Rabbit Anti-Human FN1 Polyclonal antibody

BackgroundEndometriosis, characterized by the presence of functional endometrial tissues outside the uterus, is one of the most common gynecological disorders. Endometrial mesenchymal stem cells (MSCs) are crucial for the occurrence and development of endometriosis. Ectopic endometrial MSCs exist in the peritoneal cavity. Thus, the bioactive factors in endometriotic peritoneal fluid may regulate the biological behaviors of endometrial MSCs.MethodsIn this study, after assessing the concentration of Activin A in peritoneal fluid using ELISA, we isolated and cultured endometrial MSCs and investigated whether Activin A stimulated endometrial MSCs to differentiate into myofibroblasts and clarified the underlying mechanisms by quantitative real-time PCR, Western blot analysis, immunofluorescent staining, RNA interference and Chromatin immunoprecipitation. We also employed the inhibitors of Activin A to explore the possibility of suppressing the development of fibrosis in endometriosis using primary endometrial MSCs cultures and a mouse model of endometriosis.ResultsHere, we revealed that Activin A significantly elevated in endometriotic peritoneal fluid and activin receptor-like kinase (ALK4), the specific receptor for Activin A, obviously enhanced in ectopic endometrial MSCs compared with eutopic endometrial MSCs from women with or without endometriosis. Next, we found that Activin A drived myofibroblast differentiation of endometrial MSCs, with extremely enhanced expression of connective tissue growth factor (CTGF). CTGF was shown to be required for Activin A-induced expression of ACTA2, COL1A1 and FN1 in endometrial MSCs. CTGF induction by Activin A in endometrial MSCs involved the activation of Smad2/3, as evidenced by the phosphorylation and nuclear translocation of Smad2/3 as well as the binding of Smad2/3 to CTGF promoter. Furthermore, Smad/CTGF pathway in endometrial MSCs required activation of STAT3 while independent of PI3K, JNK and p-38 pathways. In addition, we also demonstrated that inhibition of Activin A pathway impeded myofibroblast differentiation of endometrial MSCs and ameliorated fibrosis in endometriosis mice.ConclusionsActivin A promotes myofibroblast differentiation of endometrial mesenchymal stem cells via STAT3-dependent Smad/CTGF pathway. The results provided the first evidence that STAT3 acted as a crucial Activin A downstream mediator to regulate CTGF production. Our data may supplement the stem cell theory of endometriosis and provide the experimental basis to treat endometriosis-associated fibrosis by manipulating Activin A signaling.

Considering the resistance of papillary thyroid cancer (PTC) I-131 therapy, this study was designed to find a solution at molecular respect. By probing into lncRNA-NEAT1/miR-101-3p/FN1 axis and PI3K/AKT signaling pathway, this study provided a potential target for PTC therapy. I-131-resistant cell lines were established by continuous treatment with median-lethal I-131. Bioinformatic analysis was applied to filtrate possible lncRNA/miRNA/mRNA and related signaling pathway. Luciferase reporter assay was employed in the verification of the targeting relationship between lncRNA and miRNA as well as miRNA and mRNA. MTT assay and flow cytometry assay were performed to observe the impact of NEAT1/miR-101-3p/FN1 on cell viability and apoptosis in radioactivity iodine (RAI)-resistant PTC cell lines, respectively. Western blot and qRT-PCR were conducted to measure the expression of proteins and mRNAs in RAI-resistant PTC tissues and cells. Meanwhile, endogenous PTC mice model were constructed, in order to verify the relation between NEAT1 and RAI-resistance in vivo. NEAT1 was over-expressed in RAI-resistant PTC tissues and cell lines and could resist RAI by accelerating proliferation accompanied by suppressing apoptosis. It indicated that overexpressed NEAT1 restrained the damage of RAI to tumor in both macroscopic and microcosmic. Besides, NEAT1/miR-101-3p exhibited a negative correlation by directly targeting each other. The expression of FN1, an overexpressed downstream protein in RAI-resistance PTC tissues, could be tuned down by miR-101-3p, while the decrease could be restored by NEAT1. In conclusion, both in vitro and in vivo, NEAT1 suppression could inhibit I-131 resistance of PTC by upregulating miR-101-3p/FN1 expression and inactivated PI3K/AKT signaling pathway both in vitro and in vivo.