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Evaluation of an isotope ratio method for measuring biliary cholesterol secretion.

We have evaluated an isotope ratio method for measuring biliary cholesterol secretion. Secretion was measured in eight nonhuman primates by analysis of radioactivity of feces and plasma 4 weeks after intravenous administration of a single dose of [3H]cholesterol. For the test, [14C]cholesterol was fed in known amounts daily for 10 days. The ratio of isotopes in feces (14C/3H) was equivalent to the ratio of total radioactivity that entered the intestine from diet and bile. Assuming biliary cholesterol specific activity equals plasma cholesterol specific activity, the mass of cholesterol secreted daily in the bile could be calculated. In paired experiments in four animals we were able to directly compare biliary secretion by the new method with mass measurement by intraduodenal intubation (Grundy, S. M., and A. L. Metzger. 1972. Gastroenterology. 52: 2100-1216). The two methods correlated well in these four animals (r = 0.97). We further noted that bile secretion by the new method (eight animals) and by the mass method (four animals) correlated well with body weight (r = 0.94 for weight vs secretion by the isotope ratio method; r = 0.97 for weight vs secretion by the mass ratio method). Ranges of body weight and secretion for the eight animals were 4.2-13.1 kg and 3.6-11.4 mg/hr, respectively. The slopes of the two regression lines for body weight vs. secretion measured by the two methods did not differ significantly from one another (F(1.8) = 1.42; 0.25 less than P less than 0.50).(ABSTRACT TRUNCATED AT 250 WORDS)