. Cases were chosen based on the histological grades and clinical stages of EOC patients according to the International Federation of Gynecology and Obstetrics criteria. The healthy control subjects were enrolled from laparoscopy negative cases on the clinical assessment at the same hospital. No significant difference in age was found between these two groups. The consent form was signed by all patients and the research protocol was approved by the Institutional Committee for the Pro tection of Human Subjects of Capital Medical University. Cases were excluded if patients were associated with 1 autoimmune diseases and endocrinal diseases, 2 com plications derived from other different organ systems, 3 immune deficiencies diseases, 4 significant gastrointes tinal diseases.

ARQ 621 concentration All clinical and laboratory data were recorded. Serum samples were collected from the patients in both groups and stored at 80 C until use. Measurement of AT1 AA titer and VEGF by enzyme linked immunosorbent assay The serum AT1 AA level in patients was detected by ELISA as we reported previously. Briefly, 96 well mi crotiter plates were coated with 1 ug ml AT1R ECII pep tide synthesized from patients and incubated overnight at 4 C. After washing the plates with PBS three times, 50 ul serum sam ples were added to the plates and incubated at 37 C for 1 h. The biotinylated goat anti human IgG antibody or streptavidin peroxidase conjugate was then incubated separately at 37 C for 1 h during washings. Fi nally, 2, 2 azino di sulphonic acid H2O2 substrate buffer was applied for a half hour before reading.

The optical densities from these plates were measured at 405 nm in a plate reader. The AT1 AA titer was expressed as the ratio of positive nega tive, i. e, The positivity of the serum selleck FH535 sample to AT1 AA was defined as P N 2. 1, while the negativity was defined as P N 1. 5. All assays were performed in duplicate. Com mercially accessible ELISA kit were used to determine the pa tients serum VEGF level according to the manufacturers instructions. VEGF concentration was expressed as ng L and the assays were performed in duplicate. AT1 AA peptide synthesis AT1 AA peptide fragments equivalent to the sequence of human anti AT1 receptor antibody was synthesized by solid phase peptide synthesis method. The purity of synthetic peptide was confirmed with a high pressure li quid chromatography as we reported previously.

Purification of the immunoglobulin G fraction The total immunoglobulin G was isolated from serum samples with AT1 AA positive EOC patients or AT1 AA negative healthy normal subjects by Mab Trap Kit. The purities of extractions were assessed by sodium dodecylsulfonate polyacrylate gel elec trophoresis as we reported previously. Cell lines and cell migration assay Human ovarian cancer cel