Efecto de diferentes sistemas de alojamiento en conejos de la raza leprino de viterbo

Sin resume

Microbial cell-free extracts as sources of enzyme activities to be used for enhancement flavor development of ewe milk cheese

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Serum level of hormone and metabolites in pregnant rabbit does

The aims of this study were to compare the hormones and metabolites serum levels and the reproductive performances of nulliparous (n=100) and primiparous pregnant does submitted to artificial insemination (AI) 11 days post-partum. On the day of AI, all the does were weighed and the sexual receptivity was evaluated. The kits were weaned at 26 day. Blood samples were collect by punc- ture of the marginal ear vein from one day before AI until few days before the kindling and assayed for hormones and metabolites. The higher sexual receptivity and the fertility in nulliparous than in primiparous does confirmed the negative effect of lactation. Nulliparous does showed higher blood con- centration of leptine than primiparous, and in both the groups such level lowered during pregnancy, probably reflecting the reduction of the fat reserve. The insuline level increased during pregnancy in either groups as a consequence of the growing of the foetuses. In nulliparous does the cortisol, NEFA and T3 concentrations were higher than primiparous does. The glucose levels were similar in both the groups probably due to the homeostatic mechanisms controlling the glycemia. Hormonal and metabo- lite analyses represent a good tool for understanding the physiological mechanisms required to meet higher reproductive performance

Natural additive (aqueous extract) in rabbit diet: effects on performance and oxidative and innate immunological status

Abstract - Natural antioxidants are receiving increased attention in human and animal nutrition because of their association with food quality characteristics and immune responses 1, 2. Aromatic plants and their essential oils are good sources of natural antioxidants, such as phenolic compounds, e.g., eugenol, thymol, carvacrol 3. Plant such as Oregano (Origanum vulgare) has attracted great interest as its essential oil is rich in the monoterpenes, thymol and carvacrol, which exhibit good antioxidant and antimicrobial activities in vitro and in vivo, together with stimulating animal digestion 4. The present study aimed to evaluate the effect of dietary supplementation with an Oregano aqueous extract on performance and oxidative and innate immunological status of growing rabbits. The experimental protocol was planned according to University of Perugia Animal Committee guidelines and the trial was carried out at the experimental farm of the Department of Agricultural, Food and Environmental Science (University of Perugia, Italy). At weaning (30 days of age) 240 weaned New Zealand White rabbits of both sexes were randomly allocated to three dietary groups, homogeneous for live weight and gender (40 rabbits/group), and housed in single wire net cages (600 x 250 x 330 mm) until 80 days of age, when they were weighted and slaughtered. The study was replicated with identical experimental designs during two consecutive cycles, for a total of 80 animals/group. Dietary groups were: Standard diet - with no supplementation (S); Standard diet + 150 ppm Vit E - positive control (E); Standard diet + 0.2% oregano (Origanum vulgare) aqueous extract (O). All diets, provided by Mignini&Petrini (Petrignano di Assisi, Perugia, Italy) were isoproteic and isoenergetic and the main ingredients were alfalfa meal, sunflower seed meal, wheat bran, barley and sugar beet pulp. The oregano extract was provided by Phenbiox (Calderara di Reno, Bologna, Italy) after an enzyme-aided extraction from leaves using water as solvent. The extracts were added to the diets by spraying during the mixing of ingredients. Feed and water were available ad libitum. The temperature and lighting schedule in the rabbitry were 15–18 °C and 16L:8D, respectively. In order to calculate the feed conversion ratio (FCR) and average daily gain (ADG), feed consumption were recorded daily and rabbits weight weekly. At the slaughter, blood samples (2 mL for each rabbit) were collected from the marginal ear vein of 30 rabbits/group at 80 day of age and the natural immune responses were evaluated by analyzing lysozyme (Lys), Serum Bactericidal Activity (SBA) and Haemolytic Complement Assay (HCA) in serum 5. The oxidative status was evaluated using commercially available kits (Diacron International Srl, Grosseto, Italy) that evaluates the serum’s ability to oppose the massive oxidative action of a hypochlorous acid (HClO) solution (AOP values) or the reactive oxygen metabolite concentrations (ROMs). The extent of muscle lipid peroxidation of raw Longissimus dorsi muscles (LD) was evaluated by spectrophotometer as reported by some authors 6. Oxidation products were quantified as malondialdehyde equivalents (mg/kg of muscle). Muscles were obtained from eight rabbits/group at 80 days. The data were analyzed by SPSS Dietary treatments significantly affected the live weight (LW) and ADG at the end of the trial; particularly, O fed animals had higher LW (2344 g vs 2296 and 2277 g, respectively; P<0.05) and ADG (30.7 g/d vs 29.7 and 29.2 g/d, respectively; P<0.05) compared to E and S groups; whereas, FCR was not influenced by the experimental diet. The blood oxidative status (AOP and ROMs) did not significantly varied among the different animal groups, however, the oxidative stability (TBARs) of the LD meat for all supplemented diets led to a lower TBARs content compared to the control (S) group. Indeed, the inclusion of extra vitamin E reduced TBARs of LD meat, as did supplementation with oregano extract (0.17 and 0.18 vs 0.24 mg MDA/kg meat, respectively. P<0.05). A better natural immune response was observed in O and E vs S groups which showed significantly higher HCA (74.9 and 69.6 vs 45.4, respectively; P<0.05) and SBA (26.4 and 28.5 vs 15.8, respectively; P< 0.05) values. The HCA assay is very useful for assessing the onset risk of infections or the gravity of ongoing diseases [7]. SBA, in particular, expresses the serum capacity to counteract the GRAM- bacterial growth [8]. This study showed that an adequate phytogenic additive dietary supplementation in growing rabbits can exert a positive effect on productive performance, natural immune responses and give protection against meat lipid oxidation

