Document Detail


Functional characterization and molecular expression of large neutral amino acid transporter (LAT1) in human prostate cancer cells.
MedLine Citation:
PMID:  23270998     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The primary objective of this study is to functionally characterize and provide molecular evidence of large neutral amino acid transporter (LAT1) in human derived prostate cancer cells (PC-3). We carried out the uptake of [3H]-tyrosine to assess the functional activity of LAT1. Reverse transcription-polymerase chain reaction (RT-PCR) analysis is carried out to confirm the molecular expression of LAT1. [3H]-tyrosine uptake is found to be time dependent and linear up to 60 min. The uptake process does not exhibit any dependence on sodium ions, pH and energy. However, it is temperature dependent and found maximal at physiological temperature. The uptake of [3H]-tyrosine demonstrates saturable kinetics with K(m) and V(max) values of 34 ± 3 μM and 0.70 ± 0.02 nanomoles/min/mg protein, respectively. It is strongly inhibited by large neutral (phenylalanine, tryptophan, leucine, isoleucine) and small neutral (alanine, serine, cysteine) but not by basic (lysine and arginine) and acidic (aspartic and glutamic acid) amino acids. Isoleucine-quinidine (Ile-quinidine) prodrug generates a significant inhibitory effect on [3H]-tyrosine uptake suggesting that it is recognized by LAT1. RT-PCR analysis provided a product band at 658 and 840 bp, specific to LAT1 and LAT2, respectively. For the first time, this study demonstrates that LAT1, primarily responsible for the uptake of large neutral amino acids, is functionally active in PC-3 cells. Significant increase in the uptake generated by Ile-quinidine relative to quinidine suggests that LAT1 can be utilized for enhancing the cellular permeation of poor cell permeable anticancer drugs. Furthermore, this cell line can be utilized as an excellent in vitro model for studying the interaction of large neutral amino acid conjugated drugs with LAT1 transporter.
Authors:
Mitesh Patel; Pranjali Dalvi; Mitan Gokulgandhi; Susamita Kesh; Tanvi Kohli; Dhananjay Pal; Ashim K Mitra
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Publication Detail:
Type:  Journal Article     Date:  2012-12-24
Journal Detail:
Title:  International journal of pharmaceutics     Volume:  443     ISSN:  1873-3476     ISO Abbreviation:  Int J Pharm     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2013-02-18     Completed Date:  2013-08-15     Revised Date:  2013-10-15    
Medline Journal Info:
Nlm Unique ID:  7804127     Medline TA:  Int J Pharm     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  245-53     Citation Subset:  IM    
Copyright Information:
Copyright © 2012 Elsevier B.V. All rights reserved.
Affiliation:
Division of Pharmaceutical Sciences, School of Pharmacy, University of Missouri-Kansas City, 2464 Charlotte Street, Kansas City, MO 64108, USA.
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MeSH Terms
Descriptor/Qualifier:
Biological Transport
Cell Culture Techniques
Cell Line, Tumor
Chromatography, Liquid
Dose-Response Relationship, Drug
Humans
Hydrogen-Ion Concentration
Isoleucine / analogs & derivatives*,  chemistry,  pharmacokinetics
Large Neutral Amino Acid-Transporter 1* / biosynthesis,  physiology
Male
Prodrugs / chemistry,  pharmacokinetics*
Prostatic Neoplasms / metabolism*,  pathology
Quinidine / analogs & derivatives*,  chemistry,  pharmacokinetics
Reverse Transcriptase Polymerase Chain Reaction
Substrate Specificity
Tandem Mass Spectrometry
Temperature
Time Factors
Tyrosine / metabolism*
Chemical
Reg. No./Substance:
0/Large Neutral Amino Acid-Transporter 1; 0/Prodrugs; 0/isoleucine-quinidine conjugate; 55520-40-6/Tyrosine; 56-54-2/Quinidine; 73-32-5/Isoleucine
Comments/Corrections
Comment In:
Int J Pharm. 2013 Oct 15;455(1-2):393   [PMID:  23850815 ]
Int J Pharm. 2013 Oct 15;455(1-2):394-5   [PMID:  23906750 ]

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