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Molecular and Cellular Biology, July 1999, p. 4980-4988, Vol. 19, No. 7
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
SOCS-3 Is Tyrosine Phosphorylated in Response to
Interleukin-2 and Suppresses STAT5 Phosphorylation and
Lymphocyte Proliferation
Solomon J.
Cohney,1
David
Sanden,1
Nicholas A.
Cacalano,1
Akihiko
Yoshimura,2
Alice
Mui,1
Thi Sau
Migone,1 and
James A.
Johnston1,*
DNAX Research Institute, Palo Alto,
California 94304,1 and Institute of Life
Science, Kurume University, 2432-3 Aikawa-machi, Kurume, 839-0861 Japan2
Received 7 January 1999/Returned for modification 4 March
1999/Accepted 15 April 1999
Members of the recently discovered SOCS/CIS/SSI family have been
proposed as regulators of cytokine signaling, and while targets and
mechanisms have been suggested for some family members, the precise
role of these proteins remains to be defined. To date no SOCS proteins
have been specifically implicated in interleukin-2 (IL-2) signaling in
T cells. Here we report SOCS-3 expression in response to IL-2 in both
T-cell lines and human peripheral blood lymphocytes. SOCS-3 protein was
detectable as early as 30 min following IL-2 stimulation, while CIS was
seen only at low levels after 2 h. Unlike CIS, SOCS-3 was rapidly
tyrosine phosphorylated in response to IL-2. Tyrosine phosphorylation
of SOCS-3 was observed upon coexpression with Jak1 and Jak2 but only
weakly with Jak3. In these experiments, SOCS-3 associated with Jak1 and
inhibited Jak1 phosphorylation, and this inhibition was markedly
enhanced by the presence of IL-2 receptor beta chain (IL-2R
).
Moreover, following IL-2 stimulation of T cells, SOCS-3 was able to
interact with the IL-2 receptor complex, and in particular tyrosine
phosphorylated Jak1 and IL-2R
. Additionally, in lymphocytes
expressing SOCS-3 but not CIS, IL-2-induced tyrosine phosphorylation of
STAT5b was markedly reduced, while there was only a weak effect on
IL-3-mediated STAT5b tyrosine phosphorylation. Finally, proliferation
induced by both IL-2- and IL-3 was significantly inhibited in the
presence of SOCS-3. The findings suggest that when SOCS-3 is rapidly
induced by IL-2 in T cells, it acts to inhibit IL-2 responses in a
classical negative feedback loop.
*
Corresponding author. Mailing address: DNAX Research
Institute, 901 California Ave., Palo Alto, CA 94304. Phone: (650)
858-7508. Fax: (650) 496-1200. E-mail: Johnston{at}dnax.org.
Molecular and Cellular Biology, July 1999, p. 4980-4988, Vol. 19, No. 7
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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