Biomedical subjects

J A Negulesco

Publications and source records attributed to J A Negulesco.

11 recordsLinked to original sources

PubMed1990

Effects of capsaicin (C) and dihydrocapsaicin (DC) on serum ethanol (ET) concentration of ET treated CF-1 mice.

In this study adult male CF-1 mice were treated on a daily basis as follows: Group A - controls, Group B - ethanol (ET) treated (1.25 g ET/kg body weight (b.wt.], Group C - ET plus 4 mg Capsaicin (C)/kg b.wt., and Group D - ET plus 4 mg dihydrocapsaicin (DC)/kg b.wt. At the end of the sixth week experimental period the animals were anesthetized, exsanguinated and hepatectomized. Our study suggests that ET administered at the rate of 1.25 g ET/kg b.wt. reaches a mean serum value of 43 + 14 mg/dL within 15 minutes. In addition, chronic ET ingestion significantly decreases mean hepatic glycogen content and mean serum triglyceride concentration of the animals. Conjoint administration of ET plus C decreases significantly mean body weight and mean ET and the triglyceride concentration of the serum. Prolonged ET ingestion plus DC administration decreases mean wet liver weight and lowers significantly the mean serum ET, cholesterol and triglyceride concentrations of CF-1 mice.

Alcoholism↗

PubMed1989

Dihydrocapsaicin (DC) protects against serum hyperlipidemia in guinea pigs fed a cholesterol-enriched diet.

Juvenile guinea pigs were maintained either on a standard diet (cholesterol-free) or a 0.5% cholesterol-enriched vitamin C deficient diet for six weeks. Half of the animals of each dietary group were treated with dihydrocapsaicin (DC) at the rate of 8 mg per animal per day. DC administration significantly altered food consumption, body weight, and dry weight of feces of animals maintained on the standard diet. In addition, the mean serum triglyceride concentration of these animals was significantly decreased with DC treatment. Food consumption, body weight and (wet) fecal weight of animals maintained on the 0.5% cholesterol-enriched diet were significantly lower than the corresponding values in control animals even though the liver was much larger in proportion to the total body weight. The mean serum cholesterol concentration of the animals fed a cholesterol-enriched diet was significantly elevated. However, in animals also receiving DC, the cholesterol and triglyceride levels were comparable to controls fed a regular diet. The gross and microscopic fatty infiltration of the liver observed in the cholesterol-fed animal were minimized in those animals fed cholesterol and DC.

Animals↗

PubMed1978

Remodeling of the avian fracture callus by estrone treatment and exposure to a 2 g environment.

Rhode Island Red female chicks were subjected to complete closed fracture of the right radius at two weeks post hatching. The animals were allowed to heal for 2 weeks at either earth gravity (1 g) or a 2 g environment with saline injected controls and estrone injected experimentals. Total fractured bone weight was decreased by exposure to the 2 g environment regardless of whether the animal received saline or estrone treatment. The mean weight of fracture callus was significantly decreased when the hypergravity exposed animals received low hormonal levels of 0.2 mg estrone. The average mid-cross sectional diameter of fracture callus was significantly decreased when the centrifuged chicks received saline or 0.2 mg estrone and it was increased with the administration of high hormonal levels of 0.4 mg to the 2 g animal. The mean thickness of the subperiosteal trabeculae of the bridging callus was decreased by exposure to hypergravity either with or without estrone treatment.

Animals↗

PubMed1978

Responses of articular and epiphyseal cartilage zones of developing avian radii to estrone treatment and a 2-G environment.

Female chicks at 2 weeks post-hatch were maintained for 2 weeks at earth gravity or 2 G with daily injections of 0.2 or 0.4 mg estrone. Animals were sacrificed following the last injection and radii were fixed in 10% NBF, decalcified in 3% Nitric acid, doubly embedded, sectioned at 4 to 5 micrometer, and routinely processed for histological measurements of the midcoronal height and width of the cartilage zones of the proximal and distal epiphyses. Estrone treatment increased the growth in height and width of the cartilage layers of the proximal epiphyses and inhibited the growth in height of the distal epiphyseal cartilage of earth gravity chicks. Animal exposure to 2 G without estrone treatment resulted in increased width of the cartilage layers of the proximal epiphyses and inhibition of both height and width growth of the cartilage layers of the distal epiphyses. Growth in height, but not width, of the cartilage layers of both proximal and distal epiphyses was inhibited by combined estrone treatment and animal exposure to the 2 G environment.

Animals↗

PubMed1978

The effect of ethanol on cerebral glycogen levels in the chick embryo.

Ethanol (10 to 50 micro-liters/egg) was injected into the albumen of the 13 day chick embryo. The control solution and ethanol carrier was bacteriostatic saline (0.1 ml). The KOH-alcohol-Anthrone colorimetric method was used for glycogen determination. Ethanol at 20 or 30 mul/egg lowered the mean cerebral glycogen (p less than 0.05). Higher dosages elevated cerebral glycogen over the same time period (p less than 0.05). The glycogen-depleting effect of 20 mul/egg and the glycogen increasing effect of 40 mul/egg were maintained through 168 hours of ethanol exposure (20 days incubation).

