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Henning P, Westerlund A, Horkeby K, Lionikaite V, Nilsson KH, Movérare-Skrtic S, Conaway HH, Lerner UH. Vitamin A enhanced periosteal osteoclastogenesis is associated with increased number of tissue-derived macrophages/osteoclast progenitors. J Biol Chem 2024; 300:107308. [PMID: 38657862 PMCID: PMC11163173 DOI: 10.1016/j.jbc.2024.107308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2023] [Revised: 03/27/2024] [Accepted: 04/15/2024] [Indexed: 04/26/2024] Open
Abstract
A deleterious effect of elevated levels of vitamin A on bone health has been reported in clinical studies. Mechanistic studies in rodents have shown that numbers of periosteal osteoclasts are increased, while endocortical osteoclasts are simultaneously decreased by vitamin A treatment. The present study investigated the in vitro and in vivo effect of all-trans retinoic acid (ATRA), the active metabolite of vitamin A, on periosteal osteoclast progenitors. Mouse calvarial bone cells were cultured in media containing ATRA, with or without the osteoclastogenic cytokine receptor activator of nuclear factor kappa B-ligand (RANKL), on plastic dishes or bone discs. Whereas ATRA did not stimulate osteoclast formation alone, the compound robustly potentiated the formation of RANKL-induced bone resorbing osteoclasts. This effect was due to stimulation by ATRA (half-maximal stimulation ∼3 nM) on the numbers of macrophages/osteoclast progenitors in the bone cell cultures, as assessed by mRNA and protein expression of several macrophage and osteoclast progenitor cell markers, such as macrophage colony-stimulating factor receptor, receptor activator of nuclear factor kappa B, F4/80, and CD11b, as well as by flow cytometry (FACS) analysis of CD11b+/F480+/Gr1- cells. The stimulation of macrophage numbers in the periosteal cell cultures was not mediated by increased macrophage colony-stimulating factor or interleukin-34. In contrast, ATRA did not enhance macrophages in bone marrow cell cultures. Importantly, ATRA treatment upregulated the mRNA expression of several macrophage-related genes in the periosteum of tibia in adult mice. These observations demonstrate a novel mechanism by which vitamin A enhances osteoclast formation specifically on periosteal surfaces.
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Affiliation(s)
- Petra Henning
- Department of Internal Medicine and Clinical Nutrition, Sahlgrenska Osteoporosis Centre and Centre for Bone and Arthritis Research, Institute for Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
| | - Anna Westerlund
- Department of Internal Medicine and Clinical Nutrition, Sahlgrenska Osteoporosis Centre and Centre for Bone and Arthritis Research, Institute for Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
| | - Karin Horkeby
- Department of Internal Medicine and Clinical Nutrition, Sahlgrenska Osteoporosis Centre and Centre for Bone and Arthritis Research, Institute for Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
| | - Vikte Lionikaite
- Department of Internal Medicine and Clinical Nutrition, Sahlgrenska Osteoporosis Centre and Centre for Bone and Arthritis Research, Institute for Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
| | - Karin H Nilsson
- Department of Internal Medicine and Clinical Nutrition, Sahlgrenska Osteoporosis Centre and Centre for Bone and Arthritis Research, Institute for Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
| | - Sofia Movérare-Skrtic
- Department of Internal Medicine and Clinical Nutrition, Sahlgrenska Osteoporosis Centre and Centre for Bone and Arthritis Research, Institute for Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
| | - H Herschel Conaway
- Department of Physiology and Cell Biology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
| | - Ulf H Lerner
- Department of Internal Medicine and Clinical Nutrition, Sahlgrenska Osteoporosis Centre and Centre for Bone and Arthritis Research, Institute for Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden.
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Batteux B, Bennis Y, Bodeau S, Masmoudi K, Hurtel-Lemaire AS, Kamel S, Gras-Champel V, Liabeuf S. Associations between osteoporosis and drug exposure: A post-marketing study of the World Health Organization pharmacovigilance database (VigiBase®). Bone 2021; 153:116137. [PMID: 34343739 DOI: 10.1016/j.bone.2021.116137] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Revised: 07/13/2021] [Accepted: 07/28/2021] [Indexed: 01/22/2023]
Abstract
BACKGROUND Bone remodeling is a complex process, and many conditions (including drug exposure) lead to osteoporosis. Here, we sought to detect new disproportionality signals for drugs associated with osteoporosis. METHODS We performed a disproportionality analysis of the World Health Organization's VigiBase® pharmacovigilance database through April 12, 2020. The frequency of reports on osteoporosis for all identified drug classes was compared with that for all other drugs and quoted as the reporting odds ratio (ROR) [95% confidence interval (CI)]. RESULTS Of the 7,594,968 cases spontaneously recorded to VigiBase®, 4758 concerned osteoporosis. New disproportionality signals with a pharmacologically plausible mechanism were found for drugs used in neurology (levodopa (ROR [95%CI]: 10.18 [4.33-25.10]), selective serotonin agonists (4.22 [2.34-7.00]) and memantine (4.10 [1.56-8.93])), hematology (romiplostim (4.93 [1.15-21.10])), pulmonology (macitentan (3.02 [1.84-4.90])), ophthalmology (ranibizumab (3.31 [1.00-10.51])) and rheumatology (tofacitinib (3.65 [3.00-4.40])). The robustness of these new results is supported by the significant RORs for the vast majority of drugs already known to induce osteoporosis and/or increase the fracture risk, namely glucocorticoids, gonadotropin-releasing hormone analogs, anti-aromatases, androgen receptor blockers, thyroid hormones, proton pump inhibitors, thiazolidinediones, vitamin K antagonists, loop diuretics, protease inhibitors, nucleoside and nucleotide reverse transcriptase inhibitors, and enzyme-inducing antiepileptics including barbiturates and derivatives, hydantoin derivatives, carboxamide derivatives and fatty acid derivatives. CONCLUSION We established up a comprehensive list of drugs potentially associated with osteoporosis and highlighted those with pharmacologically plausible mechanisms leading to bone fragility. Our results might pave the way for additional exploration of these mechanisms.
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Affiliation(s)
- Benjamin Batteux
- Department of Pharmacology, Amiens University Medical Center, F-80054 Amiens, France; Department of Rheumatology, Saint-Quentin Medical Center, F-02321 Saint-Quentin, France; MP3CV Laboratory, EA7517, Jules Verne University of Picardie, F-80054 Amiens, France; RECIF, Amiens-Picardie University Medical Center, F-80054 Amiens, France.
| | - Youssef Bennis
- Department of Pharmacology, Amiens University Medical Center, F-80054 Amiens, France; MP3CV Laboratory, EA7517, Jules Verne University of Picardie, F-80054 Amiens, France
| | - Sandra Bodeau
- Department of Pharmacology, Amiens University Medical Center, F-80054 Amiens, France; MP3CV Laboratory, EA7517, Jules Verne University of Picardie, F-80054 Amiens, France
| | - Kamel Masmoudi
- Department of Pharmacology, Amiens University Medical Center, F-80054 Amiens, France
| | | | - Said Kamel
- MP3CV Laboratory, EA7517, Jules Verne University of Picardie, F-80054 Amiens, France; Biochemistry Laboratory, Amiens University Medical Center, F-80000 Amiens, France
| | - Valérie Gras-Champel
- Department of Pharmacology, Amiens University Medical Center, F-80054 Amiens, France; MP3CV Laboratory, EA7517, Jules Verne University of Picardie, F-80054 Amiens, France
| | - Sophie Liabeuf
- Department of Pharmacology, Amiens University Medical Center, F-80054 Amiens, France; MP3CV Laboratory, EA7517, Jules Verne University of Picardie, F-80054 Amiens, France
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3
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Toraishi M, Uenishi K, Iwamoto J, Otani T. Vitamin A intake is related to stress fracture occurrence in male collegiate long-distance runners. J Sports Med Phys Fitness 2020; 61:1509-1514. [PMID: 33269888 DOI: 10.23736/s0022-4707.20.11792-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
BACKGROUND Nutrient intake has an essential role in bone disorder prevention among long-distance runners. However, the influence of Vitamin A intake on the risk of stress fractures remains unknown. This prospective study aimed to investigate the association between Vitamin A intake, and stress fracture occurrence in male collegiate long-distance runners. METHODS Forty-one male long-distance runners were recruited from a top-class long-distance college running team whose complete survey data on bone mass, anthropometric measurements, blood and urine tests, food intake frequency, history of competing in long-distance races, and monthly running distance during 2009-2010 were available. The influence of factors related to stress fractures, including Vitamin A intake, at baseline and the occurrence of stress fractures during the 1-year period were investigated. RESULTS Four athletes experienced stress fractures during the study period (stress fracture group) and had significantly higher Vitamin A, calcium, and iron intake at baseline compared with that in the nonstress fracture group. In the stress fracture group, the mean daily Vitamin A intake was 2792 μg of retinol activity equivalents (RAE), which was higher than the upper intake limit for males aged 18-25 years in the Japanese Dietary Standard. Logistic regression analyses showed that only Vitamin A intake independently contributed to stress fracture occurrence. The odds ratio of developing stress fractures with a 100-μg RAE increase in Vitamin A intake was 1.22. CONCLUSIONS A result of the present study suggested that Vitamin A intake was associated with stress fracture occurrence in male collegiate long-distance runners.
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Affiliation(s)
- Mami Toraishi
- Graduate School of Health Management, Keio University, Kanagawa, Japan - .,Teikyo University Institute of Sports Science and Medicine, Tokyo, Japan -
| | - Kazuhiro Uenishi
- Laboratory of Physiological Nutrition, Kagawa Nutrition University, Saitama, Japan
| | - Jun Iwamoto
- Bone and Joint Disease Center, Keiyu Orthopedic Hospital, Gunma, Japan
| | - Toshiro Otani
- Graduate School of Health Management, Keio University, Kanagawa, Japan
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Roa LA, Bloemen M, Carels CEL, Wagener FADTG, Von den Hoff JW. Retinoic acid disrupts osteogenesis in pre-osteoblasts by down-regulating WNT signaling. Int J Biochem Cell Biol 2019; 116:105597. [PMID: 31479736 DOI: 10.1016/j.biocel.2019.105597] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Revised: 08/23/2019] [Accepted: 08/30/2019] [Indexed: 12/13/2022]
Abstract
The skull bones are formed by osteoblasts by intramembranous ossification. WNT signaling is a regulator of bone formation. Retinoic Acid (RA) act as a teratogen affecting craniofacial development. We evaluated the effects of RA on the differentiation and mineralization of MC-3T3 cells, and on the expression of WNT components. MC-3T3 were cultured with or without 0.5 μM RA in osteogenic medium and mineralization was assessed by alizarin red staining. The expression of osteogenic marker genes and WNT genes was evaluated at several time points up to 28 days. RA significantly inhibited MC-3T3 mineralization (p < 0.01), without affecting ALP activity or Alp gene expression. Both parameters gradually increased in time. During culture, RA stimulated Runx2 expression at 14 and 28 days compared to the respective controls (p < 0.05). Also, RA significantly reduced Sp7 expression at days 14 and 21 (p < 0.05). Simultaneously, RA significantly reduced the expression of the WNT genes cMyc, Lef1, Lrp5, Lrp6 and Wnt11 compared to the controls (p < 0.05). In contrast, RA increased the expression of the WNT inhibitors Dkk1 at day 21 and Dkk2 at days 14 and 21 (p < 0.01). Our data indicate that RA disrupts osteogenic differentiation and mineralization by inhibiting WNT signaling.
