Targeting the Chromosomal Passenger Complex Subunit INCENP Induces Polyploidization, Apoptosis, and Senescence in...

Area of Science:

• Oncology
• Molecular Biology
• Cancer Genetics

Background:

• The chromosomal passenger complex (CPC) is a potential cancer therapeutic target, but direct inhibition of its components like Aurora B or survivin has limitations.
• Neuroblastoma cells exhibit particular vulnerability to the loss of INCENP, a crucial scaffolding protein within the CPC.
• INCENP expression is elevated in neuroblastoma and inversely correlates with retinoic acid-induced differentiation.

Purpose of the Study:

• To investigate the role of INCENP in neuroblastoma tumorigenesis and its potential as a therapeutic target.
• To evaluate the impact of INCENP depletion on neuroblastoma cell growth, differentiation, and patient prognosis.

Main Methods:

• Analysis of INCENP expression in neuroblastoma patient tumors and cell lines.
• Genetic silencing of INCENP using siRNA in vitro and in vivo neuroblastoma models.
• Assessment of cell proliferation, apoptosis, polyploidization, senescence, and DNA damage response pathways.

Main Results:

• High INCENP expression is linked to poor prognosis in high-risk neuroblastoma.
• INCENP silencing significantly inhibited neuroblastoma cell growth in vitro and xenograft growth in vivo, improving survival.
• INCENP depletion induced polyploidization, apoptosis, and senescence, primarily through DNA damage response and p53-p21 activation.

Conclusions:

• INCENP is a critical driver of neuroblastoma progression and a viable therapeutic target.
• Targeting INCENP offers a novel strategy to disrupt CPC activity and inhibit neuroblastoma tumor growth.
• Understanding INCENP's role provides new avenues for developing targeted therapies for neuroblastoma.