Abstract
Introduction. Buccal epithelium (BE), in which cells the expression of signal molecules reflecting the state of homeostasis of the body in normal and pathological conditions is verified, is used as a diagnostic material for a number of diseases in adults.
The aim of the research was to study the circadian rhythm of melatonin receptor (MT) expression in the buccal epithelium of pregnant women and their newborn children for the possible development of a non-invasive method for molecular prediction of delayed postnatal pathology.
Methods. The MT in blood serum and receptors MT1 and MT2 in BE was studied in 13 pregnant women and their newborns on the 3rd day of life at 12.00 pm and at 04.00 am.
Results. The concentration of MT in the blood of healthy pregnant women (group 1) differed during the day and at night time (12.2±0.1 and 81.6±7.0 pg/ml, р<0,001, respectively). In patients with obesity and gestational diabetes (group 2), there were no circadian fluctuations in the level of MT (31.9±1.5 and 35.9±1.0 pg/ml, respectively, p>0.05). A similar pattern was also observed in newborns of both groups, but the concentration of MT in the blood was significantly lower than in mothers. The expression of MT receptors in the buccal epithelium in pregnant women of both groups had the same pattern of changes as the concentration of MT in the blood: the circadian rhythm of MT1 and MT2 receptors expression in patients of the first group and its absence in the second group. The children of group 1 had circadian fluctuations in the expression of MT1 and MT2, while they were absent in the second group. During the daytime in the first group, blood MT level correlated with the expression of MT2 ((R=0.5), and at night with MT1(R=0.78) and MT2 (R=0.4). In children of the second group, there were no correlation between the blood MT levels and the expression of receptors.
Conclusion. The results obtained give reason to consider the use of this non-invasive method promising for predicting the risk of delayed postnatal pathology, the development of which may be associated with intrauterine disruption of the formation of the circadian rhythm of MT
Authors and affiliations
I.I. Evsyukova(1), V.O. Polyakova(2), T.S. Kleimenova(3), I.M. Kvetnoy(4, 5), M.A. Paltzev(6)
1-Research Institute of Obstetrics, Gynecology, and Reproductology named after D.O. Ott,
Mendeleevskaya line 3, Saint-Petersburg, 199034, Russian Federation;
2-Scientific center St. Petersburg State Pediatric Medical University, st. Litovskaya 2, Saint-Petersburg, 194100, Russian Federation;
3-Department of Medical Biology St. Petersburg State Pediatric Medical University, st. Litovskaya 2, Saint- Petersburg, 194100, Russian Federation;
4-FSBI «St. Petersburg Research Institute of Phthisiopulmonology» of the Ministry of Health of the Russian Federation,
Ligovsky prospect, 2–4, St. Petersburg, 191036, Russian Federation;
5-Federal State Budgetary Educational Institution of Higher Education “St. Petersburg State University”,
Universitetskaya embankment, 7–9, St. Petersburg, 199034, Russian Federation;
6-FGBOU VO “Moscow State University named after M.V. Lomonosov”, Leninskie gory, no. 1, Moscow, 119991, Russian Federation