NDLI: Soluble Ecto-5′-nucleotidase (5′-NT), Alkaline Phosphatase, and Adenosine Deaminase (ADA1) Activities in Neonatal Blood Favor Elevated Extracellular $Adenosine^{*}$ $^{}$

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Soluble Ecto-5′-nucleotidase (5′-NT), Alkaline Phosphatase, and Adenosine Deaminase (ADA1) Activities in Neonatal Blood Favor Elevated Extracellular $Adenosine^{*}$ $^{}$

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Soluble Ecto-5′-nucleotidase (5′-NT), Alkaline Phosphatase, and Adenosine Deaminase (ADA1) Activities in Neonatal Blood Favor Elevated Extracellular $Adenosine^{*}$ $^{}$

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Burl, Sarah Kampmann, Beate Bergelson, Ilana Millán, José Luis Bingham, Taiese Belderbos, Mirjam Tresenriter, Megan Robson, Simon Levy, Ofer Kollmann, Tobias Gelinas, Laura Bont, Louis Pettengill, Matthew Usheva, Anny
Description	Author Affiliation: Pettengill M ( From the Department of Medicine, Division of Infectious Diseases, Boston Children's Hospital, Boston, Massachusetts 02115.)
Abstract	Extracellular adenosine, a key regulator of physiology and immune cell function that is found at elevated levels in neonatal blood, is generated by phosphohydrolysis of adenine nucleotides released from cells and catabolized by deamination to inosine. Generation of adenosine monophosphate (AMP) in blood is driven by cell-associated enzymes, whereas conversion of AMP to adenosine is largely mediated by soluble enzymes. The identities of the enzymes responsible for these activities in whole blood of neonates have been defined in this study and contrasted to adult blood. We demonstrate that soluble 5′-nucleotidase (5′-NT) and alkaline phosphatase (AP) mediate conversion of AMP to adenosine, whereas soluble adenosine deaminase (ADA) catabolizes adenosine to inosine. Newborn blood plasma demonstrates substantially higher adenosine-generating 5′-NT and AP activity and lower adenosine-metabolizing ADA activity than adult plasma. In addition to a role in soluble purine metabolism, abundant AP expressed on the surface of circulating neonatal neutrophils is the dominant AMPase on these cells. Plasma samples from infant observational cohorts reveal a relative plasma ADA deficiency at birth, followed by a gradual maturation of plasma ADA through infancy. The robust adenosine-generating capacity of neonates appears functionally relevant because supplementation with AMP inhibited whereas selective pharmacologic inhibition of 5′-NT enhanced Toll-like receptor-mediated TNF-α production in neonatal whole blood. Overall, we have characterized previously unrecognized age-dependent expression patterns of plasma purine-metabolizing enzymes that result in elevated plasma concentrations of anti-inflammatory adenosine in newborns. Targeted manipulation of purine-metabolizing enzymes may benefit this vulnerable population.
ISSN	00219258
e-ISSN	1083351X
Journal	Journal of Biological Chemistry
Issue Number	38
Volume Number	288
Language	English
Publisher	American Society for Biochemistry and Molecular Biology (United States)
Publisher Date	2013-09-20
Publisher Place	United States
Access Restriction	Open
Subject Keyword	5'-Nucleotidase Blood Adenosine Deaminase Adenosine Aging Alkaline Phosphatase Gene Expression Regulation, Enzymologic Physiology Infant, Newborn Inosine Clinical Trial Research Support, N.I.H., Extramural Research Support, Non-U.S. Gov't Biochemistry Molecular Biology
Content Type	Text
Resource Type	Article
Subject	Cell Biology Biochemistry Molecular Biology

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