Effect of Different Concentrations of Neogenin on Proliferation,Apoptosis and Related Proliferative Factors in Human Trophoblasts

The underlying effect of different concentrations of neogenin on proliferation, apoptosis and the related proliferative factors in human trophoblasts was explored in order to understand the function of neogenin during placentation. TEV-1 cell line was cultured and the expression of netrin-1 was detected by using indirect cellular immunofluorescence. Exponentially growing TEV-1 cells were treated by different concentrations of neogenin (0, 1, 5, 10, 50 ng/mL) for 24 h. Cell viability was measured by 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide (MTT) assay. TEV-1 cell apoptosis was assessed by flow cytometry (FCM). The expression of netrin-1 mRNA and protein in TEV-1 cells was examined by using real-time PCR and Western blot, respectively. It was found that immunoreactivity for netrin-1 was observed in cytoplasm of the trophoblasts. Immediately after treatment with different concentrations of neogenin for 24 h, the netrin-1 expression began to increase. Real-time PCR revealed that the expression level of netrin-1 mRNA was 37.59±10.25 times higher than control group when TEV-1 cells were exposed to 50 ng/mL neogenin (P<0.01), and the same tendency was seen by using Western blot. MTT results showed that proliferation of TEV-1 cells was independent of neogenin. Meanwhile, apoptosis was significantly increased to (22.15±6.15)% at 50 ng/mL neogenin and (6.55±0.25)% without neogenin (P<0.01). It is suggested that neogenin regulates proliferation and apoptosis of TEV-1 cells. And it can enhance the ability of TEV-1 cells to express netrin-1 in a dose-dependent manner. Neogenin may play an important biological role in the normal human pregnancy and contribute to the physiological pregnancy process.

Effects of epidermal growth factor receptor inhibitor on proliferative cholangitis in hepatolithiasis

BACKGROUND： There is currently no effective medication to prevent stone recurrence after choledochoscopic lithotomy or to treat proliferative cholangitis（PC）, which is the pathologic basis of hepatolithiasis. This study aimed to investigate whether gefitinib, an epidermal growth factor receptor（EGFR） inhibitor, inhibited cholangio hyperplasia and lithogenesis in PC.METHODS： After cholangioscopic lithotomy, indwelling catheters were placed in the diseased bile duct lumens in 94 patients with hepatolithiasis. Subsequently, 49 of the 94 patients were treated with 250 mg gefitinib solution via a catheter twice a week, and they were subjected to choledochoscopic biopsy at 6 and 12 weeks. The rest 45 hepatolithiasis patients without gefitinib treatment served as controls.RESULTS： The expressions of EGFR, PCNA and procollagen I were significantly reduced in the patients treated with gefitinib in 12 weeks compared with those in the control group. Patients in the gefitinib group had a much lower degree of hyperplasia of the biliary epithelium, submucosal glands and collagen fibers compared with those in the control group. Gefitinib treatment significantly decreased mucin 3 expression and β-glucuronidase activity.CONCLUSION： Postoperative gefitinib treatment could significantly inhibit PC-mediated hyperplasia and lithogenesis, which might provide a novel strategy for the prevention of biliary restenosis and stone recurrence in patients with hepatolithiasis.

Platelet derived growth factor and basic fibroblast growth factor immunolocalized in proliferative retinal diseases

Objective To study the role of platelet derived growth factor (PDGF) and basic fibroblast growth factor (bFGF) in the development of proliferative vitreoretinopathy (PVR) Methods Immunohistochemical localization was performed on frozen sections of the epiretinal or subretinal membranes from 21 PVR patients using!monoclonal antibodies against PDGF and bFGF and the streptavidin peroxidase system Results PDGF was expressed in 15 of 21 specimens (71 4%), and bFGF was expressed in 14 specimens (66 7%) Different cell density was seen in different types of epiretinal membranes The cell density of vascular membranes induced by PDR and Eales disease was the highest (≥61 cells/field, ×1000); nonvascular membranes induced by PVR or traumatic PVR had moderate cell density (31-60 cells/field); and the macular membrane had the lowest cell density (≤30 cells/field) Conclusion The presents of PDGF and bFGF in PVR tissues suggest that PDGF and bFGF may play an important role in the development of PVR