Biomaterial Database

Ultrastructure of tumors induced in the rat urinary bladder by nitrosomethyldodecylamine. 1981

H M Reznik-Schüller

N-Nitroso-N-methyl-n-dodecylamine (NMDA) is a powerful carcinogen in the rat and the Syrian golden hamster. In both species the urinary bladder is the main target organ. We studied the ultrastructure of these bladder tumors in the Fischer rat in some detail, since this compound provides an interesting model for carcinogenesis in the urinary bladder. We found that the proliferating basal layers of the transitional cell carcinomas were undergoing squamous metaplasia, which indicates that squamous carcinomas in the organ may arise from pre-existing transitional cell tumors.

UI	MeSH Term	Description	Entries
D008297	Male		Males
D008679	Metaplasia	A condition in which there is a change of one adult cell type to another similar adult cell type.
D008854	Microscopy, Electron	Microscopy using an electron beam, instead of light, to visualize the sample, thereby allowing much greater magnification. The interactions of ELECTRONS with specimens are used to provide information about the fine structure of that specimen. In TRANSMISSION ELECTRON MICROSCOPY the reactions of the electrons that are transmitted through the specimen are imaged. In SCANNING ELECTRON MICROSCOPY an electron beam falls at a non-normal angle on the specimen and the image is derived from the reactions occurring above the plane of the specimen.	Electron Microscopy
D009602	Nitrosamines	A class of compounds that contain a -NH2 and a -NO radical. Many members of this group have carcinogenic and mutagenic properties.	Nitrosamine
D001749	Urinary Bladder Neoplasms	Tumors or cancer of the URINARY BLADDER.	Bladder Cancer,Bladder Neoplasms,Cancer of Bladder,Bladder Tumors,Cancer of the Bladder,Malignant Tumor of Urinary Bladder,Neoplasms, Bladder,Urinary Bladder Cancer,Bladder Cancers,Bladder Neoplasm,Bladder Tumor,Cancer, Bladder,Cancer, Urinary Bladder,Neoplasm, Bladder,Neoplasm, Urinary Bladder,Tumor, Bladder,Tumors, Bladder,Urinary Bladder Neoplasm
D002294	Carcinoma, Squamous Cell	A carcinoma derived from stratified SQUAMOUS EPITHELIAL CELLS. It may also occur in sites where glandular or columnar epithelium is normally present. (From Stedman, 25th ed)	Carcinoma, Epidermoid,Carcinoma, Planocellular,Carcinoma, Squamous,Squamous Cell Carcinoma,Carcinomas, Epidermoid,Carcinomas, Planocellular,Carcinomas, Squamous,Carcinomas, Squamous Cell,Epidermoid Carcinoma,Epidermoid Carcinomas,Planocellular Carcinoma,Planocellular Carcinomas,Squamous Carcinoma,Squamous Carcinomas,Squamous Cell Carcinomas
D002295	Carcinoma, Transitional Cell	A malignant neoplasm derived from TRANSITIONAL EPITHELIAL CELLS, occurring chiefly in the URINARY BLADDER; URETERS; or RENAL PELVIS.	Carcinomas, Transitional Cell,Cell Carcinoma, Transitional,Cell Carcinomas, Transitional,Transitional Cell Carcinoma,Transitional Cell Carcinomas
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D051381	Rats	The common name for the genus Rattus.	Rattus,Rats, Laboratory,Rats, Norway,Rattus norvegicus,Laboratory Rat,Laboratory Rats,Norway Rat,Norway Rats,Rat,Rat, Laboratory,Rat, Norway,norvegicus, Rattus

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