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Biochem Biophys Res Commun. 2012 May 25;422(1):64-9. doi: 10.1016/j.bbrc.2012.04.106. Epub 2012 Apr 27.

Protein kinase C regulates amino acid transporter ATB(0,+).

Author information

1
Nencki Institute of Experimental Biology, 3 Pasteur Street, 02-093 Warsaw, Poland.

Abstract

ATB(0,+) (SLC6A14) is a transporter specific towards neutral and cationic amino acids, known to be up-regulated in malignant tumor cells. We cloned cDNA for rATB(0,+) and expressed it in HEK 293 cells. The ATB(0,+) over-expression correlated with increased l-leucine transport, stimulated by protein kinase C (PKC) activator and attenuated by PKC inhibitors. Transport stimulation was correlated with phosphorylation on serine moiety of the transporter and its augmented plasma membrane presence. Immunoprecipitation experiments demonstrated ATB(0,+) interaction with PKCα, but not with other classical or novel PKC isoforms. Immunocytochemistry experiments showed a transfer of PKCα to plasma membrane upon phorbol ester activation and co-localization with ATB(0,+). The observed regulation of ATB(0,+) by PKC correlates with high activity of both proteins reported for cancer cells.

PMID:
22561015
DOI:
10.1016/j.bbrc.2012.04.106
[Indexed for MEDLINE]

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