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Cl, pH 6.8, 2% SDS, 0.1% ��-mercaptoethanol, 10% glycerol, 0.2?mg/ml bromophenol blue) and separated on 10% SDS/PAA gels. PageRuler Plus (ThermoFisher Scientific, Waltham, MA) was used as molecular size marker. Proteins were transferred onto PVDF membranes (Hybond-P, Amersham, Pharmacia Biotech, Piscataway, NJ) and after blocking in 5% non-fat dried milk in TBS-T, membranes were incubated [https://en.wikipedia.org/wiki/MASP1_(protein) MASP1] with the following primary antibodies, diluted in 5% BSA in TBS-T: uPA (monoclonal mouse, clone 204212, 1?��g/ml, 55?kDa-precursor, 35?kDa-active enzyme, R&D Systems Inc.), PAI-1 (monoclonal mouse, 1?��g/ml, 47?kDa, Oncogene) and PAI-2 (monoclonal mouse, clone HD-PAI-2 22.1, 2?��g/ml, 48?kDa, American Diagnostica GmbH). After washing in TBS-T, membranes were incubated with secondary anti-mouse Ig horseradish peroxidase-linked antibodies (132?ng/ml, GE Healthcare, Little Chalfont, UK) and developed for 5?min by using Amersham ECL Prime Western blotting reagent (GE Healthcare). Protein quantification was done by densitometrical scanning using AlphaView software (Alpha Innotech, San Leandro, CA). For evaluation of cellular IL-1R1 expression, protein extracts of EVT isolated after 48?h of cultivation on fibronectin [http://www.selleckchem.com/products/azd6738.html AZD6738 mouse] were analysed as previously mentioned [21]. GAPDH (1?��g/ml, Ambion) was used as loading control. Statistical analyses were performed using SPSS 18 (SPSS Inc., Chicago, IL) using Student's paired t-test. Gaussian distribution and equality of variances were examined with Kolmogorov�CSmirnov test and Levene's test, respectively. A p-value [http://www.selleckchem.com/products/pfi-2.html PFI-2] published gene chip data, immunofluorescence of first trimester placental tissues and primary EVT, as well as Western blot analyses were performed (Fig.?1). Recently, mRNA expression profiles of trypsin-isolated first trimester vCTB (n?=?5) and primary EVT, isolated from differentiating villous explant cultures seeded on Matrigel (n?=?6) were established [25]. Transcript levels of IL-1R1, integrins (��5, ��6) and HLA-G1 in vCTB and primary EVT cell pools are depicted ( Fig.?1A). Whereas IL-1�� mRNA was absent from EVT (data not shown), IL-1R1 transcripts were expressed at higher levels in EVT similar to the differentiation-associated genes integrin ��5 and HLA-G1. Accordingly, immunofluorescence of primary EVT revealed that the number of IL-1R1-expressing cells time-dependently increased upon cultivation on fibronectin concomitant with the differentiation-dependent elevation of the EVT marker integrin ��1 ( Fig.?1B) as previously noticed [21].