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A binding domain on mesothelin for CA125/MUC16.

Osamu Kaneko¹, Lucy Gong, Jingli Zhang

¹Laboratory of Molecular Biology, Center for Cancer Research, NCI, National Institutes of Health, Bethesda, Maryland 20892, USA.

The Journal of Biological Chemistry

|December 17, 2008

Summary

Researchers identified the specific region on mesothelin (296-359) responsible for binding to CA125 (MUC16). This mesothelin-CA125 interaction domain blocks tumor cell adhesion and shows potential as a therapeutic agent for peritoneal cancers.

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Desthiobiotin-Streptavidin-Affinity Mediated Purification of RNA-Interacting Proteins in Mesothelioma Cells

Desthiobiotin-Streptavidin-Affinity Mediated Purification of RNA-Interacting Proteins in Mesothelioma Cells

Published on: April 25, 2018

Area of Science:

Oncology
Molecular Biology
Immunology

Background:

Ovarian cancer and malignant mesothelioma overexpress mesothelin and CA125 (MUC16).
Mesothelin-CA125 interaction is implicated in tumor implantation and peritoneal spread.
The precise binding site and nature of this interaction remain largely undefined.

Purpose of the Study:

To identify the specific binding site of mesothelin for CA125.
To characterize the molecular interaction between mesothelin and CA125.
To evaluate the therapeutic potential of the identified binding domain.

Main Methods:

Truncated mutagenesis and alanine replacement techniques were employed.
Molecular interactions were analyzed using Western blot overlay assays and ELISA.
Binding on cancer cells was assessed via flow cytometry.

Main Results:

The N-terminal region (296-359) of mesothelin was identified as the minimal binding site for CA125.
Tyrosine 318 substitution abolished CA125 binding; substitutions at Trp321 and Glu324 partially decreased binding.
A single-chain antibody (SS1) targeting this domain blocked mesothelin-CA125 interaction on cancer cells, inhibiting adhesion.

Conclusions:

A conformation-sensitive region (296-359) on mesothelin is necessary and sufficient for CA125 binding.
This identified domain effectively inhibits cancer cell adhesion.
The mesothelin-CA125 binding domain is a promising candidate for novel therapeutic strategies against peritoneal tumors.