Does the HMG-CoA reductase inhibitor pravastatin influence nucleation of cholesterol crystals in supersaturated model bile?

OBJECTIVE

To assess whether the presence in bile of HMG-CoA reductase inhibitors, which are secreted predominantly into the bile, influences biliary lithogenicity.

DESIGN

Physiologic biliary concentrations of the hydrophilic HMG-CoA reductase inhibitor pravastatin were added to supersaturated model bile (cholesterol saturation index 1.4) and vesicles, the latter with and without the concomitant addition of the nucleation-promoting bile salt taurodeoxycholate.

OUTCOME MEASURES

Nucleation time, defined as the number of days after which cholesterol monohydrate crystals are visible by phase contrast microscopy in filtered samples of model bile and vesicles, was assessed.

RESULTS

The addition of pravastatin 0.01-1 mg/ml did not influence the nucleation time of supersaturated model bile (mean nucleation time without pravastatin: 8.3 +/- 2.2 days (SD), with pravastatin 1 mg/ml 9.3 +/- 0.4 days and pravastatin 0.01 mg/ml 7.6 +/- 2.3 days). The addition of similar concentrations of pravastatin to vesicle fractions alone did not influence nucleation time (> 20 days), nor could it prevent the nucleation-promoting effect of taurodeoxycholate (nucleation time with or without pravastatin 1 day).

CONCLUSION

The results from this in-vitro study indicate that the presence of pravastatin in bile may not influence gallbladder bile lithogenicity. It can be hypothesized that this also applies to other HMG-CoA reductase inhibitors.