Osteoporosis groups hide their synthetic vitamin D recommendations behind 40 dollar paywall
Luisella Cianferotti, Claudio Cricelli, John A. Kanis, Ranuccio Nuti, Jean-Y. Reginster, Johann D. Ringe, Rene Rizzoli, Maria Luisa Brandi
Abstract
Several compounds are produced along the complex pathways of vitamin D3 metabolism, and synthetic analogs have been generated to improve kinetics and/or vitamin D receptor activation. These metabolites display different chemical properties with respect to the parental or native vitamin D3, i.e., cholecalciferol, which has been, so far, the supplement most employed in the treatment of vitamin D inadequacy. Hydrophilic properties of vitamin D3 derivatives facilitate their intestinal absorption and their manageability in the case of intoxication because of the shorter half-life. Calcidiol is a more hydrophilic compound than parental vitamin D3. Active vitamin D analogs, capable of binding the vitamin D receptor evoking vitamin D-related biological effects, are mandatorily employed in hypoparathyroidism and kidney failure with impaired 1α-hydroxylation. They have been shown to increase BMD, supposedly ameliorating calcium absorption and/or directly affecting bone cells, although their use in these conditions is jeopardized by the development of hypercalciuria and mild hypercalcemia. Further studies are needed to assess their overall safety and effectiveness in the long-term and new intermittent regimens, especially when combined with the most effective antifracture agents.
But, references are free (none from 2015)
Jones, G, Prosser, DE, Kaufmann, M ( 2014 ) Cytochrome P450-mediated metabolism of vitamin D. J. Lipid Res. 55: pp. 13
Imawari, M, Akanuma, Y, Itakura, H, Muto, Y, Kosaka, K, Goodman, DS (1979) The effects of diseases of the liver on serum 25-hydroxyvitamin D and on the serum binding protein for vitamin D and its metabolites. J. Lab. Clin. Med. 93: pp. 171
Zerwekh, JE (2008) Blood biomarkers of vitamin D status. Am. J. Clin. Nutr. 87: pp. 1087S-1091S
Cianferotti, L, Marcocci, C (2012) Subclinical vitamin D deficiency. Best Pract. Res. Clin. Endocrinol. Metab. 26: pp. 523
Binkley, N, Wiebe, D ( 2013 ) Clinical controversies in vitamin D: 25(OH)D measurement, target concentration, and supplementation. J. Clin. Densitom. 16: pp. 402
Abboud, M, Puglisi, DA, Davies, BN, Rybchyn, M, Whitehead, NP, Brock, KE, Cole, L, Gordon-Thomson, C, Fraser, DR, Mason, RS ( 2013 ) Evidence for a specific uptake and retention mechanism for 25-hydroxyvitamin D (25OHD) in skeletal muscle cells. Endocrinology 154: pp. 3022
Molnár, F, Sigüeiro, R, Sato, Y, Araujo, C, Schuster, I, Antony, P, Peluso, J, Muller, C, Mouriño, A, Moras, D, Rochel, N (2011) 1α,25(OH)2-3-epi-vitamin D3, a natural physiological metabolite of vitamin D3: its synthesis, biological activity and crystal structure with its receptor. Plos One 6: pp. e18124
Holick, MF (2007) Vitamin D deficiency. N. Engl. J. Med. 357: pp. 266
Girgis, CM, Clifton-Bligh, RJ, Hamrick, MW, Holick, MF, Gunton, JE ( 2013 ) The roles of vitamin D in skeletal muscle: form, function, and metabolism. Endocr. Rev. 34: pp. 33
Gerdhem, P, Ringsberg, KA, Obrant, KJ, Akesson, K (2005) Association between 25-hydroxy vitamin D levels, physical activity, muscle strength and fractures in the prospective population-based OPRA Study of Elderly Women. Osteoporos. Int. 16: pp. 1425
Lai, JK, Lucas, RM, Clements, MS, Roddam, AW, Banks, E (2010) Hip fracture risk in relation to vitamin D supplementation and serum 25-hydroxyvitamin D levels: a systematic review and meta-analysis of randomised controlled trials and observational studies. BMC Public Health. 10: pp. 331
