Partial correction of endogenous DeltaF508 CFTR in human cystic fibrosis airway epithelia by spliceosome-mediated RNA trans-splicing.
Spliceosome-mediated RNA trans-splicing (SMaRT) was investigated as a means for functionally correcting endogenous DeltaF508 cystic fibrosis transmembrane conductance regulator (CFTR) transcripts using in vitro human cystic fibrosis (CF) polarized airway epithelia and in vivo human CF bronchial xenografts. Recombinant adenovirus (Ad.CFTR-PTM) encoding a pre-therapeutic molecule (PTM) targeted to CFTR intron 9 corrected transepithelial cyclic AMP (cAMP)-sensitive short-circuit current (Isc) in DeltaF508 homozygous epithelia to a level 16% of that observed in normal human bronchial epithelia. Molecular analyses using RT-PCR and western blotting confirmed SMaRT-mediated partial correction of endogenous DeltaF508 messenger RNA (mRNA) transcripts and protein. In an in vivo model of DeltaF508 CF airway epithelia, human CF bronchial xenografts infected with Ad.CFTR-PTM also demonstrated partial correction of CFTR-mediated Cl- permeability at a level 22% of that seen in non-CF xenografts. These results provide functional evidence for SMaRT-mediated repair of mutant endogenous CFTR mRNA in intact polarized CF airway epithelial models.
Liu
Xiaoming
X
Department of Anatomy and Cell Biology, College of Medicine, The University of Iowa, Iowa City, IA 52242, USA.
Jiang
Qinshi
Q
Mansfield
S Gary
SG
Puttaraju
M
M
Zhang
Yulong
Y
Zhou
Weihong
W
Cohn
Jonathan A
JA
Garcia-Blanco
Mariano A
MA
Mitchell
Lloyd G
LG
Engelhardt
John F
JF
D000256:Adenoviridae / Q000235:genetics; D000483:Alleles; D001483:Base Sequence; D015139:Blotting, Southern; D001980:Bronchi / Q000378:metabolism / Q000473:pathology*; D003550:Cystic Fibrosis / Q000235:genetics* / Q000628:therapy*; D019005:Cystic Fibrosis Transmembrane Conductance Regulator / Q000235:genetics*; D004847:Epithelial Cells / Q000378:metabolism; D006367:HeLa Cells; D006801:Humans; D015151:Immunoblotting; D008957:Models, Genetic; D008969:Molecular Sequence Data; D009154:Mutation; D012326:RNA Splicing; D012333:RNA, Messenger / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D017381:Spliceosomes / Q000235:genetics*
C505032:CFTR protein, human; D012333:RNA, Messenger; D019005:Cystic Fibrosis Transmembrane Conductance Regulator