1.Principle of Rabbit Single B Cell Technology

Rabbit single B cell technology is a recently developed method for the rapid production of monoclonal antibodies. This technique involves isolating and cloning B cells from rabbits to generate highly specific antibodies from a single source.The process of single B cell antibody production is based on fluorescence-activated cell sorting (FACS). Each B cell contains only one functional heavy-chain variable region (VH) DNA sequence and one light-chain variable region (VL) DNA sequence, enabling it to produce only one specific antibody. B cells are collected from rabbit lymphoid tissues, and the VH and VL genes are amplified from individual antibody-secreting B cells using monoclonal cloning techniques. This allows the isolated B cells to be expanded into a clonal population of single-origin antibodies. Subsequently, a suitable antibody production host is selected to generate rabbit monoclonal antibodies.Single B cell technology offers significant advantages, including high specificity, high activity, and high affinity. Currently, antibodies produced using this method are widely applied in biomedical research, diagnostic tools, and therapeutic drug development.

Figure 1: Flowchart of Rabbit Monoclonal Antibody Production

2. Antibody Production Process Using Rabbit Single B-Cell Technology

① Animal Immunization and PBMC Isolation. Rabbits are selected as experimental animals and immunized with the target antigen (typically a protein or peptide) to induce an immune response. The rabbits receive 4–5 immunizations to activate their immune system, prompting B cells to produce antibodies. Subsequently, ELISA titer determination is performed, followed by peripheral blood collection and PBMC isolation from the immunized rabbits.

② Flow Cytometry Sorting. Antigen-specific single B cells are isolated using fluorescence-activated cell sorting (FACS) from the PBMCs.

③ Single B-Cell Culturing and Screening. The sorted single B cells are cultured in vitro using 5–20 96-well plates. The cell culture supernatants are then screened via ELISA or preliminary FACS-based detection.

④ Sequencing of Positive Clones. At least 20 positive B-cell clones are selected for RT-PCR to amplify their antibody variable region genes, followed by sequencing.

⑤ Vector Construction, Antibody Expression, and Purification. Finally, mammalian expression vectors are constructed for antibody production, followed by cell transfection and ELISA validation.

Figure 2: Flowchart of Rabbit Single B-Cell Antibody Production Technology

3. Advantages of Monoclonal Antibody Production from Single B Cells

The rabbit single B cell technology enables rapid production of monoclonal antibodies based on B cell characteristics, directly obtaining complete single-source antibodies. This method is not restricted by species, offers high efficiency, high specificity, high antibody affinity, high druggability, excellent genetic diversity, and full natural origin. Additionally, it allows direct acquisition of antibody gene sequences.

4. Applications of Rabbit Single B-Cell Technology

Antibodies produced using rabbit single B-cell technology are widely applied in the following four areas:

① Drug Development. Antibodies generated by this technology can be used in the development of novel drugs, particularly showing great potential in the field of cancer therapy.

② Vaccine Development. These antibodies can enhance the efficacy and specificity of vaccines.

③ Immunotherapy. Antibodies produced via rabbit single B-cell technology can be utilized in immunotherapies, offering more personalized treatment options for patients.

④ Basic Medical Research. Due to their high specificity and diversity, these antibodies are valuable tools for studying biological processes and disease mechanisms.

5. Services and Advantages Offered by KMD Bioscience

KMD Bioscience boasts extensive experience and a stringent quality control system. Our rabbit single B cell antibody development service features a short turnaround time, no species restrictions, and the ability to obtain antibody sequences, resulting in antibodies with higher specificity and affinity. To meet diverse client needs, KMD Bioscience provides comprehensive one-stop technical services, ranging from antigen design, synthesis, and modification to animal immunization, phage library construction and screening, as well as downstream antibody modification and application validation.