Pludowski, P, Holick, MF, Pilz, S, Wagner, CL, Hollis, BW, Grant, WB, Shoenfeld, Y, Lerchbaum, E, Llewellyn, DJ, Kienreich, K, Soni, M ( 2013 ) Vitamin D effects on musculoskeletal health, immunity, autoimmunity, cardiovascular disease, cancer, fertility, pregnancy, dementia and mortality-a review of recent evidence. Autoimmun. Rev. 12: pp. 976
Bischoff-Ferrari, HA, Giovannucci, E, Willett, WC, Dietrich, T, Dawson-Hughes, B (2006) Estimation of optimal serum concentrations of 25-hydroxyvitamin D for multiple health outcomes. Am. J. Clin. Nutr. 84: pp. 18
Wacker, M, Holick, MF ( 2013 ) Vitamin D—effects on skeletal and extraskeletal health and the need for supplementation. Nutrients. 5: pp. 111
Hollis, BW, Wagner, CL ( 2013 ) Clinical review: the role of the parent compound vitamin D with respect to metabolism and function: Why clinical dose intervals can affect clinical outcomes. J. Clin. Endocrinol. Metab. 98: pp. 4619
Chun, RF, Peercy, BE, Orwoll, ES, Nielson, CM, Adams, JS, Hewison, M ( 2014 ) Vitamin D and DBP: the free hormone hypothesis revisited. J Steroid Biochem Mol Biol. 144: pp. 132
Gallagher, JC, Sai, A, Templin, T, Smith, L (2012) Dose response to vitamin D supplementation in postmenopausal women: a randomized trial. Ann. Intern. Med. 156: pp. 425
Dawson-Hughes, B, Mithal, A, Bonjour, JP, Boonen, S, Burckhardt, P, Fuleihan, GE, Josse, RG, Lips, P, Morales-Torres, J, Yoshimura, N (2010) IOF position statement: vitamin D recommendations for older adults. Osteoporos. Int. 21: pp. 1151
Holick, MF, Binkley, NC, Bischoff-Ferrari, HA, Gordon, CM, Hanley, DA, Heaney, RP, Murad, MH, Weaver, CM (2012) Guidelines for preventing and treating vitamin D deficiency and insufficiency revisited. J. Clin. Endocrinol. Metab. 97: pp. 1153
Rizzoli, R, Boonen, S, Brandi, ML, Bruyère, O, Cooper, C, Kanis, JA, Kaufman, JM, Ringe, JD, Weryha, G, Reginster, JY ( 2013 ) Vitamin D supplementation in elderly or postmenopausal women: a 2013 update of the 2008 recommendations from the European Society for Clinical and Economic Aspects of Osteoporosis and Osteoarthritis (ESCEO). Curr. Med. Res. Opin. 29: pp. 305
Bischoff-Ferrari, HA, Willett, WC, Orav, EJ, Lips, P, Meunier, PJ, Lyons, RA, Flicker, L, Wark, J, Jackson, RD, Cauley, JA, Meyer, HE, Pfeifer, M, Sanders, KM, Stähelin, HB, Theiler, R, Dawson-Hughes, B (2012) A pooled analysis of vitamin D dose requirements for fracture prevention. N. Engl. J. Med. 367: pp. 40
Sanders, KM, Stuart, AL, Williamson, EJ, Simpson, JA, Kotowicz, MA, Young, D, Nicholson, GC (2010) Annual high-dose oral vitamin D and falls and fractures in older women: a randomized controlled trial. JAMA 303: pp. 1815
Rossini, M, Adami, S, Viapiana, O, Fracassi, E, Idolazzi, L, Povino, MR, Gatti, D (2012) Dose-dependent short-term effects of single high doses of oral vitamin D(3) on bone turnover markers. Calcif. Tissue Int. 91: pp. 365
Haussler, MR, Jurutka, PW, Mizwicki, M, Norman, AW (2011) Vitamin D receptor (VDR)-mediated actions of 1α,25(OH)2vitamin D3: genomic and non-genomic mechanisms. Best Pract. Res. Clin. Endocrinol. Metab. 25: pp. 543
Deluca, HF ( 2014 ) History of the discovery of vitamin D and its active metabolites. Bonekey Rep. 3: pp. 479
Lund, J, DeLuca, HF (1966) Biologically active metabolite of vitamin D3 from bone, liver, and blood serum. J. Lipid Res. 7: pp. 739
Avioli, LV, Lee, SW, McDonald, JE, Lund, J, DeLuca, HF (1967) Metabolism of vitamin D3-3H in human subjects: distribution in blood, bile, feces, and urine. J. Clin. Invest. 46: pp. 983