Animals↗

PubMed1978

Effects of fracture trauma, estrone treatment, and 2-G environment on the epiphyseal cartilage zones of developing avian radii.

Female birds subjected to closed fracture of the right radius at 2 weeks post-hatching were allowed to heal for 14 d at either earth gravity (1 G) or a 2-G hypergravity state, with saline-injected controls and 0.2- and 0.4-mg estrone (estrogen) treated groups. Animals were sacrificed following the last injection and radii were routinely processed histologically for micrometer measurements of the mid-coronal height and width of the cartilage zones of the proximal and distal epiphyses. Proximal epiphyses of estrone-treated, normo-gravity chicks showed a decreased growth in height of the articular, proliferating, and hypertrophic cartilage zones and an increased interstitial growth of the hypertrophic and calcified layers of estrone-treated, 2-G animals. Growth in height of the cartilage layers of the distal epiphyses of fractured radii was primarily stimulated when estrone-treated chicks were also exposed to the 2-G state. Appositional growth of all cartilage layers of the proximal and distal epiphyses of normo-gravity birds was increased by 0.2 mg estrone. In addition, growth in the width of all cartilage layers of the distal epiphyses of 2-G animals was increased with the administration of 0.4 mg estrone.

Animals↗

PubMed1977

Effects of increased earth gravity and estrone treatment on intact and healing avian radii.

Estrone, 0.4 mg administered daily for 7 days to developing chicks at 2 weeks post hatching, increased total mass and accelerated the rate of growth of the diaphyseal and proximal epiphyseal diameters of intact radii. Fractured radii of animals subjected to the same hormonal treatment displayed decreased bone weight but increased rate of growth of the proximal epiphyseal diameters and longer but thinner and lighter calluses. Two-week-old chicks, which had received no estrone, when exposed to a week-long 2g environment showed decreased intact bone weight and, with the exception of length of fracture callus, a reduction of all measured parameters of fractured bones. Estrone treatments of 0.4 mg administered daily to hypergravity-exposed animals over a week-long period resulted in greater length of fracture callus and increased rate of growth of the proximal epiphyseal diameter of both intact and fractured bones. The same treatments decreased weight and linear growth of fractured bones and width and weight of the fracture callus.

Animals↗

PubMed1977

The glycogen-depleting effect of aqueous estrone on the cerebral hemispheres of the chick embryo.

Aqueous estrone (10 to 50 pigrams/egg) was injected into the albumen of the 13 day chick embryo. The control solution and estrone carrier was 0.1 ml bacteriostatic saline. The KOH-alcohol-Anthrone colorimetric method was used to determine glycogen. 20 or more pigrams estrone/egg lowered the mean cerebral glycogen significantly (P less than 0.01) after 24 hours duration in a non-dosage-dependent manner. The glycolytic effect was demonstrated by the 20.0 pigram dosage after 120 hours duration.

Animals↗

PubMed1976

Simplified hypophysectomy technique for young birds.

The present work introduces a modified oral approach to the pituitary gland of the immature bird with improved localization and visualization of the organ in situ. The hypophysectomy procedure is based on simplified instrumentation readily available or constructed with materials present in most, if not all, laboratories. The technique has the added advantage of minimal exsanguination, virtually no operative trauma, and allows for a rapid post operative animal recovery.

Animals↗

PubMed1976

Hypergravity effects on normal and avulsed developing avian radii.

Rhode Island Red female chicks were subjected to complete closed fracture of the right radius at 2 weeks post-hatching. The animals were allowed to heal for 1 week at either earth gravity or 2 G hypergravity state with control and estrogen-injected groups. Intact and fractured radial length, weight, average epiphysial-diaphysial diameters, and length, width, and weight of healing fracture callus were measured. Daily 2000 IU estrogen administration for 7 d increased intact radial length. Estrogen augments the effects of the 2-G state by inhibiting growth and depleting the mass of both intact and fractured radii and by decreasing the average distal epiphysial diameter of fractured bones. Animals exposed to the hypergravity state without hormonal treatment showed decreased fractured radial length, weight, and smaller proximal epiphysial diameters. The measurable parameters of the fracture callus (width, length, and weight) were depressed by the hypergravity state regardless of whether the animal was untreated or supplemented with estrogen.

Animals↗

PubMed1976

Accumulative effects of 2 weeks' exposure to a 2-G hypergravity state and estrogen treatment upon intact and fractured radii of young female birds.

Female birds were subjected to closed fractured of the right radius at 2 weeks post-hatching and allowed to heal for 14 d. The animals were maintained at either earth gravity or a 2-G hypergravity state with control and 2000 and 4000 IU Estrone-(estrogen) injected groups. Intact and fractured radii were measured for length, weight, average epiphysial-diaphysial diameters, and length, width and weight of fracture callus. Animals receiving 2000 IU estrogen treatment showed decreased intact and fractured bone weight, as well as smaller diaphysial diameters. Fractured, but not intact, bone length was decreased by the two estrogen levels without affecting the callus parameters. Bone weight and average epiphysial diameters of both intact and fractured radii were decreased by the hypergravity state. Intact bone diaphysis and fractured bone length were similarly affected. Large, 4000 IU, estrogen levels potentiated the hypergravity state and reduced distal epiphysial diameter of intact radii.

Animals↗