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PROPERTIES OF THE CAUSATIVE AGENT OF A CHICKEN TUMOR : III. ATTEMPTS AT ISOLATION OF THE ACTIVE PRINCIPLE
J B Murphy1, E Sturm, A Claude
1Laboratories of The Rockefeller Institute for Medical Research.
The Journal of Experimental Medicine
|October 30, 2009
Summary
Researchers isolated a tumor-producing agent from chicken tumors using two methods. The agent was successfully separated from protein fractions, indicating it is not protein-based.
Area of Science:
- Oncology
- Biochemistry
- Virology
Background:
- Chicken Tumor I is a significant model for studying tumor formation.
- Understanding the nature of the tumor-producing agent is crucial for cancer research.
Purpose of the Study:
- To isolate and characterize the tumor-producing agent from Chicken Tumor I extract.
- To determine if the tumor-producing agent is protein-based.
Main Methods:
- Separation of protein fractions from tumor extracts using two distinct methods.
- Reprecipitation of the active fraction to assess stability.
- Adsorption of protein using aluminum hydroxide to separate from the active agent.
- Chemical and biological assays to determine protein content.
Main Results:
- A protein fraction carrying the tumor-producing agent was successfully isolated.
- The agent's activity remained stable after multiple dissolution and reprecipitation cycles.
- Aluminum hydroxide selectively adsorbed the protein, leaving the agent in the solution.
- The purified agent exhibited very low or undetectable protein content.
Conclusions:
- The tumor-producing agent in Chicken Tumor I is largely dissociated from protein.
- The findings suggest the agent is non-proteinaceous, challenging previous assumptions.
- This purified agent offers a new avenue for investigating the mechanisms of tumor formation.