Blunt, JW, DeLuca, HF, Schnoes, HK (1968) 25-hydroxycholecalciferol. A biologically active metabolite of vitamin D3. Biochemistry 7: pp. 3317
Blunt, JW, Tanaka, Y, DeLuca, HF (1968) Biological activity of 25-hydroxycholecalciferol, a metabolite of vitamin D3. Proc. Natl. Acad. Sci. USA 61: pp. 1503
Blunt, JW, DeLuca, HF (1969) The synthesis of 25-hydroxycholecalciferol. A biologically active metabolite of vitamin D3. Biochemistry 8: pp. 671
Ponchon, G, Kennan, AL, DeLuca, HF (1969) “Activation” of vitamin D by the liver. J. Clin. Invest. 48: pp. 2032
Fraser, DR, Kodicek, E (1970) Unique biosynthesis by kidney of a biological active vitamin D metabolite. Nature 228: pp. 764
Lawson, DE, Fraser, DR, Kodicek, E, Morris, HR, Williams, DH (1971) Identification of 1,25-dihydroxycholecalciferol, a new kidney hormone controlling calcium metabolism. Nature 230: pp. 228
Boyle, IT, Miravet, L, Gray, RW, Holick, MF, Deluca, HF (1972) The response of intestinal calcium transport to 25-hydroxy and 1,25-dihydroxy vitamin D in nephrectomized rats. Endocrinology 90: pp. 605
Holick, MF, Garabedian, M, DeLuca, HF (1972) 1,25-dihydroxycholecalciferol: metabolite of vitamin D3 active on bone in anephric rats. Science 176: pp. 1146
Haddad, JG, Chyu, KJ (1971) Competitive protein-binding radioassay for 25-hydroxycholecalciferol. J. Clin. Endocrinol. Metab. 33: pp. 992
Belsey, R, Deluca, HF, Potts, JT (1971) Competitive binding assay for vitamin D and 25-OH vitamin D. J. Clin. Endocrinol. Metab. 33: pp. 554
Holick, MF, Schnoes, HK, DeLuca, HF (1971) Identification of 1,25-dihydroxycholecalciferol, a form of vitamin D3 metabolically active in the intestine. Proc. Natl. Acad. Sci. USA 68: pp. 803
Norman, AW, Myrtle, JF, Midgett, RJ, Nowicki, HG, Williams, V, Popják, G (1971) 1,25-dihydroxycholecalciferol: identification of the proposed active form of vitamin D3 in the intestine. Science 173: pp. 51
Tanaka, Y, DeLuca, HF, Omdahl, J, Holick, MF (1971) Mechanism of action of 1,25-dihydroxycholecalciferol on intestinal calcium transport. Proc. Natl. Acad. Sci USA 68: pp. 1286
Frolik, CA, Deluca, HF (1971) 1,25-dihydroxycholecalciferol: the metabolite of vitamin D responsible for increased intestinal calcium transport. Arch. Biochem. Biophys. 147: pp. 143
Garabedian, M, Holick, MF, Deluca, HF, Boyle, IT (1972) Control of 25-hydroxycholecalciferol metabolism by parathyroid glands. Proc. Natl. Acad. Sci. USA 69: pp. 1673
Mawer, EB, Taylor, CM, Backhouse, J, Lumb, GA, Stanbury, SW (1973) Failure of formation of 1,25-dihydroxycholecalciferol in chronic renal insufficiency. Lancet 1: pp. 626
Chertow, BS, Baylink, DJ, Wergedal, JE, Su, MH, Norman, AW (1975) Decrease in serum immunoreactive parathyroid hormone in rats and in parathyroid hormone secretion in vitro by 1,25-dihydroxycholecalciferol. J. Clin. Invest. 56: pp. 668
Frolik, CA, DeLuca, HF (1973) The stimulation of 1,25-dihydroxycholecalciferol metabolism in vitamin D-deficient rats by 1,25-dihydroxycholecalciferol treatment. J. Clin. Invest. 52: pp. 543
Tanaka, Y, Deluca, HF (1971) Bone mineral mobilization activity of 1,25-dihydroxycholecalciferol, a metabolite of vitamin D. Arch. Biochem. Biophys. 146: pp. 574
Raisz, LG, Trummel, CL, Holick, MF, DeLuca, HF (1972) 1,25-dihydroxycholecalciferol: a potent stimulator of bone resorption in tissue culture. Science 175: pp. 768
Garabedian, M, Tanaka, Y, Holick, MF, Deluca, HF (1974) Response of intestinal calcium transport and bone calcium mobilization to 1,25-dihydroxyvitamin D3 in thyroparathyroidectomized rats. Endocrinology 94: pp. 1022
