Epidemic of Vitamin D Deficiency and Health Hazards. Wayne Meikle, MD Professor of Endocrinology and Pathology, U of U School of Medicine
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1 Epidemic of Vitamin D Deficiency and Health Hazards Wayne Meikle, MD Professor of Endocrinology and Pathology, U of U School of Medicine
2 Objectives List the main sources of vitamin D Describe the endocrine changes associated with vitamin D deficiency Know disease risks associated with vitamin D deficiency Know how to diagnose and treat vitamin D deficiency
3 Mechanisms of Calcium Regulation PTH 1,25 dihydroxy Vit. D Calcitonin Calcium sensor receptor Calcium effects
4 Biological pathway 4
5 Control of Serum Calcium
6 Calcium Regulation of PTH
7 Main causes of hypocalcemia 1) loss of calcium from the circulation 2) hypoparathyroidism including pseudohypoparathyroidism 3) Magnesium deficiency 4) vitamin D deficiency.
8 PTH-Calcium Nomogram
9 Treatment of Hypocalcemia Hypoparathyroidism, primary or secondary Oral calcium for mild cases plus vitamin D or calcitriol Intravenous calcium if the symptoms are severe Vitamin D deficiency Vitamin D plus supplemental calcium Magnesium deficiency magnesium
10 Vitamin D Deficiency Without Hypocalcemia Secondary Hyperparathyroidism Osteomalacia Osteoporosis
11 Armas et al JCEM 89: ,
12 25 OH Vitamin D and Vitamin D 3 Dose Heaney et al. Am J Clin Nutr 77:204-10, 2003; Note 40 IU=1ug D 3
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14 Minimal Erytheme Dose (MED) Amount of UVB that produces redness 24 hours after exposure Learn your MED to avoid Sunburns
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17 Variable Skin Characteristics Skin Type I (2%) Skin Type II (12%) Red/red-blond hair, freckles Always sunburned, no tanning of the skin 5-10 minutes to develop erythema Blond, fair/light colored eyes Often sunburned, weak tanning of the skin minutes to develop erythema Skin Type III (78%) Brunette, light or dark eye color Rarely sunburned, good skin pigmentation minutes to develop erythema Skin Type IV (8%) Dark hair, Mediterranean type Never sunburned, dark tan Approximately 45 minutes to develop erythema
18 Optimal and Normal Vitamin D-25OH Concentrations Optimal 25-hydroxyvitamin D values are: ng/ml Toxicity >100 ng/ml 25-hydroxyvitamin D lab values are: Insufficiency ng/ml Deficiency <20 ng/ml
19 Measurement Total Vitamin D 25 OH Vitamin D3 25 OH animal sources Vitamin D2 25 OH Plant sources Mass Spec can measure both forms and provide a total value RIA can measure total from both sources No known advantage to measure both forms
20 1,25 DihydroxyVitamin D or Calcitriol Circulating Mainly made in the kidney Stimulated by PTH and hypophosphatasemia Renal failure and PTH deficiency can cause a deficiency and hypocalcemia Used to diagnose hypercalcemia Monitor therapy of renal failure
21 Extrarenal Synthesis of Vitamin D 1,25 (OH) 2 D 3 Autonomous production 1,25 (OH) 2 D 3 Colon Prostate Mammary gland Many other tissues Lechner et al. Molecular and Cellular Endocrinology 263: 55-64, 2006
