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Table 2 Bopta and Meb accumulation and decay parameters in livers and hepatocytes

From: Concentrations and pharmacokinetic parameters of MRI and SPECT hepatobiliary agents in rat liver compartments

Imaging agents

Bopta

Meb

p, Bopta versus Meb

Bopta

Livers

Normal

Normal

 

no Mrp2

T0,liver [min]

8.0 ± 0.5

5.5 ± 1.1

< 0.001

-

T0,HC [min]

4.7 ± 1.3

4.0 ± 1.5

.37

-

SlopeL1,liver [μM/min]

37 ± 5

333 ± 71

< 0.001

28 ± 6*

SlopeL1,HC [μM/min]

57 ± 16

452 ± 107

< 0.001

35 ± 8**

SlopeL2,liver [μM/min]

8 ± 1

16 ± 5

< 0.001

-

SlopeL2,HC [μM/min]

8 ± 2

22 ± 7

< 0.001

-

kel,liver [min−1]

0.09 ± 0.01

0.13 ± 0.02

< 0.001

-

kel,HC [min−1]

0.10 ± 0.02

0.16 ± 0.03

< 0.001

-

T1/2,liver [min]

7.6 ± 0.9

5.5 ± 0.7

< 0.001

-

T1/2,HC [min]

7.4 ± 1.3

4.5 ± 0.6

< 0.001

-

CLel,HC [mL/min]

0.95 ± 0.17

1.44 ± 0.26

< 0.001

-

  1. Bopta and Meb accumulation in normal livers and hepatocytes fitted nonlinear regressions described by two lines L1 and L2 intersecting at T0 or time when bile secretion started to impact the accumulation profile. During decay, liver and hepatocyte concentrations fitted a one-phase decay described by kel and T1/2. CLel,HC was calculated by kel · VHC. Statistics between normal livers and livers lacking Mrp2 (column 2 versus column 5) are p < 0.010 (*) and p < 0.001 (**). CLel,HC Elimination clearance from hepatocytes, kel Elimination constant rate, HC Hepatocytes, T1/2 Half-life of elimination, VHC Hepatocyte volume