Antisense oligodeoxynucleotides as probes of T-lymphocyte gene function

Area of Science:

• Immunology
• Molecular Biology
• Gene Regulation

Background:

• T-cell hybridomas are crucial for studying immune responses.
• Gene expression regulation is key to understanding T-cell function.
• Antisense oligonucleotides offer a method for targeted gene silencing.

Purpose of the Study:

• To investigate the use of antisense oligonucleotides for regulating gene expression in T-cell hybridomas.
• To explore the role of protooncogenes (c-myc, c-fos) in T-cell activation and apoptosis.
• To examine the relationship between T-cell receptor (TCR) expression and T-cell-derived regulatory factors.

Main Methods:

• Utilized conventional and thiophosphonate-derivatized antisense oligonucleotides.
• Targeted specific protooncogenes (c-myc, c-fos) and T-cell receptor (TCR) genes (V alpha, V beta, CD3 gamma, CD3 zeta).
• Assessed effects on DNA fragmentation, cell viability, lymphokine production, and soluble regulatory activity.

Main Results:

• Antisense oligonucleotides against c-myc inhibited T-cell hybridoma apoptosis without affecting lymphokine production.
• Antisense oligonucleotides against c-fos did not impact T-cell hybridoma function.
• Cell-specific antisense oligonucleotides targeting TCR V alpha/V beta demonstrated their utility.
• Blocking CD3-TCR complex expression did not affect soluble regulatory activity production.

Conclusions:

• Antisense oligonucleotides are effective tools for regulating gene expression and function in T-cell hybridomas.
• c-myc plays a role in T-cell apoptosis following activation.
• TCR expression is essential for certain antigen-specific regulatory activities, as confirmed by antisense studies and gene transfer.