THE HUMAN-DIPLOID FIBROBLAST SENESCENCE PATHWAY IS INDEPENDENT OF INTERLEUKIN-1-ALPHA MESSENGER-RNA LEVELS AND TYROSINE PHOSPHORYLATION OF FGFR-1 SUBSTRATES

In vitro cellular senescence of human umbilical vein endothelial cells (HUVEC) may involve the intracellular activity of the signal peptide- less cytokine interleukin (IL)1 alpha. To determine whether senescence of other human diploid cells involves the function of IL-1 alpha, we examined the steady-state expression of IL-1 alpha mRNA in IMR-90 fibr oblasts. The IL-1 alpha transcript was not elevated in senescent IMR-9 0 cells. With the exception of the plasminogen activator inhibitor (PA I)-1 transcript, other IL-1 alpha-response gene mRNAs were not induced in senescent IMR-90, although the mRNA for each gene was induced by e xogenous IL-1 alpha. The mRNA expression of cell cycle-specific genes demonstrated that Fos and ornithine decarboxylase (ODC) were induced i n young and senescent cells in response to both serum and fibroblast g rowth factor (FGF)-1. Histone (H)3 mRNA was induced by serum in young cells, but not in senescent cells, and FGF-1 failed to induce H3 mRNA in either young or senescent cells. Further, while young IMR-90 popula tions were able to respond to serum as an initiator of DNA synthesis a nd cell growth, they did not exhibit a response to exogenous FGF-1. FG F receptor (R)-1 substrates were not tyrosine phosphorylated in either young or senescent IMR-90 cells. These data demonstrate that IL-1 alp ha and FGF-1 may have different functions in HUVEC and IMR-90 fibrobla st populations including distinct pathways for the regulation of cellu lar growth and senescence.