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Engineering of PEDF-Expressing Primary Pigment Epithelial Cells by the SB
Transposon System Delivered by pFAR4 Plasmids
#MMPMID28325297
Thumann G
; Harmening N
; Prat-Souteyrand C
; Marie C
; Pastor M
; Sebe A
; Miskey C
; Hurst LD
; Diarra S
; Kropp M
; Walter P
; Scherman D
; Ivics Z
; Izsvák Z
; Johnen S
Mol Ther Nucleic Acids
2017[Mar]; 6
(?): 302-314
PMID28325297
show ga
Neovascular age-related macular degeneration (nvAMD) is characterized by
choroidal blood vessels growing into the subretinal space, leading to retinal
pigment epithelial (RPE) cell degeneration and vision loss. Vessel growth results
from an imbalance of pro-angiogenic (e.g., vascular endothelial growth factor
[VEGF]) and anti-angiogenic factors (e.g., pigment epithelium-derived factor
[PEDF]). Current treatment using intravitreal injections of anti-VEGF antibodies
improves vision in about 30% of patients but may be accompanied by side effects
and non-compliance. To avoid the difficulties posed by frequent intravitreal
injections, we have proposed the transplantation of pigment epithelial cells
modified to overexpress human PEDF. Stable transgene integration and expression
is ensured by the hyperactive Sleeping Beauty transposon system delivered by
pFAR4 miniplasmids, which have a backbone free of antibiotic resistance markers.
We demonstrated efficient expression of the PEDF gene and an optimized PEDF cDNA
sequence in as few as 5 × 10(3) primary cells. At 3 weeks post-transfection, PEDF
secretion was significantly elevated and long-term follow-up indicated a more
stable secretion by cells transfected with the optimized PEDF transgene. Analysis
of transgene insertion sites in human RPE cells showed an almost random genomic
distribution. The results represent an important contribution toward a clinical
trial aiming at a non-viral gene therapy of nvAMD.