All histology slides were staged and classified according to the UICC new TNM staging (7th EX 527 edition). The peritoneal tissues were directly obtained from the surgical suite and immediately fixed in 10% buffered formalin and then embedded in paraffin. Sections (5 μm) were prepared and stained with hematoxylin and eosin and Masson stain. The thickness of the submesothelial

extracellular matrix was determined after the tissue sections were hematoxylin and eosin and Masson staining, the average of 10 independent measurements was calculated for each section and then the data were summarized. ELISA detection of TGF-β1 levels selleck in the peritoneal lavage fluid The peritoneal lavage fluid was also collected from each patient. Briefly, during laparotomy, 100 mL physiological saline was injected into the right upper quadrant or the Douglas pouch and approximately 60 mL were retrieved.

The peritoneal lavage sample was immediately centrifuged at 2000 rpm for 10 min at room selleck chemicals llc temperature, and stored at -80°C until use. The TGF-β1 levels were then assayed with a human TGF-β1 ELISA kit according to the manufacturer’s instructions. The data on the TGF-β1 protein levels were summarized as mean ± SE of each sample. Semi-quantitative reverse transcription polymerase chain reaction (RT-PCR) The cells were grown to subconfluence and then starved for 15 h in serum-free medium to attain quiescence. Afterwards, the cells were washed twice with PBS and cultured in either serum-free medium (control) or serum-free plus 2 or 10 ng/mL of TGF-β1 (experimental group) for up to 72 h. Total RNA was isolated from these cells using the TRIzol reagent Dynein according to the manufacturer’s instructions. One microgram of the total cellular RNA was then reverse-transcribed into cDNA for PCR amplification using

a kit from Sigma. The primer sequences used for PCR have been listed in Table 1. Amplification consisted of an initial 5 min incubation at 95°C and then 30 cycles of amplification using 30 s of denaturation at 95°C, 30 s at 56°C, and 60 s at 72°C. The final extension was set for 10 min at 72°C. All data were expressed as the relative differences between control and treated cells after normalization to β-actin expression. Table 1 Primers used for semi-quantitative RT-PCR Primer Sequence Length (bp) Collagen III-F 5′-GGACCACCAGGGCCTCGAGGTAAC-3′ 471 Collagen III-R 5′-TGTCCACCAGTGTTTCCGTG-3′   Fibronectin-F 5′-TGGACCTTCTACCAGTGCGAC-3′ 451 Fibronectin-R 5′-TGTCTTCCCATCATCGTAACAC-3′   β-actin-F 5′-CCTCGCCTTTGCCGATCC-3′ 626 β-actin-R 5′-GGATCTTCATGAGGTAGTCAGTC-3′   Protein extraction and western blotting After the cells were grown and treated with or without TGF-β1, total cellular protein was extracted using a lysis buffer and quantified using protein quantification reagents from Bio-Rad.