Thromboxane A2 receptors are influenced by cell density in cultured rat aortic smooth muscle cells.
The influence of cell density on the binding characteristics of thromboxane A2/prostaglandin H2 (TXA2/PGH2) receptors in rat aortic vascular smooth muscle cells in culture were determined using [1S- (1 alpha, 2 beta (5Z), 3a (1E, 3R*), 4 alpha)]- 7 -[3- (3-hydroxy -4- (4'-iodophenoxy)-1-butenyl)-7-oxabicyclo-[2.2.1]heptan- 2yl]-5-heptenoic acid (125I-BOP). The Bmax for 125I-BOP was 5,430 +/- 139 sites/cell (26.9 +/- 5.7 fmoles/mg protein) for cells cultured in 1% fetal calf serum and 2809 +/- 830 sites/cell (13.1 +/- 2.2 fmoles/mg protein) for cells cultured in 10% fetal calf serum. Cells were allowed to grow to varying densities and then harvested for assay. There was a negative correlation between the Bmax and the cell density per flask. The Kd for I-BOP did not significantly vary in any of the studies. The results demonstrate that cell density plays an important role in influencing the expression of vascular TXA2/PGH2 receptors.
Masuda
A
A
Department of Pharmacology, Medical University of South Carolina.
Halushka
P V
PV
D000818:Animals; D001011:Aorta / Q000166:cytology / Q000378:metabolism; D001643:Bridged Bicyclo Compounds; D019086:Bridged Bicyclo Compounds, Heterocyclic; D002452:Cell Count; D002478:Cells, Cultured; D005231:Fatty Acids, Unsaturated; D008297:Male; D009131:Muscle, Smooth, Vascular / Q000166:cytology* / Q000378:metabolism; D051381:Rats; D011982:Receptors, Prostaglandin / Q000378:metabolism*; D017482:Receptors, Thromboxane; D044244:Receptors, Thromboxane A2, Prostaglandin H2
D001643:Bridged Bicyclo Compounds; D019086:Bridged Bicyclo Compounds, Heterocyclic; D005231:Fatty Acids, Unsaturated; D011982:Receptors, Prostaglandin; D017482:Receptors, Thromboxane; D044244:Receptors, Thromboxane A2, Prostaglandin H2; C061750:7-(3-(3-hydroxy-4-(4'-iodophenoxy)-1-butenyl)-7-oxabicyclo(2.2.1)heptan-2-yl)-5-heptenoic acid