WNT5A encodes two isoforms with distinct functions in cancers.

Area of Science:

• Molecular Biology
• Cancer Research
• Developmental Biology

Background:

• WNT5A is a secreted glycoprotein involved in development and cancer, with dual roles.
• Its opposing functions in different cancers suggest underlying molecular mechanisms are not fully understood.

Purpose of the Study:

• To investigate the differential roles of WNT5A protein isoforms in cancer.
• To elucidate the mechanism behind WNT5A's context-dependent tumor suppressive or promoting activities.

Main Methods:

• Protein isoform characterization using N-terminal sequencing and specific antibodies.
• Biochemical analysis of WNT5A-L and WNT5A-S stability, hydrophobicity, and signaling.
• Functional assays (ectopic expression, knockdown) in cancer cell lines.
• Analysis of WNT5A isoform expression in clinical tumor samples.

Main Results:

• WNT5A gene produces two distinct isoforms: WNT5A-long (WNT5A-L) and WNT5A-short (WNT5A-S).
• WNT5A-L inhibits tumor cell proliferation, whereas WNT5A-S promotes it.
• WNT5A-L is downregulated and WNT5A-S is overexpressed in breast, cervix, and neuroblastoma tumors.

Conclusions:

• Distinct activities of WNT5A in cancer are attributed to the differential production of WNT5A-L and WNT5A-S isoforms.
• This isoform-specific regulation offers a new perspective on WNT5A's role in tumorigenesis and progression.