Evidence that tristetraprolin is a physiological regulator of granulocyte-macrophage colony-stimulating factor messenger RNA deadenylation and stability
E. Carballo et al., Evidence that tristetraprolin is a physiological regulator of granulocyte-macrophage colony-stimulating factor messenger RNA deadenylation and stability, BLOOD, 95(6), 2000, pp. 1891-1899
Deficiency of tristetraprolin (TTP), the prototype of the CCCH zinc finger
proteins, results in a complex inflammatory syndrome in mice. Most aspects
of the syndrome are secondary to excess circulating tumor necrosis factor (
TNF)-alpha, a consequence of increased stability of TNF-alpha messenger RNA
(mRNA) in TTP-deficient macrophages. TTP can bind directly to the AU-rich
element in TNF-alpha mRNA, increasing its lability, Here we show that TTP d
eficiency also results in increased cellular production of granulocyte-macr
ophage colony-stimulating factor (GM-CSF) and increased stability of its mR
NA, apparently secondary to decreased deadenylation. Similar findings were
observed in mice also lacking both types of TNF-alpha receptors, excluding
excess TNF-alpha production as a cause of the increased GM-CSF mRNA levels
and stability. TTP appears to be a physiological regulator of GM-CSF mRNA d
eadenylation and stability. (C) 2000 by The American Society of Hematology.