Pan-cancer ion transport signature reveals functional regulators of glioblastoma aggression

Area of Science:

• Oncology
• Molecular Biology
• Biophysics

Background:

• The ion permeome, comprising ion channels and transporters, represents a largely untapped resource for cancer drug discovery.
• While ion channels are established drug targets, their specific roles and dysregulation in various cancers are not well understood.

Purpose of the Study:

• To conduct a pan-cancer analysis of the ion permeome to identify potential therapeutic targets.
• To investigate the prognostic significance of ion permeome genes in different cancer types, particularly glioblastoma.

Main Methods:

• Integrative pan-cancer transcriptome analysis to identify highly expressed ion permeome genes.
• Machine-learning approach to identify 410 survival-associated ion permeome genes across 33 cancer types.
• Functional studies involving gene knockdown (GJB2, SCN9A) in patient-derived glioblastoma cells and in vivo mouse models.

Main Results:

• Genes encoding the ion permeome are significantly overexpressed in specific cancer subsets.
• GJB2 and SCN9A are highly expressed in glioblastoma, correlating with poor prognosis.
• Knockdown of GJB2/SCN9A in glioblastoma cells altered gene expression, reduced viability and tumor formation, and extended mouse survival.

Conclusions:

• Aberrant ion transport protein gene expression is a pan-cancer feature contributing to tumor heterogeneity.
• The ion permeome presents a promising avenue for developing novel cancer therapies.
• Targeting specific ion channels like GJB2 and SCN9A may offer new treatment strategies for aggressive cancers such as glioblastoma.