Radioreceptor assay for atrial natriuretic factor

Add time:09/02/2019    Source:sciencedirect.com

Interest in accurate measurement of atrial natriuretic factor (ANF) in biological fluids and various tissues has been stimulated by recent data indicating the possible role of ANF in the homeostasis of salt and water. The presence of high-affinity binding sites for ANF in rat glomeruli has allowed us to develop a rapid, sensitive, and simple radioreceptor assay (RRA). A saturable high-affinity binding site on the membranes of rat glomeruli has been characterized by a dissociation constant of 33 pm and binding capacity of 396 fmol/mg protein. Rat plasma extracts or atrial homogenates or standards were incubated with radioiodinated ANF and a preparation of rat glomerular membranes. The receptor-bound and free radioactivity were separated by filtration on Whatman GFC paper after 1 h incubation at room temperature. The sensitivity of the RRA was 2.08 fmol. The effective concentration of standard ANF that displaced 50% of labeled receptor-bound ANF (EC50) was 43.3 ± 2.6 fmol/ml (n = 7). Both intra- and interassay coefficients of variation were smaller than 11%. This RRA assay has been compared with radioimmunoassay (RIA). High correlations for 19 plasma extracts and 34 atrial homogenates (r = 0.973 and r = 0.954, respectively) tested by RRA and RIA were obtained. This good correlation between the two methods suggest that the immunoreactive material found in rat plasma and atrial homogenates also displays biological activity.

We also recommend Trading Suppliers and Manufacturers of atrial, natriuretic factor (1-28), Ala(8)- (cas 114076-99-2). Pls Click Website Link as below: cas 114076-99-2 suppliers

Prev:Direct chemiluminescent enzyme immunoassay for atrial natriuretic peptide in mammalian plasma using a PEGylated antibody
Next:Design and synthesis of metabolically stable atrial natriuretic factor analogs: Amino- and carboxy-terminal stabilization)