22 How is the optimal serum concentration of Vitamin D 25 OH Determined?
23 Relationship between PTH and Serum Vitamin 25(OH)D Thomas, NEJM, 338:777-83
24 Vitamin D Concentration and Calcium Absorption Postmenopausal women Increase vitamin D 25 OH from 20 ng/ml to 32 ng/ml increased intestinal calcium absorption 65%. This led to defining vitamin D insufficiency as a 25(OH)D concentration of ng/ml Heaney et al J Am Coll Nutr. 22:142-6, 2003
25 Vitamin D 25OH and Osteoid Priemel et al. JBMR 25: , 2010
26 How Frequent is Vitamin D Deficiency? About 58% of assays for Vitamin D 25 OH at ARUP in 2008 and 2009 were less than 30 ng/ml ng/ml=2.5 nmol/l
27 Vitamin D 25OH
28 Priemel et al. JBMR 25: , 2010
29 Ginde et al Arch Intern Med 169:626-32, 2009
30 Ginde et al Arch Intern Med 169:626-32, 2009
31 Ginde et al Arch Intern Med 169:626-32, 2009
32 Watching Television >4 hours daily 38% Vitamin D <15 ng/ml No TV 2% Vitamin D < 15 ng/ml
33 Vitamin D Transport Blood Vitamin D binding protein (DBP)-4-8 mm 85-88%, only about 2% saturated 25OH, Ka=5x108M 1,25(OH)2D, Ka=4x107M Albumin 12-15% Free Vitamin D 25OHD-0.03% 1,25(OH)2D-0.4%
34 Why has Vitamin D Deficiency Increased?
35 Sun Exposure UV triggers Vitamin D synthesis Influenced by Season Geographic latitude Time of day Cloud cover-reduces 50% Smog Sunscreen-SPF 8 or > blocks vitamin D Sunlight minutes adequate time for vitamin D synthesis
36 Hypovitaminosis D Causes of Vitamin D deficiency Dietay Sunscreen Limited sun exposure Malabsorption Decreased 25 hydroxylation in the liver Kidney can t convert Vitamin D 25 to 1, 25 dihydroxyvitamin D
37 Who needs supplemental Vitamin D Breast feed infants Older adults Persons with limited sun exposure Darker skin people Persons with fat malabsorption Anticonvulsants
38 Vitamin D Osteoporosis-silent contributor Cancer protection-colon, prostate Corticosteroids-decrease vitamin D absorption Caffeine-may decrease Vitamin D absorption
39 Food Sources of Vitamin D Milk fortified with Vitamin D, 400 IU/Qt One cup supplies 50% recommended for adults yrs 25% for yrs 15% for 71 and older Cheese and Ice cream are not fortified
40 Holick NEJM 357: , 2007
41 Sun Exposure Scale and Serum 25(OH)D Thomas, NEJM, 338:777-83
42 Tanning Bed Effects on 25(OH)D, Calcium and PTH 10 min. 3 times/week for 6 months Holick Curr. Opin.Endo Diab. 9:87-98, 2002
43 Serum 25(OH)D Seniors Boston in August Holick Curr. Opin.Endo Diab. 9:87-98, 2002
44 Effect of Sunscreen and Aging on Serum 25(OH)D Holick Curr. Opin.Endo Diab. 9:87-98, 2002
45 Serum 25(OH)D in Long-term Sunscreen Users Matsuoka, Arch Derm 124: , 1988
46 What are the health consequences of Vitamin D deficiency?
47 Vitamin D deficiency Studies in Mice Mimics Deficiency in Humans and Health Risks
48 Vitamin D Receptor (VDR) Null Mice VRD or vitamin D deficiency Immune system is grossly normal Increased sensitivity to autoimmune diseases, such as inflammatory bowel disease or type I diabetes after exposure to predisposing factors More prone to oncogene or chemocarcinogen-induced tumors
49 Vitamin D Receptor (VDR) Null Increased Mice High renin hypertension Cardiac hypertrophy Thrombogenicity Increased prevalence of diseases in humans
50 Vitamin D and the Endocrine System Fertility decreased in males and females Reduced sperm number and motility Increased LH and FSH Hypergonadotropic hypogonadism These are from studies in mice and human studies need to be done.