Gray, RW, Caldas, AE, Wilz, DR, Lemann, J, Smith, GA, DeLuca, HF (1978) Metabolism and excretion of 3H-1,25-(OH)2-vitamin D3 in healthy adults. J. Clin. Endocrinol. Metab. 46: pp. 756
Clemens, TL, Hendy, GN, Graham, RF, Baggiolini, EG, Uskokovic, MR, O’Riordan, JL (1978) A radioimmunoassay for 1,25-dihydroxycholecalciferol. Clin. Sci. Mol. Med. 54: pp. 329
Diagnosis, prophylaxis and treatment of osteoporosis. Am. J. Med. 94: pp. 646
Holick, MF, Semmler, EJ, Schnoes, HK, DeLuca, HF (1973) 1 -Hydroxy derivative of vitamin D 3: a highly potent analog of 1,25-dihydroxyvitamin D 3. Science 180: pp. 190
Ueno, K, Okamiya, Y, Makita, T, Kurozumi, S, Kawashima, H, Hashimoto, Y (1979) Studies on biopharmacological activity of active vitamin D3 analogues (VII) Effect of 1 alpha-hydroxycholecalciferol on renal function in rats and Beagle dogs (Japanese). Nihon. Yakurigaku Zasshi. 75: pp. 617
Morimoto, S, Imanaka, S, Koh, E, Shiraishi, T, Nabata, T, Kitano, S, Miyashita, Y, Nishii, Y, Ogihara, T (1989) Comparison of the inhibitions of proliferation of normal and psoriatic fibroblasts by 1 alpha,25-dihydroxyvitamin D3 and synthetic analogues of vitamin D3 with an oxygen atom in their side chain. Biochem. Int. 19: pp. 1143
Tsurukami, H, Nakamura, T, Suzuki, K, Sato, K, Higuchi, Y, Nishii, Y (1994) A novel synthetic vitamin D analogue, 2 beta-(3-hydroxypropoxy)1 alpha, 25-dihydroxyvitamin D3 (ED-71), increases bone mass by stimulating the bone formation in normal and ovariectomized rats. Calcif. Tissue Int. 54: pp. 142
Tanaka, Y, Nakamura, T, Nishida, S, Suzuki, K, Takeda, S, Sato, K, Nishii, Y (1996) Effects of a synthetic vitamin D analog, ED-71, on bone dynamics and strength in cancellous and cortical bone in prednisolone-treated rats. J. Bone Miner. Res. 11: pp. 325
Uchiyama, Y, Higuchi, Y, Takeda, S, Masaki, T, Shira-Ishi, A, Sato, K, Kubodera, N, Ikeda, K, Ogata, E (2002) ED-71, a vitamin D analog, is a more potent inhibitor of bone resorption than alfacalcidol in an estrogen-deficient rat model of osteoporosis. Bone 30: pp. 582
Freitas, PH, Hasegawa, T, Takeda, S, Sasaki, M, Tabata, C, Oda, K, Li, M, Saito, H, Amizuka, N (2011) Eldecalcitol, a second-generation vitamin D analog, drives bone minimodeling and reduces osteoclastic number in trabecular bone of ovariectomized rats. Bone 49: pp. 335
Harada, S, Mizoguchi, T, Kobayashi, Y, Nakamichi, Y, Takeda, S, Sakai, S, Takahashi, F, Saito, H, Yasuda, H, Udagawa, N, Suda, T, Takahashi, N (2012) Daily administration of eldecalcitol (ED-71), an active vitamin D analog, increases bone mineral density by suppressing RANKL expression in mouse trabecular bone. J. Bone Miner. Res. 27: pp. 461
Lau, KH, Baylink, DJ (1999) Vitamin D therapy of osteoporosis: plain vitamin D therapy versus active vitamin D analog (D-hormone) therapy. Calcif. Tissue Int. 65: pp. 295
O’Donnell, S, Moher, D, Thomas, K, Hanley, DA, Cranney, A (2008) Systematic review of the benefits and harms of calcitriol and alfacalcidol for fractures and falls. J. Bone Miner. Metab. 26: pp. 531
Brandi, ML, Minisola, S ( 2013 ) Calcidiol [25(OH)D3]: from diagnostic marker to therapeutical agent. Curr. Med. Res. Opin. 29: pp. 1565
Peppone, LJ, Hebl, S, Purnell, JQ, Reid, ME, Rosier, RN, Mustian, KM, Palesh, OG, Huston, AJ, Ling, MN, Morrow, GR (2010) The efficacy of calcitriol therapy in the management of bone loss and fractures: a qualitative review. Osteoporos. Int. 21: pp. 1133
