Lumbrukinase gene from earthworm ( *** ) was obtained by RT\|PCR. The product, PI 239 , was sequenced and analyzed by biology programs and database. The gene including signal peptide coding sequence was cloned into an...
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Lumbrukinase gene from earthworm ( *** ) was obtained by RT\|PCR. The product, PI 239 , was sequenced and analyzed by biology programs and database. The gene including signal peptide coding sequence was cloned into an eukaryotic vector and the clones were obtained by transferring into BHK cells. The gene was fused with EGFP gene at C\|terminal to be detected conveniently by its fluorescence. The lumbrukinase gene PI 239 has 852 nucleotides that code for 239 amino acid residues as mature peptide chain. The N terminal of PI 239 shares certain homology with those known lumbrukinase. The enzyme contains relative more acidic amino acid residues, and has homology to serine protease. It belongs to the acidic protein, serine protease. Conformation prediction indicates that its secondary structure mainly consists of β sheet. It has two super secondary structure motifs with the active sites Asp188 and Ser189 in between. The DNA and mRNA of the whole gene could be detected in BHK clones, but no recombinant protein detected. Under cofocal microscope, the cells transferred with fused gene showed fluorescence indicating that the fused protein was expressed. In addition, the cells containing the fused gene died soon while most of the control cells were still alive. It seemed that the protein could be expressed in BHK cells as a cytotoxin, though at a low level.
OBJECTIVE: To verify whether the extracellular domain of kinase domain region (KDR) has anti-angiogenesis activity in vivo. METHODS: cDNA was cloned into adeno-associated virus (AAV) vector pSNAV and transfected to ba...
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OBJECTIVE: To verify whether the extracellular domain of kinase domain region (KDR) has anti-angiogenesis activity in vivo. METHODS: cDNA was cloned into adeno-associated virus (AAV) vector pSNAV and transfected to baby hamster kidney (BHK) cells. Recombinant AAV was obtained from the cell culture supernatant after adding helper virus. Recombinant AAV-infected human bladder cancer EJ cell line (EJ cells) were injected subcutaneously into Balb-c nude mice. Tumor specimens were removed from the mice, paraffin-embedded and sliced, then stained by immunohistochemistry. Microvessel density (MVD) was determined under a microscope. RESULTS: The tumor volume developed by EJ cells transfected with the extracellular domain of KDR was significantly smaller (1.70 +/- 0.18 cm(3)) compared with that in the control (5.62 +/- 0.67 cm(3)) (P
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