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Affiliation(s)
- Laury A Roa
- Department of Orthodontics and Craniofacial Biology, Radboud University Medical Center, Philips van Leydenlaan 25, Nijmegen, the Netherlands
| | - Marjon Bloemen
- Department of Orthodontics and Craniofacial Biology, Radboud University Medical Center, Philips van Leydenlaan 25, Nijmegen, the Netherlands
| | - Carine E L Carels
- Department of Oral Health Sciences, University KU Leuven. Herestraat 49, Leuven, Belgium
| | - Frank A D T G Wagener
- Department of Orthodontics and Craniofacial Biology, Radboud University Medical Center, Philips van Leydenlaan 25, Nijmegen, the Netherlands
| | - Johannes W Von den Hoff
- Department of Orthodontics and Craniofacial Biology, Radboud University Medical Center, Philips van Leydenlaan 25, Nijmegen, the Netherlands.
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5
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Chawla B, Swain W, Williams AL, Bohnsack BL. Retinoic Acid Maintains Function of Neural Crest-Derived Ocular and Craniofacial Structures in Adult Zebrafish. Invest Ophthalmol Vis Sci 2019; 59:1924-1935. [PMID: 29677354 PMCID: PMC5894920 DOI: 10.1167/iovs.17-22845] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Purpose Retinoic acid (RA) is required for embryonic formation of the anterior segment of the eye and craniofacial structures. The present study further investigated the role of RA in maintaining the function of these neural crest–derived structures in adult zebrafish. Methods Morphology and histology were analyzed by using live imaging, methylacrylate sections, and TUNEL assay. Functional analysis of vision and aqueous humor outflow were assayed with real-time imaging. Results Both decreased and increased RA signaling altered craniofacial and ocular structures in adult zebrafish. Exogenous treatment with all-trans RA for 5 days resulted in a prognathic jaw, while inhibition of endogenous RA synthesis through treatment with 4-diethylaminobenzaldehyde (DEAB) decreased head height. In adult eyes, RA activity was localized to the retinal pigment epithelium, photoreceptors, outer plexiform layer, inner plexiform layer, iris stroma, and ventral canalicular network. Exogenous RA increased apoptosis in the iris stroma and canalicular network in the ventral iridocorneal angle, resulting in the loss of these structures and decreased aqueous outflow. DEAB, which decreased RA activity throughout the eye, induced widespread apoptosis, resulting in corneal edema, cataracts, retinal atrophy, and loss of iridocorneal angle structures. DEAB-treated fish were blind with no optokinetic response and no aqueous outflow from the anterior chamber. Conclusions Tight control of RA levels is required for normal structure and function of the adult anterior segment. These studies demonstrated that RA plays an important role in maintaining ocular and craniofacial structures in adult zebrafish.
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Affiliation(s)
- Bahaar Chawla
- Department of Ophthalmology and Visual Sciences, Kellogg Eye Center, University of Michigan, Ann Arbor, Michigan, United States
| | - William Swain
- Department of Ophthalmology and Visual Sciences, Kellogg Eye Center, University of Michigan, Ann Arbor, Michigan, United States
| | - Antionette L Williams
- Department of Ophthalmology and Visual Sciences, Kellogg Eye Center, University of Michigan, Ann Arbor, Michigan, United States
| | - Brenda L Bohnsack
- Department of Ophthalmology and Visual Sciences, Kellogg Eye Center, University of Michigan, Ann Arbor, Michigan, United States
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6
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Tomlinson DJ, Erskine RM, Morse CI, Onambélé GL. Body Fat Percentage, Body Mass Index, Fat Mass Index and the Ageing Bone: Their Singular and Combined Roles Linked to Physical Activity and Diet. Nutrients 2019; 11:E195. [PMID: 30669348 PMCID: PMC6356293 DOI: 10.3390/nu11010195] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Revised: 12/20/2018] [Accepted: 01/16/2019] [Indexed: 12/17/2022] Open
Abstract
This study took a multi-analytical approach including group differences, correlations and unit-weighed directional z-score comparisons to identify the key mediators of bone health. A total of 190 participants (18⁻80 years) were categorized by body fat%, body mass index (BMI) and fat mass index (FMI) to examine the effect of differing obesity criteria on bone characteristics. A subset of 50 healthy-eating middle-to-older aged adults (44⁻80 years) was randomly selected to examine any added impact of lifestyle and inflammatory profiles. Diet was assessed using a 3-day food diary, bone mineral density (BMD) and content (BMC) by dual energy x-ray absorptiometry in the lumbar, thoracic, (upper and lower) appendicular and pelvic areas. Physical activity was assessed using the Baecke questionnaire, and endocrine profiling was assessed using multiplex luminometry. Obesity, classed via BMI, positively affected 20 out of 22 BMC- and BMD-related outcome measures, whereas FMI was associated with 14 outcome measures and adiposity only modulated nine out of 22 BMC- and BMD-related outcome measures. Whilst bivariate correlations only linked vitamin A and relative protein intake with BMD, the Z-score composite summary presented a significantly different overall dietary quality between healthy and osteopenic individuals. In addition, bivariate correlations from the subset revealed daily energy intake, sport-based physical activity and BMI positive mediators of seven out of 10 BMD sites with age and body fat% shown to be negative mediators of bone characteristics. In conclusion, whilst BMI is a good indicator of bone characteristics, high body fat% should also be the focus of osteoporosis risk with ageing. Interestingly, high BMI in conjunction with moderate to vigorous activity supplemented with an optimal diet (quality and quantity) are identified as positive modulators of bone heath.
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Affiliation(s)
- David J Tomlinson
- Musculoskeletal Sciences and Sport Medicine Research Centre, Manchester Metropolitan University, Crewe CW1 5DU, UK.
| | - Robert M Erskine
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool L3 3AF, UK.
- Institute of Sport, Exercise and Health, University College London, London W1T 7HA, UK.
| | - Christopher I Morse
- Musculoskeletal Sciences and Sport Medicine Research Centre, Manchester Metropolitan University, Crewe CW1 5DU, UK.
| | - Gladys L Onambélé
- Musculoskeletal Sciences and Sport Medicine Research Centre, Manchester Metropolitan University, Crewe CW1 5DU, UK.
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7
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Li XB, Liu T, Fan L, Gao Q, Peng Q, Cai T, Wang LM. Circulating serum level of retinoic acid and hip fractures among postmenopausal women. J Am Geriatr Soc 2018; 67:336-341. [PMID: 30517774 DOI: 10.1111/jgs.15667] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Revised: 09/28/2018] [Accepted: 09/28/2018] [Indexed: 11/27/2022]
Abstract
PURPOSE The aim of this study was to evaluate the serum levels of retinoic acid (RA), an active form of vitamin A, in postmenopausal women with hip fractures from Zhengzhou, China. METHODS This was a case-control study from the Affiliated Hospital of Zhengzhou University. Serum samples were drawn from 375 postmenopausal women who were diagnosed as having hip fracture and 750 matched controls without fracture. Serum RA levels were evaluated as both a continuous variable and a categorical variable in quintiles. RESULTS The results showed that the serum levels of RA were significantly (P = .039) higher in patients with hip fracture compared with controls. In univariate and multivariate logistic regression analysis, for each 1 ng/mL increase of serum level of RA, the unadjusted and adjusted risk of hip fracture would be increased by 5% (odds ratio [OR] = 1.05; 95% confidence interval [CI] = 1.00-1.10; P = .035) and 2% (OR = 1.02; 95% CI = 0.95-1.11; P = .096), respectively. In multivariate models comparing the fifth with the third quintiles of RA, the RA was associated with hip fracture, and adjusted risk of hip fracture would be increased by 52% (OR = 1.52; 95% CI = 1.13-1.42; P = .011). CONCLUSIONS The results of our study suggest that subclinical higher levels of RA may increase the risk of hip fracture in postmenopausal women, particularly among the top quintile of serum RA. J Am Geriatr Soc 67:336-341, 2019.
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Affiliation(s)
- Xiao-Bin Li
- Department of Orthopedics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China.,Department of Orthopedics, Henan Provincial People's Hospital, Zhengzhou, China
| | - Tao Liu
- Department of Orthopedics, Henan Provincial People's Hospital, Zhengzhou, China
| | - Lei Fan
- Department of Orthopedics, Henan Provincial People's Hospital, Zhengzhou, China
| | - Qiang Gao
- Department of Orthopedics, Henan Provincial People's Hospital, Zhengzhou, China
| | - Qiang Peng
- Department of Orthopedics, Henan Provincial People's Hospital, Zhengzhou, China
| | - Teng Cai
- Department of Orthopedics, Henan Provincial People's Hospital, Zhengzhou, China
| | - Li-Min Wang
- Department of Orthopedics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
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8
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Mozaffari H, Djafarian K, Mofrad MD, Shab-Bidar S. Dietary fat, saturated fatty acid, and monounsaturated fatty acid intakes and risk of bone fracture: a systematic review and meta-analysis of observational studies. Osteoporos Int 2018; 29:1949-1961. [PMID: 29947872 DOI: 10.1007/s00198-018-4540-7] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Accepted: 04/18/2018] [Indexed: 12/11/2022]
Abstract
Total dietary fat intake might influence the risk of fracture; however, conflicting findings have been reported to date. Moreover, the type of fatty acids is also of vital importance. We aimed to conduct a comprehensive review of the literature on the association between dietary fat intake, saturated fatty acids (SFAs), monounsaturated fatty acids (MUFAs), and the risk of fracture. PubMed and Scopus were used to conduct a comprehensive search for articles published up to 7 January 2018. To pool effect sizes, random effects models (the DerSimonian-Laird method) were applied. The Cochrane Q test was used to trace the source of between-study heterogeneity. Six studies met inclusion criteria for meta-analysis. We found no significant association between total dietary fat intake and risk of fracture (pooled effect size 1.31, 95% confidence interval (95% CI) 0.95-1.79, P = 0.09). A significant positive association was observed between SFA intake and the risk of hip fracture (pooled effect size 1.79, 95% CI 1.05-3.03, P = 0.03). There was also a significant positive association between MUFAs derived from animal sources and the risk of fracture (pooled effect size 2.29, 95% CI 1.50-3.50, P < 0.0001). Our findings showed a strong positive association between SFAs intake and risk of hip fracture. Moreover, there was a significant positive association between MUFAs derived from animal sources and the risk of fracture.
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Affiliation(s)
- H Mozaffari
- Department of Community Nutrition, School of Nutritional Sciences and Dietetics, Tehran University of Medical Sciences (TUMS), No 44, Hojjat-dost Alley, Naderi St., Keshavarz Blvd, Tehran, Iran
- Students' Scientific Research Center, Tehran University of Medical Sciences, Tehran, Iran
| | - K Djafarian
- Department of Clinical Nutrition, School of Nutritional Sciences and Dietetics, Tehran University of Medical Sciences (TUMS), Tehran, Iran
| | - M D Mofrad
- Department of Community Nutrition, School of Nutritional Sciences and Dietetics, Tehran University of Medical Sciences (TUMS), No 44, Hojjat-dost Alley, Naderi St., Keshavarz Blvd, Tehran, Iran
| | - S Shab-Bidar
- Department of Community Nutrition, School of Nutritional Sciences and Dietetics, Tehran University of Medical Sciences (TUMS), No 44, Hojjat-dost Alley, Naderi St., Keshavarz Blvd, Tehran, Iran.
