<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE article PUBLIC "-//NLM//DTD JATS (Z39.96) Journal Publishing DTD v1.3 20210610//EN" "JATS-journalpublishing1-3.dtd">
<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">arthyper</journal-id><journal-title-group><journal-title xml:lang="ru">Артериальная гипертензия</journal-title><trans-title-group xml:lang="en"><trans-title>"Arterial’naya Gipertenziya" ("Arterial Hypertension")</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1607-419X</issn><issn pub-type="epub">2411-8524</issn><publisher><publisher-name>Antihypertensive League</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.18705/1607-419X-2015-21-6-623-629</article-id><article-id custom-type="elpub" pub-id-type="custom">arthyper-345</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>Статьи</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Articles</subject></subj-group></article-categories><title-group><article-title>Уровень обеспеченности витамином D у беременных с преэклампсией</article-title><trans-title-group xml:lang="en"><trans-title>Vitamin D level in pregnant women with preeclampsia</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Шелепова</surname><given-names>Е. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Shelepova</surname><given-names>E. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>научный сотрудник научно-исследовательской лаборатории репродукции и здоровья женщины Института перинатологии и педиатрии ФГБУ «СЗФМИЦ им. В. А. Алмазова» Минздрава России</p><p>ул. Аккуратова, д. 2, Санкт-Петербург, Россия, 197341</p></bio><bio xml:lang="en"><p>MD, Researcher, Department of Reproduction and Women Health, Institute of Perinatology and Pediatrics, V. A. Almazov Federal North-West Medical Research Centre</p><p>2 Akkuratov street, St Petersburg, 197341 Russia</p></bio><email xlink:type="simple">shelepowa@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Яковлева</surname><given-names>Н. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Yakovleva</surname><given-names>N. Yu.</given-names></name></name-alternatives><bio xml:lang="ru"><p>ассистент кафедры акушерства и гинекологии ФГБУ «СЗФМИЦ им. В. А. Алмазова» Минздрава России</p></bio><bio xml:lang="en"><p>MD, Assistant, Department of Obstetrics and Gynecology, V. A. Almazov Federal North-West Medical Research Centre</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Рябоконь</surname><given-names>Н. Р.</given-names></name><name name-style="western" xml:lang="en"><surname>Ryabokon’</surname><given-names>N. R.</given-names></name></name-alternatives><bio xml:lang="ru"><p>научный сотрудник научно-исследовательской лаборатории физиологии и патологии беременности и родов Института перинатологии и педиатрии ФГБУ «СЗФМИЦ им. В. А. Алмазова» Минздрава России</p></bio><bio xml:lang="en"><p>MD, Researcher, Department of Physiology and Pathology of Pregnancy and Delivery, V. A. Almazov Federal North-West Medical Research Centre</p></bio><email xlink:type="simple">natalis.1986@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Кузнецова</surname><given-names>Л. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Kuznetsova</surname><given-names>L. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>кандидат медицинских наук, заведующая научно-исследовательской лабораторией репродукции и здоровья женщины Института перинатологии и педиатрии ФГБУ «СЗФМИЦ им. В. А. Алмазова» Минздрава России</p></bio><bio xml:lang="en"><p>PhD, Chief, Department of Reproduction and Women Health, V. A. Almazov Federal North-West Medical Research Centre</p></bio><email xlink:type="simple">krivo73@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Хаджиева</surname><given-names>Э. Д.</given-names></name><name name-style="western" xml:lang="en"><surname>Khadzhieva</surname><given-names>E. D.</given-names></name></name-alternatives><bio xml:lang="ru"><p>доктор медицинских наук, профессор кафедры акушерства и гинекологии ФГБУ «СЗФМИЦ им. В. А. Алмазова» Минздрава России</p></bio><bio xml:lang="en"><p>MD, PhD, DSc, Professor, Department of Obstetrics and Gynecology, V. A. Almazov Federal North-West Medical Research Centre</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Зазерская</surname><given-names>И. Е.