Eisman, JA, Bouillon, R ( 2014 ) Vitamin D: direct effects of vitamin D metabolites on bone: lessons from genetically modified mice. Bonekey Rep. 3: pp. 499
Ovesen, L, Brot, C, Jakobsen, J (2003) Food contents and biological activity of 25-hydroxyvitamin D: a vitamin D metabolite to be reckoned with?. Ann. Nutr. Metab. 47: pp. 107
Smith, JE, Goodman, DS (1971) The turnover and transport of vitamin D and of a polar metabolite with the properties of 25-hydroxycholecalciferol in human plasma. J. Clin. Invest. 50: pp. 2159
Stamp, TC, Round, JM, Haddad, JG (1973) Effect of oral vitamin D, 25-hydroxycholecalciferol (25-HCC) and whole-body ultra-violet irradiation on plasma 25-HCC levels in man. Clin. Sci. 44: pp. 3P
Stamp, TC (1974) Intestinal absorption of 25-hydroxycholecalciferol. Lancet 2: pp. 121
Haddad, JG, Stamp, TC (1974) Circulating 25-hydroxyvitamin D in man. Am. J. Med. 57: pp. 57
Haddad, JG, Rojanasathit, S (1976) Acute administration of 25-hydroxycholecalciferol in man. J. Clin. Endocrinol. Metab. 42: pp. 284
Jones, KS, Schoenmakers, I, Bluck, LJ, Ding, S, Prentice, A (2012) Plasma appearance and disappearance of an oral dose of 25-hydroxyvitamin D2 in healthy adults. Br. J. Nutr. 107: pp. 1128
Stamp, TC, Haddad, JG, Twigg, CA (1977) Comparison of oral 25-hydroxycholecalciferol, vitamin D, and ultraviolet light as determinants of circulating 25-hydroxyvitamin D. Lancet 1: pp. 1341
Hollis, BW, Conrad, HR, Hibbs, JW (1977) Changes in plasma 25-hydroxycholecalciferol and selected blood parameters after injection of massive doses of cholecalciferol or 25-hydroxycholecalciferol in non-lactating dairy cows. J. Nutr. 107: pp. 606
Barger-Lux, MJ, Heaney, RP, Dowell, S, Chen, TC, Holick, MF (1998) Vitamin D and its major metabolites: serum levels after graded oral dosing in healthy men. Osteoporos. Int. 8: pp. 222
Jetter, A, Egli, A, Dawson-Hughes, B, Staehelin, HB, Stoecklin, E, Goessl, R, Henschkowski, J, Bischoff-Ferrari, HA ( 2014 ) Pharmacokinetics of oral vitamin D(3) and calcifediol. Bone 59: pp. 14
Cashman, KD, Seamans, KM, Lucey, AJ, Stöcklin, E, Weber, P, Kiely, M, Hill, TR (2012) Relative effectiveness of oral 25-hydroxyvitamin D3 and vitamin D3 in raising wintertime serum 25-hydroxyvitamin D in older adults. Am. J. Clin. Nutr. 95: pp. 1350
Chou, SH, Chung, TK, Yu, B (2009) Effects of supplemental 25-hydroxycholecalciferol on growth performance, small intestinal morphology, and immune response of broiler chickens. Poult. Sci. 88: pp. 2333
Lauridsen, C, Halekoh, U, Larsen, T, Jensen, SK (2010) Reproductive performance and bone status markers of gilts and lactating sows supplemented with two different forms of vitamin D. J. Anim. Sci. 88: pp. 202
Sahin, N, Balci, TA, Kucuk, O, Smith, MO, Sahin, K (2009) Effects of 25-hydroxycholecalciferol and soy isoflavones supplementation on bone mineralisation of quail. Br. Poult. Sci. 50: pp. 709
Hines, EA, Coffey, JD, Starkey, CW, Chung, TK, Starkey, JD ( 2013 ) Improvement of maternal vitamin D status with 25-hydroxycholecalciferol positively impacts porcine fetal skeletal muscle development and myoblast activity. J. Anim. Sci. 91: pp. 4116
Hahn, TJ, Halstead, LR, Teitelbaum, SL, Hahn, BH (1979) Altered mineral metabolism in glucocorticoid-induced osteopenia. Effect of 25-hydroxyvitamin D administration. J. Clin. Invest. 64: pp. 655
Francis, RM, Peacock, M, Storer, JH, Davies, AE, Brown, WB, Nordin, BE (1983) Calcium malabsorption in the elderly: the effect of treatment with oral 25-hydroxyvitamin D3. Eur. J. Clin. Invest. 13: pp. 391
