Mutual role of ecto-5'-nucleotidase/CD73 and concentrative nucleoside transporter 3 in the intestinal uptake of dAMP

Autoři: Katsuya Narumi aff001;  Tsukika Ohata aff001;  Yuichi Horiuchi aff001;  Hiroshi Satoh aff002;  Ayako Furugen aff001;  Masaki Kobayashi aff003;  Ken Iseki aff001
Působiště autorů: Laboratory of Clinical Pharmaceutics & Therapeutics, Division of Pharmasciences, Faculty of Pharmaceutical Sciences, Hokkaido University, Sapporo, Hokkaido, Japan aff001;  Research and Development Division, Hokkaido Research Institute, Nissei Bio Co. Ltd, Eniwa, Hokkaido, Japan aff002;  Department of Pharmacy, Hokkaido University Hospital, Sapporo, Hokkaido, Japan aff003
Vyšlo v časopise: PLoS ONE 14(10)
Kategorie: Research Article


2'-Deoxyadenosine 5'-monophosphate (dAMP), a deoxyribonucleotide found in DNA, affects intestinal cell growth. The molecular mechanisms underlying gastrointestinal absorption of foreign DNA ingested along with food has hardly been investigated. The aim of this study was to investigate the mechanism underlying intestinal absorption of dAMP. The uptake of [3H]dAMP by Caco-2 cells was Na+- and pH-dependent and was inhibited by various nucleosides. In contrast, nitrobenzylthioinosine (NMBPR), an equilibrative nucleoside transporter inhibitor, showed little inhibitory effects on [3H]dAMP uptake. Additionally, human concentrative nucleoside transporter (CNT) 3, transiently expressed in COS-7 cells, mediated the uptake of [3H]dAMP. A kinetic study revealed that the Km value of CNT3-mediated uptake of dAMP (59.6 μM) was close to that of 2'-deoxyadenosine (dAdo) (56.3 μM), whereas the dAMP Vmax (15.6 pmol·mg protein–1min–1) was 500-fold lesser than the dAdo Vmax (7782 pmol·mg protein–1min–1). Further, [3H]dAMP uptake was greater in COS-7 cells expressing ecto-5'-nucleotidase/CD73 with CNT3 than in those expressing CNT3 alone. These data suggest that, although dAMP is a substrate of CNT3, it is dephosphorylated to dAdo by CD73 and is efficiently absorbed as dAdo from the intestinal lumen.

Klíčová slova:

Caco-2 cells – Cell membranes – Gastrointestinal tract – Ileum – Phosphates – Purines – Nucleosides – Pyrimidines


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