</given-names></name><name name-style="western" xml:lang="en"><surname>Zazerskaya</surname><given-names>I. E.</given-names></name></name-alternatives><bio xml:lang="ru"><p>доктор медицинских наук, заведующая кафедрой акушерства и гинекологии ФГБУ «СЗФМИЦ им. В. А. Алмазова» Минздрава России</p></bio><bio xml:lang="en"><p>MD, PhD, DSc, Head, Department of Obstetrics and Gynecology, V. A. Almazov Federal North-West Medical Research Centre</p></bio><email xlink:type="simple">zazera@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Федеральное государственное бюджетное учреждение «Северо-Западный федеральный медицинский исследовательский центр имени В. А. Алмазова» Министерства здравоохранения Российской Федерации, Санкт-Петербург, Россия</institution><country>Россия</country></aff><aff xml:lang="en"><institution>V. A. Almazov Federal North-West Medical Research Centre, St Petersburg, Russia</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2015</year></pub-date><pub-date pub-type="epub"><day>02</day><month>02</month><year>2016</year></pub-date><volume>21</volume><issue>6</issue><fpage>623</fpage><lpage>629</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Шелепова Е.С., Яковлева Н.Ю., Рябоконь Н.Р., Кузнецова Л.В., Хаджиева Э.Д., Зазерская И.Е., 2016</copyright-statement><copyright-year>2016</copyright-year><copyright-holder xml:lang="ru">Шелепова Е.С., Яковлева Н.Ю., Рябоконь Н.Р., Кузнецова Л.В., Хаджиева Э.Д., Зазерская И.Е.</copyright-holder><copyright-holder xml:lang="en">Shelepova E.S., Yakovleva N.Y., Ryabokon’ N.R., Kuznetsova L.V., Khadzhieva E.D., Zazerskaya I.E.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://htn.almazovcentre.ru/jour/article/view/345">https://htn.almazovcentre.ru/jour/article/view/345</self-uri><abstract><p>Цель исследования — оценка уровня витамина D у беременных с преэклампсией.</p><sec><title>Материалы и методы</title><p>Материалы и методы. Исследование — когортное, ретроспективное и проспективное. Обследовано 99 беременных репродуктивного возраста (средний возраст — 29 ± 2,1 года), с преэклампсией (основная группа, n = 48) и физиологической беременностью (контрольная группа, n = 51). Время включения — с сентября 2013 года по июнь 2014 года. Всем беременным произведен забор биообразцов крови с последующим определением уровня 25‑гидроксикальциферола. Все пациентки проживали в Санкт-Петербурге и Ленинградской области и получали поливитаминный комплекс, содержащий 400 МЕ витамина D.</p></sec><sec><title>Результаты</title><p>Результаты. Проанализированы 2 группы беременных. На основании проведенного исследования установлена частота выявления дефицита витамина D в основной группе — 73 %; в группе контроля дефицит витамина D не выявлен. Частота выявления недостаточности витамина D в основной группе — 25 %, в контрольной группе — 14 %. Частота нормального уровня витамина D в основной группе составила 2 %, в контрольной группе — 86 % (p &lt; 0,0001).</p></sec><sec><title>Заключение</title><p>Заключение. Данное исследование показало, что у пациенток с преэклампсией в 2,5 раза чаще встречается низкий уровень витамина D в сыворотке крови (менее 30 нг/мл), поэтому уровень витамина D у беременных женщин (недостаточность и дефицит) может являться одним из факторов риска развития преэклампсии.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Objective</title><p>Objective. The objective of this research was to estimate frequency of vitamin D deficiency and insufficiency in pregnant women with preeclampsia.</p></sec><sec><title>Design and methods</title><p>Design and methods. This is a cohort retrospective and prospective study. From September 2013 to June 2014 we enrolled 99 pregnant women (mean age 29 ± 2,1 years) with preeclampsia (main group, n = 48) and with physiological pregnancy (control group, n = 51). Blood samples were taken from all women for 25 (ОН)D detection. All patients were citizens of St Petersburg and Leningrad region. All of them took multivitamin complex containing vitamin D 400 IU.