@article{BrentenMorrisSaltetal.2014, author = {Brenten, Thomas and Morris, Penelope J. and Salt, Carina and Raila, Jens and Kohn, Barbara and Brunnberg, Leo and Schweigert, Florian J. and Zentek, Juergen}, title = {Energy intake, growth rate and body composition of young Labrador Retrievers and Miniature Schnauzers fed different dietary levels of vitamin A}, series = {The British journal of nutrition : an international journal devoted to the science of human and animal nutrition}, volume = {111}, journal = {The British journal of nutrition : an international journal devoted to the science of human and animal nutrition}, number = {12}, publisher = {Cambridge Univ. Press}, address = {Cambridge}, issn = {0007-1145}, doi = {10.1017/S0007114514000543}, pages = {2104 -- 2111}, year = {2014}, abstract = {Research in rodents has shown that dietary vitamin A reduces body fat by enhancing fat mobilisation and energy utilisation; however, their effects in growing dogs remain unclear. In the present study, we evaluated the development of body weight and body composition and compared observed energy intake with predicted energy intake in forty-nine puppies from two breeds (twenty-four Labrador Retriever (LAB) and twenty-five Miniature Schnauzer (MS)). A total of four different diets with increasing vitamin A content between 5.24 and 104.80 mu mol retinol (5000-100 000 IU vitamin A)/4184 kJ (1000 kcal) metabolisable energy were fed from the age of 8 weeks up to 52 (MS) and 78 weeks (LAB). The daily energy intake was recorded throughout the experimental period. The body condition score was evaluated weekly using a seven-category system, and food allowances were adjusted to maintain optimal body condition. Body composition was assessed at the age of 26 and 52 weeks for both breeds and at the age of 78 weeks for the LAB breed only using dual-energy X-ray absorptiometry. The growth curves of the dogs followed a breed-specific pattern. However, data on energy intake showed considerable variability between the two breeds as well as when compared with predicted energy intake. In conclusion, the data show that energy intakes of puppies particularly during early growth are highly variable; however, the growth pattern and body composition of the LAB and MS breeds are not affected by the intake of vitamin A at levels up to 104.80 mu mol retinol (100 000 IU vitamin A)/4184 kJ (1000 kcal).}, language = {en} } @article{FredeHenzeKhaliletal.2014, author = {Frede, Katja and Henze, Andrea and Khalil, Mahmoud and Baldermann, Susanne and Schweigert, Florian J. and Rawel, Harshadrai Manilal}, title = {Stability and cellular uptake of lutein-loaded emulsions}, series = {Journal of functional food}, volume = {8}, journal = {Journal of functional food}, publisher = {Elsevier}, address = {Amsterdam}, issn = {1756-4646}, doi = {10.1016/j.jff.2014.03.011}, pages = {118 -- 127}, year = {2014}, abstract = {The carotenoid lutein can improve human health. Since only a fraction is absorbed from food, lutein supplementation might be recommended. Emulsions could be good carrier systems to improve the bioavailability of lutein. Six different emulsifier compositions were used in this study to prepare lutein-loaded emulsions: beta-lactoglobulin, beta-lactoglobulin/lecithin, Biozate 1, Biozate 1/lecithin, Been 20 and Tween 20/lecithin. The droplet size, resistance to creaming, lutein stability, cytotoxicity and lutein uptake by HT29 cells were investigated. The whey protein beta-lactoglobulin, the whey protein hydrolysate Biozate 1 and the combination with lecithin brought the most promising results. The small droplet sizes and resistance to creaming were an indication of physical stable emulsions. Furthermore, these emulsifiers prevented oxidation of lutein. The choice of emulsifier had a strong impact on the uptake by HT29 cells. The highest lutein absorption was observed with the combination of Biozate 1 and lecithin.}, language = {en} } @article{LongardtSchmiedchenRailaetal.2014, author = {Longardt, Ann Carolin and Schmiedchen, B. and Raila, Jens and Schweigert, Florian J. and Obladen, M. and Buehrer, Christoph and Loui, A.