Telocytes in Umbilical Cord of Patients With and Without Pre-eclampsia

Patients fulfilling the eligibility criteria of the current research will be approached prior to delivery. The attending physician will explain the nature of the study and all patients will be asked to sign an informed consent. Routine investigations will be performed to all patients including CBC, liver and renal function and urine analysis in addition to albumin creatinine ratio. Ultrasound scanning including umbilical doppler indices measurement will be done for all cases before delivery using an HDI ultrasound system (AlbiniouTL Ultrasound, Bothell, WA, USA). Non stress test is routinely done for all hypertensive patients twice weekly as part of routine work up of such patients in our emergency unit using (CTG machine-NSL BT-350 Bistos) (Korea). Diagnosis of chronic hypertension, gestational hypertension and preeclampsia 1. preeclampsia: Women with PE fulfilled the criteria if they had hypertension (\> 140/90 mmHg) and proteinuria (\> 0.3 gm/day or ≥ +1 by dipstick urine analysis at ≥ 20 weeks of gestation or protein-to-creatinine ratio of 0.30 or more). If no proteinuria, hypertension associated with thrombocytopenia, renal or liver impairment, or pulmonary edema was sufficient to diagnose PE as per ACOG Practice Bulletin No .202\[6\]. 2. Gestational hypertension: It is usually diagnosed when systolic blood pressure is 140 mm Hg or more or a diastolic blood pressure of 90 mm Hg or more, or both, on two occasions at least 4 hours apart after 20 weeks of gestation, in a woman with a previously normal blood pressure \[7\]. Gestational hypertension is considered severe when the systolic level reaches 160 mm Hg or the diastolic level reaches 110 mm Hg, or both \[6\]. 3. Chronic hypertension: It means systolic blood pressure of 140 mm Hg or more, a diastolic blood pressure of 90 mm Hg or more, or both, that is diagnosed or present before pregnancy or before 20 weeks of gestation on two occasions at least 4 hours apart. Hypertension that is diagnosed for the first-time during pregnancy and that does not resolve in the typical postpartum period also is classified as chronic hypertension\[8\]. Patients are finally classified to PE with severe features, PE without severe features, Gestational hypertension (mild and severe), chronic hypertension and chronic hypertension with superimposed PE and termination will be done according to the recent recommendation of ACOG \[6, 8\]. Tissue and samples procurement and processing: Specimen preparation After delivery of the placenta, two tissue fragments, 1st piece about 1x1 cm from the central zone of the maternal surface of the placenta and 2nd piece about 1 x 1 cm from mid segment of umbilical cord will be cut. Each of both samples will be divided and fixed in either a 10% formalin for light microscopic examination or glutaraldehyde 2.5% for Electron microscopic examination. Paraffin-embedded placental tissue sections (4 μm thick) will be used for histological (stained with hematoxylin and eosin) and immunohistochemical examination using primary antibody markers for telocytes CD117, CD34, vimentin, SMA (smooth muscle actin), and the new telocyte marker TMEM16a (DOG-1).