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Effect of Quercetin on Bone Mineral Status and Markers of Bone Turnover in Retinoic Acid-Induced Osteoporosis. POL J FOOD NUTR SCI 2018. [DOI: 10.1515/pjfns-2017-0023] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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10
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Navarro-Valverde C, Caballero-Villarraso J, Mata-Granados JM, Casado-Díaz A, Sosa-Henríquez M, Malouf-Sierra J, Nogués-Solán X, Rodríguez-Mañas L, Cortés-Gil X, Delgadillo-Duarte J, Quesada-Gómez JM. High Serum Retinol as a Relevant Contributor to Low Bone Mineral Density in Postmenopausal Osteoporotic Women. Calcif Tissue Int 2018; 102:651-656. [PMID: 29294148 DOI: 10.1007/s00223-017-0379-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/21/2017] [Accepted: 12/27/2017] [Indexed: 10/18/2022]
Abstract
There is controversial information about the impact of vitamin A on bone. Some epidemiological studies show that excessive intake of vitamin A, or an excess of serum vitamin A, has related with adverse impact on bone mass; however, other studies did not find these links, and some authors have proposed that this vitamin might promote a better bone health. The present work aims to contribute to clarify the real role of vitamin A in bone tissue. For this purpose, a cross-sectional study of 154 osteoporotic non-treated postmenopausal women (> 65 years old) was carried out. Bone mineral density (BMD) was measured by dual-energy X-ray absorptiometry. We assessed concentrations of serum retinol, osteocalcin, parathyroid hormone, alkaline phosphatase, calcium, and phosphorus. We also studied demographic and anthropometric parameters. Spearman's correlations between retinol levels and other variables found negative correlations with BMD in both lumbar spine (R = - 0.162, P < 0.01) and femoral neck (R = - 0.182, P < 0.01), as well as alkaline phosphatase (R = - 0.110; P < 0.05) and phosphorus (R = - 0.110; P < 0.05). A positive correlation between retinol and fertile window was observed (R = 0.158; P < 0.01). After multivariable adjustment, we still found a negative correlation between serum retinol and BMD, both at the lumbar spine (R = - 0.210; P < 0.01) and at the femoral neck (R = - 0.324, P < 0.001). It is concluded that elevated serum-retinol levels are associated with an increased risk of low bone mass and thus with osteoporotic fractures. Therefore, osteoporosis-risk assessment should include quantification of serum metabolite of vitamin A.
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Affiliation(s)
| | - Javier Caballero-Villarraso
- IMIBIC (Instituto Maimónides de Investigación Biomédica de Córdoba)/Hospital Universitario Reina Sofía/ Universidad de Córdoba & RETICEF, CIBERFES (ISCIII), Córdoba, Spain.
| | - José M Mata-Granados
- IMIBIC (Instituto Maimónides de Investigación Biomédica de Córdoba)/Hospital Universitario Reina Sofía/ Universidad de Córdoba & RETICEF, CIBERFES (ISCIII), Córdoba, Spain
| | - Antonio Casado-Díaz
- IMIBIC (Instituto Maimónides de Investigación Biomédica de Córdoba)/Hospital Universitario Reina Sofía/ Universidad de Córdoba & RETICEF, CIBERFES (ISCIII), Córdoba, Spain
| | | | - Jorge Malouf-Sierra
- Servicio de Medicina Interna, Hospital de la Santa Creu i Sant Pau & RETICEF (ISCIII), Barcelona, Spain
| | - Xavier Nogués-Solán
- Servicio de Medicina Interna (Hospital del Mar Medical Research Institute), Universitat Autònoma de Barcelona & RETICEF, CIBERFES (ISCIII), Barcelona, Spain
| | - Leocadio Rodríguez-Mañas
- Fundación para la Investigación Biomédica, Servicio de Geriatría, Hospital Universitario de Getafe & RETICEF, CIBERFES (ISCIII), Madrid, Spain
| | | | - Joaquín Delgadillo-Duarte
- Departament de Farmacologia, de Terapèutica i de Toxicologia, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - José Manuel Quesada-Gómez
- IMIBIC (Instituto Maimónides de Investigación Biomédica de Córdoba)/Hospital Universitario Reina Sofía/ Universidad de Córdoba & RETICEF, CIBERFES (ISCIII), Córdoba, Spain
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Zhang X, Zhang R, Moore JB, Wang Y, Yan H, Wu Y, Tan A, Fu J, Shen Z, Qin G, Li R, Chen G. The Effect of Vitamin A on Fracture Risk: A Meta-Analysis of Cohort Studies. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2017; 14:ijerph14091043. [PMID: 28891953 PMCID: PMC5615580 DOI: 10.3390/ijerph14091043] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/29/2017] [Revised: 09/05/2017] [Accepted: 09/06/2017] [Indexed: 02/06/2023]
Abstract
This meta-analysis evaluated the influence of dietary intake and blood level of vitamin A (total vitamin A, retinol or β-carotene) on total and hip fracture risk. Cohort studies published before July 2017 were selected through English-language literature searches in several databases. Relative risk (RR) with corresponding 95% confidence interval (CI) was used to evaluate the risk. Heterogeneity was checked by Chi-square and I² test. Sensitivity analysis and publication bias were also performed. For the association between retinol intake and total fracture risk, we performed subgroup analysis by sex, region, case ascertainment, education level, age at menopause and vitamin D intake. R software was used to complete all statistical analyses. A total of 319,077 participants over the age of 20 years were included. Higher dietary intake of retinol and total vitamin A may slightly decrease total fracture risk (RR with 95% CI: 0.95 (0.91, 1.00) and 0.94 (0.88, 0.99), respectively), and increase hip fracture risk (RR with 95% CI: 1.40 (1.02, 1.91) and 1.29 (1.06, 1.57), respectively). Lower blood level of retinol may slightly increase total fracture risk (RR with 95% CI: 1.11 (0.94, 1.30)) and hip fracture risk (RR with 95% CI: 1.27 (1.05, 1.53)). In addition, higher β-carotene intake was weakly associated with the increased risk of total fracture (RR with 95% CI: 1.07 (0.97, 1.17)). Our data suggest that vitamin A intake and level may differentially influence the risks of total and hip fractures. Clinical trials are warranted to confirm these results and assess the clinical applicability.
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Affiliation(s)
- Xinge Zhang
- School of Health Sciences, Wuhan University, 115 Donghu Road, Wuhan 430071, China.
| | - Rui Zhang
- College of Life Sciences, South-Central University for Nationalities, Wuhan 430074, China.
| | - Justin B Moore
- Department of Family and Community Medicine, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, NC 27157, USA.
- Department of Epidemiology and Prevention, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, NC 27157, USA.
| | - Yueqiao Wang
- School of Health Sciences, Wuhan University, 115 Donghu Road, Wuhan 430071, China.
| | - Hanyi Yan
- School of Health Sciences, Wuhan University, 115 Donghu Road, Wuhan 430071, China.
| | - Yingru Wu
- School of Health Sciences, Wuhan University, 115 Donghu Road, Wuhan 430071, China.
| | - Anran Tan
- School of Health Sciences, Wuhan University, 115 Donghu Road, Wuhan 430071, China.
| | - Jialin Fu
- School of Health Sciences, Wuhan University, 115 Donghu Road, Wuhan 430071, China.
| | - Ziqiong Shen
- School of Health Sciences, Wuhan University, 115 Donghu Road, Wuhan 430071, China.
| | - Guiyu Qin
- School of Health Sciences, Wuhan University, 115 Donghu Road, Wuhan 430071, China.
| | - Rui Li
- School of Health Sciences, Wuhan University, 115 Donghu Road, Wuhan 430071, China.
| | - Guoxun Chen
- Department of Nutrition, The University of Tennessee, Knoxville, TN 37996, USA.
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12
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Excessive dietary intake of vitamin A reduces skull bone thickness in mice. PLoS One 2017; 12:e0176217. [PMID: 28426756 PMCID: PMC5398668 DOI: 10.1371/journal.pone.0176217] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2016] [Accepted: 04/09/2017] [Indexed: 01/05/2023] Open
Abstract
Calvarial thinning and skull bone defects have been reported in infants with hypervitaminosis A. These findings have also been described in humans, mice and zebrafish with loss-of-function mutations in the enzyme CYP26B1 that degrades retinoic acid (RA), the active metabolite of vitamin A, indicating that these effects are indeed caused by too high levels of vitamin A and that evolutionary conserved mechanisms are involved. To explore these mechanisms, we have fed young mice excessive doses of vitamin A for one week and then analyzed the skull bones using micro computed tomography, histomorphometry, histology and immunohistochemistry. In addition, we have examined the effect of RA on gene expression in osteoblasts in vitro. Compared to a standard diet, a high dietary intake of vitamin A resulted in a rapid and significant reduction in calvarial bone density and suture diastasis. The bone formation rate was almost halved. There was also increased staining of tartrate resistant acid phosphatase in osteocytes and an increased perilacunar matrix area, indicating osteocytic osteolysis. Consistent with this, RA induced genes associated with bone degradation in osteoblasts in vitro. Moreover, and in contrast to other known bone resorption stimulators, vitamin A induced osteoclastic bone resorption on the endocranial surfaces.
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13
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Kim S, Cho YS, Kim HM, Chung O, Kim H, Jho S, Seomun H, Kim J, Bang WY, Kim C, An J, Bae CH, Bhak Y, Jeon S, Yoon H, Kim Y, Jun J, Lee H, Cho S, Uphyrkina O, Kostyria A, Goodrich J, Miquelle D, Roelke M, Lewis J, Yurchenko A, Bankevich A, Cho J, Lee S, Edwards JS, Weber JA, Cook J, Kim S, Lee H, Manica A, Lee I, O'Brien SJ, Bhak J, Yeo JH. Comparison of carnivore, omnivore, and herbivore mammalian genomes with a new leopard assembly. Genome Biol 2016; 17:211. [PMID: 27802837 PMCID: PMC5090899 DOI: 10.1186/s13059-016-1071-4] [Citation(s) in RCA: 71] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2016] [Accepted: 09/22/2016] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND There are three main dietary groups in mammals: carnivores, omnivores, and herbivores. Currently, there is limited comparative genomics insight into the evolution of dietary specializations in mammals. Due to recent advances in sequencing technologies, we were able to perform in-depth whole genome analyses of representatives of these three dietary groups. RESULTS We investigated the evolution of carnivory by comparing 18 representative genomes from across Mammalia with carnivorous, omnivorous, and herbivorous dietary specializations, focusing on Felidae (domestic cat, tiger, lion, cheetah, and leopard), Hominidae, and Bovidae genomes. We generated a new high-quality leopard genome assembly, as well as two wild Amur leopard whole genomes. In addition to a clear contraction in gene families for starch and sucrose metabolism, the carnivore genomes showed evidence of shared evolutionary adaptations in genes associated with diet, muscle strength, agility, and other traits responsible for successful hunting and meat consumption. Additionally, an analysis of highly conserved regions at the family level revealed molecular signatures of dietary adaptation in each of Felidae, Hominidae, and Bovidae. However, unlike carnivores, omnivores and herbivores showed fewer shared adaptive signatures, indicating that carnivores are under strong selective pressure related to diet. Finally, felids showed recent reductions in genetic diversity associated with decreased population sizes, which may be due to the inflexible nature of their strict diet, highlighting their vulnerability and critical conservation status. CONCLUSIONS Our study provides a large-scale family level comparative genomic analysis to address genomic changes associated with dietary specialization. Our genomic analyses also provide useful resources for diet-related genetic and health research.