}, title = {Characterization of the vitamin A transport in preterm infants after repeated high-dose vitamin A injections}, series = {European journal of clinical nutrition}, volume = {68}, journal = {European journal of clinical nutrition}, number = {12}, publisher = {Nature Publ. Group}, address = {London}, issn = {0954-3007}, doi = {10.1038/ejcn.2014.202}, pages = {1300 -- 1304}, year = {2014}, abstract = {BACKGROUND/OBJECTIVES: Preterm infants have low vitamin A stores at birth, and parenteral administration of high-dose vitamin A reduces pulmonary morbidity. The aim was to characterize vitamin A transport and status. SUBJECTS/METHODS: Prospective study of 69 preterm infants (median birth weight 995 g, gestational age 28 weeks), in which 51 received 5000 IU vitamin A three times per week intramuscular (i.m.) for 4 weeks and 18 infants without i.m. vitamin A served as controls. Serum retinol, retinyl palmitate, total retinol-binding protein 4 (RBP4), retinol-unbound RBP4 (apo-RBP4) and transthyretin concentrations were determined at days 3 (D3) and 28 (D28) of life. RESULTS: D3 retinol concentrations were low for the entire group (382 (285/531) nmol/l; median/interquartile range) and unrelated to gestational age. D28 retinol was unchanged in controls (382 (280/471) nmol/l), but increased in the vitamin A group (596 (480/825) nmol/l; P < 0.001). A similar pattern was observed for RBP4. The calculated retinol-to-RBP4 ratio rose in vitamin A infants (D3: 0.81 (0.57/0.94), D28: 0.98 (0.77/1.26); P < 0.01) but not in controls. In the vitamin A group, the retinol-to-RBP4 ratio was 41 in 15\% of all infants on D3 and in 45\% of infants on D28, but was <= 1 in all, but one, controls on D28. CONCLUSIONS: In preterm infants receiving a 4-week course of high-dose i. m. vitamin A, serum retinol concentrations increased by 55\%, with molar concentrations of retinol exceeding those of RBP4 in 45\% of the infants suggesting transport mechanisms other than RBP4.}, language = {en} } @article{RailaSchweigertKohn2014, author = {Raila, Jens and Schweigert, Florian J. and Kohn, Barbara}, title = {Relationship between urinary Tamm-Horsfall protein excretion and renal function in dogs with naturally occurring renal disease}, series = {Veterinary clinical pathology}, volume = {43}, journal = {Veterinary clinical pathology}, number = {2}, publisher = {Wiley-Blackwell}, address = {Hoboken}, issn = {0275-6382}, doi = {10.1111/vcp.12143}, pages = {261 -- 265}, year = {2014}, abstract = {Background Tamm-Horsfall protein (THP) is physiologically excreted in urine, but little is known about the role of THP in the diagnosis of renal disease in dogs. Objective The aim of this study was to evaluate to which extent naturally occurring renal disease affects the urinary excretion of THP. Methods Dogs were divided into 5 groups according to plasma creatinine concentration, urinary protein-to-creatinine ratio (UP/UC), and exogenous plasma creatinine clearance (P-ClCr) rates: Group A (healthy control dogs; n=8), nonazotemic and nonproteinuric dogs, with P-ClCr rates > 90mL/min/m2; group B (n=25), nonazotemic and nonproteinuric dogs with reduced P-ClCr rates (51-89mL/min/m2); group C (n=7), nonazotemic but proteinuric dogs with P-ClCr rates 53-98mL/min/m2; group D (n=8), azotemic and borderline proteinuric dogs (P-ClCr rates: 22-45mL/min/m2); and group E (n=15), azotemic and proteinuric dogs (not tested for P-ClCr). THP was measured by quantitative Western blot analysis, and the ratio of THP-to-urinary creatinine (THP/UC) was calculated. Results The THP/UC concentrations were not different among dogs of groups A-D, but were reduced in dogs of group E (P<.001). THP/UC correlated negatively with serum creatinine (P<.01) and UP/UC (P<.01), but was not significantly associated with P-ClCr. Conclusions Decreased levels of THP/UC were present in moderately to severely azotemic and proteinuric dogs. This suggests tubular injury in these dogs and that THP might be useful as urinary marker to study the pathogenesis of renal disease.}, language = {en} } @article{SchmiedchenLongardtBuehreretal.2014, author = {Schmiedchen, Bettina and Longardt, Ann Carolin and Buehrer, Christoph and Raila, Jens and Loui, Andrea and Schweigert, Florian J.}, title = {The relative dose response test based on retinol-binding protein 4 is not suitable to assess vitamin A status in very low birth weight infants}, series = {Neonatology : fetal and neonatal research}, volume = {105}, journal = {Neonatology : fetal and neonatal research}, number = {2}, publisher = {Karger}, address = {Basel}, issn = {1661-7800}, doi = {10.1159/000356773}, pages = {155 -- 160}, year = {2014}, language = {en} }