Красноярский государственный медицинский университет им. профессора В.Ф. Войно-Ясенецкого Россия, 660022, Красноярск, ул. Партизана Железняка, 1Открытие новых генетических предикторов сердечно-сосудистых заболеваний может использоваться при прогнозировании и диагностике скры-тых форм заболевания. Синдром Вольфа-Паркинсона-Уайта (WPW) встречается во всех возрастных группах и выявляется у 1-30 человек из 10000, его манифестация приходится в основном на молодой трудоспособный возраст (в среднем 20 лет), а риск внезапной сердечной смер-ти выше общепопуляционного. Цель. Изучить взаимосвязь синдрома WPW с полиморфизмом гена эндотелиальной синтазы азота NOS3 и выявление генетических предик-торов данной патологии. Материал и методы. Обследован 51человек с ЭКГ признаками синдрома Вольфа-Паркинсона-Уайта и 153 человек без каких-либо сердеч-но-сосудистых заболеваний. Пациенты разделены на подгруппы по половой принадлежности: 21 женщина, 30 мужчин. После подписания ин-формированного согласия пациентам проведено стандартное кардиологическое обследование (сбор анамнеза, электрокардиография, эхо-кардиография, велоэргометрия, чрезпищеводная электрическая стимуляция предсердий, холтеровское мониторирование) и производился забор крови для молекулярно-генетического исследования ДНК. Результаты. Полученные результаты показали статистически значимое преобладание редкого генотипа 4b\4b гена NOS3 в контрольной груп-пе женщин (16,3%; р<0,05) в сравнении с женщинами из основной группы, где данный генотип не встречался, тогда как генотип 4a\4a чаще встречался у женщин с синдромом WPW (81,0%; р<0,05), чем у женщин контрольной группы. У мужчин данного преобладания не обнару-жено. Заключение. Наличие генотипа 4b\4b гена NOS3 уменьшает вероятность возникновения синдрома WPW и его симптомов у лиц женского пола. У мужчин данного преобладания не обнаружено, предположительно, в связи с некоторыми механизмами гормональной регуляции. Резуль-таты могут использоваться при генетическом прогнозировании течения заболевания. Background. The discovery of new genetic predictors of cardiovascular diseases can be used in predicting and diagnosing latent forms of the disease. Wolff-Parkinson-White syndrome (WPW) occurs in all age groups and detected in 1-30 people per 10000, it manifests mainly in young age (on average 20 years), and the risk of sudden cardiac death is higher than in general population. Aim. To study the relationship of WPW syndrome with the polymorphism of endothelial nitric synthase gene (NOS3), and to identify genetic predictors of this syndrome. Material and methods. The study included 51 people with ECG proven WPW syndrome and 153 people with no cardiovascular disease. The patients were divided into subgroups according to sex: 21 women, 30 men. All patients underwent a standard cardiac examination (anamnesis, electrocardiography, echocardiography, bicycle ergometry, transesophageal electrical stimulation of the atria, Holter monitoring) and blood was taken for molecular genetic testing of DNA. Results. The results showed a statistically...
Existing approaches to in vitro maturation (IVM) of bovine oocytes do not take into account their specific demands during terminal phase of IVM including the need for increasing of their resistance to age-re-lated changes. In this work, we performed for the first time a comparative investigation of nuclear maturation and abnormal changes of MII chromosomes in bovine oocytes after their maturation in single-phase system and different two-phase systems and after the subsequent prolonged culture of the ova. When using the single-phase system, cumulus-oocyte complexes (COCs) were cultured for 24 h in the medium TCM 199 containing 10% fetal bovine serum (FBS), 10 μg/ml FSH, and 10 μg/ml luteinizing hormone (LH). In the two-phase system, oocytes matured in the same conditions for first 16 h and then in a new medium (TCM 199 containing 10% FBS (Control) or the same medium supplemented with 50 ng/ml progesterone) for the remaining 8 h of IVM. After maturation in the single-phase and the two-phase systems, a part of COCs were transferred to an aging medium (TCM 199 containing 10% FBS) and further cultured for 24 h. The state of the nuclear material (stage of meiosis and abnormal changes of MII chromosomes) in the matured and aged oocytes was assessed using cytogenetic analysis. The rate of oocytes being at the MII stage of meiosis after IVM in the single-phase and the two-phase systems was similar and amounted 82.7-86.3%. In addition, no effect of the culture system on the rate of MII oocytes with abnormal morphology of chromosomes was revealed. For the single-phase culture, this rate after the end of the IVM period was 32.2±0.5% and for the two-phase systems culture 38.5±4.0%. The prolonged culture of matured oocytes led to an increase the frequency of destructive changes in MII chromosomes to 56.9±2.9 and 68.4±3.0%, respectively. Progesterone in the IVM medium (during the last 8 hours) also did not effect on the rate of nuclear maturation, but reduced the rate of oocytes with abnormal changes in chromosomes: after IVM, as compared with the Control and the two-phase system; after 24-hours prolonged culture as compared to control (P <0.05). The results of the study suggest that the two-phase maturation of bovine oocytes may be used as an alternative to the conventional IVM protocol and that progesterone during the second phase of IVM causes an increase in the quality of ova and their resistance to subsequent age-related transformations.
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