Objective(s): Polyethylenimine (PEI) is one of the most widely used polymers in gene delivery. The aim of this study was to modify PEI by replacing some of its primary amines with Brevinin 2R (BR-2R) peptide in order to increase the efficiency of gene delivery.Materials and Methods: Polyethylenimine was modified by BR-2R peptide by two d...

Background: HLA-G is a nonclassical HLA class I molecule which, when elevated in tumor cells, is one of the main factors involved in tumor evasion of immune responses including NK and T cells. Objective: To evaluate the effect of HLA-G downregulation on NK cell cytotoxicity in tumor cell lines. Methods: The expression level of HLA-G was measured by real-time PCR and flowcytometry after transfec...

background: the magnetic nanoparticle-based transfection method is a relatively new technique for delivery of functional genes to target tissues. we aimed to evaluate the transfection efficiency of rat neural stem cell (nsc) using poly-l-lysine hydrobromide (pll)-coated super paramagnetic iron oxide nanoparticles (spion). methods: the spion was prepared and coated with pll as transfection agent...

An endosomal trap is a major barrier in gene therapy. We have designed an endosomolytic peptide based on the leucine zipper sequence and characterized it both structurally functionally. The results illustrated that (LZEP) exhibited appreciable hemolysis of human red blood cells (hRBCs) at pH 5.0, but negligible 7.4. Calcein release experiment indicated only 5.0 not 7.4, LZEP was able to permeab...

This study was conducted to optimize a highly efficient mRNA transfection into dendritic cells (DC) derived from esophageal squamous cell carcinoma (ESCC) patients. Applying an electroporation technique, in vitro synthesized Green Fluorescent Protein (GFP) mRNA was transfected as an indicator into the DCs derived from a healthy donor. Flow cytometry revealed 84.9% transfection efficiency for DC...

Total protein and DNA extracted from histologically diagnosed normal nonmalignant and esophageal tumor tissues were used for analysis of polypeptides pattern by two-dimensional gel electrophoresis and DNA transforming activity in NIH 3T3 cell transfection assay, respectively. In comparison to normal tissues, eight polypeptides underwent down-regulation or disappeared, while seven polypeptid...

Radiotherapy plays an important role in the treatment of hepatocellular carcinoma (HCC). Cyclin G1 is a novel member cyclin family, and it abnormally expressed HCC. In this study we investigated radiotherapy HCC cells. The expression was silenced by transfection G1-siRNA into HepG2 cells Huh7 cells, mRNA protein measured qRT-PCR Western blot analysis. proliferation analyzed using MTT assay, rad...