Abstract:
:1. The retinoblastoma susceptibility gene product, p105Rb (RB), is an important regulator in the control of cell proliferation, differentiation, and apoptosis. Several cellular factors that complex with RB and exert their cellular regulatory functions have been identified, such as the RB:cyclophilin A (CypA) complex. 2. CypA is a cytoplasmic immunophilin and known for its involvement in T-cell differentiation and proliferation. Although CypA has a pivotal role in the immune response, its function in other signaling pathways is largely unknown. 3. In this study, we used a model of neuronal differentiation to demonstrate that the nuclear translocation of CypA, the appearance of hypophosphorylated RB and the enhancement of RB: CypA complex formation correlates with retinoic acid induced neuronal differentiation. 4. Inhibition of CypA expression results in repression of both the hypophosphorylated RB and the neuron-specific differentiation marker, class III beta tubulin. 5. The evidence of enriched CypA and colocalization of RB with CypA in the nucleus of primary adult sensory neurons substantiated the important event of RB-mediated neuronal differentiation of p19 EC cells.
journal_name
Cell Mol Neurobioljournal_title
Cellular and molecular neurobiologyauthors
Chiu R,Rey O,Zheng JQ,Twiss JL,Song J,Pang S,Yokoyama KKdoi
10.1023/b:cemn.0000005321.11544.ccsubject
Has Abstractpub_date
2003-12-01 00:00:00pages
929-43issue
6eissn
0272-4340issn
1573-6830journal_volume
23pub_type
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