Abstract:
:Glucose and tumor necrosis factor-alpha (TNFalpha) concentrations are elevated in diabetes. Both of these factors correlate with diabetic vasculopathy and endothelial cell apoptosis, yet their combined effects have not been measured. We have previously shown that the angiogenic growth factor fibroblast growth factor-2 (FGF-2), which is generally protective against endothelial cell death, is similarly elevated in high glucose conditions. We therefore investigated the effect of TNFalpha on endothelial cell death under normal and elevated glucose conditions, with a particular focus on FGF-2. Porcine aortic endothelial cells were cultured in 5 and 30 mM glucose and stimulated with TNFalpha, together with FGF-2 or a neutralizing FGF-2 antibody. Cell death was measured via cell counts or an annexin apoptotic assay, and cell cycle phase was determined by propidium iodide labeling. TNFalpha-induced endothelial cell death increased for cells in high glucose, and cell death was enhanced with increasing FGF-2 exposure and negated by a neutralizing FGF-2 antibody. Endothelial cells were most susceptible to TNFalpha-induced cell death when stimulated with FGF-2 18 h prior to TNFalpha, corresponding to cell entry into S phase of the proliferative cycle. The FGF-2 associated increase in TNFalpha-induced cell death was negated by blocking cell entry into S phase. Endothelial cell release of FGF-2 in high glucose leads to cell cycle progression, which makes cells more susceptible to TNFalpha-induced cell death. These data suggest that growth factor outcomes in high glucose depend on secondary mediators such as cytokines and stimulation cell cycle timing.
journal_name
J Cell Physioljournal_title
Journal of cellular physiologyauthors
Clyne AM,Zhu H,Edelman ERdoi
10.1002/jcp.21476subject
Has Abstractpub_date
2008-10-01 00:00:00pages
86-92issue
1eissn
0021-9541issn
1097-4652journal_volume
217pub_type
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