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Establishment of ultra long-lived cell lines by transfection of TERT into normal human fibroblast TIG-1 and their characterization.

Abstract：

:To establish useful human normal cell lines, TERT (telomerase reverse transcriptase) cDNA was transfected into normal female lung fibroblast, TIG-1. After long-term-sub-cultivation of 74 individual clones selected for resistance to G418, we obtained 55 cultures with normal range of life span [75 PDL (population doubling level)], 16 cultures with extended life span (75-140 PDL). In addition, 3 immortal cell strains and unexpectedly, one ultra long-lived cell line (ULT-1) with life span of 166 PDL were established. IMT-1, one of the immortal cell strains was confirmed to maintain long telomere length, high telomerase activity and an extremely low level of p16INK4A. They also showed moderate p53 and p21CIP1 expression, keeping vigorous growth rate even at 450 PDL. High level of fibronectin and collagen 1α expression confirmed IMT-1 as normal fibroblasts, although one X chromosome had been lost. ULT-1, however, kept a near normal karyotypes and had shortening of telomere length, high expression of p16INK4A, moderate levels of senescence associated-β-galactosidase positive cells and decreased growth rate only after 150 PDs (population doublings), and finally reached senescence at 166 PDL with morphology of normal senescent fibroblasts. As resources of standard normal human cell, abundant vials of early and middle passages of ULT-1 have been stocked. The use of the cell line is discussed, focusing on isograft of artificial skin and screening of anti-aging or safe chemical agents.

journal_name

Cell Biol Int

journal_title

Cell biology international

authors

Kamada M,Kumazaki T,Matsuo T,Mitsui Y,Takahashi T

doi

10.1042/CBI20110460

subject

Has Abstract

pub_date

2012-06-01 00:00:00

pages

519-27

issue

6

eissn

1065-6995

issn

1095-8355

pii

CBI20110460

journal_volume

36

pub_type

杂志文章

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