Development of real-time fluorescent quantitative PCR method for detecting Bombyx mori cytoplasmic polyhedrosis virus / 病毒学报

A pair of specific primers were designed according to the published 118 bp conserved sequence of polyhedrin gene of Bombyx mori cytoplasmic polyhedrosis virus (BmCPV) in GenBank and a serial dilutions of a recombinant plasmid were prepared and used to generate standard curves, to establish a real-time fluorescent quantitative PCR method for detection of BmCPV. The results showed that the linear relationship between virus concentration (X) and Ct (Y) was Y = -3. 582 lgX + 38.748 with the correlation coefficient R2 = 0999. The method was very sensitive, specific and reproducible. It can be applied in the rapid detection of BmCPV and the prevalence investigation of this disease.

Expression of human interleukin-11 in cell culture and larvae of silkworm / 生物工程学报

A recombinant transfer vector, pBacIL-11, containing hIL-11 cDNA of 546 nucleotides lacking leader sequence was constructed and co-transfected into BmN cells with linearized BmBacPAK(modified BmNPV) DNA for construction of a recombinant baculovirus carrying the hIL-11 gene. Southern hybridization analysis suggested that the recombinant baculovirus DNA contained hIL-11 cDNA fragment. RNA dot blotting demonstrated that the hIL-11 gene was transcribed. The recombinant baculovirus has a strong infectivity to BmN cell line and to silkworm larvae and pupae. Specific hIL-11 bands were detected from all the samples of cell extract, culture supernatant, haemolymph of larvae and pupae by SDS-PAGE analysis. Biological activity of the expressed product was determined with IL-11 dependent B9-11 cell line and by MTT colorimetric assay, which indicated that biologically active rhIL-11 protein was overexpressed in BmN cell line and in silkworm larvae and pupae.