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Nucleoside transporter gene expression in wild-type and mENT1 knockout mice
Kathryn Graham1, Sylvia Yao, Lorelei Johnson
1Cross Cancer Institute, 11560 University Avenue, Edmonton, Alberta, Canada.
Summary
Investigating mouse equilibrative nucleoside transporter 1 (mENT1) knockout mice revealed complex changes in nucleoside transporter (NT) gene expression across tissues, highlighting species-specific differences in kidney function.
Area of Science:
- Biochemistry
- Genetics
- Physiology
Background:
- Mammalian nucleoside transporters (NTs) have overlapping roles, complicating the study of individual NT functions.
- Gene knockout mouse models offer a valuable approach to understanding NT protein physiology.
Purpose of the Study:
- To investigate the physiological importance of the mouse equilibrative nucleoside transporter 1 (mENT1).
- To analyze the compensatory changes in nucleoside transporter gene expression in mENT1 knockout mice.
Main Methods:
- Generation of mENT1 homozygous knockout mice.
- Quantitative survey of NT gene expression in 10 tissues.
- Microarray analysis of heart and kidney tissues.
Main Results:
- mENT1 knockout mice displayed a complex, tissue-specific pattern of altered NT gene expression.
- Upregulation of mCNT1 and mCNT3 observed in colon; downregulation of mCNT2 and mENT4 in lung.
- mCNT3 transcripts were undetectable in mouse kidneys, contrasting with findings in other species.
Conclusions:
- Individual NT gene disruption leads to intricate compensatory changes in NT expression.
- Significant species-specific differences exist in renal nucleoside transport mechanisms.
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