Mesenchymal stem cell (MSC) mediated gene therapy research has been conducted predominantly on rodents. Appropriate large animal models may provide additional safety and efficacy information prior to human clinical trials. The objectives of this study were: (a) to optimize adenoviral transduction efficiency of porcine bone marrow MSCs using a commercial
polyamine-based transfection
reagent (
GeneJammer, Stratagene, La Jolla, CA), and (b) to determine whether transduced MSCs retain the ability to differentiate into mesodermal lineages. Porcine MSCs (pMSCs) were infected under varying conditions, with replication-defective adenoviral vectors carrying the GFP gene and GFP expression analyzed. Transduced cells were induced to differentiate in vitro into adipogenic, chondrogenic, and osteogenic lineages. We observed a 5.5-fold increase in the percentage of GFP-expressing pMSCs when adenovirus type 5 carrying the adenovirus type 35 fiber (Ad5F35eGFP) was used in conjunction with
GeneJammer. Transduction of pMSCs at 10.3-13.8 MOI (1,500-2,000 vp/cell) in the presence of Gene Jammer yielded the highest percentage of GFP-expressing cells ( approximately 90%) without affecting cell viability. A similar positive effect was detected when pMSCs were infected with an Ad5eGFP vector. Presence of
fetal bovine serum (FBS) during adenoviral transduction enhanced vector-encoded transgene expression in both
GeneJammer-treated and control groups. pMSCs transduced with adenovirus vector in the presence of
GeneJammer underwent lipogenic, chondrogenic, and osteogenic differentiation. Addition of
GeneJammer during adenoviral
infection of pMSCs can revert the poor transduction efficiency of pMSCs while retaining their pluripotent differentiation capacity.
GeneJammer-enhanced transduction will facilitate the use of adenoviral vectors in MSC-mediated gene therapy models and
therapies.