</p></sec><sec><title>Results</title><p>Results. Vitamin D deficiency was found in 73 % of women in the main group, while there was not a single case of vitamin D deficiency among controls. The occurrence of vitamin D insufficiency was 25 % and 14 % in the main and control groups, respectively. Only 2 % of women in the main group had normal level of vitamin D, while the rate of normal vitamin D level achieved 86 % in the control group (p &lt; 0,0001).</p></sec><sec><title>Conclusions</title><p>Conclusions. The frequency of serum vitamin D insufficiency (less than 30 ng/ml) is 2,5‑fold higher in pregnant women with preeclampsia than in control women. The role of vitamin D level (insufficiency and deficiency) as a risk factor for preeclampsia development should be considered in pregnancy.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>витамин D</kwd><kwd>25‑гидроксикальциферол</kwd><kwd>преэклампсия</kwd><kwd>беременность</kwd></kwd-group><kwd-group xml:lang="en"><kwd>vitamin D</kwd><kwd>25 (OH)D</kwd><kwd>preeclampsia</kwd><kwd>pregnancy</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Акушерство: национальное руководство. Под ред. В. И. Кулакова, Э. К. Айламазян, В. Е. Радзинского. М.: ГЭОТАР-Медиа, 2008. 1200 с. [Obstetrics: national guidelines. Eds. VI Kulakov, EK Ailamazyan, VE Radzinskiy. Moscow: GEOTARMedia, 2008. 1200 p. In Russian].</mixed-citation><mixed-citation xml:lang="en">Акушерство: национальное руководство. Под ред. В. И. Кулакова, Э. К. Айламазян, В. Е. Радзинского. М.: ГЭОТАР-Медиа, 2008. 1200 с. [Obstetrics: national guidelines. Eds. VI Kulakov, EK Ailamazyan, VE Radzinskiy. Moscow: GEOTARMedia, 2008. 1200 p. In Russian].</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Marya RK, Rathee S, Lata V, Mudgil S. Effects of vitamin D supplementation in pregnancy. J Gynecol Obstet Invest. 1981;12 (3):155–161.</mixed-citation><mixed-citation xml:lang="en">Marya RK, Rathee S, Lata V, Mudgil S. Effects of vitamin D supplementation in pregnancy. J Gynecol Obstet Invest. 1981;12 (3):155–161.</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">Diaz L, Noyola-Martinez N, Barrera D, Hernández G, Avila E, Halhali A et al. Calcitriol inhibits TNF-alpha-induced inflammatory cytokines in human trophoblasts. J Reprod Immunol. 2009;81 (1):17–24.</mixed-citation><mixed-citation xml:lang="en">Diaz L, Noyola-Martinez N, Barrera D, Hernández G, Avila E, Halhali A et al. Calcitriol inhibits TNF-alpha-induced inflammatory cytokines in human trophoblasts. J Reprod Immunol. 2009;81 (1):17–24.</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">Parlak M, Kalay S, Kalay Z, Kirecci A, Guney O, Koklu E. Severe vitamin D deficiency among pregnant women and their newborns in Turkey. J Matern Fetal Neonatal Med. 2015;28 (5):548–551.</mixed-citation><mixed-citation xml:lang="en">Parlak M, Kalay S, Kalay Z, Kirecci A, Guney O, Koklu E. Severe vitamin D deficiency among pregnant women and their newborns in Turkey. J Matern Fetal Neonatal Med. 2015;28 (5):548–551.</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">August P, Marcaccio B, Gertner JM, Druzin ML, Resnick LM, Laragh JH. Abnormal 1,25‑dihydroxyvitamin D metabolism in preeclampsia. Am J Obstet Gynecol. 1992;166 (4):1295–1299.</mixed-citation><mixed-citation xml:lang="en">August P, Marcaccio B, Gertner JM, Druzin ML, Resnick LM, Laragh JH. Abnormal 1,25‑dihydroxyvitamin D metabolism in preeclampsia. Am J Obstet Gynecol. 1992;166 (4):1295–1299.</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">Frolich A, Rudnicki M, Storm T, Rasmussen N, Hegedus L. Impaired 1,25‑dihydroxyvitamin D production in pregnancyinduced hypertension. Eur J Obstet Gynecol Reprod Biol. 1992; 47(1):25–29.</mixed-citation><mixed-citation xml:lang="en">Frolich A, Rudnicki M, Storm T, Rasmussen N, Hegedus L. Impaired 1,25‑dihydroxyvitamin D production in pregnancyinduced hypertension. Eur J Obstet Gynecol Reprod Biol. 1992; 47(1):25–29.</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">Haugen M, Brantsaeter AL, Trogstad L, Alexander J, Roth C, Magnus P et al. Vitamin D supplementation and reduced risk of preeclampsia in nulliparous women. Epidemiology. 2009;20 (5):720–726.