Russo, S, Carlucci, L, Cipriani, C, Ragno, A, Piemonte, S, Fiacco, RD, Pepe, J, Fassino, V, Arima, S, Romagnoli, E, Minisola, S (2011) Metabolic changes following 500 μg monthly administration of calcidiol: a study in normal females. Calcif. Tissue Int. 89: pp. 252
Peacock, M, Liu, G, Carey, M, McClintock, R, Ambrosius, W, Hui, S, Johnston, CC (2000) Effect of calcium or 25OH vitamin D3 dietary supplementation on bone loss at the hip in men and women over the age of 60. J. Clin. Endocrinol. Metab. 85: pp. 3011
Sosa, M, Láinez, P, Arbelo, A, Navarro, MC (2000) The effect of 25-dihydroxyvitamin D on the bone mineral metabolism of elderly women with hip fracture. Rheumatology (Oxford) 39: pp. 1263
Bischoff-Ferrari, HA, Dawson-Hughes, B, Stöcklin, E, Sidelnikov, E, Willett, WC, Edel, JO, Stähelin, HB, Wolfram, S, Jetter, A, Schwager, J, Henschkowski, J, Eckardstein, A, Egli, A (2012) Oral supplementation with 25(OH)D3 versus vitamin D3: effects on 25(OH)D levels, lower extremity function, blood pressure, and markers of innate immunity. J. Bone Miner. Res. 27: pp. 160
Bianchi, ML, Colombo, C, Assael, BM, Dubini, A, Lombardo, M, Quattrucci, S, Bella, S, Collura, M, Messore, B, Raia, V, Poli, F, Bini, R, Albanese, CV, Rose, V, Costantini, D, Romano, G, Pustorino, E, Magazzù, G, Bertasi, S, Lucidi, V, Traverso, G, Coruzzo, A, Grzejdziak, AD ( 2013 ) Treatment of low bone density in young people with cystic fibrosis: a multicentre, prospective, open-label observational study of calcium and calcifediol followed by a randomised placebo-controlled trial of alendronate. Lancet Respir. Med. 1: pp. 377
Drincic, A, Fuller, E, Heaney, RP, Armas, LA ( 2013 ) 25-Hydroxyvitamin D response to graded vitamin D3 supplementation among obese adults. J. Clin. Endocrinol. Metab. 98: pp. 4845
Petta, S, Cammà, C, Scazzone, C, Tripodo, C, Marco, V, Bono, A, Cabibi, D, Licata, G, Porcasi, R, Marchesini, G, Craxí, A (2010) Low vitamin D serum level is related to severe fibrosis and low responsiveness to interferon-based therapy in genotype 1 chronic hepatitis C. Hepatology 51: pp. 1158
Avioli, LV, Birge, SJ, Lee, SW (1968) Effects of prednisone on vitamin D metabolism in man. J. Clin. Endocrinol. Metab. 28: pp. 1341
Carré, M, Ayigbedé, O, Miravet, L, Rasmussen, H (1974) The effect of Prednisolone upon the metabolism and action of 25-hydroxy-and 1,25-dihydroxyvitamin D3. Proc. Natl. Acad. Sci. USA 71: pp. 2996
Hamed, SA (2011) Influences of bone and mineral metabolism in epilepsy. Expert Opin. Drug Saf. 10: pp. 265
Mutair, Al (2012) A.N., Nasrat, G.H., Russell, D.W.: mutation of the CYP2R1 vitamin D 25-hydroxylase in a Saudi Arabian family with severe vitamin D deficiency. J. Clin. Endocrinol. Metab. 97: pp. E2022
Garcia-Delgado, I, Prieto, S, Gil-Fraguas, L, Robles, E, Rufilanchas, JJ, Hawkins, F (1997) Calcitonin, etidronate, and calcidiol treatment in bone loss after cardiac transplantation. Calcif. Tissue Int. 60: pp. 155
Talalaj, M, Gradowska, L, Marcinowska-Suchowierska, E, Durlik, M, Gaciong, Z, Lao, M (1996) Efficiency of preventive treatment of glucocorticoid-induced osteoporosis with 25-hydroxyvitamin D3 and calcium in kidney transplant patients. Transplant. Proc. 28: pp. 3485
Compston, JE, Creamer, B (1977) Plasma levels and intestinal absorption of 25-hydroxyvitamin D in patients with small bowel resection. Gut 18: pp. 171
Batchelor, AJ, Watson, G, Compston, JE (1982) Changes in plasma half-life and clearance of 3H-25-hydroxyvitamin D3 in patients with intestinal malabsorption. Gut 23: pp. 1068
Davies, M, Mawer, EB, Krawitt, EL (1980) Comparative absorption of vitamin D3 and 25-hydroxyvitamin D3 in intestinal disease. Gut 21: pp. 287
