Abstract:
:Suppressors of cytokine signaling (SOCS) proteins possess common structures, a SOCS box at the C-terminus and a SH2 domain at their center. These suppressors are inducible in response to cytokines and act as negative regulators of cytokine signaling. The ASB proteins also contain the SOCS box and the ankyrin repeat sequence at the N-terminus, but do not have the SH2 domain. Although Socs genes are directly induced by several cytokines, no Asb gene inducers have been identified. In this study, we screened the specific genes expressed in the course of differentiation of HL-60 cells, and demonstrated that ASB-2, one of the ASB proteins, was rapidly induced by all-trans retinoic acid (ATRA). Typical retinoid receptors (RARs) or retinoid X receptors (RXRs) binding element (RARE/RXRE) were presented in the promoter of the Asb-2 gene. We showed that RARalpha, one of the RARs, binds to the RARE/RXRE in the Asb-2 promoter. In addition, we demonstrated by luciferase reporter assay that this element was a functional RARE/RXRE. These findings indicate that ASB-2 is directly induced by ATRA and may act as a significant regulator, underlying such physiological processes as cell differentiation.
journal_name
FEBS Lettjournal_title
FEBS lettersauthors
Kohroki J,Fujita S,Itoh N,Yamada Y,Imai H,Yumoto N,Nakanishi T,Tanaka Kdoi
10.1016/s0014-5793(01)02829-0keywords:
subject
Has Abstractpub_date
2001-09-14 00:00:00pages
223-8issue
2eissn
0014-5793issn
1873-3468pii
S0014-5793(01)02829-0journal_volume
505pub_type
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