Influence of Dietary Supplementation with Prebiotic, Oregano Extract, and Vitamin E on Fatty Acid Profile and Oxidative Status of Rabbit Meat

The effect of dietary supplementation with vitamin E, oregano, and prebiotic on fatty acids and oxidative profiles of rabbit meat (loin and hind leg) was evaluated. New Zealand white rabbits weaned at 30 days of age were fed with one of six diets until 80 days of age: standard diet includingω3 polyunsaturated fatty and conjugated linolenic acids sources (S) and five diets adding vitamin E (150 ppm, E), oregano water extract (2 g/kg feed diet, O), prebiotic (THEPAX® 1.5 g/kg feed diet, T), vitamin E plus prebiotic (TE), and oregano water extract plus prebiotic (TO), respectively. The lipid oxidative status (TBARS) showed lower values with respect to S, mainly when vitamin E was administered. In particular, all the experimental diets decreased TBARS values with respect to the control group in the loin, but no effect was found in the hind leg. In all feed samples, the amounts of fatty acid classes increased in the following order: polyunsaturated fatty acids > monounsaturated fatty acid > saturated fatty acid. The dietary supplementations did not affect the fatty acid composition of meat. The experimented diets compared to the control were not able to provide a selective increase of bioactive fatty acid in meat samples; however, the six nutritional strategies led to highly nutritional rabbit meat with an interesting value of theω6/ω3 ratio

Effect of pasture availability and genotype on welfare, immune function, performance and meat characteristics of growing rabbits

[EN] To analyse the effect of pasture availability and genotype on innate immunological status,morphological organisation of lymphoid follicles, behaviour, performance and carcass and meat characteristics, 80 growing rabbits (40 Leprino of Viterbo and 40 New Zealand White, NZW) were reared in bicellular standard cages (control) or in a wired pen, provided with an external grass pasture (pasture). Blood samples and behaviour observations (10 rabbits per group) were performed at different ages (weaning, 49 and 89 d). At the end of the trial, 10 rabbits per group were slaughtered to study meat quality/composition and vermiform appendix structure. Leprino rabbits showed higher serum lysozyme values than NZW for all ages and rearing systems. Leprino rabbits showed the highest values in caged animals (29.6 and 32.4 mg/mL, respectively at 49 and 89 d of age), while NZW animals did so in the pen (2.2 and 0.00 g/mL, respectively at 49 and 89 d of age). Haemolytic Complement Assay increased with age in Leprino (43.7 vs. 48.6 and 51.2 μg/mL, respectively for cage and pen), but decreased in NZW (68.6 vs. 25.8 and 41.1 μg/mL, respectively for cage and pen). Plasma TBARs was always higher in Leprino rabbits (16.0 vs. 7.0 μmol malondialdehyde/L at 29 d of age; 17.9 vs. 8.0 μmol malondialdehyde/L at 49 d of age; 20.0 vs. 11.4 μmol malondialdehyde/L at 89 d of age), whereas plasma tocopherol showed an inverse trend (32.9 vs. 46.6 mg/L at 29 d of age; 32.5 vs. 44.4 mg/L at 49 d of age; 31.2 vs. 42.4 mg/L at 89 d of age). Mortality rate of Leprino rabbits was highest in the cage system, while mortality was highest in NZW housed in the pen. Productive performance, carcass traits and fatty acid composition of meat were strongly affected by genotype and rearing system. Regarding genotype effect, Leprino showed lower daily gains (31.9 and 29.6 vs. 44.2 and 40.0 g, respectively for cage and pen system), live (2563 and 2418 vs. 2902 and 2650, respectively for cage and pen system) and carcass weights (1561 and 1465 vs. 1763 and 1580, respectively for cage and pen system). Pasture availability improved the meat nutritional quality and, in particular, the n-6/n-3 ratio was optimal and the total tocopherol content was suitable to assure a good oxidative stability.Mugnai, C.; Dal Bosco, A.; Cardinali, R.; Rebollar, PG.; Moscati, L.; Castellini, C. (2014). Effect of pasture availability and genotype on welfare, immune function, performance and meat characteristics of growing rabbits. World Rabbit Science. 22(1):29-39. doi:10.4995/wrs.2014.1342SWORD293922

