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Do MRPS18-2 and RB proteins cooperate to control cell stemness and differentiation, preventing cancer development?

E Kashuba1, M Mushtaq2

  • 1R.E. Kavetsky Institute of Experimental Pathology, Oncology and Radiobiology, NAS of Ukraine, Kyiv 03022, Ukraine.

Experimental Oncology
|April 1, 2017
PubMed

Insights

High expression of RB and MRPS18-2 (S18-2) protein may drive cell stemness and cancer. Understanding their regulation is key to determining cell fate and developing new anticancer therapies.

Area of Science:

  • Cell Biology
  • Developmental Biology
  • Cancer Research

Background:

  • The RB-E2F1 pathway is typically inactivated in childhood tumors like retinoblastoma, osteosarcoma, and neuroblastoma, linked to failed terminal differentiation.
  • The role of the Retinoblastoma protein (RB) in controlling stemness and differentiation, particularly in embryonic stem cells where it doesn't regulate the cell cycle, remains unclear.
  • The necessity of "inactive" RB for cell survival and stemness raises questions about its function beyond cell cycle control.

Purpose of the Study:

  • To investigate the role of the RB-binding protein MRPS18-2 (S18-2) in cell immortalization, stemness, and malignant transformation.
  • To explore the relationship between RB and S18-2 expression levels and their combined effect on cell stemness and differentiation.
  • To uncover novel mechanisms of cell fate determination involving RB and S18-2.

Main Methods:

  • Overexpression of MRPS18-2 (S18-2) in primary fibroblasts.
  • Assessment of cell immortalization, induction of embryonic stem cell markers, and malignant transformation.
  • Analysis of RB and S18-2 expression levels in relation to cell stemness and differentiation.

Main Results:

  • Overexpression of S18-2 in primary fibroblasts induced immortalization, embryonic stem cell marker expression, and subsequent malignant transformation.
  • Cell stemness appears to be associated with high expression levels of both RB and S18-2.
  • Strict regulation of RB and S18-2 expression during embryogenesis is crucial for normal development.

Conclusions:

  • The S18-2 protein, in conjunction with RB, plays a critical role in regulating cell stemness and differentiation.
  • Dysregulation of RB and S18-2 expression can lead to developmental abnormalities.
  • S18-2 represents a potential new therapeutic target for anticancer drug development.

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