Autoradiographic Evidence for the Association of DNA With Intracytoplasmic A-Particle Inclusions In Situ2

Autor:	G. H. Smith, D. G. Longfellow, J. W. Nixon
Rok vydání:	1975
Předmět:	In situ Cancer Research Granin Biology medicine.disease Molecular biology Nuclear DNA Cell nucleus chemistry.chemical_compound medicine.anatomical_structure Oncology Leydig Cell Tumor chemistry medicine Neoplasm Thymidine DNA
Zdroj:	JNCI: Journal of the National Cancer Institute. 55:1413-1417
ISSN:	1460-2105 0027-8874
DOI:	10.1093/jnci/55.6.1413
Popis:	Mice with subcutaneous transplants of a Leydig cell tumor were given tritiated thymidine sc proximal to the tumor mass. The labeled tissue was collected and samples for autoradiography were taken. Nuclei and intracytoplasmic. A particle(s) (CAP) were purified from the remainder of the tumor pool. The distribution of radioisotopic grains over electron microscopic autoradiography was semiquantitated and analyzed. Granin were found over CAP inclusions in situ. Comparison of the relative frequency of CAP-associated grains to nuclear grains by probability on a planar area basis revealed a higher frequency of thymidine incorporation into these structures. Isolation and comparison of the DNA(s) associated with CAP and nuclei showed a higher specific activity for CAP-associated DNA than for nuclear DNA, which was in good agreement with the autoradiographic analysis. The DNA associated with the purified CAP possessed a significantly higher buoyant density in CsCl than did the nuclear DNA. These reslult implied that this DNA was present in CAP inclusions in situ.
Databáze:	OpenAIRE
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