Utility of telomerase-pot1 fusion protein in vascular tissue engineering.
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While advances in regenerative medicine and vascular tissue engineering have been substantial in recent years, important stumbling blocks remain. In particular, the limited life span of differentiated cells that are harvested from elderly human donors is an important limitation in many areas of regenerative medicine. Recently, a mutant of the human telomerase reverse transcriptase enzyme (TERT) was described, which is highly processive and elongates telomeres more rapidly than conventional telomerase. This mutant, called pot1-TERT, is a chimeric fusion between the DNA binding protein pot1 and TERT. Because pot1-TERT is highly processive, it is possible that transient delivery of this transgene to cells that are utilized in regenerative medicine applications may elongate telomeres and extend cellular life span while avoiding risks that are associated with retroviral or lentiviral vectors. In the present study, adenoviral delivery of pot1-TERT resulted in transient reconstitution of telomerase activity in human smooth muscle cells, as demonstrated by telomeric repeat amplification protocol (TRAP). In addition, human engineered vessels that were cultured using pot1-TERT-expressing cells had greater collagen content and somewhat better performance in vivo than control grafts. Hence, transient delivery of pot1-TERT to elderly human cells may be useful for increasing cellular life span and improving the functional characteristics of resultant tissue-engineered constructs.
Cell Culture Techniques
Muscle, Smooth, Vascular
Recombinant Fusion Proteins
Published Version (Please cite this version)10.3727/096368909X478650
Publication InfoPetersen, Thomas H; Hitchcock, Thomas; Muto, Akihito; Calle, Elizabeth A; Zhao, Liping; Gong, Zhaodi; ... Niklason, Laura E (2010). Utility of telomerase-pot1 fusion protein in vascular tissue engineering. Cell Transplant, 19(1). pp. 79-87. 10.3727/096368909X478650. Retrieved from https://hdl.handle.net/10161/4616.
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Professor of Pharmacology and Cancer Biology
The Counter lab studies the molecular mechanisms underlying the evolution of normal cells into cancer. The lab is divided into two major areas studying key features of human cancers. Immortalization: We have shown that the ability of cancer cells to keep dividing, or become immortal, is a fundamental aspect of tumorigenesis, and is due to elongation of telomeres. Current efforts focus on the molecular biology of telomere-binding proteins in regulating telomere l