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Expression and immunolocalization of multidrug resistance protein 2 in rabbit small intestine
R A Van Aubel1, A Hartog, R J Bindels
1Department of Pharmacology and Toxicology, UMC St. Radboud, University of Nijmegen, P.O. Box 9101, 6500 HB, Nijmegen, The Netherlands.
Abstract:
Multidrug resistance protein 2 (MRP2) is an ATP-dependent transporter of anionic drugs and conjugates. It functions as an efflux pump in the apical membranes of liver and kidney cells, but its membrane localization in small intestine has not yet been defined. The present study demonstrates exclusive localization of Mrp2 to the brush-border (apical) membrane of villi, decreasing in intensity from the villus tip to the crypts. In immunoblot analysis of crude membranes of various rabbit tissues, Mrp2 was only found in small intestine, kidney and liver. These results are in-line with the supposed function of Mrp2 in drug excretion.
Insights
Multidrug resistance protein 2 (MRP2) is an ATP-dependent transporter. This study shows MRP2 is exclusively located in the small intestine
Area of Science:
- Biochemistry
- Cell Biology
- Pharmacology
Background:
- Multidrug resistance protein 2 (MRP2) functions as an ATP-dependent efflux pump.
- MRP2 is found in the apical membranes of liver and kidney cells.
- MRP2's membrane localization in the small intestine remains undefined.
Purpose of the Study:
- To determine the precise membrane localization of MRP2 in the small intestine.
- To investigate the distribution of MRP2 within the small intestine's cellular structure.
- To correlate MRP2 expression with its known function in drug excretion.
Main Methods:
- Immunoblot analysis of crude membranes from various rabbit tissues.
- Histological examination of small intestine tissue to identify Mrp2 localization.
- Quantitative assessment of Mrp2 intensity from villus tip to crypt.
Main Results:
- MRP2 exclusively localizes to the brush-border (apical) membrane of small intestine villi.
- MRP2 expression intensity decreases from the villus tip towards the crypts.
- Immunoblot analysis confirmed Mrp2 presence in small intestine, kidney, and liver tissues.
Conclusions:
- MRP2 is confirmed to be localized in the apical membrane of small intestine villi.
- The distribution pattern of MRP2 in the small intestine aligns with its role in drug excretion.
- This finding clarifies MRP2's functional significance in intestinal drug transport.
