phytohemagglutinin/zea mays

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Effect of cortisol on cutaneous basophil hypersensitivity to phytohemagglutinin in chickens.

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Three independent trials were conducted to determine if cutaneous basophil hypersensitivity (CBH) to the mitogen phytohemagglutinin (PHA-P) was affected by the injection of cortisol in broiler cockerels. Trials 1 and 2 were similar, and Trial 3 imposed a period of heat stress in combination with

Increased T-lymphocyte dependent antibody production in female SJL/J mice following exposure to commercial grade malathion.

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The organophosphate pesticide, malathion, was evaluated for effects on immune function in female SJL/J mice. Commercial grade malathion was dissolved in corn oil and administered at doses of 0.018-180 mg/kg to mice via oral gavage on alternate days for 28 days. Exposure to malathion did not alter

Interactive effects of dietary lipids and vitamin E level on performance, blood eicosanoids, and response to mitogen stimulation in broiler chickens of different ages.

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The effects of the dietary polyunsaturated fatty acids (PUFA) n-6:n-3 ratio and vitamin E (vE) on the levels of pro-inflammatory eicosanoids, the incorporation of docosahexaenoic acid (DHA) and arachidonic acid (AA) into immune tissues, and changes in leukocyte population after phytohemagglutinin

Immunosuppression following exposure to 7,12-dimethylbenz[a]anthracene (DMBA) in Ah-responsive and Ah-nonresponsive mice.

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Recent reports suggest that the immunotoxicity of certain polycyclic aromatic hydrocarbons is associated with the Ah locus in mice. To test whether immunosuppression mediated by 7,12-dimethylbenz[a]anthracene (DMBA) is regulated by the Ah locus, several endpoints of immune function were measured in

Immunosuppressive activity of uterine luminal protein from steroid-treated ovariectomized heifers.

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Uterine luminal protein (ULP) collected from ovariectomized steroid-treated crossbred heifers was tested for immunosuppressive activity in vitro. Heifers were allotted to treatment groups and for 16 d received daily injections of the following steroids or vehicle: Control (C, corn oil only, n=10);

An immunotoxicological evaluation of 4,4'-thiobis-(6-t-butyl-m-cresol) in female B6C3F1 mice. 2. Humoral and cell-mediated immunity, macrophage function, and host resistance.

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Adult female B6C3F1 mice were gavaged with TBBC in corn oil at doses of 10, 100, or 200 mg/kg daily for 14 consecutive days. All immunological parameters were measured 24 hr after the last chemical exposure. When indicated, animals were immunized during the exposure. TBBC produced a decrease in the

Toxicology and Carcinogenesis Studies of 4-Vinyl-1-cyclohexene Diepoxide (CAS No. 106-87-6) in F344/N Rats and B6C3F1 Mice (Dermal Studies).

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4-Vinyl-1-cyclohexene diepoxide is used a chemical intermediate and as a reactive diluent for diepoxides and epoxy resins. Toxicology and carcinogenesis studies were conducted by administering 4-vinyl-1-cyclohexene diepoxide (97% pure) in acetone by dermal application to individually housed F344/N

Effect of nutrition support on immunity in paediatric patients with beta-thalassaemia major.

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Nutritional deficiencies have been variably observed in thalassaemia and the aetiology of many of the immune abnormalities in thalassaemic children are poorly defined. Therefore, we tested the hypothesis that certain immune abnormalities have a nutritional basis. Nutritional status, selective

Effects of perinatal exposure to low doses of PCB 153 and PCB 126 on lymphocyte proliferation and hematology in goat kids.

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Pregnant does (10 goats/group) were dosed orally with either PCB 153 or PCB 126 dissolved in corn oil or only corn oil (control group) from day 60 of gestation until delivery. Effects on in vitro mitogen-induced lymphocyte proliferation and blood cell counts in their goat kids exposed to low levels

Effect of colon tumor development and dietary fat on the immune system of rats treated with DMH.

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We examined the effect of dietary fat and colon tumorigenesis on the morphology and function of the rat mesenteric lymph node (MLN) and spleen at two stages of tumor development. Male Sprague-Dawley rats were fed semipurified diets of varying fat content (5% mixed fat, 24% beef fat, 24% corn oil, or

The influence of dietary essential fatty acids on rat immunocompetent cell prostaglandin synthesis and mitogen-induced blastogenesis.

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Sprague-Dawley rats were fed diets including 10% corn oil (CO), 10% hydrogenated coconut oil (HCO) or 10% linseed oil (LO), and immune cell populations isolated from peripheral blood and spleen were examined for alterations in prostaglandin E (PGE) synthesizing capacity and mitogen-induced

Carrageenan-induced suppression of T-lymphocyte proliferation in the rat: abrogation of suppressor factor production by the prostaglandin synthesis inhibitors, indomethacin and ETYA.

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Carrageenan, an algal polygalactan reputed to be selectively toxic for macrophages, is widely employed as a tool to dissect pathways of cell-mediated immunity. In the present study, corn oil-elicited rat peritoneal macrophages after 72 h culture with 10 micrograms/ml Seakem 9 Carrageenan secreted a

An immunotoxicological evaluation of gamma-chlordane.

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Various toxicological and immunological parameters were assessed after exposure of female B6C3F1 mice to 0.1, 1.0, 4.0, and 8.0 mg/kg gamma-chlordane for 14 days via oral gavage. Variables evaluated included periodic body weights, terminal organ weights, hematology including leukocyte differentials,

Skin graft survival in the uterine lumen of ewes treated with progesterone.

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An experiment was conducted to determine the effect of progesterone on survival of skin transplants placed in the uterine lumen of ovariectomized ewes. Animals were treated for 30 days with either a corn oil vehicle (n = 4) or progesterone at 50 (n = 3) or 200 mg/day (n = 3). An autograft and

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