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Visceral yolk sac-derived tumors
H Sobis1, A Verstuyf, M Vandeputte
1University of Leuven, Rega Institute for Medical Research, Belgium.
The International Journal of Developmental Biology
|March 1, 1993
Summary
Externalizing the visceral yolk sac in rodents creates extra-embryonal tumors. These tumors, including yolk sac carcinomas and benign teratomas, originate from dedifferentiated yolk sac cells and can be used to study oncofetal antigens.
Area of Science:
- Developmental Biology
- Oncology
- Reproductive Biology
Background:
- Externalization of the visceral yolk sac in rodents after fetectomy induces extra-embryonal tumor formation.
- These tumors can be benign teratomas or malignant yolk sac carcinomas, with differing onset times.
- Viral induction, using Mouse Sarcoma Virus (MSV), accelerates malignant tumor development and can lead to embryonal carcinoma characteristics.
Purpose of the Study:
- To characterize the origin and behavior of extra-embryonal fetal tumors induced by visceral yolk sac externalization.
- To investigate the cellular origins of benign teratomas and malignant yolk sac carcinomas.
- To explore the potential of these tumors as models for studying oncofetal antigens.
Main Methods:
- Surgical fetectomy and subsequent visceral yolk sac displacement in rodents.
- Viral induction using Mouse Sarcoma Virus (MSV) injection.
- Morphological and biological characterization of induced tumors (teratomas, yolk sac carcinomas, choriocarcinoma).
- Transplantation studies in syngeneic and allogeneic hosts.
- Tissue culture of tumor cells.
- Monoclonal antibody production and characterization for oncofetal antigen detection.
Main Results:
- Benign teratomas arise from dedifferentiated, multipotential endodermal cells of the yolk sac, differentiating into adult tissues from all three germ layers.
- Malignant yolk sac carcinomas, virus-induced or spontaneous, share morphological and biological traits, metastasize, and are transplantable.
- Choriocarcinoma, a rare malignant variant, is hormonally active and transplantable in allogeneic hosts.
- Yolk sac tumors are a valuable source for detecting oncofetal antigens, with specific monoclonal antibodies identifying endodermal antigens and cytotrophoblast markers.
Conclusions:
- Extra-embryonal tumors in rodents, derived from the displaced visceral yolk sac, provide a model for studying tumor development and differentiation.
- Multipotential cells in the yolk sac are the likely precursors for both benign teratomas and malignant transformations.
- These tumors serve as critical models for identifying and characterizing oncofetal antigens, aiding in cancer research.