Rapid induction of forestomach tumors in partially hepatectomized Wistar rats given butylated hydroxyanisole.

Rats subjected to two-thirds partial hepatectomy (PH) and given the antioxidant butylated hydroxyanisole (BHA) at a dietary concentration of 2% for 3 months developed forestomach lesions. Histologically, these lesions were classified as hyperplasia, dysplasia of the basal cell, papillomas, and carcinomas in situ. In intact rats forestomach carcinomas were seen by other investigators after feeding 2% BHA for 15-20 months.

Chronic and subchronic effects of various forms of carrageenan in rats.

The subchronic and chronic toxicity of undegraded (native) carrageenan with respect to botanical source, and type of polymer chain (kappa, lambda, and iota) was investigated in rats for 13 to 39 weeks. The carrageenans were incorporated in the diet at 1 or 5% w/w. In all instances comparable levels of Alphacel were used.

Effects of ethanol on reproduction and arterial hypertension in spontaneously hypertensive and normotensive rats: a preliminary communication.

Ethanol consumption and spontaneous (essential) hypertension are important fetal and maternal risk factors. Alone, they contribute to embryopathy (fetal alcohol syndrome) or maternal organ pathology and fetal loss in hypertensive pregnancies. Combined, the effects of ethanol consumption on the progress of a hypertensive pregnancy have not been adequately investigated.

Ploidy patterns in hepatic tumors induced by Mirex.

The effects of chronic exposure to dietary Mirex was investigated in rat livers over a 13 month period. The distribution of ploidy (diploid and tetraploid nuclei) in nodular and nonnodular areas was analyzed in a Coulter Counter fitted with a Channelizer. The nodules, such as adenomas and carcinomas, were identified in histologic sections obtained from companion samples, part of which was used for analysis of nuclear ploidy.

Paternal effects of ethanol in the long-evans rat.

Ten male Long-Evans rats were given 20% v/v ethanol in the drinking water for 60 consecutive days. Ten other males were given distilled water and served as controls. Each male was then allowed to mate with three virgin female Long-Evans rats, once per week for three consecutive weeks.

Renal effects of indoprofen in rhesus monkeys.

The non-steroidal anti-inflammatory analgesic alpha-[4-(1-oxo-2-iso-indolinyl)-phenyl]propionic acid (indoprofen) was given p.o. in gelatin capsules to six groups of six Rhesus monkeys (three males and three females/group) for 15 months.

The presence of intranuclear lipid inclusions in hepatocytes of mice after chronic ingestion of polybrominated biphenyl.

Electron microscopic study of livers from mice fed 167 ppm polybrominated biphenyl (PBB) for 12 weeks showed hepatocytes with nuclei containing varied amounts of lipid inclusions. The inclusions appeared as spherical vacuoles free in the nuclear matrix. This is the first report of the induction of lipid inclusions within the nucleus by a halogenated hydrocarbon.

The presence of hepatic intramitochondrial crystalline inclusions in polybrominated biphenyl-treated mice.

Electron microscopic study of livers from mice fed 167 ppm polybrominated biphenyl (PBB) revealed mitochondrial abnormalities which consisted of both alterations in size and the formation of crystalline-like inclusions within the mitochondrial matrix. These inclusions appeared as parallel arrays of rods and were found in elongated mitochondria which contained few cristae. The findings are briefly described and the possible significance of such inclusions in relation to mitochondrial aberrations are discussed.

A spontaneous metastasizing exocrine adenocarcinoma of the pancreas in the rat.

A naturally occurring adenocarcinoma of the exocrine pancreas was found in a male, 12-month-old rat. The tumor was found in the mesentery adjacent to the stomach. It consisted of highly anaplastic cells in combination with large strands of collagenous connective tissue indicating desmoplastic properties.

Environmental chemical-induced immune dysfunction.

Antibody formation, endotoxin sensitivity, and resistance to a challenge malarial infection were evaluated in mice fed a diet containing polychlorinated biphenyl (PCB) (Aroclor 1242) or hexachlorobenzene (HCB). Antibody synthesis to the antigen sheep RBC (SRBC) was significantly depressed in the PCB- and HCB-treated (167 ppm) animals as evidenced by the fact that control mice elicited an approximate twofold increase in antibody formation over the chemical-treated mice. Serum IgA concentrations in the PCB- and HCB-treated mice were consistently 40--80 mg/dl lower than control values.

Impaired host resistance to endotoxin and malaria in polychlorinated biphenyl- and hexachlorobenzene-treated mice.

The in vivo effect of polychlorinated biphenyl (PCB) and hexachlorobenzene (HCB) on murine endotoxin sensitivity and resistance to malaria (Plasmodium berghei NYU-2) infection was studied. The dietary administration of 167 ppm (167 microgram/g) of PCB 1242 or HCB for 3 weeks resulted in an enhanced sensitivity to gram-negative endotoxin (Salmonella typhosa), which was further increased in animals maintained on the diets for 6 weeks. By 6 weeks, a 5.

Fluorescence histochemistry of the surface epithelium and stroma in the rhesus monkey ovary.

The surface epithelium and stromal elements in the ovary of the rhesus monkey were studied with a variety of fluorescence-histochemical procedures to determine the relative distribution of specific chemical moieties. The surface (germinal) epithelium displayed high levels of cytoplasmic RNA and specifically intense fluorescence with methods that demonstrate basic, SH and SS groups of protein. The underlying basement membrane demonstrated an intense reaction when fluorochromed with hydroxynaphthoic acid hydrazide directed toward side-chain carboxyl groups of protein.