Formation of N-nitroso compounds in gastric juice has been implicated in the pathogenesis of cancer in the stomach after operation. Gastric juice was aspirated from 85 subjects: 23 were controls, 51 had previously undergone vagotomy and gastrojejunostomy, and 11 had previously undergone vagotomy and pyloroplasty. The gastric juice samples were analysed for pH, nitrite, and total N-nitroso compo...

Colorectal cancer is the third most common cancer in developed countries such as the U.K., but incidence rates around the world vary approx. 20-fold. Diet is thought to be a key factor determining risk: red and processed meat, but not white meat or fish, are associated with an increased risk of colorectal cancer. The endogenous formation of N-nitroso compounds is a possible explanation because ...

An improved procedure for chemically decontaminating residues of nitrosoureas and related N-nitroso compounds ("nitrosamides") commonly used in the cancer research laboratory is proposed. Treatment of accumulated wastes with aluminum:nickel alloy powder while progressively increasing the basicity of the medium consistently led to at least 99.98% destruction of each nitrosamide tested. Hazardous...

N-Nitroso(2-hydroxypropyl)(2-oxopropyl)amine (HPOP) proved to be a potent carcinogen in Syrian golden hamsters. The compound is an in vivo metabolite of N-nitrosobis(2-hydroxypropyl)amine, N-nitrosobis(2-oxopropyl)amine (BOP), and N-nitroso-2,6-dimethylmorpholine and a postulated proximate pancreatic carcinogen in hamsters. As with BOP, HPOP induced a higher incidence of pancreatic ductular ade...

The title compound is a new pyrazolone derivative which was synthesized starting from p-sulphophenyl-3-methyl-5-pyrazolone (1) by nitrosation at low temperature to afford the corresponding p-sulphophenyl-3-methyl-4-nitroso-5-pyrazolone can exist both in nitroso (2a) and oxime tautomeric forms (2b). Reduction of latter using zinc with hydrochloric acid furnished 4-amino-p-sulphophenyl-3-methyl-5...

Chiral nonracemic aminated nitroso acetals were synthesized via diastereoselective multicomponent [4 + 2]/[3 + 2] cycloadditions employing new (S,E)-γ-nitrogenated nitroalkenes 5a-c as heterodienes, ethyl vinyl ether (EVE) as a dienophile, and selected electron-deficient alkenes as 1,3-dipolarophiles. The employment of different organic solutions of LiClO4 or LiCl as promoter systems provided t...

Incubation in vitro of recombinant wild-type murine p53 protein with S-nitroso-N-acetyl-DL-penicillamine [a nitric oxide (NO)-releasing compound] has resulted in a change of p53 conformation and also in a significant decrease of its specific DNA binding activity. Similarly, upon treatment with S-nitroso-N-acetyl-DL-penicillamine (2-5 mM) or S-nitroso-glutathione (1-2 mM), human breast cancer ce...