Identification and functional characterization of mouse CD29 with a mAb

Area of Science:

• Immunology
• Cell Biology
• Molecular Biology

Background:

• The beta 1 integrin subfamily, also known as very late activation antigens (VLAs), plays a crucial role in diverse cellular processes.
• Understanding the function of these integrins is vital for various biological and medical research areas.

Purpose of the Study:

• To generate a monoclonal antibody (mAb) against the mouse beta 1 integrin subunit (CD29).
• To investigate the functional properties and inhibitory effects of this novel antibody on VLA-dependent cellular functions.

Main Methods:

• Generation of a hamster mAb, HM beta 1-1, by immunizing with mouse VLA-4 (alpha 4 beta 1) and screening against neuroblastoma C1300 cells.
• Immunoprecipitation to identify the target antigen recognized by HM beta 1-1.
• Assays to evaluate the inhibitory effect of HM beta 1-1 on VLA-dependent cell adhesion to extracellular matrix proteins and on T cell activation.

Main Results:

• HM beta 1-1 was confirmed to recognize the beta 1 subunit (CD29) of mouse integrins, indicated by its reactivity with a 110-120 kDa protein.
• The antibody effectively blocked the adhesion of mouse tumor cell lines to collagen, laminin, and fibronectin.
• HM beta 1-1, in combination with an anti-LFA-1 mAb, significantly inhibited splenic T cell proliferation and allogeneic mixed lymphocyte responses.

Conclusions:

• The generated mAb, HM beta 1-1, specifically targets mouse CD29 and inhibits VLA-dependent cellular functions.
• This antibody serves as a valuable tool for exploring the physiological roles of beta 1 integrins in vivo.
• The findings contribute to a deeper understanding of integrin-mediated cellular interactions and immune responses.