</mixed-citation><mixed-citation xml:lang="en">Haugen M, Brantsaeter AL, Trogstad L, Alexander J, Roth C, Magnus P et al. Vitamin D supplementation and reduced risk of preeclampsia in nulliparous women. Epidemiology. 2009;20 (5):720–726.</mixed-citation></citation-alternatives></ref><ref id="cit8"><label>8</label><citation-alternatives><mixed-citation xml:lang="ru">Liu PT, Stenger S, Li H, Wenzel L, Tan BH, Krutzik SR et al. Toll-like receptor triggering of a vitamin D‑mediated human antimicrobial response. Science. 2006;311(5768):1770–1773.</mixed-citation><mixed-citation xml:lang="en">Liu PT, Stenger S, Li H, Wenzel L, Tan BH, Krutzik SR et al. Toll-like receptor triggering of a vitamin D‑mediated human antimicrobial response. Science. 2006;311(5768):1770–1773.</mixed-citation></citation-alternatives></ref><ref id="cit9"><label>9</label><citation-alternatives><mixed-citation xml:lang="ru">Hollis BW. Circulating 25‑hydroxyvitamin D levels indicative of vitamin D sufficiency: implications for establishing a new effective dietary intake recommendation for vitamin D. J Nutr. 2005;135(2):317–322.</mixed-citation><mixed-citation xml:lang="en">Hollis BW. Circulating 25‑hydroxyvitamin D levels indicative of vitamin D sufficiency: implications for establishing a new effective dietary intake recommendation for vitamin D. J Nutr. 2005;135(2):317–322.</mixed-citation></citation-alternatives></ref><ref id="cit10"><label>10</label><citation-alternatives><mixed-citation xml:lang="ru">Hollis BW, Wagner CL, Drezner MK, Binkley NC. Circulating vitamin D3 and 25‑hydroxyvitamin D in humans: An important tool to define adequate nutritional vitamin D status. J Steroid Biochem Mol Biol. 2007;103 (3–5):631–634.</mixed-citation><mixed-citation xml:lang="en">Hollis BW, Wagner CL, Drezner MK, Binkley NC. Circulating vitamin D3 and 25‑hydroxyvitamin D in humans: An important tool to define adequate nutritional vitamin D status. J Steroid Biochem Mol Biol. 2007;103 (3–5):631–634.</mixed-citation></citation-alternatives></ref><ref id="cit11"><label>11</label><citation-alternatives><mixed-citation xml:lang="ru">Holick MF. Vitamin D deficiency. N Engl J Med. 2007;357 (3):266–281.</mixed-citation><mixed-citation xml:lang="en">Holick MF. Vitamin D deficiency. N Engl J Med. 2007;357 (3):266–281.</mixed-citation></citation-alternatives></ref><ref id="cit12"><label>12</label><citation-alternatives><mixed-citation xml:lang="ru">Baker AM, Haeri S, Camargo CA Jr, Espinola JA, Stuebe AM. First trimester maternal vitamin D status and risk of gestational diabetes: nested case-control study. Diabetes Metab Res Rev. 2012;28(2):164–168.</mixed-citation><mixed-citation xml:lang="en">Baker AM, Haeri S, Camargo CA Jr, Espinola JA, Stuebe AM. First trimester maternal vitamin D status and risk of gestational diabetes: nested case-control study. Diabetes Metab Res Rev. 2012;28(2):164–168.</mixed-citation></citation-alternatives></ref><ref id="cit13"><label>13</label><citation-alternatives><mixed-citation xml:lang="ru">Robinson CJ, Alanis MC, Wagner CL, Hollis BW, Johnson DD. Maternal vitamin D and fetal growth in early-onset severe preeclampsia. Am J Obstet Gynecol. 2011;204(6):551–554.</mixed-citation><mixed-citation xml:lang="en">Robinson CJ, Alanis MC, Wagner CL, Hollis BW, Johnson DD. Maternal vitamin D and fetal growth in early-onset severe preeclampsia. Am J Obstet Gynecol. 2011;204(6):551–554.</mixed-citation></citation-alternatives></ref><ref id="cit14"><label>14</label><citation-alternatives><mixed-citation xml:lang="ru">Liu NQ, Kaplan AT, Lagishetty V, Ouyang YB, Ouyang Y, Simmons CF et al. Vitamin D and regulation of placental inflammation. J Immunol. 2011;186(10):5968–5974.</mixed-citation><mixed-citation xml:lang="en">Liu NQ, Kaplan AT, Lagishetty V, Ouyang YB, Ouyang Y, Simmons CF et al. Vitamin D and regulation of placental inflammation. J Immunol. 2011;186(10):5968–5974.</mixed-citation></citation-alternatives></ref><ref id="cit15"><label>15</label><citation-alternatives><mixed-citation xml:lang="ru">Mayhew TM. Fetoplacental angiogenesis during gestation is biphasic, longitudinal and occurs by proliferation and remodeling of vascular endothelial cells. Placenta. 