Journal of Pharmaceutical Investigation

The Korean Society of Pharmaceutical Sciences and Technology (한국약제학회)
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Mechanistic Studies of Ketoprofen Absorption in Perfused Rat Intestine Model

관류 랫드 장관모델에서의 케토프로펜의 흡수기전 연구

  • Kim, Mi-Jeong (Korea Food and Drug Administration) ;
  • Lane, Majella E. (University of London)
  • Published : 2007.04.21
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Abstract

The aim of this study was to investigate the absorption properties of ketoprofen. The in-situ perfusion model has advantages over in vitro models as it provides intact lymphatic and blood flow circulation. The absorption properties of six different concentrations of ketoprofen have been studied in single pass in-situ rat intestine model. $^{14}C-PEG$ 4000 was used as a permeability marker and the possibility of an energy dependent contribution to ketoprofen absorption was also Investigated using the metabolic inhibitor sodium azide. Three different concentrations of sodium azide were studied to examine its effect on absorption of ketoprofen from the rat intestine. The findings of this study suggest that mono-carboxylic type drugs like ketoprofen cause permeability changes in the intestine. This is shown by the increase in absorption of $^{14}C-PEG$ 4000 as the concentration of ketoprofen is increased. However, the trend for ketoprofen permeability is to decrease over the concentration ranges. It was observed that the Papp values for ketoprofen with sodium azide shows a trend towards reduction in the amount of ketoprofen absorbed from the rat intestine which was significantly different (p<0.05) from that of ketoprofen with sodium azide 3.0mM. This indicates that sodium azide has an affect on the absorption of ketoprofen. The pH of all the perfusion solutions was altered to ${\sim}pH\;6.7$ by the buffering capacity of the small intestine secretions. The results suggest that mechanisms other than passive diffusion may be involved in ketoprofen absorption. This would be consistent with the involvement of active transport or saturatable processes in the absorption of drugs containing monocarboxylic acid group, as has been previously suggested from in vitro data.

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References

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