Vitamin d 2 ergocalciferol is derived from the plant sterol ergosterol. Vitamin d supplementation in obesity and during weight. Vitamin d insufficiency is widespread in hivinfected patients. Several studies in general population have shown a high prevalence 5097% of.
The effect of efavirenz on vitamin d metabolism is hypothesized to occur through the induction of 24hydroxylase, a cytochrome p450 enzyme, that inactivates 25ohd and 1,25ohd, similar to the effects of antiepileptics 24, 26, 27. Vitd plays a key role in the effector activity of innate immune cells in response to microbial infections. Effects of switching from efavirenz to raltegravir on. There has been growing interest in vitamin d status and metabolism in patients with human.
Vitamin d deficiency is common in youth with hiv1 infection in the united states 1, 2. Current efavirenz use was positively associated with postrepletion. Vitamin d deficiency can result in lower bone mineral density and an increased risk of reduced bone density osteoporosis or bone fracture because a lack of vitamin d alters mineral metabolism in the body. Calcium intake should be optimized, averaging mg per day including diet and supplements, to be taken in divided amounts through the day for. Apr 14, 2020 tdf administration disrupts vitamin d metabolism, 29,30 and the decrease in bmd associated with tdf initiation was attenuated in adults with coadministration of high doses of vitamin d3 4,000 international units iu daily and calcium carbonate 1,000 mg daily for the first 48 weeks of tdf treatment. Current efavirenz use was positively associated with postrepletion 25ohd levels. Apr 21, 2016 as previous reports have indicated an increased risk of low bone mineral density and compromised vitamin d levels in patients treated with the antiretroviral drugs efavirenz and ritonavir, as well as with the glucocorticoid dexamethasone, it was of interest to study the effects of the drugs on the vitamin d 3 metabolism and mineralization in. In the hivinfected patients under treatment with efavirenz, vitamin d deficiency is prevalent. Recommendations for treatment of vitamin d deficiency all adults who are vitamin d deficient be treated with 50,000 iu of vitamin d2 or vitamin d3 once a week for 8 weeks followed by maintenance dose of 15002000 iuday of vitamin d3 obese adults, patients with malabsorption syndromes and patients on medications affecting vitamin d metabolism.
Methods treatmentnaive hiv patients with n102 or without n89 tuberculosis coinfection were enrolled prospectively. Vitamin d metabolism, mechanism of action, and clinical. Urinary calcium excretion was significantly lower in all patients on tdf. The largest group is that of patients with 25 oh d level between 1030 ngml 73 % n105. Hiv infection and antiretroviral therapy art may create unique risk factors for vitamin d insufficiency, including alterations of vitamin d metabolism by art. While the reasons for this could be many, it is clear that hiv infection, in and of itself, contributes to this and that continued deficiency could have a negative impact on your longterm health. Adverse effects of antiretroviral medications question 620 hiv. Vieth r 2007 vitamin d toxicity, policy, and science. Metabolic complications of efavirenz gary maartens division of clinical pharmacology university of cape town iyunivesithi yasekapa universiteit van kaapstad. Although the only 50,000iu preparation available by prescription from pharmacies in the united states is vitamin d 2, vitamin d 3 is more. However, the exact mechanism and whether 24hydroxylase activity is attenuated over time have not been established.
Oral route tablet severe acute exacerbations of hepatitis b virus hbv have been reported in patients who are coinfected with hiv1 and hbv and have discontinued products containing emtricitabine ftc andor tenofovir disoproxil fumarate tdf, which are components of efavirenz emtricitabine tenofovir disoproxil fumarate. During monocytes and macrophages activation, the vdr and the enzyme 1. Effects of switching from efavirenz to raltegravir on endothelial function, bone mineral metabolism. Vitamin d metabolism and action article pdf available in osteoporosis international 8 suppl 2s2. Excreted in bile metabolized to water soluble metabolites and then excreted in. Distribution stored in adipose tissue metabolism transported to the liver, then kidneys, where it is activated 6. Background initiation of efavirenz based combination antiretroviral therapy cart is associated with vitamin d deficiency, but the risk factors for cartinduced severe vitamin d deficiency svdd and the impact of antituberculosis tb cotreatment is not explored well. Substitution of vitamin d 3 and calcium did not result in normal serological bone metabolism markers. Thus, vitamin d is also critical for bone remodeling through its role as a potent stimulator of bone resorption. In addition, haart may impair vitamin d metabolism 15, 16 as shown by.
