Baculovirus ETL promoter acts as a shuttle promoter between insect cells and mammalian cells.
OBJECTIVE
To identify a shuttle promoter that can mediate gene expression in both insect cells and mammalian cells to facilitate the development of a baculovirus vector-based mammalian cell gene delivery vehicle.


METHODS
Recombinant baculoviruses carrying the beta-galactosidase reporter gene under the control of an early to late (ETL) promoter of the Autographa californica multiple nuclear polyhedrosis virus (AcMNPV) or a cytomegalovirus immediate early promoter (CMV promoter) were constructed. COS1, HeLa, CHO-K1, hFob1.19, and MCF-7 mammalian cells were tested for the expression of b-galactosidase.


RESULTS
ETL promoter activity was higher in bone-derived hFob1.19 than in COS1, HeLa, CHO-K1, or MCF-7 mammalian cells. The transient plasmid transfection assay indicated that ETL promoter activity in mammalian cells was dependent on baculovirus gene expression.


CONCLUSIONS
ETL promoter activity in mammalian cells is baculovirus gene expression-dependent, and the shuttle promoter will facilitate the application of baculovirus expression vectors in mammalian cell expression systems and for gene therapy.
Liu
Yu-kou
YK
Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan, Taiwan, China.
Chu
Chih-chieh
CC
Wu
Tzong-yuan
TY
D000818:Animals; D016367:Baculoviridae / Q000235:genetics*; D016466:CHO Cells; D019556:COS Cells; D045744:Cell Line, Tumor; D002522:Chlorocebus aethiops; D006224:Cricetinae; D003412:Cricetulus; D003587:Cytomegalovirus / Q000235:genetics; D017781:Genes, Immediate-Early; D017930:Genes, Reporter; D005822:Genetic Vectors; D006801:Humans; D007304:Insect Viruses / Q000235:genetics*; D011401:Promoter Regions, Genetic; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism; D014162:Transfection; D001616:beta-Galactosidase / Q000096:biosynthesis* / Q000235:genetics
D011994:Recombinant Proteins; D001616:beta-Galactosidase