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Effects of alkyl gallates on P-glycoprotein function
Shuji Kitagawa1, Tomohiro Nabekura, Shizu Kamiyama
1Laboratory of Pharmaceutics, Faculty of Pharmaceutical Sciences, Niigata University of Pharmacy and Applied Life Sciences, Japan. kitagawa@niigata-pharm.ac.jp
Biochemical Pharmacology
|September 6, 2005
Summary
Food antioxidants, alkyl gallates, inhibit P-glycoprotein (P-gp) drug efflux. Longer alkyl chains and gallic acid moieties enhance this P-gp inhibition, potentially restoring chemotherapy effectiveness.
Area of Science:
- Biochemistry
- Pharmacology
- Cell Biology
Background:
- P-glycoprotein (P-gp) is a key efflux pump involved in multidrug resistance (MDR).
- Modulating P-gp activity is crucial for enhancing the efficacy of chemotherapy drugs.
- Alkyl gallates are food antioxidants with potential biological activities.
Purpose of the Study:
- To investigate the effects of alkyl gallates on P-glycoprotein (P-gp) function.
- To determine the role of alkyl chain length and gallic acid structure in P-gp modulation.
- To assess the impact of alkyl gallates on the cellular accumulation and efflux of P-gp substrates.
Main Methods:
- Utilized P-gp overexpressing KB-C2 cells.
- Assessed the cellular accumulation and efflux of rhodamine 123 and daunorubicin.
- Examined the effects of various alkyl gallates and related compounds, including n-dodecylresorcinol, lauric acid, and n-dodecyl-beta-d-maltoside.
Main Results:
- Alkyl gallates significantly increased the cellular accumulation of P-gp substrates (rhodamine 123 and daunorubicin).
- This accumulation effect was dependent on the length of the alkyl chain, with longer chains showing greater inhibition of P-gp efflux.
- Compounds lacking a phenol group, like lauric acid and n-dodecyl-beta-d-maltoside, did not increase substrate accumulation, highlighting the importance of the gallic acid moiety.
Conclusions:
- Both the gallic acid moiety and a long alkyl chain are critical for modifying P-gp function.
- Alkyl gallates inhibit P-gp-mediated drug efflux.
- Alkyl gallates may restore the cytotoxicity of drugs like daunorubicin by overcoming P-gp-mediated resistance.