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Monoclonal antibodies to the mouse p19(Arf) tumor suppressor protein
David Bertwistle1, Frederique Zindy, Charles J Sherr
1Department of Genetics and Tumor Cell Biology, St. Jude Children's Research Hospital, Memphis, Tennessee 38105, USA.
Abstract:
The Arf tumor suppressor protein inhibits cell proliferation through both p53-dependent and -independent mechanisms. Two rat monoclonal antibodies raised against a peptide corresponding to amino acids 54-75 of the mouse p19(Arf) protein reacted with the native protein expressed in mammalian cells. Neither antibody detected human or golden hamster Arf proteins. The two antibodies, both of IgG2b isotype, are directed to adjacent epitopes contained within residues 54-62 and 62-75, respectively, of the mouse p19(Arf) protein, and both were highly efficient in detecting p19(Arf) by immunoprecipitation, immunoblotting, and immunofluorescence. One antibody proved useful for immunohistochemical staining of p19(Arf) in fixed sections of mouse testes, revealing low levels of protein expression within the nucleoli of spermatogonia. This indicates that these antibodies should be useful in detecting the endogenous p(19Arf) protein at specific stages of mouse development and during early stages of tumorigenesis.
Insights
Researchers developed two monoclonal antibodies targeting mouse p19(Arf) protein. These antibodies effectively detect the Arf tumor suppressor in various assays and are useful for studying its role in mouse development and cancer.
Area of Science:
- Oncology
- Immunology
- Molecular Biology
Background:
- The Arf tumor suppressor protein plays a crucial role in inhibiting cell proliferation via p53-dependent and -independent pathways.
- Understanding Arf protein expression is vital for cancer research and developmental biology.
Purpose of the Study:
- To develop and characterize novel monoclonal antibodies for detecting the mouse p19(Arf) protein.
- To assess the utility of these antibodies in various immunological assays and for immunohistochemistry.
Main Methods:
- Generation of rat monoclonal antibodies against a specific peptide of mouse p19(Arf).
- Testing antibody reactivity with native p19(Arf) in mammalian cells.
- Evaluation of antibody performance in immunoprecipitation, immunoblotting, and immunofluorescence assays.
- Application of antibodies for immunohistochemical staining of fixed mouse tissues.
Main Results:
- Two monoclonal antibodies (IgG2b isotype) were successfully raised against mouse p19(Arf) residues 54-62 and 62-75.
- Antibodies demonstrated high efficiency in detecting native p19(Arf) via immunoprecipitation, immunoblotting, and immunofluorescence.
- Neither antibody cross-reacted with human or golden hamster Arf proteins.
- One antibody was effective for immunohistochemical staining of p19(Arf) in mouse spermatogonia nucleoli.
Conclusions:
- The developed monoclonal antibodies are specific and efficient tools for detecting mouse p19(Arf).
- These antibodies can be utilized to study endogenous p19(Arf) protein levels during mouse development and in early tumorigenesis.
- The findings provide valuable reagents for cancer research and developmental studies involving the Arf pathway.
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