title: Simple radioimmunological method for urinary 6-keto-PGF1 alpha measurement.
abstract: A radioimmunoassay for the determination of 6-keto-PGF1 alpha (stable metabolite of Prostacyclin) in urine using a specific antiserum, is described. The antibody used, showed no significant cross-reactivity with other PGS. (3H)-6-keto-PGF1 alpha has been used as tracer and a 30% Hydroxyapatite suspension was utilized for the separation of bound and free fractions. Standard curve ranges between 2 and 1000 pg thus allowing measurements in urine. Aliquots of 0.2 to 1 ml of 24 hours urinary samples were submitted to a preextraction step with Hexane in order to eliminate neutral fats. After acidifying with 0.1 N HCl to pH = 3.5-4, an Ethyl Ether extraction step was performed showing a recovery of 66%. Repeated analysis of a rat urine pool, showed 7.7 intraassay and 9.8 interassay variation coefficients. Values obtained amounted to 38.3 +/- 4.6 ng/24 h in normal rats and 133 +/- 32 ng/24 h in 5% NaCl loaded rats (p less than 0.001). The values obtained in healthy men were 508 +/- 94 ng/24 h and in women 375 +/- 136 (p less than 0.05).
mesh_terms: D015121:6-Ketoprostaglandin F1 alpha / Q000652:urine*; D000818:Animals; D000937:Antigen-Antibody Reactions; D005260:Female; D006801:Humans; D006882:Hydroxyapatites; D008297:Male; D011863:Radioimmunoassay / Q000379:methods*; D051381:Rats; D012965:Sodium Chloride / Q000008:administration & dosage; D013696:Temperature; D013997:Time Factors
chemical_list: D006882:Hydroxyapatites; D012965:Sodium Chloride; D015121:6-Ketoprostaglandin F1 alpha