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233. Transfer of conjugated linoleic acid from sows to their offspring and its impact on the fatty acid profiles of plasma, muscle, and subcutaneous fat in piglets

Author

Peng, Y., Ren, F., Yin, J.D., Fang, Q., Li, F.N., and Li, D.F.

Subjects
Colostrum -- Properties, Fatty acids -- Physiological aspects, Linoleic acids -- Physiological aspects, Swine -- Physiological aspects, Zoology and wildlife conservation
Abstract

This experiment was conducted to determine if CLA could be transferred from sows to their offspring through the umbilical cord or milk. Eighteen pregnant Dalland sows of mixed parity were used in a completely randomized block design based on parity and BW. The sows were allotted to 1 of 3 groups and fed diets containing 0, 0.5, or 1.0% CLA during the last 50 d of gestation and throughout a 26-d lactation (n = 6). Umbilical cord blood was sampled at parturition. Colostrum and milk were collected from each sow on d 2 and 15 after farrowing. Samples of blood, backfat, and the LM were obtained from piglets at 2 and 26 d of age. Sow reproductive performance and piglet growth were not altered by CLA supplementation during the late gestation and lactation periods. The CLA supplementation of sow diets had an impact on the fatty acid profiles in colostrum and milk. Dietary CLA increased the concentrations of total SFA (linear and quadratic, P < 0.01), but reduced the total MUFA in the colostrum (linear and quadratic, P < 0.01). Although dietary CLA increased the concentrations of total SFA (quadratic, P < 0.01), it had no influence on total MUFA concentrations in the milk. In addition, feeding sows diets supplemented with CLA resulted in increases (linear and quadratic, P < 0.01) in the CLA content of plasma, backfat, and the LM in their offspring. However, trans-10, cis-12-18:2, rather than cis-9, trans-ll 18:2, was detected in the umbilical cord blood, which indicates that CLA may be transported from the sow to the fetus in an isomer-specific manner. Key words: conjugated linoleic acid, fatty acid profile, milk, piglet, plasma, transfer pattern doi: 10.2527/jas.2009-2354

Published
2010

248. The [K.sub.v] channel blocker 4-aminopyridine enhances [Ag.sup.+] uptake: a scanning electrochemical microscopy study of single living cells

Author

Zhan, Dongping, Fan, Fu-Ren F., and Bard, Allen. J.

Subjects
Aminopyridines -- Physiological aspects, Silver -- Physiological aspects, Potassium channels -- Properties, Potassium channels -- Health aspects, Anti-infective agents -- Research, Science and technology
Abstract

We report that silver ion ([Ag.sup.+]) uptake is enhanced by 4-aminopyridine (4-AP), a well known voltage-sensitive potassium ion channel ([K.sub.v]) blocker. Both bacterial (Escherichia coli) and mammalian (3T3 fibroblast) cells were used as model systems. [Ag.sup.+] uptake was monitored with a scanning electrochemical microscope with an amperometric [Ag.sup.+] ion-selective electrode ([Ag.sup.+]-ISE) and the respiration rates of E. coli cells were measured by oxygen reduction at an ultramicroelectrode. The results showed that not only the amount but also the rate of silver uptake by the cells increased significantly when 4-AP was added to the solution. For fibroblasts, the [Ag.sup.+] uptake rate was 4.8 x [10.sup.7] ions per cell per sec without 4-AP compared with 1.0 x [10.sup.8] ions per cell per sec with 0.2 mM 4-AP. For E. coli cells, the uptake rate was 1.5 x 104 ions per cell per sec without 4-AP vs. 3.5 x [10.sup.4] ions per cell per sec with 0.5 mM 4-AP and 5.9 x [10.sup.4] ions per cell per sec with 1 mM 4-AP. Thus, 4-AP might be useful where silver is used as antimicrobial agent to speed its uptake. E. coli | scanning electrochemical microscope | silver ion

Published
2008

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