Peripheral neuropathy associated with malignant neoplasms in dogs     

K G Braund  J A McGuire  K A Amling  R A Henderson 《Veterinary pathology》1987,24(1):16-21

Common peroneal and ulnar nerves of 21 dogs between 2 and 15 years of age with malignant tumors were examined for possible paraneoplastic effects. Percent of abnormalities in single-teased fiber studies exceeded the confidence limits (P = 0.99) established for age-matched control dogs in 16 of 21 dogs (76%) with malignancies, none of which manifested clinical signs of polyneuropathy. The incidence of abnormalities was higher in common peroneal nerve (73%) than in ulnar nerve (57%). Lesions were characterized by a mixture of demyelination/remyelination and axonal degeneration; however, the former lesions predominated in most affected dogs. The severity of the neuropathy varied with different tumors, with the most severe lesions observed in a bronchogenic carcinoma (59%), a mammary adenocarcinoma (59%), a malignant melanoma (48%), and an insulinoma (47%).  相似文献   

Effects of thermal stress and level of feed intake on portal plasma flow and net fluxes of metabolites in lactating Holstein cows   总被引：1，自引：0，他引：1  

M A McGuire  D K Beede  M A DeLorenzo  C J Wilcox  G B Huntington  C K Reynolds  R J Collier 《Journal of animal science》1989,67(4):1050-1060

Six Holstein cows (averaging 475 kg body weight, 2.3 parities and 96 d in lactation) fitted with catheters in the hepatic portal vein, mesenteric vein and intercostalis posterior artery were exposed to treatments of thermal comfort environments with libitum or restricted (75% of ad libitum) DM intake and a thermal stress environment with ad libitum intake in two balanced 3 x 3 latin squares to evaluate effects of thermal stress on portal plasma flow and net fluxes of metabolites. Portal plasma flow was measured by administering a primed, continuous infusion of para-aminohippurate into a mesenteric vein and determining its concentration and dilution in portal vein plasma. Thermal stress treatment increased rectal temperatures and respiration rates. Dry matter intake decreased from thermal comfort ad libitum level (15.1 kg/d) to lower levels in thermal comfort restricted (11.5 kg/d) and thermal stress (11.1 kg/d) treatments. Portal plasma flow was related directly to level of DM intake, declining about 14% with thermal comfort restricted intake and thermal stress environment treatments compared with the thermal comfort restricted intake and thermal stress environment treatments compared with the thermal comfort ad libitum intake treatment. Net flux of alpha-amino N was reduced 20 and 35% by thermal comfort restricted intake and thermal stress treatments compared with the thermal comfort ad libitum intake treatment. Net fluxes of urea N, ammonia N and glucose were not affected by experimental treatments. A portion of the negative effects of thermal stress on milk production can be explained by decreased nutrient intake and decreased nutrient uptake by the portal-drained viscera of the cow.  相似文献   

Mechanism and isotypes involved in passive immunoglobulin transfer to the newborn alpaca (Lama pacos)   总被引：2，自引：0，他引：2  

A E Garmendia  T C McGuire 《American journal of veterinary research》1987,48(10):1465-1471

Crias, newborn alpacas (Lama pacos), that were almost agammaglobulinemic at birth had a 70% increase in total serum proteins within 24 hours largely because of absorption of gamma globulins from colostrum. Immunoglobulin G was the isotype in highest concentration in colostrum and in serum from 24-hour-old crias. The serum IgG concentration of 10 crias increased linearly (r = 0.97) from a mean of 0.3 mg/ml (+/- 0.1 SD) for serum collected before crias suckled to a maximal mean of 30.1 mg/ml (+/- 8.1 SD) at 24 hours. The 24-hour concentration decreased by half in 10 days. Immunoglobulin M also was absorbed from colostrum and increased linearly (r = 0.99) from a mean of 0.5 mg/ml (+/- 0.1 SD) for serum collected before crias suckled to a maximal mean of 4.2 mg/ml (+/- 2.2 SD) 24 hours after birth. The 24-hour serum concentration of IgM decreased by half in 7 days. Therefore, on a weight basis, 7 times more IgG than IgM was transferred to crias; IgG accounted for greater than 85% of the passively transferred proteins in serum of 24-hour-old crias. Absorption of functional antibodies of IgG and IgM isotypes from colostrum of immunized dams by crias also was demonstrated. Immunoglobulin G and IgM antibody titers to chicken RBC increased linearly to maximal geometric mean titers of 1,139 and 843, respectively, 24 hours after birth. The 24-hour IgG and IgM antibody titers decreased by half in 6 and 3.8 days, respectively. Purified alpaca IgG had a molecular mass of 166 kilodaltons, a predominant gamma mobility, and an extinction coefficient of 14.1.(ABSTRACT TRUNCATED AT 250 WORDS)  相似文献   

Deuterium Analysis-- a Simple and Precise Method     

Arnett EM  Strem M  Hepfinger N  Lipowitz J  McGuire D 《Science (New York, N.Y.)》1960,131(3414):1680-1681

By means of reaction with calcium hydride in a generator of simple design, the water samples are converted into H(2) and HD. With hydrogen as carrier gas, the greater thermal conductivity of HD produces a peak whose size is linearly related to the deuterium content of the original water.  相似文献   

Enzyme-linked immunosorbent assay for detection of equine infectious anemia antibody to purified P26 viral protein   总被引：1，自引：0，他引：1  

D T Shen  J R Gorham  T C McGuire 《American journal of veterinary research》1984,45(8):1542-1543

