Abstract:
:The present study investigated the role of adenosine in the stimulatory action of paeoniflorin on in vitro glucose transport. Paeoniflorin increased the uptake of a radiolabeled, non-metabolizable glucose derivative into isolated white adipocytes of Wistar rat in a concentration-dependent manner and this action was abolished by the antagonist, 8-cyclopentyltheophylline, at concentrations sufficient to block the adenosine A 1 receptor. However, paeoniflorin failed to displace the binding of [3H]-8-cyclopentyl-1,3-dipropylxanthine in the isolated cerebrocortex of Wistar rat. Direct activation of the adenosine A 1 receptor does not seem to be responsible for the action of paeoniflorin. The stimulatory effect of paeoniflorin on radioactive glucose uptake was abolished in isolated rat white adipocytes pre-incubated with the adenosine deaminase at concentrations sufficient to metabolize endogenous adenosine. Mediation of endogenous adenosine in the action of paeoniflorin was further supported by the assay of adenosine released into the medium from rat white adipocytes incubated with paeoniflorin. These findings suggest that paeoniflorin could induce the release of adenosine from isolated rat white adipocytes and the released adenosine may activate the adenosine A 1 receptor to enhance glucose uptake.
journal_name
Planta Medjournal_title
Planta medicaauthors
Tang LM,Liu IM,Cheng JTdoi
10.1055/s-2003-38878subject
Has Abstractpub_date
2003-04-01 00:00:00pages
332-6issue
4eissn
0032-0943issn
1439-0221journal_volume
69pub_type
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