DIMINISHED RESPONSIVENESS OF SENESCENT NORMAL HUMAN FIBROBLASTS TO TNF-DEPENDENT PROLIFERATION AND INTERLEUKIN PRODUCTION IS NOT DUE TO ITS EFFECT ON THE RECEPTORS OR ON THE ACTIVATION OF A NUCLEAR FACTOR NF-KAPPA-B

被引:30
作者
AGGARWAL, BB
TOTPAL, K
LAPUSHIN, R
CHATURVEDI, MM
PEREIRASMITH, OM
SMITH, JR
机构
[1] BAYLOR COLL MED,DEPT CELL BIOL,HOUSTON,TX 77030
[2] BAYLOR COLL MED,DEPT MED,HOUSTON,TX 77030
[3] BAYLOR COLL MED,HUFFINGTON CTR AGING,DIV MOLEC VIROL,HOUSTON,TX 77030
关键词
D O I
10.1006/excr.1995.1169
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
The limited life span in culture of normal human diploid fibroblasts (HDF) has provided a model of cellular senescence, The short-term growth of these cells in culture is regulated by a number of different cytokines, including tumor necrosis factor (TNF), interleukin-l (IL-1), and fibroblast growth factor (FGF), However, the effect of senescence on the responsiveness of HDF to these cytokines is not known, In the present report, we examined the effects of TNF on foreskin-derived HDF at different passage levels. We compared the response of HDF cells at population doubling (PD) 23 (young) with that of cells at PD 70 (senescent), Young cells proliferated in response to TNF in a dose-dependent manner, Under these conditions TNF had no effect on senescent HDF, The decrease in TNF responsiveness was found to be dependent on PD. The lack of response of senescent HDF was not unique to TNF, since FGF and IL-1 were also ineffective, In contrast to senescent HDF, TNF-dependent proliferation of young HDF could be further potentiated by IL-1 and FGF, suggesting an independent signaling mechanism, On exposure to TNF, senescent HDF produced 1L-6 and 1L-8, but to a much lower degree than that produced by young HDF. The diminished responsiveness of senescent HDF to TNF does not appear to be due to the difference in either receptor number or affinity, since senescent cells had two- to threefold higher number of TNF receptors than young HDF but the same affinity, TNF induced the activation of a nuclear transcriptional factor, NF-KB, equally in both young and senescent cells, which indicates the lack of a defect in the early events of TNF signal transduction in senescent fibroblasts, Overall, our results indicate that there is an age-dependent decline in TNF-induced proliferation and in the production of interleukins by fibroblasts; this unresponsiveness appears not to be due to TNF receptors or NF-KB activation, These results may have importance in understanding the diminished immune response, inflammation, and wound healing associated with aging. (C) 1995 Academic Press, Inc.
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页码:381 / 388
页数:8
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