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Affiliation(s)
- Soonok Kim
- Biological and Genetic Resources Assessment Division, National Institute of Biological Resources, Incheon, 22689, Republic of Korea
| | - Yun Sung Cho
- The Genomics Institute, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea.,Department of Biomedical Engineering, School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea.,Personal Genomics Institute, Genome Research Foundation, Cheongju, 28160, Republic of Korea
| | - Hak-Min Kim
- The Genomics Institute, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea.,Department of Biomedical Engineering, School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - Oksung Chung
- Personal Genomics Institute, Genome Research Foundation, Cheongju, 28160, Republic of Korea
| | - Hyunho Kim
- Geromics, Ulsan, 44919, Republic of Korea
| | - Sungwoong Jho
- Personal Genomics Institute, Genome Research Foundation, Cheongju, 28160, Republic of Korea
| | - Hong Seomun
- Animal Resources Division, National Institute of Biological Resources, Incheon, 22689, Republic of Korea
| | - Jeongho Kim
- Cheongju Zoo, Cheongju, 28311, Republic of Korea
| | - Woo Young Bang
- Biological and Genetic Resources Assessment Division, National Institute of Biological Resources, Incheon, 22689, Republic of Korea
| | - Changmu Kim
- Biological and Genetic Resources Assessment Division, National Institute of Biological Resources, Incheon, 22689, Republic of Korea
| | - Junghwa An
- Animal Resources Division, National Institute of Biological Resources, Incheon, 22689, Republic of Korea
| | - Chang Hwan Bae
- Biological and Genetic Resources Assessment Division, National Institute of Biological Resources, Incheon, 22689, Republic of Korea
| | - Youngjune Bhak
- The Genomics Institute, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - Sungwon Jeon
- The Genomics Institute, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea.,Department of Biomedical Engineering, School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - Hyejun Yoon
- The Genomics Institute, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea.,Department of Biomedical Engineering, School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - Yumi Kim
- The Genomics Institute, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - JeHoon Jun
- Personal Genomics Institute, Genome Research Foundation, Cheongju, 28160, Republic of Korea.,Geromics, Ulsan, 44919, Republic of Korea
| | - HyeJin Lee
- Personal Genomics Institute, Genome Research Foundation, Cheongju, 28160, Republic of Korea.,Geromics, Ulsan, 44919, Republic of Korea
| | - Suan Cho
- Personal Genomics Institute, Genome Research Foundation, Cheongju, 28160, Republic of Korea.,Geromics, Ulsan, 44919, Republic of Korea
| | - Olga Uphyrkina
- Institute of Biology & Soil Science, Far Eastern Branch of Russian Academy of Sciences, Vladivostok, 690022, Russia
| | - Aleksey Kostyria
- Institute of Biology & Soil Science, Far Eastern Branch of Russian Academy of Sciences, Vladivostok, 690022, Russia
| | | | - Dale Miquelle
- Wildlife Conservation Society, 2300 Southern Boulevard, Bronx, NY, 10460, USA.,Department of Ecology, Far Eastern Federal University, Ayaks, Russki Island, Vladivostok, 690950, Russia
| | - Melody Roelke
- Laboratory of Animal Sciences Program, Leídos Biomedical Research Inc., Frederick National Laboratory, Frederick, MD, 21702, USA
| | - John Lewis
- International Zoo Veterinary Group (UK) IZVG LLP, Station House, Parkwood Street, Keighley, BD21 4NQ, UK
| | - Andrey Yurchenko
- Theodosius Dobzhansky Center for Genome Bioinformatics, St. Petersburg State University, St. Petersburg, 199004, Russia
| | - Anton Bankevich
- Center for Algorithmic Biotechnology, Institute for Translational Biomedicine, St. Petersburg State University, St. Petersburg, 199034, Russia
| | - Juok Cho
- Broad Institute of MIT and Harvard, Cambridge, MA, 02142, USA
| | - Semin Lee
- The Genomics Institute, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea.,Department of Biomedical Engineering, School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea.,Department of Biomedical Informatics, Harvard Medical School, Boston, MA, 02115, USA
| | - Jeremy S Edwards
- Chemistry and Chemical Biology, UNM Comprehensive Cancer Center, University of New Mexico, Albuquerque, NM, 87131, USA
| | - Jessica A Weber
- Department of Biology, University of New Mexico, Albuquerque, NM, 87131, USA
| | - Jo Cook
- Zoological Society of London, London, NW1 4RY, UK
| | - Sangsoo Kim
- Department of Bioinformatics & Life Science, Soongsil University, Seoul, 06978, Republic of Korea
| | - Hang Lee
- Conservation Genome Resource Bank for Korean Wildlife, College of Veterinary Medicine, Seoul National University, Seoul, 08826, Republic of Korea
| | - Andrea Manica
- Department of Zoology, University of Cambridge, Downing Street, Cambridge, CB2 3EJ, UK
| | - Ilbeum Lee
- Daejeon O-World, Daejeon, 35073, Republic of Korea
| | - Stephen J O'Brien
- Theodosius Dobzhansky Center for Genome Bioinformatics, St. Petersburg State University, St. Petersburg, 199004, Russia. .,Oceanographic Center 8000 N. Ocean Drive, Nova Southeastern University, Ft Lauderdale, FL, 33004, USA.
| | - Jong Bhak
- The Genomics Institute, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea. .,Department of Biomedical Engineering, School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea. .,Personal Genomics Institute, Genome Research Foundation, Cheongju, 28160, Republic of Korea. .,Geromics, Ulsan, 44919, Republic of Korea.
| | - Joo-Hong Yeo
- Biological and Genetic Resources Assessment Division, National Institute of Biological Resources, Incheon, 22689, Republic of Korea.
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14
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Yorgan TA, Heckt T, Rendenbach C, Helmis C, Seitz S, Streichert T, Amling M, Schinke T. Immediate effects of retinoic acid on gene expression in primary murine osteoblasts. J Bone Miner Metab 2016; 34:161-70. [PMID: 25956707 DOI: 10.1007/s00774-015-0666-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/18/2014] [Accepted: 02/16/2015] [Indexed: 10/23/2022]
Abstract
Consistent with clinical observations demonstrating that hypervitaminosis A is associated with increased skeletal fracture risk, we have previously found that dietary retinol deprivation partially corrects the bone mineralization defects in a mouse model of X-linked hypophosphatemic rickets. That retinol-dependent signaling pathways impact the skeleton is further supported by various findings demonstrating a negative influence of retinoic acid (RA) on bone-forming osteoblasts. We hypothesized that RA would directly regulate the expression of specific target genes in osteoblasts, and we aimed to identify these by genome-wide expression analyses. Here we show that high dietary retinol intake in mice causes low bone mass associated with increased osteoclastogenesis and decreased osteoblastogenesis, but intact bone matrix mineralization. We additionally found that short-term treatment of primary osteoblasts with RA causes a rapid induction of specific genes involved in either retinol-dependent signaling (i.e. Rara, Crabp2) or skeletal remodeling (i.e. Twist2, Tnfsf11). In contrast, neither expression of established osteoblast differentiation markers nor the proliferation rate was immediately affected by RA administration. Collectively, our data suggest that the negative effects of vitamin A on skeletal integrity are explainable by an immediate influence of RA signaling on specific genes in osteoblasts that in turn influence bone remodeling.
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Affiliation(s)
- Timur A Yorgan
- Department of Osteology and Biomechanics, University Medical Center Hamburg Eppendorf, Hamburg, Germany
| | - Timo Heckt
- Department of Osteology and Biomechanics, University Medical Center Hamburg Eppendorf, Hamburg, Germany
| | - Carsten Rendenbach
- Department of Osteology and Biomechanics, University Medical Center Hamburg Eppendorf, Hamburg, Germany
| | - Christina Helmis
- Department of Osteology and Biomechanics, University Medical Center Hamburg Eppendorf, Hamburg, Germany
| | - Sebastian Seitz
- Department of Osteology and Biomechanics, University Medical Center Hamburg Eppendorf, Hamburg, Germany
| | - Thomas Streichert
- Department of Clinical Chemistry, University Medical Center Hamburg Eppendorf, Hamburg, Germany
| | - Michael Amling
- Department of Osteology and Biomechanics, University Medical Center Hamburg Eppendorf, Hamburg, Germany
| | - Thorsten Schinke
- Department of Osteology and Biomechanics, University Medical Center Hamburg Eppendorf, Hamburg, Germany.
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15
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Green AC, Martin TJ, Purton LE. The role of vitamin A and retinoic acid receptor signaling in post-natal maintenance of bone. J Steroid Biochem Mol Biol 2016; 155:135-46. [PMID: 26435449 DOI: 10.1016/j.jsbmb.2015.09.036] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/19/2015] [Revised: 09/24/2015] [Accepted: 09/26/2015] [Indexed: 12/11/2022]
Abstract
Vitamin A and retinoid derivatives are recognized as morphogens that govern body patterning and skeletogenesis, producing profound defects when in excess. In post-natal bone, both high and low levels of vitamin A are associated with poor bone heath and elevated risk of fractures. Despite this, the precise mechanism of how retinoids induce post-natal bone changes remains elusive. Numerous studies have been performed to discover how retinoids induce these changes, revealing a complex morphogenic regulation of bone through interplay of different cell types. This review will discuss the direct and indirect effects of retinoids on mediators of bone turnover focusing on differentiation and activity of osteoblasts and osteoclasts and explains why some discrepancies in this field have arisen. Importantly, the overall effect of retinoids on the skeleton is highly site-specific, likely due to differential regulation of osteoblasts and osteoclasts at trabecular vs. cortical periosteal and endosteal bone surfaces. Further investigation is required to discover the direct gene targets of retinoic acid receptors (RARs) and molecular mechanisms through which these changes occur. A clear role for RARs in regulating bone is now accepted and the therapeutic potential of retinoids in treating bone diseases has been established.