An indirect enzyme-linked immunosorbent assay (ELISA) was developed for the detection of equine infectious anemia (EIA) antibody in horse sera. Purified P26 viral protein was the antigen; alkaline phosphatase linked to rabbit anti-horse immunoglobulin G was the conjugate. The ELISA detected EIA antibodies in horse sera as early as 11 to 14 days after experimental inoculations. There was full agreement between the results of ELISA and the agar-gel immunodiffusion tests on EIA proficiency test sera. The ELISA readily detected EIA antibody in horse sera that had weak positive reactions on agar-gel immunodiffusion.  相似文献   

Evidence for defective neutrophil function in lungs of calves exposed to infectious bovine rhinotracheitis virus   总被引：3，自引：0，他引：3  

R L McGuire  L A Babiuk 《Veterinary immunology and immunopathology》1984,5(3):259-271

Calves were exposed to an aerosol of infectious bovine rhinotracheitis (IBR) virus followed five days later by an aerosol of Pasteurella haemolytica. The animals were subjected to bronchoalveolar lavage before IBR and four days after, and again at 0, 4, 24, and 48 hours following Pasteurella haemolytica challenge. The results of these experiments suggest that neutrophil infiltration into the lung, in response to the presence of the bacteria was delayed thereby allowing the bacteria to become established in the lung. Neutrophils in infected animals displayed little random migration in vitro and did not respond to a chemotactic stimulus. It was also found that alveolar macrophages from virus-infected animals were not able to produce neutrophil chemotactic factors. These data suggest that the decrease in neutrophil chemotaxis and the lack of chemotactic factor production by the alveolar macrophage following infection with infectious bovine rhinotracheitis virus may predispose infected cattle to a secondary bacterial infection.  相似文献   

Quantitation of bovine immunoglobulins: comparison of single radial immunodiffusion, zinc sulfate turbidity, serum electrophoresis, and refractometer methods.     

N E Pfeiffer  T C McGuire  R B Bendel  J M Weikel 《American journal of veterinary research》1977,38(5):693-698

Laboratory methods designed to quantitate serum immunoglobulin were evaluated: single radial immunodiffusion, zinc sulfate turbidity, and serum electrophoresis. Estimation of immunoglobulin concentration in neonatle calves, using total protein measurements, was also evaluated. Single radial immunodiffusion proved useful for quantitation when either class or subclass information was needed. Zinc sulfate turbidity measurements gave accurate results for total immunoglobulin except when hemolysis was present in the sample. A correction factor for hemoglobin that will minimize errors resulting from hemolysis was presented. Serum electrophoresis was also found to be an accurate quantitation method. Large errors were encountered in attempting to estimate immunoglobulin on the basis of total protein.  相似文献   

Changes in the satellite cell population in fetal pig skeletal muscle   总被引：1，自引：0，他引：1  

D R Campion  R L Richardson  R R Kraeling  J O Reagan 《Journal of animal science》1979,48(5):1109-1115

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Insulin-like growth factors and binding proteins in ruminants and their nutritional regulation.     

M A McGuire  J L Vicini  D E Bauman  J J Veenhuizen 《Journal of animal science》1992,70(9):2901-2910

Insulin-like growth factors (IGF) are important mediators of growth, lactation, reproduction, and health. Considerable information on their role in ruminant animals has been learned in the past several years, but the precise mechanisms of their action are not known. The exact biological response of target cells is undoubtedly determined by the developmental state of the cell and synergism with other growth factors. Overall, somatomedins and their binding proteins seem to be major links between cellular developmental processes and nutrient supply. The mechanism by which nutrients control biological actions of somatomedins is not known but clearly involves the synthesis of IGF, as well as their binding proteins and receptors. In ruminants, severe feed restriction decreases circulating concentrations of IGF-I, whereas subtle alterations typical of those that occur in production systems have minimal effect. However, the responses of IGF to somatotropin are affected by modest alterations in nutritional status, including differences in nutritional status that are typically encountered in animal production systems.  相似文献   

Quantitative analysis of pro-inflammatory cytokine mRNA expression in Theileria annulata-infected cell lines derived from resistant and susceptible cattle     

McGuire K  Manuja A  Russell GC  Springbett A  Craigmile SC  Nichani AK  Malhotra DV  Glass EJ 《Veterinary immunology and immunopathology》2004,99(1-2):87-98

The pathogenic mechanisms involved in tropical theileriosis, caused by the tick-borne protozoan parasite Theileria annulata, are unclear. Pathology is associated with the schizont stage of the parasite, which resides within bovine macrophages. Breed-specific differences in pathology have been observed in cattle, several Bos indicus breeds are relatively resistant to tropical theileriosis whilst Bos taurus cattle are highly susceptible. Infected cells express pro-inflammatory cytokines and it has been hypothesized that these cytokines play a major role in the pathology of the disease. Therefore, using quantitative RT-PCR we investigated the expression of the key candidates, interleukin 1 beta (IL-1beta), IL-6 and tumour necrosis factor alpha (TNF-alpha), in T. annulata low passage infected cell lines derived ex vivo from experimental infection of resistant and susceptible cattle. mRNA for each cytokine was detected in all cell lines investigated at levels higher than those observed in resting monocytes. However, the analyses did not identify any breed-specific differences. Therefore, these results are not consistent with the hypothesis that differential regulation of infected cell derived pro-inflammatory cytokines (IL-1beta, IL-6 and TNF-alpha) accounts for the breed-related differences in resistance and susceptibility to T. annulata infection. Other, currently unknown mechanisms may be of greater importance.  相似文献