Domain-specific CCN3 antibodies as unique tools for structural and functional studies

Area of Science:

• Cellular and Molecular Biology
• Oncology
• Protein Biochemistry

Background:

• CCN3 is a key regulator of cell growth and differentiation, implicated in embryonic development and human pathologies.
• Altered CCN gene expression has prognostic value in various cancers, with truncated variants linked to tumorigenesis.

Purpose of the Study:

• To develop and characterize module-specific antibodies against human CCN3 protein.
• To enable detection and localization of full-length and truncated CCN3 variants.

Main Methods:

• Expression of individual CCN3 modules as GST fusion proteins for rabbit immunization.
• Purification of polyclonal IgGs via affinity chromatography.
• Application of antibodies in Western blotting, immunoprecipitation, immunofluorescence, and immunocytochemistry.

Main Results:

• Module-specific antibodies specifically detected CCN3 domains, full-length, and truncated CCN3 proteins in various contexts.
• Antibodies confirmed CCN3 sublocalization in extracellular, cell membrane, cytoplasmic, and nuclear compartments.
• Truncated CCN3 proteins were identified in kidney tumor samples, suggesting their role in tumorigenesis.

Conclusions:

• The developed module-specific antibodies are valuable tools for identifying truncated CCN3 proteins in human tissues.
• These antibodies offer potential applications in molecular medicine and cancer diagnostics.