. [PMID: 29286303 PMCID: PMC5793257 DOI: 10.3390/nu10010029] [Citation(s) in RCA: 128] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Revised: 12/13/2017] [Accepted: 12/19/2017] [Indexed: 12/22/2022] Open
Abstract
Vitamin A is required for important physiological processes, including embryogenesis, vision, cell proliferation and differentiation, immune regulation, and glucose and lipid metabolism. Many of vitamin A’s functions are executed through retinoic acids that activate transcriptional networks controlled by retinoic acid receptors (RARs) and retinoid X receptors (RXRs).The liver plays a central role in vitamin A metabolism: (1) it produces bile supporting efficient intestinal absorption of fat-soluble nutrients like vitamin A; (2) it produces retinol binding protein 4 (RBP4) that distributes vitamin A, as retinol, to peripheral tissues; and (3) it harbors the largest body supply of vitamin A, mostly as retinyl esters, in hepatic stellate cells (HSCs). In times of inadequate dietary intake, the liver maintains stable circulating retinol levels of approximately 2 μmol/L, sufficient to provide the body with this vitamin for months. Liver diseases, in particular those leading to fibrosis and cirrhosis, are associated with impaired vitamin A homeostasis and may lead to vitamin A deficiency. Liver injury triggers HSCs to transdifferentiate to myofibroblasts that produce excessive amounts of extracellular matrix, leading to fibrosis. HSCs lose the retinyl ester stores in this process, ultimately leading to vitamin A deficiency. Non-alcoholic fatty liver disease (NAFLD) is the hepatic manifestation of metabolic syndrome and is a spectrum of conditions ranging from benign hepatic steatosis to non-alcoholic steatohepatitis (NASH); it may progress to cirrhosis and liver cancer. NASH is projected to be the main cause of liver failure in the near future. Retinoic acids are key regulators of glucose and lipid metabolism in the liver and adipose tissue, but it is unknown whether impaired vitamin A homeostasis contributes to or suppresses the development of NAFLD. A genetic variant of patatin-like phospholipase domain-containing 3 (PNPLA3-I148M) is the most prominent heritable factor associated with NAFLD. Interestingly, PNPLA3 harbors retinyl ester hydrolase activity and PNPLA3-I148M is associated with low serum retinol level, but enhanced retinyl esters in the liver of NAFLD patients. Low circulating retinol in NAFLD may therefore not reflect true “vitamin A deficiency”, but rather disturbed vitamin A metabolism. Here, we summarize current knowledge about vitamin A metabolism in NAFLD and its putative role in the progression of liver disease, as well as the therapeutic potential of vitamin A metabolites.
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Affiliation(s)
- Ali Saeed
- Department of Gastroenterology and Hepatology, University Medical Center Groningen, University of Groningen, 9713 GZ Groningen, The Netherlands.
- Institute of Molecular Biology & Bio-Technology, Bahauddin Zakariya University, Multan 60800, Pakistan.
| | - Robin P F Dullaart
- Department of Endocrinology, University Medical Center Groningen, University of Groningen, 9713 GZ Groningen, The Netherlands.
| | - Tim C M A Schreuder
- Department of Gastroenterology and Hepatology, University Medical Center Groningen, University of Groningen, 9713 GZ Groningen, The Netherlands.
| | - Hans Blokzijl
- Department of Gastroenterology and Hepatology, University Medical Center Groningen, University of Groningen, 9713 GZ Groningen, The Netherlands.
| | - Klaas Nico Faber
- Department of Gastroenterology and Hepatology, University Medical Center Groningen, University of Groningen, 9713 GZ Groningen, The Netherlands.
- Department of Laboratory Medicine, University Medical Center Groningen, University of Groningen, 9713 GZ Groningen, The Netherlands.
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12
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Effects of bariatric surgery on glycemic and lipid metabolism, surgical complication and quality of life in adolescents with obesity: a systematic review and meta-analysis. Surg Obes Relat Dis 2017; 13:2037-2055. [DOI: 10.1016/j.soard.2017.09.516] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Revised: 08/28/2017] [Accepted: 09/12/2017] [Indexed: 12/20/2022]
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