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AAVvector-mediated in vivo reprogramming into pluripotency.

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Researchers developed Adeno-associated virus (AAV) vectors for in vivo reprogramming of somatic cells into induced pluripotent stem cells (iPSC). This breakthrough enables efficient reprogramming in adult mice without c-Myc, advancing regenerative medicine.

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Area of Science:

  • * Molecular Biology
  • * Stem Cell Biology
  • * Gene Therapy

Background:

  • * In vivo reprogramming of somatic cells to induced pluripotent stem cells (iPSC) is crucial for regenerative medicine and basic research.
  • * Current methods require efficient delivery vectors for reprogramming factors (Oct-3/4, Klf4, Sox2, c-Myc; OKSM) to target organs.

Purpose of the Study:

  • * To develop Adeno-associated virus (AAV) based vectors for efficient in vivo delivery of reprogramming factors.
  • * To investigate the feasibility of reprogramming somatic cells in adult mice using AAV vectors.
  • * To explore in vivo reprogramming without the c-Myc oncogene.

Main Methods:

  • * Construction and utilization of pseudotyped AAV vectors carrying the OKSM reprogramming factors.
  • * Testing AAV-DJ for reprogramming mouse embryonic fibroblasts in vitro.
  • * Employing AAV8 for intravenous delivery and in vivo reprogramming in adult mice.

Main Results:

  • * AAV-DJ vectors efficiently reprogrammed fibroblasts at low doses in vitro.
  • * AAV8 enabled efficient in vivo reprogramming of somatic cells in adult mice via intravenous delivery, confirmed by teratomas and circulating iPSCs.
  • * Successful in vivo reprogramming was achieved without the need for c-Myc.
  • * Generated iPSCs (in vitro and in vivo) exhibited transcriptionally silent, non-disruptive vector integrations.

Conclusions:

  • * The developed AAV vectors represent a significant advancement for in vivo reprogramming technology.
  • * This approach facilitates the study of reprogramming mechanisms and the consequences of AAV vector persistence in vivo.
  • * The ability to reprogram without c-Myc enhances the safety profile for potential therapeutic applications.