Basally located epithelial cell surface component identified by a novel monoclonal antibody technique

Area of Science:

• Cell Biology
• Immunology
• Epithelial Biology

Background:

• Human endometrial glandular epithelial cells form tubular aggregates.
• Collagenase digestion isolates these aggregates, exposing basal cell surfaces.
• Basally located antigens on epithelial cells are of significant biological interest.

Purpose of the Study:

• To derive monoclonal antibodies recognizing basally located epithelial antigens.
• To characterize a specific antibody, G71, and its target antigen.
• To investigate the distribution and molecular characteristics of the antigen.

Main Methods:

• Isolation of human endometrial gland fragments using collagenase digestion.
• Immunization of mice with isolated cell aggregates to generate monoclonal antibodies.
• Characterization of antibody G71 binding specificity and epitope-bearing molecule size.

Main Results:

• Monoclonal antibody G71 was successfully derived.
• G71 recognizes a basal epithelial cell antigen present in diverse human epithelia.
• Epitope-bearing molecules (Mr 60,000-180,000) were identified in amnion and endometrium.
• The epitope is associated with epithelial cell-extracellular matrix contact sites.

Conclusions:

• Monoclonal antibody G71 is a valuable tool for studying basal epithelial cell antigens.
• The identified antigen is conserved across various human epithelial tissues.
• The antigen's localization suggests a role in epithelial cell adhesion and interaction with the extracellular matrix.