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A single peptide derived from the sequence common to polyoma small and middle T-antigen induces immunity against
T Ramqvist1, G Reinholdsson, M Carlquist
1Department of Tumor Biology, Karolinska Institute, Stockholm, Sweden.
Abstract:
Polyoma virus, an oncogenic virus, fails to induce tumors in immunocompetent rodents due to T cell-dependent mechanisms. The target recognized by the immune system has been functionally defined as polyoma tumor-specific transplantation antigen (TSTA) and has been postulated to be related to the virus three early proteins small T (ST), middle T (MT), and large T (LT) antigens. We show here that immunization with a synthetic peptide corresponding to amino acids 162-176 of polyoma MT and ST was able to decrease tumor progression of polyoma tumors, but not of nonpolyoma tumors. This indicated that these amino acids constitute an epitope of the polyoma tumor-specific transplantation antigen.
Insights
Immunizing with a specific peptide from polyoma virus middle T (MT) and small T (ST) antigens inhibited polyoma tumor growth. This peptide represents a key part of the polyoma tumor-specific transplantation antigen (TSTA).
Area of Science:
- Virology
- Immunology
- Oncology
Background:
- Polyoma virus is an oncogenic virus that typically does not form tumors in immunocompetent hosts due to T cell-mediated immune responses.
- The immune system targets a polyoma tumor-specific transplantation antigen (TSTA), which is thought to be associated with the virus's early proteins: small T (ST), middle T (MT), and large T (LT).
Purpose of the Study:
- To identify the specific viral component recognized by the immune system as the polyoma tumor-specific transplantation antigen (TSTA).
- To investigate whether targeting this antigen can inhibit the progression of polyoma virus-induced tumors.
Main Methods:
- Synthesized a peptide corresponding to amino acids 162-176 of the polyoma virus middle T (MT) and small T (ST) antigens.
- Immunized rodents with this synthetic peptide.
- Assessed the effect of immunization on the progression of polyoma tumors and non-polyoma tumors.
Main Results:
- Immunization with the synthetic peptide significantly decreased the progression of polyoma tumors.
- The peptide did not affect the progression of non-polyoma tumors, confirming its specificity.
- These findings strongly suggest that amino acids 162-176 of MT and ST contain a critical epitope of the TSTA.
Conclusions:
- A specific peptide (amino acids 162-176) from polyoma virus MT and ST antigens contains an epitope of the tumor-specific transplantation antigen (TSTA).
- Targeting this epitope via immunization can inhibit polyoma tumor growth, offering a potential therapeutic strategy.