AI Article Synopsis
- D-aspartate (D-Asp) is produced by cultured mammalian cells like pheochromocytoma (PC)12 and its MPT1 subclone.
- Researchers observed that D-Asp levels in these cells are kept in a dynamic state of homeostasis.
- The study utilized the L-Glu transporter inhibitor TFB-TBOA, confirming that D-Asp is continuously released and taken up by cells, with an estimated release rate of about 3.8 pmol/h/100,000 cells.
Article Abstract
We previously reported for the first time that D-aspartate (D-Asp) is biosynthesized by cultured mammalian cells such as pheochromocytoma (PC)12 cells and its subclone MPT1 (FEBS Lett. 434 (1998) 231, Arch. Biochem. Biophys. 404 (2002) 92). We speculated that D-Asp levels in the intra- and extracellular spaces of the cultured cells are maintained in a dynamic state of homeostasis. To test this here, we utilized a novel and potent L-Glu transporter inhibitor, TFB-TBOA. This inhibitor proved to be a genuine nontransportable blocker of the transporter even during long periods of culture. Use of this inhibitor with MPT1 cells confirmed that D-Asp levels are in a dynamic steady state where it is constantly released into the extracellular space by a yet undefined mechanism as well as being constantly and intensively taken up by the cells via the L-Glu transporter. We estimated the rate with which D-Asp is constitutively released from MPT1 cells is approx. 3.8 pmol/h/1x10(5) cells.
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| http://dx.doi.org/10.1016/j.lfs.2004.10.057 | DOI Listing |
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