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2015 ; 12
(1
): 107-12
Nephropedia Template TP
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English Wikipedia
The plant hormone zeatin riboside inhibits T lymphocyte activity via adenosine
A2A receptor activation
#MMPMID24813229
Lappas CM
Cell Mol Immunol
2015[Jan]; 12
(1
): 107-12
PMID24813229
show ga
Cytokinins are plant hormones that play an integral role in multiple aspects of
plant growth and development. The biological functions of cytokinins in mammalian
systems are, however, largely uncharacterized. The naturally occurring cytokinin
zeatin riboside has recently been demonstrated to activate the mammalian
adenosine A(2A) receptor, which is broadly expressed by various cell types
including immune system cells, with the activation of the A(2A)R playing a role
in the regulation of cells involved in both innate and adaptive immunity. We show
for the first time that zeatin riboside modulates mammalian immune system
activity via an A(2A)R-dependent mechanism. Specifically, zeatin riboside
treatment induces the production of cyclic adenosine monophosphate (cAMP) by T
lymphocytes and inhibits the production by CD3(+)CD4(+) T cells of interferon
(IFN)-?, IL-2, tumor-necrosis factor (TNF)-?, IL-4 and IL-13, and the production
by CD3(+)CD8(+) T cells of IFN-?, IL-2 and TNF-?. Additionally, the upregulation
of CD25, CD69 and CD40L by activated T lymphocytes is modulated by zeatin
riboside. Zeatin riboside treatment also potently inhibits thioglycollate-induced
peritoneal leukocytosis. The immunomodulatory activities of zeatin riboside are
blocked by co-treatment with the selective A(2A)R antagonist ZM241385. These data
suggest that zeatin riboside possesses therapeutic potential as a mammalian
immunomodulatory agent.