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Affiliation(s)
- Alanna C Green
- St Vincent's Institute, Fitzroy, Victoria 3065, Australia; Department of Medicine at St. Vincent's Hospital, The University of Melbourne, Victoria 3065, Australia.
| | - T John Martin
- St Vincent's Institute, Fitzroy, Victoria 3065, Australia; Department of Medicine at St. Vincent's Hospital, The University of Melbourne, Victoria 3065, Australia
| | - Louise E Purton
- St Vincent's Institute, Fitzroy, Victoria 3065, Australia; Department of Medicine at St. Vincent's Hospital, The University of Melbourne, Victoria 3065, Australia
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16
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Manickavasagar B, McArdle AJ, Yadav P, Shaw V, Dixon M, Blomhoff R, Connor GO, Rees L, Ledermann S, van’t Hoff W, Shroff R. Hypervitaminosis A is prevalent in children with CKD and contributes to hypercalcemia. Pediatr Nephrol 2015; 30:317-25. [PMID: 25119682 PMCID: PMC4282719 DOI: 10.1007/s00467-014-2916-2] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/25/2014] [Revised: 05/24/2014] [Accepted: 07/14/2014] [Indexed: 11/03/2022]
Abstract
BACKGROUND Vitamin A accumulates in renal failure, but the prevalence of hypervitaminosis A in children with predialysis chronic kidney disease (CKD) is not known. Hypervitaminosis A has been associated with hypercalcemia. In this study we compared dietary vitamin A intake with serum retinoid levels and their associations with hypercalcemia. METHODS We studied the relationship between vitamin A intake, serum retinoid levels, and serum calcium in 105 children with CKD stages 2-5 on dialysis and posttransplant. Serum retinoid measures included retinol (ROH), its active retinoic acid (RA) metabolites [all-trans RA (at-RA) and 13-cis RA] and carrier proteins [retinol-binding protein-4 (RBP4) and transthyretin (TTR)]. Dietary vitamin A intake was assessed using a food diary. RESULTS Twenty-five children were in CKD 2-3, 35 in CKD 4-5, 23 on dialysis and 22 posttransplant; 53 % had vitamin A intake above the Reference Nutrient Intake (RNI) value. Children receiving supplemental feeds compared with diet alone had higher vitamin A intake (p = 0.02) and higher serum ROH (p < 0.001). Notably, increased ROH was seen as early as CKD stage 2. For every 10 ml/min/1.73 m(2) fall in estimated glomerular filtration rate (eGFR), there was a 13 % increase in ROH. RBP4 levels were increased in CKD 3-5 and dialysis patients. The lowest ratios of ROH:RBP4 were seen in dialysis compared with CKD 2-3 (p = 0.03), suggesting a relative increase in circulating RBP4. Serum ROH, RBP4 and at-RA were associated with serum calcium. On multivariable analysis RBP4 levels and alfacalcidol dose were significant predictors of serum calcium (model R (2) 32 %) in dialysis patients. CONCLUSIONS Hypervitaminosis A is seen in early CKD, with highest levels in children on supplemental feeds compared with diet alone. Serum retinoid levels significantly predict hypercalcemia.
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Affiliation(s)
- Baheerathi Manickavasagar
- Department of Dietetics, Great Ormond Street Hospital for Children NHS Foundation Trust, London, United Kingdom
| | - Andrew J. McArdle
- Nephrology, Great Ormond Street Hospital for Children NHS Foundation Trust, London, United Kingdom
| | - Pallavi Yadav
- Nephrology, Great Ormond Street Hospital for Children NHS Foundation Trust, London, United Kingdom
| | - Vanessa Shaw
- Department of Dietetics, Great Ormond Street Hospital for Children NHS Foundation Trust, London, United Kingdom
| | - Marjorie Dixon
- Department of Dietetics, Great Ormond Street Hospital for Children NHS Foundation Trust, London, United Kingdom
| | - Rune Blomhoff
- Department of Nutrition, University of Oslo, Oslo, Norway
| | - Graeme O’ Connor
- Department of Dietetics, Great Ormond Street Hospital for Children NHS Foundation Trust, London, United Kingdom
| | - Lesley Rees
- Nephrology, Great Ormond Street Hospital for Children NHS Foundation Trust, London, United Kingdom
| | - Sarah Ledermann
- Nephrology, Great Ormond Street Hospital for Children NHS Foundation Trust, London, United Kingdom
| | - William van’t Hoff
- Nephrology, Great Ormond Street Hospital for Children NHS Foundation Trust, London, United Kingdom
| | - Rukshana Shroff
- Nephrology, Great Ormond Street Hospital for Children NHS Foundation Trust, London, United Kingdom
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17
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Henning P, Conaway HH, Lerner UH. Retinoid receptors in bone and their role in bone remodeling. Front Endocrinol (Lausanne) 2015; 6:31. [PMID: 25814978 PMCID: PMC4356160 DOI: 10.3389/fendo.2015.00031] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/19/2014] [Accepted: 02/22/2015] [Indexed: 11/23/2022] Open
Abstract
Vitamin A (retinol) is a necessary and important constituent of the body which is provided by food intake of retinyl esters and carotenoids. Vitamin A is known best for being important for vision, but in addition to the eye, vitamin A is necessary in numerous other organs in the body, including the skeleton. Vitamin A is converted to an active compound, all-trans-retinoic acid (ATRA), which is responsible for most of its biological actions. ATRA binds to intracellular nuclear receptors called retinoic acid receptors (RARα, RARβ, RARγ). RARs and closely related retinoid X receptors (RXRα, RXRβ, RXRγ) form heterodimers which bind to DNA and function as ligand-activated transcription factors. It has been known for many years that hypervitaminosis A promotes skeleton fragility by increasing osteoclast formation and decreasing cortical bone mass. Some epidemiological studies have suggested that increased intake of vitamin A and increased serum levels of retinoids may decrease bone mineral density and increase fracture rate, but the literature on this is not conclusive. The current review summarizes how vitamin A is taken up by the intestine, metabolized, stored in the liver, and processed to ATRA. ATRA's effects on formation and activity of osteoclasts and osteoblasts are outlined, and a summary of clinical data pertaining to vitamin A and bone is presented.
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Affiliation(s)
- Petra Henning
- Centre for Bone and Arthritis Research, Institute for Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - H. Herschel Conaway
- Department of Physiology and Biophysics, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - Ulf H. Lerner
- Centre for Bone and Arthritis Research, Institute for Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
- Department of Molecular Periodontology, Umeå University, Umeå, Sweden
- *Correspondence: Ulf H. Lerner, Centre for Bone and Arthritis Research, Institute for Medicine, Sahlgrenska Academy, University of Gothenburg, Vita Straket 11, 413 45 Gothenburg, Sweden e-mail:
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18
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Jin Z, Li X, Wan Y. Minireview: nuclear receptor regulation of osteoclast and bone remodeling. Mol Endocrinol 2014; 29:172-86. [PMID: 25549044 DOI: 10.1210/me.2014-1316] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Osteoclasts are bone-resorbing cells essential for skeletal remodeling and regeneration. However, excessive osteoclasts often contribute to prevalent bone degenerative diseases such as osteoporosis, arthritis, and cancer bone metastasis. Osteoclast dysregulation is also associated with rare disorders such as osteopetrosis, pycnodysostosis, Paget's disease, and Gorham-Stout syndrome. The nuclear receptor (NR) family of transcription factors functions as metabolic sensors that control a variety of physiological processes including skeletal homeostasis and serves as attractive therapeutic targets for many diseases. In this review, we highlight recent findings on the new players and the new mechanisms for how NRs regulate osteoclast differentiation and bone resorption. An enhanced understanding of NR functions in osteoclastogenesis will facilitate the development of not only novel osteoprotective medicine but also prudent strategies to minimize the adverse skeletal effects of certain NR-targeting drugs for a better treatment of cancer and metabolic diseases.
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Affiliation(s)
- Zixue Jin
- Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, Texas 75390
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19
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Wu AM, Huang CQ, Lin ZK, Tian NF, Ni WF, Wang XY, Xu HZ, Chi YL. The relationship between vitamin A and risk of fracture: meta-analysis of prospective studies. J Bone Miner Res 2014; 29:2032-9. [PMID: 24700407 DOI: 10.1002/jbmr.2237] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/03/2014] [Revised: 03/16/2014] [Accepted: 03/26/2014] [Indexed: 11/06/2022]
Abstract
Osteoporotic fracture is a significant cause of morbidity and mortality and is a challenging global health problem. Previous reports of the relation between vitamin A intake or blood retinol and risk of fracture were inconsistent. We searched Medline and Embase to assess the effects of vitamin A (or retinol or beta-carotene but not vitamin A metabolites) on risk of hip and total fracture. Only prospective studies were included. We pooled data with a random effects meta-analysis with adjusted relative risk (adj.RR) and 95% confidence interval (CI). We used Q statistic and I(2) statistic to assess heterogeneity and Egger's test to assess publication bias. Eight vitamin A (or retinol or beta-carotene) intake studies (283,930 participants) and four blood retinol level prospective studies (8725 participants) were included. High intake of vitamin A and retinol were shown to increase risk of hip fracture (adj.RR [95% CI] = 1.29 [1.07, 1.57] and 1.40 [1.03, 1.91], respectively), whereas beta-carotene intake was not found to increase the risk of hip fracture (adj.RR [95% CI] = 0.82 [0.59, 1.14]). Both high or low level of blood retinol was shown to increase the risk of hip fracture (adj.RR [95% CI] = 1.87 [1.31, 2.65] and 1.56 [1.09, 2.22], respectively). The risk of total fracture does not differ significantly by level of vitamin A (or retinol) intake or by blood retinol level. Dose-response meta-analysis shows a U-shaped relationship between serum retinol level and hip fracture risk. Our meta-analysis suggests that blood retinol level is a double-edged sword for risk of hip fracture. To avoid the risk of hip fracture caused by too low or too high a level of retinol concentration, we suggest that intake of beta-carotene (a provitamin A), which should be converted to retinol in blood, may be better than intake of retinol from meat, which is directly absorbed into blood after intake.
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Affiliation(s)
- Ai-Min Wu
- Department of Orthopaedics, Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
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20
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Abstract
Vitamin A (retinol) is ingested as either retinyl esters or carotenoids and metabolized to active compounds such as 11-cis-retinal, which is important for vision, and all-trans-retinoic acid, which is the primary mediator of biological actions of vitamin A. All-trans-retinoic acid binds to retinoic acid receptors (RARs), which heterodimerize with retinoid X receptors. RAR-retinoid X receptor heterodimers function as transcription factors, binding RAR-responsive elements in promoters of different genes. Numerous cellular functions, including bone cell functions, are mediated by vitamin A; however, it has long been recognized that increased levels of vitamin A can have deleterious effects on bone, resulting in increased skeletal fragility. Bone mass is dependent on the balance between bone resorption and bone formation. A decrease in bone mass may be caused by either an excess of resorption or decreased bone formation. Early studies indicated that the primary skeletal effect of vitamin A was to increase bone resorption, but later studies have shown that vitamin A can not only stimulate the formation of bone-resorbing osteoclasts but also inhibit their formation. Effects of vitamin A on bone formation have not been studied in as great a detail and are not as well characterized as effects on bone resorption. Several epidemiological studies have shown an association between vitamin A, decreased bone mass, and osteoporotic fractures, but the data are not conclusive because other studies have found no associations, and some studies have suggested that vitamin A primarily promotes skeletal health. In this presentation, we have summarized how vitamin A is absorbed and metabolized and how it functions intracellularly. Vitamin A deficiency and excess are introduced, and detailed descriptions of clinical and preclinical studies of the effects of vitamin A on the skeleton are presented.
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Affiliation(s)
- H Herschel Conaway
- Department of Molecular Periodontology, University of Umeå, SE-901 87 Umeå, Sweden.
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Mata-Granados JM, Cuenca-Acevedo R, Luque de Castro MD, Sosa M, Quesada-Gómez JM. Vitamin D deficiency and high serum levels of vitamin A increase the risk of osteoporosis evaluated by Quantitative Ultrasound Measurements (QUS) in postmenopausal Spanish women. Clin Biochem 2010; 43:1064-8. [PMID: 20599880 DOI: 10.1016/j.clinbiochem.2010.06.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2010] [Revised: 05/21/2010] [Accepted: 06/05/2010] [Indexed: 10/19/2022]
Abstract
OBJECTIVES Association between vitamin D deficiency and excess of vitamin A as a potential risk factor of osteoporosis and fracture has been evaluated. DESIGN AND METHODS 232 healthy postmenopausal women were studied. Serum parameters were analyzed by standard methods and fat-soluble vitamins by an own HPLC method. QUS measurement of the calcaneal bone was carried out by Sahara. RESULTS 124 patients were considered non-osteoporotic and 101 (44.9%) were osteoporotic. The prevalence of high serum levels of retinol was 36.4% and vitamin D deficiency was 70.1%. 60.4% of women with vitamin D deficiency have high serum levels of retinol. In the whole population, the increased risk of osteoporosis was up to three times higher for the highest retinol quintile, as compared with the lowest retinol quintile. Whereas in women with vitamin D deficiency the risk of osteoporosis increased was up 5 times higher than women in the lowest quintile of retinol. CONCLUSIONS Our results show that high retinol levels together with vitamin D deficiency are hitherto an overlooked risk factor for osteoporosis.