51 Health Consequences of Vitamin D Deficiency in humans
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54 Obesity and Vitamin D 25 OH Common Insufficiency Is the vitamin D insufficiency of obesity causally related to health hazards? Diabetes Cardiovascular disease Cancer Gonadal dysfunction
55 Kremer et al JCEM 93, 2008
56 Kremer et al JCEM 93, 2008
57 Vitamin D Concentrations and Cancer Risk Inverse association between vitamin D 25 OH and colorectal cancers Mixed results with association of Vitamin D 25 OH and prostate and breast cancer
58 Vitamin D and the Immune System Vitamin D deficiency associated with Increased susceptibility to infections Autoimmune disease such as type I diabetes
59 Vitamin D and the Endocrine System Vitamin D deficiency Impairs Insulin secretion Glucose tolerance Increases risk of metabolic syndrome Increases cardiovascular risk Decreased muscle mass, strength and predisposition to falls in the elderly
60 Vitamin D and Type 2 Diabetes Vitamin D 25OH score and T2D Framingham Study-133 T2D cases over 7 years Highest quartile vitamin D score compared to lowest quartile at baseline had 40% lower incidence of T2D Adjusted for age, sex, waist circumference, prenatal history of T2D, hypertension, low HDL, cholesterol, elevated triglycerides, impaired fasting glucose, and dietary guidelines Lin et al, Am J Clin Nutr, 2010
61 Vitamin D-Calcium Effect on Bone Remodeling Markers Grados, JCEM 88: , 2003
62 Bischoff-Ferrari JAMA 293:2257, 2005
63 Myocardial Infarction Risk and Vitamin D 25 OH Giovannucci E et al Arch Intern Med 168: , 2008
64 Hazard Ratio (95% Cl) Cardiovascular Mortality Dobmig H et al Arch Intern Med 168: , 2008
65 Potential Mechanisms of Vitamin D Health Protection
66 Effect of Vitamin D, 1, 25 (OH)2 on Foam Cells in Diabetic Oh et al Circulation 120: , 2009
67 Effect of Vitamin D, 1, 25 (OH)2 on Foam Cells in Diabetic Oh et al Circulation 120: , 2009
68 Vitamin D and diabetic cardiovascular disease Deletion of vitamin D receptors in macrophages from diabetics accelerated foam cell formation induced by modified LDL. Vitamin D receptor signaling is a potential mechanism underlying increased foam cell formation and accelerated cardiovascular disease in diabetic subjects.
69 Ginde et al Arch Intern Med , 2009
70 Chun et al JCEM 95: , 2010
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72 Insulin Sensitivity and Vitamin D 25OH in PCOS Ashraf et al JCEM (4: , 2009
73 Vitamin D and Endothelial Function Tarcin JCEM 94: , 2009
74 Tarcin JCEM 94: , 2009 Vitamin D and Flow Mediated Dilatation
75 Cancer and Vitamin D Randomized control trial in postmenopausal women 1100 IU vitamin D 3 plus 1500 mg of calcium daily for 4 years Vitamin D group vitamin D 25OH increased 24 nmol/l No change in calcium only or placebo >60% reduction in all cancers Lappe et al. Am J Clin Nutr 85: , 2007
76 Vitamin D and Calcium on Cancer Free Lappe et al. Am J Clin Nutr 85: , 2007
77 Expression of CYP27B1 Increased in hyperplastic colon polyps Increased in early stage tumors Declines in late-stage neoplasia CYP24A1 is induced by 1,25 (OH) 2 D 3 Tumor cells determine the extent of Vitamin D catabolism Lechner et al. Molecular and Cellular Endocrinology 263: 55-64, 2006
78 Antiproliferative Effects of Vitamin D 25 OH in Colon Cancer Lechner et al. Molecular and Cellular Endocrinology 263: 55-64, 2006
79 Renal and Colon Vitamin D Synthesis and Catabolism Cross and Kallay Futrue Oncol 5: , 2009
80 CYP24A1 and CYP27B1 in Normal Colon and Colon Tumor Lechner et al. Molecular and Cellular Endocrinology 263: 55-64, 2006
81 Summary of Vitamin 25 (OH)D Deficiency Common, particularly in older women Generally asymptomatic Causes decreased dietary intake decreased sun exposure Sunscreen Diagnosis:Serum 25(OH)D <20 ng/ml and Elevated PTH; insufficiency <30 ng/ml Benefits-CVD, diabetes, cancer, immune Treatment: Vitamin D
82 Questions
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