Published ahead of print on June 15, 2007, doi:10.1165/rcmb.2006-0276OC Am. J. Respir. Cell Mol. Biol., Volume 37, Number 4, October 2007, 414-423 A more recent version of this article appeared on October 1, 2007
Submitted on July 28, 2006 Development of Lentiviral Vectors with Regulated Respiratory Epithelial Expression In VivoBenjamin Hendrickson1,1 Department of Pediatrics, University of Southern California, Keck School of Medicine, The Saban Research Institute at Childrens Hospital Los Angeles, Division of Research Immunology and Bone Marrow Transplantation, Los Angeles, CA, USA, 2 Department of Neonatology, University of California, Los Angeles, Geffen School of Medicine, Los Angeles, CA, USA * To whom correspondence should be addressed. E-mail: clutzko{at}chla.usc.edu.
Development of gene transfer vectors with regulated, lung specific expression will be a useful tool for studying lung biology and developing gene therapies. In this study we constructed a series of lentiviral vectors with regulatory elements predicted to produce lung specific transgene expression: the surfactant protein C promoter (SPC) for alveolar epithelial type II cell (AECII) expression, the Clara cell 10kd protein (CC10) for Clara cell expression in the airway, and the Jaagskiete sheep retrovirus (JSRV) promoter for expression in both cell types. Transgene expression from the SPC and CC10 vectors was restricted to AECII and Clara cell lines respectively, while expression from the JSRV vector was observed in multiple respiratory and non-respiratory cell types. Following intra-tracheal delivery of lentivector supernatant to mice, transgene expression was observed in AECII from the SPC lentivector, and in Clara cells from the CC10 promoted lentivector. Transgene expression was not detected in non-respiratory tissues following intravenous delivery of CC10 and SPC lentiviral vectors to murine recipients. In summary, incorporation of genomic regulatory elements from the SPC and CC10 genes resulted in respiratory specific transgene expression in vitro and in vivo. These vectors will provide a useful tool for the study of lung biology and the development of gene therapies for lung disorders.
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