Efavirenz efv, nevirapine nvp, tenofovir tdf and protease. Cholecalciferol is also available through diet via animal sources. S9 february 1998 with 1,107 reads how we measure reads. The effect of tenofovir on vitamin d metabolism in hiv. Metabolic complications of hiv infection journal of. Tenofovir df nucleoside and nucleotide analogue reverse. Aug 18, 2015 hiv infection and antiretroviral therapy art may create unique risk factors for vitamin d insufficiency, including alterations of vitamin d metabolism by art. Efv induces the metabolism of vitamin d, resulting in lower concentrations efv independently associated with lower bone mineral density in a crosssectional study in cape town plos one 1012. Low vitamin d levels have been observed in hivinfected patients from high latitudes, with consequently reduced bone mineral density bmd, but data from the tropics are scarce. Vitamins have essential roles in metabolic processes.
Calcidiol 25ohd, the circulating form of vitamin d and the best indicator of total body vitamin d, was measured in all patients in addition to the regular blood panel, which included renal, bone, liver and lipid profiles, full blood count, cd4 cell count, and hiv rna level. The association of gender, age, efavirenz use, and. Efavirenz, lamivudine and tenofovir fda prescribing. The effect of antiretrovirals on vitamin d michael yin,1 and emily stein2 1division of infectious diseases and 2 division of endocrinology, columbia university medical center, new york, new york see the article by dao et al, on pages 396405. We have not found any study that evaluated effects of vitamin d supplementation on the bone specific biomarkers in hiv positive patients under treatment with antiretroviral regimen containing efavirenz. Oct 16, 2014 absorption vitamin d is absorbed from the small intestine for which bile is essential. Moreover, the vitamin d activating enzyme cyp27b1 is also expressed in various immune cells, as well as intestinal epithelial cells 5, 6. Mar 29, 2016 vitamin d, which is important for calcium homeostasis and bone metabolism, has several noncalcemic actions.
Vitamin d deficiency and altered bone mineral metabolism in hiv. Efavirenz treatment and falsepositive results in benzodiazepine screening tests. Distribution of patients according to their 25oh d serum level. Vitamin d is metabolized first to 25 hydroxyvitamin d 25ohd, then to the hormonal form 1,25dihydroxyvitamin d 1,25oh 2 d. Efavirenz reduces the expression of the cytochrome p450 enzyme cyp2r1 which is involved in converting vitamin d3 into 25 hydroxyvitamin d efavirenz upregulates cyp24 which converts active vitamin d to inactive metabolites. The effect of antiretrovirals on vitamin d pdf attached. Detailed descriptions of vitamin d physiology and metabolism have been. Effects of cholecalciferol supplementation on serum and. Symfi is a threedrug fixeddose combination product containing 600 mg of efavirenz efv, 300 mg of lamivudine 3tc, and 300 mg of tenofovir disoproxil fumarate tdf. D has wellknown regulatory functions in calcium metabolism, but is.
Efavirenzcontaining cart regimens adversely affected vitamin d levels. Pdf hiv infection and antiretroviral therapy art may create unique risk. Vitamin d is synthesized in the form of cholecalciferol vitamin d 3 in the epidermis upon exposure to ultraviolet light. However, few data from randomized, controlled trials exist. Efv induces the metabolism of vitamin d resulting in low vitd crosssectional study in cape town showed efv independently associated with lower bone mineral density medicine 2016 95.
Vitamin d deficiency vdd has been associated with numerous adverse health outcomes, including rickets, osteomalacia, cardiovascular mortality, cancer, autoimmune. Vitamin and mineral requirements in human nutrition. In a multivariate model that included all 1077 patients, sampling in winter, black ethnicity, nadir cd4 cell count less than 200 cells. High prevalence of vitamin d deficiency in hiv infected on. Vitamin d deficiency is very high in hiv patients on antiretroviral therapy. Efavirenz is associated with severe vitamin d deficiency and. These two vital players of vitamin d metabolism have also been colocalized in different cells of the gi tract suggesting the need for active vitamin d in those cells 7.
Effect of antiretrovirals on vitamin d clinical infectious diseases. After changing the antiretroviral regimen from efavirenz boosted to ritonavirboosted saquinavir, the laboratory parameters began to normalize. These forms of vitamin d, which are inert and have a short halflife, are converted in the liver via 25 hydroxylase to 25ohd 3, or calcidiol. Hiv andor antiretroviral therapy art, particularly efavirenz efv, may interfere with vitamin d metabolism. Decrease of vitamin d concentration in patients with hiv infection on. After changing the antiretroviral regimen from efavirenzboosted to ritonavirboosted saquinavir, the laboratory parameters began to normalize. Vitamin d deficiency appeared to be overriding the effect of tdf on 1. The positive effects of vitamin d in different acute and chronic diseases e. Those serum levels are defined as deficiency of vitamin d. Tdf administration disrupts vitamin d metabolism, 29,30 and the decrease in bmd associated with tdf initiation was attenuated in adults with coadministration of high doses of vitamin d3 4,000 international units iu daily and calcium carbonate 1,000 mg daily for the first 48 weeks of tdf treatment. Vitamin d supplementation in obesity and during weight loss. Vitamin d is essential for regulating numerous biologic processes through the widespread distribution of its receptor and activating enzymes. Pdf effect of vitamin d3 supplementation on hivinfected.