Michaud, J, Naud, J, Ouimet, D, Demers, C, Petit, JL, Leblond, FA, Bonnardeaux, A, Gascon-Barré, M, Pichette, V (2010) Reduced hepatic synthesis of calcidiol in uremia. J. Am. Soc. Nephrol. 21: pp. 1488
Jean, G, Terrat, JC, Vanel, T, Hurot, JM, Lorriaux, C, Mayor, B, Chazot, C (2008) Daily oral 25-hydroxycholecalciferol supplementation for vitamin D deficiency in haemodialysis patients: effects on mineral metabolism and bone markers. Nephrol. Dial. Transplant. 23: pp. 3670
Schmidt-Gayk, H, Grawunder, C, Tschöpe, W, Schmitt, W, Ritz, E, Pietsch, V, Andrassay, K, Bouillon, R (1977) 25-hydroxy-vitamin-D in nephrotic syndrome. Lancet 2: pp. 105
Boer, IH, Sachs, MC, Cleary, PA, Hoofnagle, AN, Lachin, JM, Molitch, ME, Steffes, MW, Sun, W, Zinman, B, Brunzell, JD (2012) Diabetes Control and Complication Trial/Epidemiology of Diabetes Interventions and Complications Study Research Group. Circulating vitamin D metabolites and kidney disease in type 1 diabetes. J. Clin. Endocrinol. Metab. 97: pp. 4780
Foresta, C, Strapazzon, G, Toni, L, Perilli, L, Mambro, A, Muciaccia, B, Sartori, L, Selice, R (2011) Bone mineral density and testicular failure: evidence for a role of vitamin D 25-hydroxylase in human testis. J. Clin. Endocrinol. Metab. 96: pp. E646
Caniggia, A, Nuti, R, Lore, F, Martini, G, Turchetti, V, Righi, G (1990) Long-term treatment with calcitriol in postmenopausal osteoporosis. Metabolism. 39: pp. 43
Caniggia, A, Nuti, R, Loré, F, Martini, G, Frediani, B, Giovani, S (1993) Total body absorptiometry in postmenopausal osteoporosis patients treated with 1 alpha-hydroxylated vitamin D metabolites. Osteoporos. Int. 3: pp. 181
Tilyard, MW, Spears, GF, Thomson, J, Dovey, S (1992) Treatment of postmenopausal osteoporosis with calcitriol or calcium. N. Engl. J. Med. 326: pp. 357
Sambrook, P, Henderson, NK, Keogh, A, MacDonald, P, Glanville, A, Spratt, P, Bergin, P, Ebeling, P, Eisman, J (2000) Effect of calcitriol on bone loss after cardiac or lung transplantation. J. Bone Miner. Res. 15: pp. 1818
Gallagher, JC, Fowler, SE, Detter, JR, Sherman, SS (2001) Combination treatment with estrogen and calcitriol in the prevention of age-related bone loss. J. Clin. Endocrinol. Metab. 86: pp. 3618
Gallagher, JC, Rapuri, PB, Smith, LM (2007) An age-related decrease in creatinine clearance is associated with an increase in number of falls in untreated women but not in women receiving calcitriol treatment. J. Clin. Endocrinol. Metab. 92: pp. 51
Rhee, Y, Kang, M, Min, Y, Byun, D, Chung, Y, Ahn, C, Baek, K, Mok, J, Kim, D, Kim, D, Kim, H, Kim, Y, Myoung, S, Kim, D, Lim, SK (2006) Effects of a combined alendronate and calcitriol agent (Maxmarvil) on bone metabolism in Korean postmenopausal women: a multicenter, double-blind, randomized, placebo-controlled study. Osteoporos. Int. 17: pp. 1801
Suh, HW, Kim, HO, Kim, YS, Sunwoo, S, Lee, JA, Lee, HR, Kim, B, Kim, DH, Choi, YS, Cheong, YS, Yum, K, Yang, YJ, Yu, BY, Cho, CH, Park, SB, Shin, DH (2012) Korea Post-Marketing Surveillance Research Group. The efficacy and safety of a combined alendronate and calcitriol agent (maxmarvil): a postmarketing surveillance study in korean postmenopausal women with osteoporosis. Korean. J Fam. Med. 33: pp. 346
Trump, DL, Potter, DM, Muindi, J, Brufsky, A, Johnson, CS (2006) Phase II trial of high-dose, intermittent calcitriol (1,25 dihydroxyvitamin D3) and dexamethasone in androgen-independent prostate cancer. Cancer 106: pp. 2136
Orimo, H, Schacht, E (2005) The D-hormone analog alfacalcidol: the pioneer beyond the horizon of osteoporosis treatment. J. Rheumatol. Suppl. 76: pp. 4
