CELLULAR REPROGRAMMING TO REVERSE AGING AND PROMOTE ORGAN AND TISSUE REGENERATION

Smart overview of the Invention

Engineered nucleic acids and recombinant viruses encoding specific transcription factors, such as OCT4, KLF4, and SOX2, are designed to facilitate cellular reprogramming, tissue repair, and regeneration. These components can reverse aging effects and help in organ regeneration. The technology employs various viral vectors, including lentiviral and adenoviral vectors, to deliver these nucleic acids into cells effectively. The approach also includes engineered proteins and antibodies that activate the expression of these transcription factors, offering potential treatments for diseases and cellular rejuvenation.

Background

The ability of mature somatic cells to regenerate and repair is limited, especially as organisms age. Unlike embryonic cells, which are more resilient and capable of regeneration, adult somatic cells often fail to self-renew after damage. Aging is increasingly attributed to epigenetic changes rather than genetic mutations, with the loss of epigenetic information leading to improper gene expression. This misregulation contributes to aging-related diseases and cellular senescence. The Yamanaka factors, including OCT4, SOX2, KLF4, and c-Myc, have been shown to induce pluripotency but can also cause adverse effects like teratomas when used in vivo.

Innovative Approach

The invention focuses on rejuvenating cells by restoring lost epigenetic information without complete reprogramming to a pluripotent state. By expressing OCT4, SOX2, and KLF4, the methods aim to reverse aging markers and promote cellular youthfulness, while avoiding the expression of c-Myc to prevent toxicity. This approach allows for partial reprogramming, retaining cellular identity and integrity, which is crucial for tissue and organ function. The expression of these factors has been shown to aid regeneration in both young and old mice, as well as in human neurons.

Mechanisms and Effects

The methods aim to restore cellular identity by modulating epigenetic marks and protein expression. Key processes include increasing histone abundance, adjusting heterochromatin and euchromatin marks, and altering DNA methylation at age-related sites. These changes help maintain a youthful cellular environment, decrease aging-related proteins, and promote tissue regeneration. The controlled expression of OCT4, SOX2, and KLF4 helps restore the balance between different chromatin states, thereby rejuvenating cells without inducing pluripotency.

Applications and Implications

The technology offers a promising avenue for reversing aging and treating diseases through precise control of transcription factor expression. The expression vectors and viral incorporation allow for targeted delivery and high efficiency in vivo. This approach shows potential in treating ocular diseases and promoting tissue regeneration, such as optic nerve repair, without the risks associated with complete cellular reprogramming. The insights gained from this research could lead to novel therapies for age-related conditions and improve regenerative medicine practices.