Dactinomycin induces complete remission associated with nucleolar stress response in relapsed/refractory NPM1-mutated AML

Acute myeloid leukemia (AML) with mutated NPM1 accounts for one-third of newly diagnosed AML. Despite recent advances, treatment of relapsed/refractory NPM1-mutated AML remains challenging, with the majority of patients eventually dying due to disease progression. Moreover, the prognosis is particularly poor in elderly and unfit patients, mainly because they cannot receive intensive treatment. Therefore, alternative treatment strategies are needed. Dactinomycin is a low-cost chemotherapeutic agent, which has been anecdotally reported to induce remission in NPM1-mutated patients, although its mechanism of action remains unclear. Here, we describe the results of a single-center phase 2 pilot study investigating the safety and efficacy of single-agent dactinomycin in relapsed/refractory NPM1-mutated adult AML patients, demonstrating that this drug can induce complete responses and is relatively well tolerated. We also provide evidence that the activity of dactinomycin associates with nucleolar stress both in vitro and in vivo in patients. Finally, we show that low-dose dactinomycin generates more efficient stress response in cells expressing NPM1 mutant compared to wild-type cells, suggesting that NPM1-mutated AML may be more sensitive to nucleolar stress. In conclusion, we establish that dactinomycin is a potential therapeutic alternative in relapsed/refractory NPM1-mutated AML that deserves further investigation in larger clinical studies

Fraisinib: a calixpyrrole derivative reducing A549 cell-derived NSCLC tumor in vivo acts as a ligand of the glycine-tRNA synthase, a new molecular target in oncology

Background and purpose: Lung cancer is the leading cause of death in both men and women, constituting a major public health problem worldwide. Non-small-cell lung cancer accounts for 85%–90% of all lung cancers. We propose a compound that successfully fights tumor growth in vivo by targeting the enzyme GARS1.Experimental approach: We present an in-depth investigation of the mechanism through which Fraisinib [meso-(p-acetamidophenyl)-calix(4)pyrrole] affects the human lung adenocarcinoma A549 cell line. In a xenografted model of non-small-cell lung cancer, Fraisinib was found to reduce tumor mass volume without affecting the vital parameters or body weight of mice. Through a computational approach, we uncovered that glycyl-tRNA synthetase is its molecular target. Differential proteomics analysis further confirmed that pathways regulated by Fraisinib are consistent with glycyl-tRNA synthetase inhibition.Key results: Fraisinib displays a strong anti-tumoral potential coupled with limited toxicity in mice. Glycyl-tRNA synthetase has been identified and validated as a protein target of this compound. By inhibiting GARS1, Fraisinib modulates different key biological processes involved in tumoral growth, aggressiveness, and invasiveness.Conclusion and implications: The overall results indicate that Fraisinib is a powerful inhibitor of non-small-cell lung cancer growth by exerting its action on the enzyme GARS1 while displaying marginal toxicity in animal models. Together with the proven ability of this compound to cross the blood–brain barrier, we can assess that Fraisinib can kill two birds with one stone: targeting the primary tumor and its metastases “in one shot.” Taken together, we suggest that inhibiting GARS1 expression and/or GARS1 enzymatic activity may be innovative molecular targets for cancer treatment

Withdrawal of mechanical ventilation in amyotrophic lateral sclerosis patients: a multicenter Italian survey

Background: Law 219/2017 was approved in Italy in December 2017, after a years-long debate on the autonomy of healthcare choices. This Law, for the first time in Italian legislation, guarantees the patient's right to request for withdrawal of life-sustaining treatments, including mechanical ventilation (MV). Objective: To investigate the current status of MV withdrawal in amyotrophic lateral sclerosis (ALS) patients in Italy and to assess the impact of Law 219/2017 on this practice. Methods: We conducted a Web-based survey, addressed to Italian neurologists with expertise in ALS care, and members of the Motor Neuron Disease Study Group of the Italian Society of Neurology. Results: Out of 40 ALS Italian centers, 34 (85.0%) responded to the survey. Law 219/2017 was followed by an increasing trend in MV withdrawals, and a significant increase of neurologists involved in this procedure (p 0.004). However, variations across Italian ALS centers were observed, regarding the inconsistent involvement of community health services and palliative care (PC) services, and the intervention and composition of the multidisciplinary team. Conclusions: Law 219/2017 has had a positive impact on the practice of MV withdrawal in ALS patients in Italy. The recent growing public attention on end-of-life care choices, along with the cultural and social changes in Italy, requires further regulatory frameworks that strengthen tools for self-determination, increased investment of resources in community and PC health services, and practical recommendations and guidelines for health workers involved