Biological effects of eukaryotic recombinant plasmid pReceiver-M61-BAI-1 transfection on T24 cells and HUVECs

Abstract

The aim of the current study was to investigate the biological effect on T24 cells and human umbilical vein endothelial cells (HUVECs) of transfection with brain-specific angiogenesis inhibitor-1 (BAI-1). The recombinant plasmid pReceiver-M61-BAI-1 was transfected into human superficial bladder tumor cells (T24) and HUVECs, in parallel with the vector control. mRNA and protein expression levels of BAI-1 were then detected by quantitative polymerase chain reaction (qPCR) and western blotting, respectively. Cell apoptosis of T24 cells and HUVECs prior and subsequent to transfection with BAI-1 was analyzed by flow cytometric analysis. Proliferation of T24 cells and HUVECs prior and subsequent to transfection of BAI-1 was assessed by the MTT method. T24 cells and HUVECs transfected with pReceiver-M61-BA1-1 were classed as the experimental group; T24 cells and HUVECs transfected with p-Receiver-M61 were the control group. qPCR and western blotting methods confirmed that there was positive expression of BAI-1 in T24 cells and HUVECs transfected with pReceiver-M61-BAI-1, however BAI-1 was not expressed in T24 cells and HUVECs transfected with pReceiver-M61. The results of the MTT assay demonstrated that absorbance was markedly reduced in HUVECs at 12, 48 and 72 h subsequent to transfection with pReceiver-M61-BAI-1 when compared with that of the control group and in T24 cells transfected with p-Receiver-M61-BAI-1. Furthermore, flow cytometry results also indicated that the apoptotic rate of HUVECs transfected with p-Receiver-M61-BAI-1 was significantly increased compared with that of the control group and T24 cells transfected with p-Receiver-M61-BAI-1. BAI-1 was observed to markedly inhibit the proliferation of vascular endothelial cells in vitro, however, no direct inhibition by BAI-1 was observed in T24 cells. In conclusion, BAI-1 is suggested to be a potential novel therapautic target for the inhibition of tumor neovascularization.

Therapeutic Application of Brain-Specific Angiogenesis Inhibitor 1 for Cancer Therapy

“…Decreased expression of BAI1 in these tissues has been correlated to increased tumor growth and vascularization. Though the exact relationship and mechanism between BAI1 and angiogenesis is unknown, one study showed that overexpression of BAI1 in vascular endothelial cells resulted in increased apoptosis [ 9 ], and the BAI-mediated inhibition of angiogenesis has been shown to occur following the interaction of its TSR domain with either CD36 scavenger receptors [ 10 ] or α v β 5 integrin receptors [ 11 ] on endothelial cells. BAI1 is a transmembrane protein and a member of the adhesion G protein-coupled receptor (GPCR) family [ 12 ].…”

“…While angiogenesis is known to play an important role in tumorigenesis, and BAI1 expression is downregulated in certain cancer types [ 3 ], the precise mechanisms of BAI1-mediated anti-angiogenesis is still being elucidated. One study showed that overexpression of BAI1 in vascular endothelial cells resulted in increased apoptosis [ 9 ], and the BAI-mediated inhibition of angiogenesis has been shown to occur following the interaction of its TSR domain with either CD36 scavenger receptors [ 10 ] or α v β 5 integrin receptors [ 11 ] on endothelial cells. As evidence for the latter scenario, BAI1 overexpression reduced the survival of human umbilical vein endothelial cells (HUVECs) by 51%.…”