Alternative splicing of the RAGE cytoplasmic domain regulates cell signaling and function

Area of Science:

• Cellular biology
• Molecular biology
• Cancer research

Background:

• The Receptor for Advanced Glycation End-products (RAGE) is implicated in various diseases.
• Alternative splicing regulates RAGE signaling via soluble isoforms.
• No intracellular RAGE splice variants were previously identified.

Purpose of the Study:

• To identify and characterize novel splice variants of RAGE within its intracellular domain.
• To investigate the functional impact of a novel truncated intracellular domain variant (RAGEΔICD) on RAGE signaling and cancer cell behavior.

Main Methods:

• Cloning and characterization of the novel RAGEΔICD splice variant.
• Expression of RAGEΔICD in C6 glioma cells.
• Analysis of RAGE-ligand induced MAP kinase pathways (ERK1/2, p38, SAPK/JNK).
• Assessment of cell migration, invasion, adhesion, and viability.
• Soft agar assays to evaluate tumorigenesis.

Main Results:

• A novel RAGE splice variant with a truncated intracellular domain (RAGEΔICD) was identified and characterized.
• RAGEΔICD is expressed in various human and mouse tissues.
• Expression of RAGEΔICD in glioma cells inhibited RAGE-ligand induced MAP kinase signaling.
• RAGEΔICD significantly altered glioma cell migration, invasion, adhesion, and viability.
• RAGEΔICD expression drastically inhibited glioma cell tumorigenesis in soft agar assays.

Conclusions:

• RAGEΔICD is a novel endogenous mechanism for regulating RAGE signaling.
• RAGEΔICD downregulates RAGE signaling pathways.
• RAGEΔICD may play a significant role in RAGE-associated pathological conditions by modulating RAGE signaling.