Abstract:
:Clinical application of lentiviral vector (LV)-based hematopoietic stem and progenitor cells (HSPC) gene therapy is rapidly becoming a reality. Nevertheless, LV-mediated signaling and its potential functional consequences on HSPC biology remain poorly understood. We unravel here a remarkably limited impact of LV on the HSPC transcriptional landscape. LV escaped innate immune sensing that instead led to robust IFN responses upon transduction with a gamma-retroviral vector. However, reverse-transcribed LV DNA did trigger p53 signaling, activated also by non-integrating Adeno-associated vector, ultimately leading to lower cell recovery ex vivo and engraftment in vivo These effects were more pronounced in the short-term repopulating cells while long-term HSC frequencies remained unaffected. Blocking LV-induced signaling partially rescued both apoptosis and engraftment, highlighting a novel strategy to further dampen the impact of ex vivo gene transfer on HSPC. Overall, our results shed light on viral vector sensing in HSPC and provide critical insight for the development of more stealth gene therapy strategies.
journal_name
EMBO Mol Medjournal_title
EMBO molecular medicineauthors
Piras F,Riba M,Petrillo C,Lazarevic D,Cuccovillo I,Bartolaccini S,Stupka E,Gentner B,Cittaro D,Naldini L,Kajaste-Rudnitski Adoi
10.15252/emmm.201707922subject
Has Abstractpub_date
2017-09-01 00:00:00pages
1198-1211issue
9eissn
1757-4676issn
1757-4684pii
emmm.201707922journal_volume
9pub_type
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