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Affiliation(s)
- J M Mata-Granados
- Unit of Investigation, Development and Initiatives, Sanyres, Córdoba, Spain; Mineral Metabolism Unit, Endocrinology Service, Hospital University Reina Sofía, Córdoba, Spain
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22
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Caire-Juvera G, Ritenbaugh C, Wactawski-Wende J, Snetselaar LG, Chen Z. Vitamin A and retinol intakes and the risk of fractures among participants of the Women's Health Initiative Observational Study. Am J Clin Nutr 2009; 89:323-30. [PMID: 19056568 PMCID: PMC2715292 DOI: 10.3945/ajcn.2008.26451] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2008] [Accepted: 09/23/2008] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Excessive intakes of vitamin A have been shown to have adverse skeletal effects in animals. High vitamin A intake may lead to an increased risk of fracture in humans. OBJECTIVE The objective was to evaluate the relation between total vitamin A and retinol intakes and the risk of incident total and hip fracture in postmenopausal women. DESIGN A total of 75,747 women from the Women's Health Initiative Observational Study participated. The risk of hip and total fractures was determined using Cox proportional hazards models according to different intakes of vitamin A and retinol. RESULTS In the analysis adjusted for some covariates (age; protein, vitamin D, vitamin K, calcium, caffeine, and alcohol intakes; body mass index; hormone therapy use; smoking; metabolic equivalents hours per week; ethnicity; and region of clinical center), the association between vitamin A intake and the risk of fracture was not statistically significant. Analyses for retinol showed similar trends. When the interaction term was analyzed as categorical, the highest intake of retinol with vitamin D was significant (P = 0.033). Women with lower vitamin D intake (< or =11 microg/d) in the highest quintile of intake of both vitamin A (hazard ratio: 1.19; 95% CI: 1.04, 1.37; P for trend: 0.022) and retinol (hazard ratio: 1.15; 95% CI: 1.03, 1.29; P for trend: 0.056) had a modest increased risk of total fracture. CONCLUSIONS No association between vitamin A or retinol intake and the risk of hip or total fractures was observed in postmenopausal women. Only a modest increase in total fracture risk with high vitamin A and retinol intakes was observed in the low vitamin D-intake group.
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Affiliation(s)
- Graciela Caire-Juvera
- Nutrition Department, Centro de Investigación en Alimentación y Desarrollo, Hermosillo, Sonora, Mexico.
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Ribaya-Mercado JD, Blumberg JB. Vitamin A: is it a risk factor for osteoporosis and bone fracture? Nutr Rev 2007; 65:425-38. [PMID: 17972437 DOI: 10.1111/j.1753-4887.2007.tb00268.x] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Results from observational studies of the association between vitamin A intake or serum concentration and bone mineral density or fracture are mixed. The inconsistencies may be due, in part, to difficulties in obtaining an accurate assessment of vitamin A intake or status. Serum retinol is a poor measure of vitamin A status because it is subject to homeostatic control. Stable-isotope-dilution methodology gives a validated assessment of the total-body and liver vitamin A stores and is recommended in future studies on vitamin A status and osteoporosis. The potential for exacerbating an already serious public health problem with intakes of vitamin A currently considered safe indicates further research into this matter is warranted.
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Affiliation(s)
- Judy D Ribaya-Mercado
- J Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, 711 Washington Street, Boston, MA 02111, USA.
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24
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van Beek E, Löwik C, Karperien M, Papapoulos S. Independent pathways in the modulation of osteoclastic resorption by intermediates of the mevalonate biosynthetic pathway: the role of the retinoic acid receptor. Bone 2006; 38:167-71. [PMID: 16165408 DOI: 10.1016/j.bone.2005.08.011] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2005] [Revised: 08/11/2005] [Accepted: 08/12/2005] [Indexed: 11/29/2022]
Abstract
Geranylgeranyl pyrophosphate (GGPP) and geranylgeraniol (GGOH) are used for the prenylation of GTP binding proteins and can reverse the antiresorptive action of nitrogen-containing bisphosphonates which inhibit farnesyl pyrophosphate synthase, an enzyme of the mevalonate pathway involved in the formation of GGPP. Previously, in cultures of fetal mouse long bones, we showed that GGOH stimulates osteoclastic bone resorption, but the cellular and molecular mode of action is not known. In cell homogenates, it has been found that GGOH can be metabolized to geranylgeranoic acid (GGA) which, like retinoic acid (RA), is a stimulator of retinoic acid receptor (RAR) expression. For this, we examined the involvement of the RAR in the action of GGOH on bone resorption. We show here that RA, GGOH, GGPP and GGA stimulate osteoclastic bone resorption and that this action is reversed by the RAR antagonist AGN-193109. These findings indicate the functional involvement of the RAR in the action of these polyisoprenoids. Moreover, RA, GGOH and GGA all stimulated RARbeta mRNA expression in bone explants. However, in contrast to GGOH and GGPP, GGA was not able to reverse the antiresorptive action of ibandronate, a nitrogen-containing bisphosphonate, suggesting that GGA is not involved in protein prenylation. In conclusion, our studies show that both GGOH and GGPP, independent of protein prenylation, stimulate osteoclastic bone resorption via RAR, probably via metabolism into GGA. Identification of such mechanism can help in the better understanding of the role of this metabolic pathway in the regulation of the activity and survival of osteoclasts.
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Affiliation(s)
- Ermond van Beek
- Department of Endocrinology and Metabolic Diseases, C4-R, Leiden University Medical Center, Albinusdreef 2, 2333 ZA Leiden, The Netherlands.
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25
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Abstract
OBJECTIVE To describe current data evaluating the effect of vitamin A intake on fracture risk. DATA SOURCES A literature search using MEDLINE (1966-March 2005) was conducted using the search terms bone density, fractures, osteoporosis, retinol, and vitamin A to identify published studies evaluating the effects of vitamin A on bone. DATA SYNTHESIS Studies evaluating vitamin A consumption and fracture risk were reviewed. Current data suggest a potential inverse relationship between excess vitamin A consumption and bone mineral density leading to an increased risk for fracture. CONCLUSIONS Although current data are limited, consumption of large amounts of vitamin A may be associated with decreased bone mineral density and increased fracture risk. Until further information is available, patients should be made aware of the potential risks of consuming vitamin A in amounts that exceed the recommended dietary allowance. Further research is needed to clarify the relationship between vitamin A and fracture risk.
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Affiliation(s)
- Heather A Jackson
- Purdue University/Clarian Health Partners, Indianapolis, IN 46202, USA.
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26
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Rejnmark L, Vestergaard P, Charles P, Hermann AP, Brot C, Eiken P, Mosekilde L. No effect of vitamin A intake on bone mineral density and fracture risk in perimenopausal women. Osteoporos Int 2004; 15:872-80. [PMID: 15034644 DOI: 10.1007/s00198-004-1618-1] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/27/2003] [Accepted: 02/19/2004] [Indexed: 11/25/2022]
Abstract
In recent studies from Sweden and the United States, a high vitamin A intake has been associated with low bone mineral density (BMD) and increased fracture risk. In Sweden and the United States, food items such as milk and breakfast cereals are fortified with vitamin A, whereas in Denmark there is no mandatory fortification with vitamin A. In the present study, we investigated relations between vitamin A intake and BMD and fracture risk in a Danish population consuming mostly unfortified food items. Within a population-based cohort study in 2,016 perimenopausal women, associations between BMD and vitamin A intake were assessed at baseline and after 5-year follow-up. Moreover, associations between baseline vitamin A intake and 5-year changes in BMD were studied. Finally, fracture risk was assessed in relation to vitamin A intake. In our cohort, dietary retinol intake (0.53 mg/day) was lower than the intake reported in recent studies form Sweden (0.78 mg/day) and the United States (1.66 mg/day). Cross-sectional and longitudinal analyses showed no associations between intake of vitamin A and BMD of the femoral neck or lumbar spine. Neither did BMD differ between those 5% who had the highest, and those 5% who had the lowest, vitamin A intake. During the 5-year study period, 163 subjects sustained a fracture (cases). Compared to 978 controls, logistic regression analyses revealed no difference in vitamin A intake. Thus, in a Danish population, average vitamin A intake is lower than in Sweden and the United States and not associated with detrimental effects on bone.
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Affiliation(s)
- L Rejnmark
- Department of Endocrinology and Metabolism C, Aarhus Amtssygehus, Aarhus University Hospital, Tage-Hansens Gade 2, 8000 Aarhus, Denmark.
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27
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Lim LS, Harnack LJ, Lazovich D, Folsom AR. Vitamin A intake and the risk of hip fracture in postmenopausal women: the Iowa Women's Health Study. Osteoporos Int 2004; 15:552-9. [PMID: 14760518 PMCID: PMC2020807 DOI: 10.1007/s00198-003-1577-y] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Excessive intake of vitamin A is postulated to have a detrimental effect on bone by inducing osteoporosis. This may lead to an increased risk of fracture, particularly in persons who are already at risk of osteoporosis. However, few studies have specifically examined the association of vitamin A intake through diet and supplement use, with fractures in a cohort of older, community-dwelling women. We prospectively followed a cohort of 34,703 postmenopausal women from the Iowa Women's Health Study to determine if high levels of vitamin A and retinol intake through food and supplement use were associated with an increased risk of hip or all fractures. A semiquantitative food frequency questionnaire was used to obtain the participants' baseline vitamin A and retinol intake. Participants were followed for a mean duration of 9.5 years for incident self-reported hip and nonhip fractures. After multivariate adjustment, it was revealed that users of supplements containing vitamin A had a 1.18-fold increased risk of incident hip fracture (n = 525) compared with nonusers (95% CI, 0.99 to 1.41), but there was no evidence of an increased risk of all fractures (n = 6,502) among supplement users. There was also no evidence of a dose-response relationship in hip fracture risk with increasing amounts of vitamin A or retinol from supplements. Furthermore, our results showed no association between vitamin A or retinol intake from food and supplements, or food only, and the risk of hip or all fractures. In conclusion, we found little evidence of an increased risk of hip or all fractures with higher intakes of vitamin A or retinol among a cohort of older, postmenopausal women.
