Abstract：
:The retinoblastoma susceptibility gene product, p105Rb (RB), is generally believed to be an important regulator in the control of cell growth, differentiation, and apoptosis. Several cellular factors that form complexes with RB and exert their cellular regulatory functions have been identified, such as the newly identified RB:cyclophilin A (CypA) complex. The physical interactions between RB and CypA were demonstrated by glutathione S-transferase affinity matrix binding assays and immunoprecipitation, followed by Western blot analyses. The N-terminal region of CypA mediated the interaction with RB, whereas the region upstream of the A-pocket of RB was required for binding to CypA. Ectopic expression of RB into Jurkat cells partially blocks the function of cyclosporin (CsA) to inhibit nuclear factor for activation of T cell (NFAT) activation by phorbol ester (PMA) plus ionomycin A (IA), suggesting that RB may prevent CsA inhibition of T lymphocyte activation. These results are further evidenced by the effect of RB on both calcineurin (CN) and NFAT binding activity in vitro, suggesting that the interaction of RB with CypA interferes with the CsA:CypA complex and blocks CsA-inhibited CN activity. These data reveal the functional link between RB and CypA and their involvement in T cell activation signaling.
journal_name
J Cell Biochemjournal_title
Journal of cellular biochemistryauthors
Cui Y,Mirkia K,Florence Fu YH,Zhu L,Yokoyama KK,Chiu Rdoi
10.1002/jcb.10253subject
Has Abstractpub_date
2002-01-01 00:00:00pages
630-41issue
4eissn
0730-2312issn
1097-4644journal_volume
86pub_type
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