Francis, RM, Boyle, IT, Moniz, C, Sutcliffe, AM, Davis, BS, Beastall, GH, Cowan, RA, Downes, N (1996) A comparison of the effects of alfacalcidol treatment and vitamin D2 supplementation on calcium absorption in elderly women with vertebral fractures. Osteoporos. Int. 6: pp. 284
Nuti, R, Bianchi, G, Brandi, ML, Caudarella, R, D’Erasmo, E, Fiore, C, Isaia, GC, Luisetto, G, Muratore, M, Oriente, P, Ortolani, S (2006) Superiority of alfacalcidol compared to vitamin D plus calcium in lumbar bone mineral density in postmenopausal osteoporosis. Rheumatol. Int. 26: pp. 445
Reginster, JY, Kuntz, D, Verdickt, W, Wouters, M, Guillevin, L, Menkès, CJ, Nielsen, K (1999) Prophylactic use of alfacalcidol in corticosteroid-induced osteoporosis. Osteoporos. Int. 9: pp. 75
Ringe, JD, Dorst, A, Faber, H, Schacht, E, Rahlfs, VW (2004) Superiority of alfacalcidol over plain vitamin D in the treatment of glucocorticoid-induced osteoporosis. Rheumatol. Int. 24: pp. 63
Dukas, L, Bischoff, HA, Lindpaintner, LS, Schacht, E, Birkner-Binder, D, Damm, TN, Thalmann, B, Stähelin, HB (2004) Alfacalcidol reduces the number of fallers in a community-dwelling elderly population with a minimum calcium intake of more than 500 mg daily. J. Am. Geriatr. Soc. 52: pp. 230
Dukas, L, Schacht, E, Mazor, Z, Stähelin, HB (2005) Treatment with alfacalcidol in elderly people significantly decreases the high risk of falls associated with a low creatinine clearance of <65 ml/min. Osteoporos. Int. 16: pp. 198
Ringe, JD, Farahmand, P, Schacht, E ( 2013 ) Alfacalcidol in men with osteoporosis: a prospective, observational, 2-year trial on 214 patients. Rheumatol. Int. 33: pp. 637
Gallagher, JC (2004) The effects of calcitriol on falls and fractures and physical performance tests. J. Steroid Biochem. Mol. Biol. 89–90: pp. 497
Ringe, JD, Farahmand, P, Schacht, E, Rozehnal, A (2007) Superiority of a combined treatment of Alendronate and Alfacalcidol compared to the combination of Alendronate and plain vitamin D or Alfacalcidol alone in established postmenopausal or male osteoporosis (AAC-Trial). Rheumatol. Int. 27: pp. 425
Matsumoto, T, Miki, T, Hagino, H, Sugimoto, T, Okamoto, S, Hirota, T, Tanigawara, Y, Hayashi, Y, Fukunaga, M, Shiraki, M, Nakamura, T (2005) A new active vitamin D, ED-71, increases bone mass in osteoporotic patients under vitamin D supplementation: a randomized, double-blind, placebo-controlled clinical trial. J. Clin. Endocrinol. Metab. 90: pp. 5031
Matsumoto, T, Kubodera, N (2007) ED-71, a new active vitamin D3, increases bone mineral density regardless of serum 25(OH)D levels in osteoporotic subjects. J. Steroid Biochem. Mol. Biol. 103: pp. 584
Matsumoto, T, Ito, M, Hayashi, Y, Hirota, T, Tanigawara, Y, Sone, T, Fukunaga, M, Shiraki, M, Nakamura, T (2011) A new active vitamin D3 analog, eldecalcitol, prevents the risk of osteoporotic fractures–a randomized, active comparator, double-blind study. Bone 49: pp. 605
Hagino, H, Takano, T, Fukunaga, M, Shiraki, M, Nakamura, T, Matsumoto, T ( 2013 ) Eldecalcitol reduces the risk of severe vertebral fractures and improves the health-related quality of life in patients with osteoporosis. J. Bone Miner. Metab. 31: pp. 183
Caraceni, MP, Gandolini, GC, Campanini, F, Iannetta, MA, Ortolani, S (1990) Vitamin D metabolites in spasmophilia. Biomed. Pharmacother. 44: pp. 479
Avenell, A, Mak, JC, O’Connell, D ( 2014 ) Vitamin D and vitamin D analogues for preventing fractures in post-menopausal women and older men. Cochrane Database Syst. Rev. 4: pp. CD000227