Question

Choose the correct sequence for the generation of antibodies specific for the T-cell receptor (TCR)
A. Collect monoclonal antibodies that binds to T-cell lines.
B. Add polyethylene glycol to induce fusion of antigen specific T-cells with long-lived T-cell line.
C. Culture lymph node cell T-cells with Ovalbumin (OVA)
D. Generation of a T-cell hybridoma with known antigen specificity.
E. Production of antibodies that bind to TCR on the T-cell hybridoma.

• A. A, B, C, D and E
• B. D, C, B, E and A
• C. A, B, D, E and C
• D. C, B, D, E, A

Hint:

For any hybridoma or monoclonal antibody generation protocol, always follow this fundamental logic: 1. Sensitize/Stimulate (expose to antigen) $\rightarrow$ 2. Fuse (using PEG chemical) $\rightarrow$ 3. Select/Generate stable Hybridoma $\rightarrow$ 4. Induce Production of Antibodies $\rightarrow$ 5. Harvest/Collect final product.

Answer 1

The Correct Option is D

Step 1: Concept:
This complex question outlines the standard biotechnological and immunological procedure for creating custom monoclonal antibodies specifically targeted against a particular T-Cell Receptor (TCR) using adapted hybridoma technology.

Step 2: Step-by-step Explanation:

• To successfully generate antibodies against a specific TCR, a researcher must first isolate, expand, and immortalize a pure clonal population of T-cells bearing that specific receptor.

• Step C: The protocol begins by activating the desired cells. Lymph node cells are harvested and cultured in vitro with a known, specific antigen, such as Ovalbumin (OVA). This stimulates the activation and proliferation of only those T-cells with a TCR specific to OVA.

• Step B: Primary T-cells die quickly in standard culture. Therefore, they must be immortalized. A chemical agent called Polyethylene glycol (PEG) is added to the culture to induce the physical cell membrane fusion of these specific primary T-cells with a cancerous, long-lived T-cell tumor line (lymphoma line).

• Step D: If the fusion is successful and selected properly, this results in the generation of a T-cell hybridoma. This hybrid cell now possesses both the desired OVA-specific TCR (from the normal cell) and the ability to divide infinitely (from the tumor cell).

• Step E: This stable hybridoma is now used as an immunogen. It is typically injected into a host animal (like a mouse) to trigger the animal's immune system into the production of antibodies that recognize and bind directly to the unique TCR on the surface of the injected hybridoma cells.

• Step A: Finally, B-cells from the immunized animal are harvested, run through standard antibody-hybridoma generation, allowing researchers to isolate, purify, and collect monoclonal antibodies that specifically bind to the original T-cell line.

• Following this strict biological logic, the chronologically accurate sequence is absolutely C $\rightarrow$ B $\rightarrow$ D $\rightarrow$ E $\rightarrow$ A.

• Note: Upon reviewing the given multiple-choice options (A, B, C, and D), none of them present this correct sequence. The question likely contains a typographical error from the examiners, but the sequence explained above is the only scientifically valid method.

Step 3: Final Answer:
The scientifically correct sequence is C, B, D, E, A.