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J. Biol. Chem., Vol. 263, Issue 8, 3720-3728, Mar, 1988
DC Leitman, JW Andresen, RM Catalano, SA Waldman, JJ Tuan and F Murad
The stimulation of cyclic GMP accumulation and particulate guanylate
cyclase activity by atrial natriuretic peptide (ANP) was compared to the
affinity and number of ANP receptors in eight cultured cell types. At 100
nM, ANP increased cyclic GMP by 13-fold in bovine adrenal cortical, 35-fold
in human lung fibroblast, 58-fold in canine kidney epithelial, 60-fold in
bovine aortic smooth muscle, 120-fold in rat mammary epithelial, 260-fold
in rat Leydig, 300-fold in bovine kidney epithelial, and 475-fold in bovine
aortic endothelial cells. ANP (1 microM) increased particulate guanylate
cyclase activity by 1.5-, 2.5-, 3.1-, 3.2-, 5.0-, 7.0-, 7.8-, and 8.0-fold
in bovine adrenal cortical, bovine aortic smooth muscle, human lung
fibroblast, canine kidney epithelial, rat mammary epithelial, rat Leydig,
bovine kidney epithelial, and bovine aortic endothelial cells,
respectively. Specific 125I-ANP binding to intact rat Leydig (3,000
sites/cell; Kd = 0.11 nM), bovine aortic endothelial (14,000 sites/cell; Kd
= 0.09 nM), bovine adrenal cortical (50,000 sites/cell; Kd = 0.12 nM),
human lung fibroblast (80,000 sites/cell; Kd = 0.32 nM), and bovine aortic
smooth muscle (310,000 sites/cell; Kd = 0.82 nM) cells was saturable and
high affinity. No specific and saturable ANP binding was detected in bovine
and canine kidney epithelial and rat mammary epithelial cells. Two ANP-
binding sites of 66,000 and 130,000 daltons were specifically labeled by
125I-ANP after cross-linking with disuccinimidyl suberate. The
130,000-dalton ANP-binding sites bound to a GTP-agarose affinity column,
and the specific activity of guanylate cyclase was increased by 90-fold in
this fraction. Our results demonstrate that the increase in cyclic GMP
accumulation and particulate guanylate cyclase activity by ANP does not
correlate with the affinity and number of ANP-binding sites. These results
suggest that multiple populations of ANP receptors exist in these cells and
that only one receptor subtype (130,000 daltons) is associated with
particulate guanylate cyclase activity.
Atrial natriuretic peptide binding, cross-linking, and stimulation of cyclic GMP accumulation and particulate guanylate cyclase activity in cultured cells
Department of Medicine, Stanford University School of Medicine, California.
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