Abstract:
:Natural killer (NK) cells contribute to host immunity, including tumor surveillance, through the production of interferon gamma (IFN-gamma). Although there is some knowledge about molecular mechanisms that induce IFN-gamma in NK cells, considerably less is known about the mechanisms that reduce its expression. Here, we investigate the role of the Hlx transcription factor in IFN-gamma production by NK cells. Hlx expression is induced in monokine-activated NK cells, but with delayed kinetics compared to IFN-gamma. Ectopic Hlx expression decreases IFN-gamma synthesis in primary human NK cells and IFN-gamma promoter activity in an NK-like cell line. Hlx protein levels inversely correlate with those of STAT4, a requisite factor for optimal IFN-gamma transcription. Mechanistically, we provide evidence indicating that Hlx overexpression accelerates dephosphorylation and proteasome-dependent degradation of the active Y693-phosphorylated form of STAT4. Thus, Hlx expression in activated NK cells temporally controls and limits the monokine-induced production of IFN-gamma, in part through the targeted depletion of STAT4.
journal_name
Bloodjournal_title
Bloodauthors
Becknell B,Hughes TL,Freud AG,Blaser BW,Yu J,Trotta R,Mao HC,Caligiuri de Jesús ML,Alghothani M,Benson DM Jr,Lehman A,Jarjoura D,Perrotti D,Bates MD,Caligiuri MAdoi
10.1182/blood-2006-10-050096subject
Has Abstractpub_date
2007-03-15 00:00:00pages
2481-7issue
6eissn
0006-4971issn
1528-0020pii
blood-2006-10-050096journal_volume
109pub_type
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