Cimaterol reduces beta-adrenergic receptor density in rat skeletal muscles.   总被引：1，自引：0，他引：1  

Y S Kim  R D Sainz  R J Summers  P Molenaar 《Journal of animal science》1992,70(1):115-122

Interactions between the beta-adrenoceptor agonist cimaterol and beta-adrenoceptors on rat skeletal muscle membranes were examined in two studies. In Exp. 1, muscle samples from eight Sprague-Dawley rats (female, approximately 200 g) were used for competition binding and autoradiographic studies using [125I]cyanopindolol (ICYP) as a radioligand. The affinities or dissociation constants for binding (KD values) for cimaterol in plantaris and soleus muscles were .68 and .92 microM, respectively. Muscle areas stained for succinic dehydrogenase had propranolol-resistant ICYP binding sites; cimaterol did not seem to compete for these sites. In Exp. 2, 60 Sprague-Dawley rats (female, approximately 218 g) were fed 0 or 10 ppm of cimaterol in rat diet that was ground. Groups were killed after 1, 3, 7, 14, or 28 d of treatment. Cimaterol increased BW gain up to 14 d after commencement of treatment, with little or no improvement thereafter. Enhanced weight gain in skeletal muscles also occurred up to 14 d of cimaterol treatment. Densities of beta-adrenoceptors in plantaris and soleus muscle membrane homogenates were estimated using a radioligand binding assay with ICYP. A significant reduction in the number of binding sites (Bmax) was observed after 3 d of cimaterol treatment in plantaris muscle without a change in the KD of ICYP binding. The percentage reductions in Bmax were 26.8, 42.2, 37.7, and 37.8% at 3, 7, 14, and 28 d after cimaterol administration, respectively. In the soleus muscle, significant reductions (44.1 and 29.8%) in Bmax were observed after 3 and 14 d of cimaterol treatment.(ABSTRACT TRUNCATED AT 250 WORDS)  相似文献   

Metastatic thymic lymphosarcoma in a calf     

K L Angel  J Stott  J W Tyler  A H Groth 《Journal of the American Veterinary Medical Association》1991,198(10):1771-1773

Metastatic thymic lymphosarcoma was diagnosed in a 16-month-old mixed-breed heifer with a history of progressive weight loss. Physical examination revealed cachexia, pale mucous membranes, large peripheral lymph nodes, and a 15 X 40-cm mass in the ventral portion of the neck, extending cranially from the thoracic inlet. Neoplastic lymphocytes were identified in aspirates of pleural effusion and bone marrow. Histologic examination of necropsy specimens substantiated metastatic dispersal of the tumor into lymphoid tissue, liver, intestine, heart, and kidney. This case differs from other reported cases of thymic lymphosarcoma because of the involvement of organs other than the thymus and lymph nodes. Analytical flow cytometry was performed on mononuclear leukocytes obtained from blood by use of density gradient centrifugation. The majority of cells (65%) appeared to be of an immature, poorly differentiated phenotype, on the basis of the small numbers of cells stained with monoclonal antibodies specific for the following cell surface markers: 8% BoCD2 (IL-A26; sheep erythrocyte receptor on T-lymphocytes); less than 10% B-lymphocytes as determined by expression of MHC class II proteins and surface immunoglobulin; 12% monocytes (IL-A24); and 5% null cells (IL-A29). Although the leukemic cell population did not express traditional surface markers for T-lymphocytes, we hypothesize that the leukemic cell population represents an early stage of T-cell maturation that has failed to differentiate and express characteristic cell surface antigens.  相似文献   

Do eosinophils have a role in the severity of Babesia annae infection?     