2002;23(10):742–750.</mixed-citation><mixed-citation xml:lang="en">Mayhew TM. Fetoplacental angiogenesis during gestation is biphasic, longitudinal and occurs by proliferation and remodeling of vascular endothelial cells. Placenta. 2002;23(10):742–750.</mixed-citation></citation-alternatives></ref><ref id="cit16"><label>16</label><citation-alternatives><mixed-citation xml:lang="ru">Jaffe R, Jauniaux E, Hustin J. Maternal circulation in the first trimester human placenta — myth or reality? Am J Obstet Gynecol 1997;176:695–705.</mixed-citation><mixed-citation xml:lang="en">Jaffe R, Jauniaux E, Hustin J. Maternal circulation in the first trimester human placenta — myth or reality? Am J Obstet Gynecol 1997;176:695–705.</mixed-citation></citation-alternatives></ref><ref id="cit17"><label>17</label><citation-alternatives><mixed-citation xml:lang="ru">Gale CR, Robinson SM, Harvey NC, Javaid MK, Jiang B, Martyn CN et al. Maternal vitamin D status during pregnancy and child outcomes. Eur J Clin Nutr. 2008;62(1):68–77.</mixed-citation><mixed-citation xml:lang="en">Gale CR, Robinson SM, Harvey NC, Javaid MK, Jiang B, Martyn CN et al. Maternal vitamin D status during pregnancy and child outcomes. Eur J Clin Nutr. 2008;62(1):68–77.</mixed-citation></citation-alternatives></ref><ref id="cit18"><label>18</label><citation-alternatives><mixed-citation xml:lang="ru">Lewis S, Lucas RM, Halliday J, Ponsonby AL. Vitamin D deficiency and pregnancy: from conception to birth. Mol Nutr Food Res. 2010;54(8):1092–1102.</mixed-citation><mixed-citation xml:lang="en">Lewis S, Lucas RM, Halliday J, Ponsonby AL. Vitamin D deficiency and pregnancy: from conception to birth. Mol Nutr Food Res. 2010;54(8):1092–1102.</mixed-citation></citation-alternatives></ref><ref id="cit19"><label>19</label><citation-alternatives><mixed-citation xml:lang="ru">Wehr E, Pieber TR, Obermayer-Pietsch B. Effect of vitamin D3 treatment on glucose metabolism and menstrual frequency in PCOS women pilot study. J Endocrinol Invest. 2011;34 (10):757–763.</mixed-citation><mixed-citation xml:lang="en">Wehr E, Pieber TR, Obermayer-Pietsch B. Effect of vitamin D3 treatment on glucose metabolism and menstrual frequency in PCOS women pilot study. J Endocrinol Invest. 2011;34 (10):757–763.</mixed-citation></citation-alternatives></ref><ref id="cit20"><label>20</label><citation-alternatives><mixed-citation xml:lang="ru">Weinert LS, Silveiro SP. Maternal-fetal impact of vitamin D deficiency: a critical review. J Matern Child Health. 2015;19 (1):94–101.</mixed-citation><mixed-citation xml:lang="en">Weinert LS, Silveiro SP. Maternal-fetal impact of vitamin D deficiency: a critical review. J Matern Child Health. 2015;19 (1):94–101.</mixed-citation></citation-alternatives></ref><ref id="cit21"><label>21</label><citation-alternatives><mixed-citation xml:lang="ru">Novakovic B, Sibson M, Ng HK, Manuelpillai U, Rakyan V, Down T et al. Placenta-specific methylation of the vitamin D 24‑hydroxylase gene: implications for feedback autoregulation of active vitamin D levels at the fetomaternal interface. J Biol Chem. 2009;284(22):14838–14848.</mixed-citation><mixed-citation xml:lang="en">Novakovic B, Sibson M, Ng HK, Manuelpillai U, Rakyan V, Down T et al. Placenta-specific methylation of the vitamin D 24‑hydroxylase gene: implications for feedback autoregulation of active vitamin D levels at the fetomaternal interface. J Biol Chem. 2009;284(22):14838–14848.</mixed-citation></citation-alternatives></ref><ref id="cit22"><label>22</label><citation-alternatives><mixed-citation xml:lang="ru">Powe CE, Seely EW, Rana S, Bhan I, Ecker J, Karumanchi SA et al. First trimester vitamin D, vitamin D‑binding protein, and subsequent preeclampsia. Hypertension. 2010;56(4):758–763.</mixed-citation><mixed-citation xml:lang="en">Powe CE, Seely EW, Rana S, Bhan I, Ecker J, Karumanchi SA et al. First trimester vitamin D, vitamin D‑binding protein, and subsequent preeclampsia. Hypertension. 2010;56(4):758–763.</mixed-citation></citation-alternatives></ref></ref-list><fn-group><fn fn-type="conflict"><p>The authors declare that there are no conflicts of interest present.</p></fn></fn-group></back></article>
