In:
Proceedings of the National Academy of Sciences, Proceedings of the National Academy of Sciences, Vol. 85, No. 18 ( 1988-09), p. 6748-6752
Abstract:
Naturally quiescent human lymphocytes, consisting predominantly of T cells, contain mRNA(s) that can inhibit DNA synthesis when injected into either human diploid fibroblasts (IMR-90) or transformed recipient cells (HeLa). By using an automated capillary microinjection system and a fluorescent coinjection marker (fluorescein isothiocyanate-dextran), individually injected cells can be retrieved and analyzed for DNA synthesis. mRNA isolated from resting T cells is able to block the cells from entering the S phase. The block is reversible and leads to a delay in DNA synthesis. The inhibitory effect is not observed if the injected mRNA is isolated from growth-activated T cells. The disappearance of the inhibition coincides with the approach of the G1/S boundary in both the donor T cells and the recipient human fibroblasts. The mRNA of resting T cells was size-fractionated and the peak inhibitory activity was recovered in a fraction approximately equal to 1.5 kilobases long.
Type of Medium:
Online Resource
ISSN:
0027-8424
,
1091-6490
DOI:
10.1073/pnas.85.18.6748
Language:
English
Publisher:
Proceedings of the National Academy of Sciences
Publication Date:
1988
detail.hit.zdb_id:
209104-5
detail.hit.zdb_id:
1461794-8
SSG:
11
SSG:
12
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