Camacho AT 《Veterinary parasitology》2005,134(3-4):281-282

  相似文献   

First isolation and molecular characterization of Ehrlichia canis in Spain     

Aguirre E  Sainz A  Dunner S  Amusategui I  López L  Rodríguez-Franco F  Luaces I  Cortés O  Tesouro MA 《Veterinary parasitology》2004,125(3-4):365-372

This paper reports the first isolation and culture of Ehrlichia canis in Spain from a naturally infected dog using the DH82 cell line. After DNA extraction and PCR amplification, a nearly complete (1412bp) sequence of the 16S rRNA gene of the new E. canis strain was obtained. The GenBank accession number for the nucleotide sequence of this strain is AY394465. This sequence was aligned with the 16S rRNA gene sequences of other Ehrlichia strains accessible in GenBank. The 16S rRNA gene sequence of the E. canis strain reported here showed a high percentage of similarity with the 16S rRNA gene sequence of E. canis from different geographic areas including Japan, Venezuela and Israel. These data confirm the presence of E. canis in Spain.  相似文献   

Serum gastrin in canine chronic lymphocytic-plasmacytic enteritis     

García-Sancho M  Rodríguez-Franco F  Sainz A  Rodríguez A  Silván G  Illera JC 《The Canadian veterinary journal. La revue veterinaire canadienne》2005,46(7):630-634

This study evaluates serum gastrin concentrations in dogs with chronic lymphocytic-plasmacytic enteritis, as well as its possible relationship with the severity of lesions present in the stomach. To achieve this aim, 5 dogs without gastrointestinal disease and 15 dogs with chronic lymphocytic-plasmacytic enteritis were included. Serum gastrin concentrations were significantly increased in dogs with chronic lymphocytic-plasmacytic enteritis compared with those in dogs without gastrointestinal disease. Also, there was a positive correlation between the severity of the gastric lesion and the serum gastrin concentration. Our findings indicate the possibility that gastrin plays a role in the etiology of an accompanying chronic antral gastritis in canine chronic lymphocytic-plasmacytic enteritis.  相似文献   

Pharmacokinetics and residues of a new oral amoxicillin formulation in piglets: a preliminary study     

Hernandez E  Rey R  Puig M  Garcia MA  Solans C  Bregante MA 《Veterinary journal (London, England : 1997)》2005,170(2):237-242

The pharmacokinetics of amoxicillin (Amx) were determined in pigs following intravenous (IV) administration of a single dose of 15 mg/kg and a single dose of 15 mg/kg of a new oral formulation (Amx-FP containing 10% amoxicillin). Residue studies were performed to determine residues in edible tissues of healthy pigs after chronic oral administration of Amx-FP at a daily dose of 15 mg/kg for five consecutive days. After IV administration, the plasma concentration was characteristic of a two-compartment open model. The main pharmacokinetic variables were: t(1/2lambda(n)), MRT=90.1 min, V(darea)=0.81 L/kg and Cl(b)=3.9 mL/kg/min. After single oral administration the main pharmacokinetic variables were: C(max)=758 mug/L, t(max)=347 min and Cl(b/f)=3.7 mL/kg/min for Amx-FP. The oral bioavailability (F) was calculated at 11% for Amx-FP. Based on maximum residue levels (MRL) for AMX in pigs established at 50 microg/kg for all tissues, the withdrawal times of AMX in muscle and skin plus fat were estimated (95% tolerance limit and 95% confidence) to fall below the MRL after a withdrawal period of seven days. Levels of AMX in the liver and kidneys were estimated to fall below the MRL after a withdrawal period of four days.  相似文献   

Genetic distances: a useful tool to be applied with caution.     

Miguel Angel Toro 《Zeitschrift für Tierzüchtung und Züchtungsbiologie》2008,125(1):3-4

  相似文献   

Lipid droplets in clusters negatively affect Bos indicus embryos during cryopreservation          下载免费PDF全文

Eva Patricia López‐Damián  José Alfredo Jiménez‐Medina  Miguel Angel Lammoglia  Jaime Arturo Pimentel  Lourdes Teresa Agredano‐Moreno  Chris Wood  Carlos Salvador Galina  Tatiana Fiordelisio 《Anatomia, histologia, embryologia》2018,47(5):435-443

