Abstract：
:We have quantitatively measured gene expression for the sodium-dependent glucose cotransporters 1 and 2 (SGLT1 and SGLT2) in 23 human tissues using the method of real time PCR. As predicted, our results revealed that the expression of SGLT1 was very high in the small intestine (1.2E + 6 molecules/microg total RNA) relative to that in the kidney (3E + 4 molecules/microg total RNA). Surprisingly, we observed that the expression of SGLT1 in human heart was unexpectedly high (3.4E + 5 molecules/microg total RNA), approximately 10-fold higher than that observed in kidney tissue. DNA sequencing confirmed that the PCR amplified fragment was indeed the human SGLT1 gene. Moreover, in situ hybridization studies using a digoxigenin (DIG)-labeled antisense cRNA probe corresponding to human SGLT1 cDNA confirm that human cardiomyocytes express SGLT1 mRNA. In contrast, the expression of SGLT2 in human tissues appears to be ubiquitous, with levels ranging from 6.7E + 4 molecules/microg total RNA (in skeletal muscle) to 3.2E + 6 molecules/microg total RNA (in kidney), levels 10-100-fold higher than the expression of SGLT1 in the same tissues. Our finding that human cardiomyocytes express high levels of SGLT1 RNA suggests that SGLT1 may have a functional role in cardiac glucose transport. Since several SGLT inhibitors are currently in development as potential anti-diabetic agents, it may be important to assess the functional consequences of inhibition of SGLT1 in the heart.
journal_name
J Cell Biochemjournal_title
Journal of cellular biochemistryauthors
Zhou L,Cryan EV,D'Andrea MR,Belkowski S,Conway BR,Demarest KTdoi
10.1002/jcb.10631subject
Has Abstractpub_date
2003-10-01 00:00:00pages
339-46issue
2eissn
0730-2312issn
1097-4644journal_volume
90pub_type
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