T. Hoff et al., PROSTAGLANDIN ENDOPEROXIDE SYNTHASE-1 AND SYNTHASE-2 EXPRESSION IN DIFFERENTIATING HUMAN MONOCYTIC CELLS, Agents and actions, 41, 1994, pp. 30000159-30000161
Upon treatment with the phorbol ester TPA human myeloid leukemia U-937
cells acquire a macrophage-like phenotype including the capacity to m
etabolize arachidonate to prostanoids. We investigated the differentia
tion-associated expression of the key enzyme of prostanoid synthesis f
rom arachidonate, prostaglandin endoperoxide synthase (PGHS). Our resu
lts of Western and Northern blot analyses indicate that the previously
found 5-10-fold induction of PGHS activity during differentiation is
due to enhanced expression of both currently known PGHS isoforms. In t
his system PGHS-2 differs from PGHS-1 in its time course of induction,
its sensitivity to glucocorticoid suppression and its more extensive
and heterogeneous glycosylation.