Interactions of arterial cells: III. Stathmokinetic analyses of smooth muscle cells cocultured with endothelial cells.

TitleInteractions of arterial cells: III. Stathmokinetic analyses of smooth muscle cells cocultured with endothelial cells.
Publication TypeJournal Article
Year of Publication1988
AuthorsStaiano-Coico L, Hajjar DP, Hefton JM, Hajjar KA, Kimmel M
JournalJ Cell Physiol
Date Published1988 Mar
KeywordsAnimals, Arteries, Cell Cycle, Cell Division, Culture Media, DNA, Endothelium, Vascular, Flow Cytometry, Interphase, Kinetics, Mitosis, Muscle, Smooth, Vascular, RNA

Arterial endothelial cells (EC) or their conditioned medium (ECCM) can alter the proliferation of cocultured arterial smooth muscle cells (SMC). Previously, we have shown, as have others, that EC regulate the growth of cocultured SMC depending on the density of both cell types. To ascertain the rate of cell-cycle traverse in preconfluent arterial SMC cocultured with arterial EC or ECCM (derived from preconfluent EC), we have conducted a series of stathmokinetic experiments using flow cytometry to determine where specific changes may occur in the cell cycle. Results of our experiments indicate for the first time that ECCM stimulates the proliferation of preconfluent SMC by significantly shortening the residence times in the G1 and S phases of the cell cycle. The predominant relative effect occurs within the early G1 (G1A) compartment where pretreatment with ECCM shortens the residence time by approximately 55%. Furthermore, we have observed that preincubation of serum-free ECCM with antiplatelet-derived growth factor (PDGF) antibody abolishes any mitogenic effect on SMC. This suggests that EC secrete PDGF-like molecules which enhance the proliferation rate of preconfluent, cocultured SMC. These findings support the hypothesis that arterial EC may secrete mitogens which stimulate arterial SMC proliferation in the vascular wall.

Alternate JournalJ Cell Physiol
PubMed ID2450881
Grant ListAR-34485 / AR / NIAMS NIH HHS / United States
HL-01352 / HL / NHLBI NIH HHS / United States
HL-18828 / HL / NHLBI NIH HHS / United States
Related Faculty: 
David P. Hajjar, Ph.D.

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