title: Role of the RB-Interacting Proteins in Stem Cell Biology.
abstract: Human retinoblastoma gene RB1 is the first tumor suppressor gene (TSG) isolated by positional cloning in 1986. RB is extensively studied for its ability to regulate cell cycle by binding to E2F1 and inhibiting the transcriptional activity of the latter. In human embryonic stem cells (ESCs), only a minute trace of RB is found in complex with E2F1. Increased activity of RB triggers differentiation, cell cycle arrest, and cell death. On the other hand, inactivation of the entire RB family (RB1, RBL1, and RBL2) in human ESC induces G2/M arrest and cell death. These observations indicate that both loss and overactivity of RB could be lethal for the stemness of cells. A question arises why inactive RB is required for the survival and stemness of cells? To shed some light on this question, we analyzed the RB-binding proteins. In this review we have focused on 27 RB-binding partners that may have potential roles in different aspects of stem cell biology.
authors.affiliation: Karolinska Institutet, Stockholm, Sweden.
authors.forename: M
authors.initials: M
authors.lastname: Mushtaq
authors.affiliation: Karolinska Institutet, Stockholm, Sweden.
authors.forename: H Viñas
authors.initials: HV
authors.lastname: Gaza
authors.affiliation: Karolinska Institutet, Stockholm, Sweden; R.E. Kavetsky Institute of Experimental Pathology, Oncology and Radiobiology, NASU, Kyiv, Ukraine. Electronic address: elena.kashuba@ki.se.
authors.forename: E V
authors.initials: EV
authors.lastname: Kashuba
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D006801:Humans; D009369:Neoplasms / Q000503:physiopathology*; D060066:Protein Interaction Maps; D016160:Retinoblastoma Protein / Q000378:metabolism*; D013234:Stem Cells / Q000378:metabolism* / Q000473:pathology*
chemical_list: D016160:Retinoblastoma Protein
keywords: Cell cycle in stem cells; Cell differentiation; Cell stemness; MRPS18-2; Protein–protein binding; RB-binding proteins; Retinoblastoma protein