Efavirenz is associated with severe vitamin d deficiency. Effect of antiretrovirals on vitamin d clinical infectious. Recommendations for correction of vitamin d deficiency vary widely 312, but vitamin d 2 or d 3 50,000 iu weekly for 5 to 8 weeks is commonly recommended. After supplementation with single dose of 300,000 iu vitamin d in this population, the activation of osteoblasts and osteoclasts stimulates bone formation and resorption respectively with favorable bone formation without any adverse event. Sep 12, 2012 this study was not able to demonstrate a link between hyperparathyroidism and altered bone metabolism nor renal tubular dysfunction frequently seen in patients on tdf. Efavirenz, lamivudine and tenofovir disoproxil fumarate tablets is not recommended for patients with creatinine clearance less than 50 ml per min or patients with endstage renal disease esrd requiring hemodialysis because efavirenz, lamivudine and tenofovir disoproxil fumarate tabletsit is a fixeddose combination and the dosage of the. Vitamin d, bone, and hiv infection pubmed central pmc. The effect of efavirenz on vitamin d metabolism is hypothesized to occur through the induction of 24hydroxylase, a cytochrome p450 enzyme. Absorption vitamin d is absorbed from the small intestine for which bile is essential. This study was not able to demonstrate a link between hyperparathyroidism and altered bone metabolism nor renal tubular dysfunction frequently seen in patients on tdf. Vitamin d, in its biologically active form calcitriol 1,25oh 2 d, plays an important role in calcium homeostasis, regulation of bone turnover, innate immune function, cell proliferation, and cell differentiation. Vitamin d status also modified the effects of tenofovir on serum concentrations of 1,25oh 2d and phosphate. Vitamin d is attributed to calcium and phosphate metabolism. Klassen k, martineau ar, wilkinson rj, cooke g, courtney ap, et al.
The antiretroviral drugs efavirenz and ritonavir as well as the. Vitamin d 3 is made in the skin from 7dehydrocholesterol under the influence of uv light. As previous reports have indicated an increased risk of low bone mineral density and compromised vitamin d levels in patients treated with the antiretroviral drugs efavirenz and ritonavir, as well as with the glucocorticoid dexamethasone, it was of interest to study the effects of the drugs on the vitamin d 3 metabolism and mineralization in. Effects of vitamin d supplementation on the bone specific. Efavirenz can cause worsening of underlying psychosis, mania, or insomnia, but has not been associated with higher rates of suicidality efavirenz affects vitamin d metabolism and thus 25oh vitamin d levels should be monitored while on efavirenz because levels may become dangerously elevated.
Frontiers the potential protective role of vitamin d. Vitamins may be divided into a fatsoluble group a d e, and k and a watersoluble group the b complex and c. In hivinfected persons, the safety of vitamin d supplementation has also. Other studies have shown an increase in vitamin d level with switching from efavirenz to ritonavirboosted r atazanavir, a greater decrease with efavirenz than with rilpivirine. Once vitamin d deficiency is corrected, maintenance doses of 600 iu vitamin d daily are currently recommended by the iom for persons from 170 yr of age, although others recommend higher daily or monthly doses, and vitamin d 3 100,000 iu every 2 months has been used for chronic supplementation in children and youth with hiv infection. Hiv linked to vitamin d deficiency verywell health. Finally, dilution in a large body volume and sequestration in adipose tissue were also proposed 10,16.
Treatment goal is to have a vitamin d level of at least 30 ngml, based on endocrine society practice guidelines 108, and may require supplementation with 2000 units of vitamin d daily. Excreted in bile metabolized to water soluble metabolites and then excreted in urine as well. Dailymed symfi efavirenz, lamivudine and tenofovir. Change in vitamin d levels occurs early after antiretroviral therapy. Adverse effects of antiretroviral medications question 620. All of these markers were measured in batch from archived frozen samples kept at. It was reported that antiretroviral drugs such as efavirenz can increase the catabolism of vitamin d in hiv infected individuals.
Vitamin d is an important nutrient for bone health, calcium balance, and immune function yet it is often found to be low in many people living with hiv. Vitamin metabolism vitamins are organic compounds that function as metabolic catalysts usually in the form of coenzymes smith 1970. The local metabolism of vitamin d and its role in bone has been. Effects of switching from efavirenz to raltegravir on endothelial function, bone mineral metabolism, inflammation, and renal function. Journal of acquired immune deficiency syndromes 1999, 643, 279283. The longer a person took efavirenz, the greater the risk of developing vitamin d deficiency vitamin d deficiency was not linked to the use of the following drugs.
1208 881 1137 605 68 1105 62 1452 1256 418 140 494 177 1448 1282 376 608 70 578 245 583 627 843 586 325 816 1037 684 920 1039 1479 357 1078 337 1006