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Affiliation(s)
- L S Lim
- School of Public Health, Division of Epidemiology, University of Minnesota, Minneapolis, MN 55454, USA
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28
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Song HM, Nacamuli RP, Xia W, Bari AS, Shi YY, Fang TD, Longaker MT. High-dose retinoic acid modulates rat calvarial osteoblast biology. J Cell Physiol 2004; 202:255-62. [PMID: 15389522 DOI: 10.1002/jcp.20115] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Retinoic acid has been shown to adversely affect craniofacial development. Cleft palate and craniosynostosis are two examples of craniofacial defects associated with prenatal exposure to this agent. Although the effects of retinoic acid on cephalic neural crest-derived tissues have previously been studied, the specific effects of retinoic acid on the cellular biology of osteoblasts remain unclear. The purpose of this study was to analyze in detail the effects of pharmacologic doses of retinoic acid on the differentiation and proliferation of osteoblasts derived from an intramembranous source. Primary rat calvarial osteoblasts were established in culture and treated with 1 or 10 microM all-trans-retinoic acid. Retinoic acid treatment markedly increased expression of osteopontin up to 48 h after stimulation. Consistent with this early stage of differentiation, both mRNA and protein analysis of FGF receptor isoforms demonstrated a switch in predominance from fibroblast growth factor receptor 2 (fgfr2) to fgfr1. Analysis of PCNA protein confirmed inhibition of proliferation by retinoic acid. To determine whether these alterations in osteoblast biology would lead to increased differentiation, we examined short term [alkaline phosphatase (AP) activity] and long term (von Kossa staining) surrogates of bone formation in vitro. These assays confirmed that retinoic acid increased osteogenesis, with a 4-fold increase in bone nodule formation in cells treated with 10 microM retinoic acid after 28 days. Overall, our results demonstrated that pharmacologic doses of all-trans-retinoic acid decreased osteoblast proliferation and increased differentiation, suggesting that retinoic acid may effect craniofacial development by pathologically enhancing osteogenesis.
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MESH Headings
- Alkaline Phosphatase/drug effects
- Alkaline Phosphatase/physiology
- Animals
- Animals, Newborn
- Cell Differentiation/drug effects
- Cell Differentiation/physiology
- Cell Proliferation/drug effects
- Cells, Cultured
- Dose-Response Relationship, Drug
- Female
- Maxillofacial Abnormalities/chemically induced
- Maxillofacial Abnormalities/metabolism
- Maxillofacial Abnormalities/physiopathology
- Maxillofacial Development/drug effects
- Maxillofacial Development/physiology
- Osteoblasts/drug effects
- Osteoblasts/metabolism
- Osteopontin
- Pregnancy
- Prenatal Exposure Delayed Effects
- Proliferating Cell Nuclear Antigen/drug effects
- Proliferating Cell Nuclear Antigen/metabolism
- Rats
- Rats, Sprague-Dawley
- Receptor Protein-Tyrosine Kinases/drug effects
- Receptor Protein-Tyrosine Kinases/metabolism
- Receptor, Fibroblast Growth Factor, Type 1
- Receptor, Fibroblast Growth Factor, Type 2
- Receptors, Fibroblast Growth Factor/drug effects
- Receptors, Fibroblast Growth Factor/metabolism
- Sialoglycoproteins/drug effects
- Sialoglycoproteins/metabolism
- Skull/cytology
- Skull/drug effects
- Skull/growth & development
- Tretinoin/pharmacology
- Up-Regulation/drug effects
- Up-Regulation/physiology
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Affiliation(s)
- Hanjoon M Song
- The Department of Surgery, Stanford University School of Medicine, Stanford, California 94305-5148, USA
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29
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Perrotta S, Nobili B, Rossi F, Di Pinto D, Cucciolla V, Borriello A, Oliva A, Della Ragione F. Vitamin A and infancy. Biochemical, functional, and clinical aspects. VITAMINS AND HORMONES 2003; 66:457-591. [PMID: 12852263 DOI: 10.1016/s0083-6729(03)01013-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Vitamin A is a very intriguing natural compound. The molecule not only has a complex array of physiological functions, but also represents the precursor of promising and powerful new pharmacological agents. Although several aspects of human retinol metabolism, including absorption and tissue delivery, have been clarified, the type and amounts of vitamin A derivatives that are intracellularly produced remain quite elusive. In addition, their precise function and targets still need to be identified. Retinoic acids, undoubtedly, play a major role in explaining activities of retinol, but, recently, a large number of physiological functions have been attributed to different retinoids and to vitamin A itself. One of the primary roles this vitamin plays is in embryogenesis. Almost all steps in organogenesis are controlled by retinoic acids, thus suggesting that retinol is necessary for proper development of embryonic tissues. These considerations point to the dramatic importance of a sufficient intake of vitamin A and explain the consequences if intake of retinol is deficient. However, hypervitaminosis A also has a number of remarkable negative consequences, which, in same cases, could be fatal. Thus, the use of large doses of retinol in the treatment of some human diseases and the use of megavitamin therapy for certain chronic disorders as well as the growing tendency toward vitamin faddism should alert physicians to the possibility of vitamin overdose.
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Affiliation(s)
- Silverio Perrotta
- Department of Pediatric, Medical School, Second University of Naples, Naples, Italy
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30
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Penniston KL, Valentine AR, Tanumihardjo SA. A theoretical increase in infants' hepatic vitamin a is realized using a supplemented lactating sow model. J Nutr 2003; 133:1139-42. [PMID: 12672932 DOI: 10.1093/jn/133.4.1139] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Vitamin A deficiency (VAD) is a public health problem affecting millions in developing nations. Supplementation for lactating women, whose needs are high, involves large oral doses of the preformed vitamin. The safety and efficacy of these doses has been inadequately studied. Lactating women typically receive 210 micro mol of retinyl ester during early lactation, but 420 micro mol has also been administered. If larger doses of vitamin A are not significantly more effective in preventing VAD in mothers and infants, then smaller doses would be recommended. We therefore examined the vitamin A concentration of milk from lactating sows (n = 15) that were provided two different doses of vitamin A (i.e., 1050 or 2100 micro mol, n = 6/group) or corn oil (n = 3), corresponding to doses given women on the basis of body weight. Compared with controls, an overall significant treatment effect was found (P = 0.0019), but there was no difference in milk concentration between treatment groups. Theoretically, applying the mean milk vitamin A concentrations of the groups through 12 h and values to 48 h from 4 sows, we estimate that an infant of a supplemented mother could realize an increase of +0.08 or 0.16 micro mol/g liver from the low or high dose, respectively.
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Affiliation(s)
- Kristina L Penniston
- Integrated Graduate Program in Nutritional Sciences, University of Wisconsin-Madison, 53706, USA
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31
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Promislow JHE, Goodman-Gruen D, Slymen DJ, Barrett-Connor E. Retinol intake and bone mineral density in the elderly: the Rancho Bernardo Study. J Bone Miner Res 2002; 17:1349-58. [PMID: 12162487 DOI: 10.1359/jbmr.2002.17.8.1349] [Citation(s) in RCA: 170] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Retinol is involved in bone remodeling, and excessive intake has been linked to bone demineralization, yet its role in osteoporosis has received little evaluation. We studied the associations of retinol intake with bone mineral density (BMD) and bone maintenance in an ambulatory community-dwelling cohort of 570 women and 388 men, aged 55-92 years at baseline. Regression analyses, adjusted for standard osteoporosis covariates, showed an inverse U-shaped association of retinol, assessed by food-frequency questionnaires in 1988-1992, with baseline BMD, BMD measured 4 years later, and BMD change. Supplemental retinol use, reported by 50% of women and 39% of men, was an effect modifier in women; the associations of log retinol with BMD and BMD change were negative for supplement users and positive for nonusers at the hip, femoral neck, and spine. At the femoral neck, for every unit increase in log retinol intake, supplement users had 0.02 g/cm2 (p = 0.02) lower BMD and 0.23% (p = 0.05) greater annual bone loss, and nonusers had 0.02 g/cm2 (p = 0.04) greater BMD and 0.22% (p = 0.19) greater bone retention. However, among supplement users, retinol from dietary and supplement sources had similar associations with BMD, suggesting total intake is more important than source. In both sexes, increasing retinol became negatively associated with skeletal health at intakes not far beyond the recommended daily allowance (RDA), intakes reached predominately by supplement users. This study suggests there is a delicate balance between ensuring that the elderly consume sufficient vitamin A and simultaneously cautioning against excessive retinol supplementation.
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Affiliation(s)
- Joanne H E Promislow
- Department of Epidemiology, School of Public Health, University of North Carolina, Chapel Hill, USA
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32
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Yan T, Wergedal J, Zhou Y, Mohan S, Baylink DJ, Strong DD. Inhibition of human osteoblast marker gene expression by retinoids is mediated in part by insulin-like growth factor binding protein-6. Growth Horm IGF Res 2001; 11:368-377. [PMID: 11914024 DOI: 10.1054/ghir.2001.0249] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
All-trans -retinoic acid (atRA) inhibits osteoblast marker gene expression and markedly increases expression of insulin-like growth factor binding protein-6 (IGFBP-6) in human osteoblasts. The possibility that IGFBP-6 inhibits the osteoblast phenotype and also mediates the inhibitory effect of atRA on osteoblast marker gene expression was explored using an antisense approach. Stable human osteoblast-like osteosarcoma SaOS-2 cells were prepared that expressed antisense IGFBP-6 RNA under basal and atRA-stimulated conditions. The functional expression of IGFBP-6 antisense RNA was confirmed by measuring IGFBP-6 mRNA by Northern analysis or by measuring IGFBP-6 protein in the conditioned media (CM) by radioimmunoassay. Antisense clones produced less mRNA and had less IGFBP-6 protein in the CM than controls. IGFBP-6 protein levels in the CM were inversely correlated with alkaline phosphatase (ALP) activity, whereas IGFBP-3 and IGFBP-4 protein levels were not. We reasoned that atRA would have little or no effect on ALP activity in IGFBP-6 antisense clones if atRA mediated its inhibitory effects by recruiting IGFBP-6. In the majority of IGFBP-6 antisense clones with the lowest IGFBP-6 mRNA and CM protein levels and only modest changes in other IGF system components, atRA did not significantly decrease ALP activity. These findings provide evidence that atRA recruits IGFBP-6 to inhibit the human osteoblast phenotype.
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Affiliation(s)
- T Yan
- Musculoskeletal Disease Center (151), J.L. Pettis Memorial Veterans' Medical Center, 11201 Benton St., Loma Linda, CA 92357, USA
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Gu X, Shin BH, Akbarali Y, Weiss A, Boltax J, Oettgen P, Libermann TA. Tel-2 is a novel transcriptional repressor related to the Ets factor Tel/ETV-6. J Biol Chem 2001; 276:9421-36. [PMID: 11108721 DOI: 10.1074/jbc.m010070200] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
We report here the isolation of Tel-2, a novel member of the Ets transcription factor family, with high homology to Tel/ETV-6. Tel-2 is the second mammalian member of the Tel Ets family subclass whose prototype Tel is involved in various chromosomal translocations in human cancers. Six differentially expressed alternative splice products of Tel-2 were characterized encoding different Tel-2 isoforms which either contain or lack the amino-terminal Pointed domain and also vary at the carboxyl terminus. In contrast to Tel, which is highly expressed in several different cell types and tissues, Tel-2 is only weakly expressed in a variety of tissues and cell types, including placenta, prostate, spleen, liver, and lung. Tel-2 binds to functionally relevant Ets-binding sites of several genes and only the Tel-2 isoform containing the Pointed domain and the DNA-binding domain acts as a strong repressor of transcription. The retinoic acid receptor alpha and bone morphogenetic protein-6B (BMP-6) genes are specifically repressed by Tel-2 indicating a function for Tel-2 as an inhibitor of differentiation. Due to the important involvement of Tel in human cancer and the location of Tel-2 within the MHC cluster region, Tel-2 might be involved in chromosomal translocations in human cancer as well.
