Dong Zhou1, Jie Yang, Wei-Dong Huang, Jun Wang, Qiang Zhang. 1. Dong Zhou, Jie Yang, Wei-Dong Huang, Jun Wang, Qiang Zhang, Department of General Surgery, Xiangyang Hospital Affiliated to Hubei University of Medicine, Xiangyang 441000, Hubei Province, China.
Abstract
AIM: To determine the effects of RNAi-mediated inhibition of the growth hormone receptor (GHR) gene on tumors and colon cancer cells in vivo. METHODS: Construction of a eukaryotic vector for human GHR expression, the pcDNA6.2-GW/EmGFP-small interfering RNAs (siRNAs)-GHR plasmid, was used to inhibit GHR expression. Thirty-six BALB/c nude mice were randomly divided into groups and treated with normal saline (NS), recombinant plasmid (G₂), growth hormone (GH), 5-fluorouracil (FU), G₂+FU or G₂+FU+GH. Each nude mouse was subcutaneously inoculated with 1 × 10(7) human colon cancer SW480 cells; the nude mice were weighed before inoculation and on the 2(nd), 5(th), 8(th), 11(th), 14(th) and 17(th) day after inoculation. All nude mice were sacrificed after 17 d. Each subcutaneous tumor was removed and studied. Tumor volume was measured on the 5(th), 8(th), 11(th), 14(th) and 17(th) day after inoculation. The expression of GHR protein in the tumor tissue was detected by Western blotting analysis, and the differences in GHR mRNA expression in the tumor tissue were detected by real-time quantitative reverse transcription-polymerase chain reaction. RESULTS: Compared to the control group, the weights of the inoculated nude mice on the 17(th) day after inoculation were: G₂: 21.60 ± 0.71 g, GH: 21.64 ± 0.45 g, FU: 18.94 ± 0.47 g, FU+G₂: 19.40 ± 0.60 g, G₂+FU+GH: 21.04 ± 0.78 g vs NS: 20.68 ± 0.66 g, P < 0.05; the tumor volumes after the subcutaneous inoculation were: G₂: 9.71 ± 3.82 mm(3), FU: 11.54 ± 2.42 mm(3), FU+G₂: 11.42 ± 1.11 mm(3), G₂+FU+GH: 10.47 ± 1.02 mm(3) vs NS: 116.81 ± 10.61 mm(3), P < 0.05. Compared to the GH group, the tumor volumes were significantly decreased in the experimental groups. The GHR protein expression (G₂: 0.39 ± 0.02, FU: 0.40 ± 0.02, FU+G₂: 0.38 ± 0.01, G₂+FU+GH: 0.39 ± 0.01 vs NS: 0.94 ± 0.02, P < 0.05) and the GHR mRNA expression (G₂: 14.12 ± 0.10, FU: 15.15 ± 0.44, FU+G₂: 16.46 ± 0.27, G₂+FU+GH: 15.37 ± 0.57 vs NS: 12.63 ± 0.14, P < 0.05) were significantly decreased and increased, respectively, in the experimental groups. CONCLUSION: Inhibition of GHR in human colon cancer SW480 cells resulted in anti-tumor effects in nude mice.
AIM: To determine the effects of RNAi-mediated inhibition of the growth hormone receptor (GHR) gene on tumors and colon cancer cells in vivo. METHODS: Construction of a eukaryotic vector for humanGHR expression, the pcDNA6.2-GW/EmGFP-small interfering RNAs (siRNAs)-GHR plasmid, was used to inhibit GHR expression. Thirty-six BALB/c nude mice were randomly divided into groups and treated with normal saline (NS), recombinant plasmid (G₂), growth hormone (GH), 5-fluorouracil (FU), G₂+FU or G₂+FU+GH. Each nude mouse was subcutaneously inoculated with 1 × 10(7) humancolon cancer SW480 cells; the nude mice were weighed before inoculation and on the 2(nd), 5(th), 8(th), 11(th), 14(th) and 17(th) day after inoculation. All nude mice were sacrificed after 17 d. Each subcutaneous tumor was removed and studied. Tumor volume was measured on the 5(th), 8(th), 11(th), 14(th) and 17(th) day after inoculation. The expression of GHR protein in the tumor tissue was detected by Western blotting analysis, and the differences in GHR mRNA expression in the tumor tissue were detected by real-time quantitative reverse transcription-polymerase chain reaction. RESULTS: Compared to the control group, the weights of the inoculated nude mice on the 17(th) day after inoculation were: G₂: 21.60 ± 0.71 g, GH: 21.64 ± 0.45 g, FU: 18.94 ± 0.47 g, FU+G₂: 19.40 ± 0.60 g, G₂+FU+GH: 21.04 ± 0.78 g vs NS: 20.68 ± 0.66 g, P < 0.05; the tumor volumes after the subcutaneous inoculation were: G₂: 9.71 ± 3.82 mm(3), FU: 11.54 ± 2.42 mm(3), FU+G₂: 11.42 ± 1.11 mm(3), G₂+FU+GH: 10.47 ± 1.02 mm(3) vs NS: 116.81 ± 10.61 mm(3), P < 0.05. Compared to the GH group, the tumor volumes were significantly decreased in the experimental groups. The GHR protein expression (G₂: 0.39 ± 0.02, FU: 0.40 ± 0.02, FU+G₂: 0.38 ± 0.01, G₂+FU+GH: 0.39 ± 0.01 vs NS: 0.94 ± 0.02, P < 0.05) and the GHR mRNA expression (G₂: 14.12 ± 0.10, FU: 15.15 ± 0.44, FU+G₂: 16.46 ± 0.27, G₂+FU+GH: 15.37 ± 0.57 vs NS: 12.63 ± 0.14, P < 0.05) were significantly decreased and increased, respectively, in the experimental groups. CONCLUSION: Inhibition of GHR in humancolon cancer SW480 cells resulted in anti-tumor effects in nude mice.
Authors: Sébastien Jeay; Gail E Sonenshein; Marie Catherine Postel-Vinay; Paul A Kelly; Elena Baixeras Journal: Mol Cell Endocrinol Date: 2002-02-25 Impact factor: 4.102
Authors: Niels Reinmuth; Fan Fan; Wenbiao Liu; Alexander A Parikh; Oliver Stoeltzing; Young D Jung; Corazon D Bucana; Robert Radinsky; Gary E Gallick; Lee M Ellis Journal: Lab Invest Date: 2002-10 Impact factor: 5.662
Authors: Vera Chesnokova; Svetlana Zonis; Cuiqi Zhou; Maria Victoria Recouvreux; Anat Ben-Shlomo; Takako Araki; Robert Barrett; Michael Workman; Kolja Wawrowsky; Vladimir A Ljubimov; Magdalena Uhart; Shlomo Melmed Journal: Proc Natl Acad Sci U S A Date: 2016-05-25 Impact factor: 11.205