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Sequential expression of new gene programs in inducer T-cell clones
Abstract:
We have prepared a cDNA probe that detects genes that are rapidly and abundantly expressed after exposure of inducer T-lymphocyte clones to antigen or mitogen. All inducer cells tested express a characteristic set of new mRNA, and these mRNAs are not expressed after activation of other lymphocytes. This initial burst of mRNA synthesis is paralleled by synthesis and secretion of a family of polypeptides that mediate inducer cell activity, including T- and B-cell growth factors, interferon, and molecules that bind to antigen. Expression of this initial genetic program precedes mitosis and is replaced within 74 hr by a different genetic program, which may control further cell division. The action of these sequential sets of genetic programs defines two stages of the cell's differentiation and accounts for altered expression of the cell's immunological functions.
Insights
Researchers identified a specific set of genes activated in T-lymphocyte clones upon antigen exposure. This gene expression drives early immune cell activity and differentiation.
Area of Science:
- Immunology
- Molecular Biology
- Cell Biology
Background:
- T-lymphocyte clones are crucial for adaptive immunity.
- Understanding gene expression dynamics is key to deciphering immune responses.
Purpose of the Study:
- To identify and characterize genes rapidly expressed in T-lymphocyte clones upon activation.
- To investigate the role of these genes in early T-cell differentiation and function.
Main Methods:
- Preparation of a cDNA probe to detect gene expression.
- Exposure of T-lymphocyte clones to antigen or mitogen.
- Analysis of mRNA and polypeptide synthesis.
Main Results:
- A specific set of mRNAs and polypeptides are rapidly expressed in T-lymphocyte clones after antigen/mitogen exposure.
- These molecules include growth factors, interferon, and antigen-binding molecules.
- Gene expression occurs in two sequential programs, preceding and following mitosis.
Conclusions:
- Early T-cell activation involves a distinct genetic program driving immediate effector functions.
- Sequential gene expression programs regulate T-lymphocyte differentiation and immunological function.