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Affiliation(s)
- X Gu
- New England Baptist Bone and Joint Institute, Beth Israel Deaconess Medical Center, and Harvard Medical School, Boston, Massachusetts 02115, USA
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Sago K, Teitelbaum SL, Venstrom K, Reichardt LF, Ross FP. The integrin alphavbeta5 is expressed on avian osteoclast precursors and regulated by retinoic acid. J Bone Miner Res 1999; 14:32-8. [PMID: 9893063 PMCID: PMC2710096 DOI: 10.1359/jbmr.1999.14.1.32] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Osteoclasts arise by proliferation, differentiation, and subsequent fusion of marrow-derived precursors, all processes requiring attachment to matrix. Integrins are important mediators of cell-matrix recognition and bone is rich in proteins containing the Arg-Gly-Asp motif, recognized primarily by alphav integrins. Thus, we determined if avian osteoclast precursors express integrins capable of mediating initial attachment to matrix proteins. Early, marrow-derived osteoclast precursors, when first isolated, contain no detectable alphavbeta3, but express an alphav integrin with an 80 kDa associated beta subunit. Immunoprecipitation with an antibody raised against the conserved beta5 cytoplasmic tail sequence indicates the the alphav associated the integrin is alphavbeta5. Retinoic acid is a resorptive steroid, and its exposure to early osteoclast precursors prompts a time- and dose-dependent decrease in alphavbeta5 expression, while simultaneously stimulating alphavbeta3 expression. Northern analysis reveals that retinoic acid decreases beta5 steady-state mRNA, nontranscriptionally, without altering that of alphav. The finding alphavbeta5 expression decreases under the influence of retinoic acid, an osteoclastogenic steroid, while those of alphavbeta3 rise, suggests that these closely related integrins play separate and complementary roles during osteoclast differentiation.
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Affiliation(s)
- K Sago
- Department of Pathology, Washington University School of Medicine, St. Louis, Missouri 63110, USA
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Cohen-Tanugi A, Forest N. Retinoic acid suppresses the osteogenic differentiation capacity of murine osteoblast-like 3/A/1D-1M cell cultures. Differentiation 1998; 63:115-23. [PMID: 9697305 DOI: 10.1046/j.1432-0436.1998.6330115.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Bone is a target tissue for action of retinoids though their precise role remains unclear. This study investigated the effects of retinoic acid (RA) on the marrow stromal 3/A/1D-1M osteoblast-like cells, derived from the in vivo transplantation of 3/A/1D-1 chondroprogenitor cells. Long-term treatment with 1 microM RA for 7 weeks induced a marked decrease in bone-like nodule number and ultrastructural alterations in the striation and the size of the collagen fibres. RA at concentrations varying from 10 nM to 3.16 microM had a dose-dependent inhibition effect on alkaline phosphatase (AP) activity with an IC50 of 0.7 microM. Treatment with 1 microM RA for up to 17 days induced a time-dependent inhibition of AP activity, while the beginning of RA treatment (4 or 52 h of culture) produced a differential magnitude of inhibition. These variations were unrelated to modifications of the expression of RAR receptor at the protein level, as assessed by Western blot analysis. Exposure to 1 microM RA for 6 or 24 h administered at day 14 produced an inhibition of AP activity, which reached a maximum after 48 h, with a recovery time of 8 days in both cases. Long-term treatment with RA at 1 microM completely abolished the level of osteocalcin mRNA on both days 12 and 16, as revealed by Northern blot analysis. However, such RA-treated cells retained the constitutive expression of type II procollagen transcripts. These results suggest that RA inhibits several aspects of osteogenic differentiation capacity, a loss of phenotype, which, in association with the maintenance of type II procollagen cartilage-related characteristic, could be a prerequisite step for cellular plasticity.
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Affiliation(s)
- A Cohen-Tanugi
- Laboratoire de Biologie-Odontologie, Université Paris, Institut Biomédical des Cordeliers, France
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Chiba M, Teitelbaum SL, Cao X, Ross FP. Retinoic acid stimulates expression of the functional osteoclast integrin αvβ3: Transcriptional activation of the β3 but not the αv gene. J Cell Biochem 1996. [DOI: 10.1002/(sici)1097-4644(19960915)62:4<467::aid-jcb4>3.0.co;2-k] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Chiba M, Teitelbaum SL, Cao X, Ross FP. Retinoic acid stimulates expression of the functional osteoclast integrin alpha v beta 3: transcriptional activation of the beta 3 but not the alpha v gene. J Cell Biochem 1996; 62:467-75. [PMID: 8891892 DOI: 10.1002/(sici)1097-4644(19960915)62:4%3c467::aid-jcb4%3e3.0.co;2-k] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The capacity of osteoclasts to resorb bone depends, in part, on the surface expression of the integrin alpha v beta 3. We have investigated whether the steroid hormone retinoic acid, known to stimulate bone resorption, regulates the appearance of the alpha v beta 3 complex in avian osteoclast presursors. Using surface labeling, followed by immunoprecipitation with a alpha v beta 3-specific antibody, we show that retinoic acid increases surface expression of the heterodimer in a dose- and time-dependent manner. Northern analysis reveals that the high basal steady-state levels of alpha v mRNA do not change, while those for beta 3 rise significantly from their initially low levels. Nuclear run-on studies confirm that steroid treatment stimulates transcription of the beta 3, but not the alpha v gene. Osteoclast precursors treated with retinoic acid exhibit increased multinucleation and expression of the osteoclast marker enzyme tartrate-resistant acid phosphatase. However, the fused cells do not have an increased capacity to resorb bone. In summary, multinucleated cells generated in this study do not represent fully differentiated bone-resorbing polykaryons. These results suggest that treatment of osteoclast precursors with retinoic acid is necessary, but insufficient, for expression of the mature osteoclast phenotype.
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Affiliation(s)
- M Chiba
- Department of Pathology, Jewish Hospital, Washington University Medical Center, St. Louis, Missouri 63110, USA
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Overall CM. Repression of tissue inhibitor of matrix metalloproteinase expression by all-trans-retinoic acid in rat bone cell populations: comparison with transforming growth factor-beta 1. J Cell Physiol 1995; 164:17-25. [PMID: 7790389 DOI: 10.1002/jcp.1041640104] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Retinoids and transforming growth factor-beta 1 (TGF-beta 1) reduce the transcriptional activation of matrix metalloproteinases (MMPs) and increase the expression of the specific tissue inhibitor of MMPs (TIMP-1) in fibroblasts. In contrast, all-trans-retinoic acid (retinoic acid) increases MMP expression in osteoblasts. Therefore, the mechanistic aspects of TIMP-1 regulation by retinoic acid in primary cultures of rat calvarial bone cell populations were studied and compared with those of TGF-beta 1 to determine if modulation of TIMP-1 would augment MMP expression. Retinoic acid was found to reduce TIMP-1 mRNA levels after 24 and 72 hr of culture by up to 60% in a dose-dependent manner. Maximal inhibition occurred at 10(-6) M retinoic acid with half maximal repression at approximately 5 x 10(-8) M. To determine the half life of TIMP-1 mRNA, the specific RNA polymerase II inhibitor DRB was added to cultures and the chase RNA analyzed by slot blots. TIMP-1 mRNA had a half life of approximately 14 hr and this was unaltered by retinoic acid treatment, suggesting that retinoic acid exerts its effects on TIMP-1 transcriptionally. When retinoic acid was added to cycloheximide-treated cultures TIMP-1 mRNA levels were reduced at 5 hr compared with controls. This showed that ongoing protein synthesis was not required to mediate the retinoic acid repression of TIMP-1 mRNA levels and supports the evidence that retinoic acid acts at the transcriptional level to reduce TIMP-1 expression. In contrast, TGF-beta 1 increased TIMP-1 mRNA levels by 3.5-fold at 24 hr to > 10-fold at 72 hr without alterations in mRNA stability indicating that transforming growth factor (TGF)-beta 1 also acts at the transcriptional level to upregulate TIMP-1 expression in bone cells. Thus, these studies have revealed that TIMP-1 regulation by retinoic acid is different in osteoblasts from other cells and that retinoic acid has the property of generating resorptive and formative cell phenotypes in a tissue-specific manner. In bone, reduced TIMP-1 expression would favor bone matrix degradation and bone resorption that is a characteristic action of retinoids.
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Affiliation(s)
- C M Overall
- Faculty of Dentistry, University of British Columbia, Vancouver, Canada
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Skinner M. Hypovitaminosis A: A model for sudden infant death syndrome. Am J Hum Biol 1995; 7:381-399. [PMID: 28557034 DOI: 10.1002/ajhb.1310070314] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/1994] [Accepted: 11/26/1994] [Indexed: 11/07/2022] Open
Abstract
The cause of sudden infant death syndrome (SIDS) is unknown. It is the leading cause of death from age one month to one year in North America. The purpose of this essay is to generate some testable hypotheses as to the cause of SIDS by drawing attention to distinct epidemiological parallels between SIDS and a newly recognized form of enamel hypoplasia, termed localized hypoplasia of the primary canine tooth (LHPC), which has been attributed to vitamin A deficiency. LHPC and SIDS share a common epidemiological profile: winter seasonality, occurrence at 3-5 months, and affecting apparently healthy children, but with increased incidence in socio economically disadvantaged families particularly racial/ethnic minorities (except Hispanics who show a reduced incidence), previously compromised infant health, less prenatal counselling, and less breastfeeding. Vitamin A has pervasive functions throughout the body including bone growth and maintenance of epithelial membranes. It is proposed that SIDS is due in part to hypovitaminosis A through one of several mechanisms: imbalanced basicranial growth producing mechanical constriction on the respiratory nerves passing through the jugular foramen; or through compromised myelination and/or maturation of the brain stem and cranial nerves involved in respiration; or through pharyngeal collapse due to mandibular undergrowth; or dysfunction of hypoxia-sensitive epithelial cells in the trachea. It is recommended that assay of hypoxia-sensitive epithelial cells in the trachea. It is recommended that assay of the retinyl ester content of the liver of SIDS victims be included in autopsy protocol. © 1995 Wiley-Liss, Inc.
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Affiliation(s)
- Mark Skinner
- Department of Archaeology, Simon Fraser University, Burnaby, B.C., V5A IS6, Canada
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Togari A, Arakawa S, Arai M, Matsumoto S. Alteration of in vitro bone metabolism and tooth formation by zinc. GENERAL PHARMACOLOGY 1993; 24:1133-40. [PMID: 8270172 DOI: 10.1016/0306-3623(93)90360-a] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
1. The effects of zinc on bone metabolism and tooth formation was examined in organ cultures of calvaria and tooth germ, and in cell cultures of osteoblast-like cells, MC3T3-E1. 2. Treatment of calvaria with zinc (10, 100 microM) for 4 days both increased alkaline phosphatase (ALP) activity in bone and reduced the secretion of N-acetyl beta-glucosaminidase from bone, without affecting bone mineral or collagen content. The increase in ALP activity produced by zinc (10 microM) was inhibited neither by actinomycin D (5 micrograms/ml) nor by cycloheximide (0.5 micrograms/ml). 3. Treatment of MC3T3-E1 cells with zinc (50, 100 microM) for 25 days also increased ALP activity, but reduced calcium content in cells and in the matrix layer. 4. These results indicate that zinc increases ALP activity in osteoblasts without affecting de novo enzyme synthesis, and that it inhibits bone mineralization, in accordance with the inhibition of osteoclastic activity. 5. Treatment of tooth germ with zinc (100 microM) for 7 days also produced an increase in ALP activity and inhibition of mineralization. These results indicate that the increased ALP activity produced by zinc is a common phenomenon in hard tissues, and, further, that zinc inhibits mineralization during tissue formation.
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Affiliation(s)
- A Togari
- Department of Pharmacology, School of Dentistry, Aichi-Gakuin University, Nagoya, Japan
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