Embryo transfer using cryopreserved B. indicus embryos results in low pregnancy rates. The low viability of B. indicus embryos is likely a result of their low freezability relative to embryos from other species, notably B. taurus. Freezability is probably related to the quantity of lipid droplets in the embryonic cells. However, the mechanism underlying this association is unknown. Using multiphoton and transmission electron microscopy, the proportion, volume, morphology and composition of lipid droplets in fresh and cryopreserved B. indicus and B. taurus embryos were studied. B. indicus embryos have more droplets than B. taurus and a greater percentage of lipid droplets in clusters (34% vs. 24%; p < 0.05). Also, B. indicus individual droplets are of greater volume than those of B. taurus (47 μm³ vs. 34 μm³; p < 0.05). After freezing, the percentage of clusters decreased in B. indicus (11% vs. 5%; p < 0.05), while in B. taurus they increased (2% vs. 7%; p < 0.05). Freezing influenced the lipid droplet morphology, increasing the number of cracked droplets in B. indicus embryos (33% fresh vs. 62% frozen; p < 0.05), but not in B. taurus embryos (35% fresh vs. 34% frozen; ns). Regarding composition, saturated lipid droplets prevail in B. indicus embryos, contrary to B. taurus embryos. We observed differences in lipid droplet organization, proportion, volume, morphology and composition between B. indicus and B. taurus embryos which are altered in opposite directions following freezing.  相似文献   

Use of dehydrated waste grape skins as a natural additive for producing rosé wines: study of extraction conditions and evolution     

Pedroza MA  Carmona M  Salinas MR  Zalacain A 《Journal of agricultural and food chemistry》2011,59(20):10976-10986

Dehydrated waste grape skins from the juice industry were used as an additive to produce rosé wines. Maceration time, particle size, dosage, alcoholic content, and maceration temperature were first studied in model wine solutions using two different dehydrated waste grape skins. Full factorial experimental designs together with Factor Analysis and Multifactor ANOVA allowed for the evaluation of each parameter according to the composition of color and phenolic and aroma compounds. Higher maceration time favored the extraction of anthocyanins; phenolic compound release was influenced by dosage independent from other factors studied. Rosé wines were produced by direct addition of dehydrated waste grape skins, according to selected parameters in two different white wines, achieving characteristics equivalent to commercial rosé wines. After three months of storage, rosé wine composition was stable.  相似文献   

Ability of various water‐insoluble fertilizers to supply available phosphorus in hydroponics to plant species with diverse phosphorus‐acquisition efficiency: Involvement of organic acid accumulation in plant tissues and root exudates     

Javier Erro  Angel Ma Zamarreo  Jose Ma García‐Mina 《植物养料与土壤学杂志》2010,173(5):772-777

Previous studies describe the suitability of a new type of phosphorus (P) fertilizer, called “rhizosphere‐controlled fertilizer” (RCF), to supply available P to plants while reducing soil phosphorus fixation. In order to explore the involvement of organic acid root exudation in P uptake from RCF, we investigated the relationship between shoot and root P concentrations, and the concentration of the main polycarboxylic organic acids in roots, shoots, and plant exudates. Plant species with different P‐acquisition efficiency (low: maize; medium: chickpea; high: lupin) were grown in hydroponics with three different P fertilizers: The water‐insoluble P fraction of RCF (RCF); Phospal, a slow‐release source of phosphate composed of calcium and aluminum phosphates (PH); monopotassiumphosphate (KP), and a control treatment without P (P–). RCF was as efficient as KP in supplying P to plants in the case of chickpea and lupin, and slightly less efficient than KP in maize. However, P from PH was not available for maize and less available compared to KP and RCF in chickpea and lupin. This variation reflects the different efficiencies in P acquisition for the three plant species. Except in the case of maize, plants receiving KP presented the lowest concentration of organic acids in roots and exudates, while those plants suffering severe P deficiency (P– and PH) showed the highest organic acid concentration. However, RCF had a high concentration of organic acids in roots and exudates, as well as a high P concentration in the shoot indicating that P uptake from RCF is enhanced due to root release and action of specific organic acids.  相似文献