18.4.2.2 Urine The HPLC radiochromatographic profiles of pooled urine
from rats, dogs, monkeys, and humans were also determined (Table 18.7).
18.4.2.3 Feces and Bile Excretion in feces represented more than 95% of
the recovered radioactive dose in rats, dogs, monkeys, and humans.
Muraglitazar was one of the abundant components present in feces from all
species. The HPLC-radiochromatograms of pooled bile samples from rats,
monkeys, and humans are shown in Fig. 18.3. The relative distribution of
metabolites in urine and feces (as % of dose) is shown in Table 18.7.
TABLE 18.7 Relative distribution (percent of dose) of radioactive metabolites in
pooled urine and feces after an oral dose of [^14 C]muraglitazar to intact rats, dogs,
monkeys, and humans.
Metabolite distribution (% of dose) in urine and fecesbRat Dog Monkey HumanMetaba Urine Feces Urine Feces Urine Feces Urine Feces
M1 0.22 1.75 0.44 0.89 1.04 2.81 0.06 0.80
M2 0.05 9.65 ND ND 0.08 1.29 ND 0.56
M3 Tracec ND ND ND ND 2.41 ND 1.36
M4 NDd ND ND 0.34 ND 0.16 ND 2.83
M5 0.01 2.63 ND 0.38 0.26 1.61 0.16 11.45
M6 0.01 ND ND ND 0.01 3.22 ND 1.48
M7 ND 0.43 ND 0.18 ND 0.32 ND 2.21
M8 ND ND ND 0.89 0.13 6.43 ND 0.56
M8a Trace 4.39 ND 0.18 0.12 ND 0.03 0.56
M9 ND 2.63 ND 0.89 ND 0.56 ND 2.46
M10 0.03 0.88 ND 1.10 0.01 7.24 0.03 8.20
M11 Trace 0.88 ND 1.78 0.59 25.73 0.07 5.92
M12 Trace ND ND 0.10 0.04 1.61 ND 0.13
M13 Trace 0.88 ND ND 0.02 0.80 1.00 0.06
M14 Trace 0.88 ND 0.85 0.03 0.56 ND 1.60
M15 0.12 34.20 ND 24.92 0.08 7.24 ND 3.33
M16 ND 0.88 ND 0.18 ND 0.16 ND 3.21
M18 Trace ND ND ND Trace ND 0.20 ND
M20 Trace ND ND ND Trace ND ND ND
M21 0.21 0.88 0.01 ND 0.33 0.40 0.04 0.40
Parent 0.02 13.16 0.01 52.51 0.11 7.24 0.29 9.62
Otherse 0.3 13.6 0.02 NA 0.79 4.02 0.58 2.40
Total 0.97 74.1 0.48 85.2 3.63 73.49 2.46 59.20
% Excretion 1.0 87.7 0.5 89.0 3.7 80.4 2.56 61.59
aMetabolites are assigned based on retention times of radioactive peaks and LC/MS analysis.
bRadioactive peaks are reported as a percentage of dose (% of the sample multiplied by % excretion).
cTrace¼<0.01% radioactivity and detected by LC/MS.
dND¼not detected. Criteria are no discernable radioactive peak,<0.01% radioactivity and not
detected by LC/MS.
eUncharacterized peaks.
592 ADME STUDIES IN ANIMALS AND HUMANS