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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Gerbino, Esteban Carasi, Paula Tymczyszyn, E. Elizabeth Gómez-Zavaglia, Andrea |
| Description | Country affiliation: Argentina Author Affiliation: Gerbino E ( Center for Research and Development in Food Cryotechnology,CCT-CONICET La Plata, RA-1900,Argentina.); Carasi P ( Laboratorio de Microbiología, Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas,Universidad Nacional de La Plata,Argentina.); Tymczyszyn EE ( Center for Research and Development in Food Cryotechnology,CCT-CONICET La Plata, RA-1900,Argentina.); Gómez-Zavaglia A ( Center for Research and Development in Food Cryotechnology,CCT-CONICET La Plata, RA-1900,Argentina.) |
| Abstract | The aim of this work was to evaluate the capacity of Lactobacillus kefir strains to remove cadmium cations and protect eukaryotic cells from cadmium toxicity. Lb. kefir CIDCA 8348 and JCM 5818 were grown in a 1/2 dilution of MRS broth supplemented with Cd(NO3)2 ranging 0 to 1 mM. Growth kinetics were followed during 76 h at 30 °C by registering optical density at 600 nm every 4–10 h. The accumulated concentration of cadmium was determined on cultures in the stationary phase by atomic absorption. The viability of a human hepatoma cell line (HepG2) upon exposure to (a) free cadmium and (b) cadmium previously incubated with Lb. kefir strains was evaluated by determining the mitochondrial dehydrogenase activity. Lb. kefir strains were able to grow and tolerate concentrations of cadmium cations up to 1 mM. The addition of cadmium to the culture medium increased the lag time in all the concentrations used. However, a decrease of the total biomass (maximum Absorbance) was observed only at concentrations above 0·0012 and 0·0011 mM for strains CIDCA 8348 and JCM 5818, respectively. Shorter and rounder lactobacilli were observed in both strains upon microscopic observations. Moreover, dark precipitates compatible with intracellular precipitation of cadmium were observed in the cytoplasm of both strains. The ability of Lb. kefir to protect eukaryotic cells cultures from cadmium toxicity was analysed using HepG2 cells lines. Concentrations of cadmium greater than 3×10−3 mM strongly decreased the viability of HepG2 cells. However, when the eukaryotic cells were exposed to cadmium pre-incubated 1 h with Lb. kefir the toxicity of cadmium was considerably lower, Lb. kefir JCM 5818 being more efficient. The high tolerance and binding capacity of Lb. kefir strains to cadmium concentrations largely exceeding the tolerated weekly intake (TWI) of cadmium for food (2.5 μg per kg of body weight) and water (3 μg/l) addressed to human consumption, is an important added value when thinking in health-related applications. |
| File Format | HTM / HTML |
| ISSN | 00220299 |
| Issue Number | 3 |
| Volume Number | 81 |
| e-ISSN | 14697629 |
| Journal | Journal of Dairy Research |
| Language | English |
| Publisher | Cambridge University Press |
| Publisher Date | 2014-08-01 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Veterinary Medicine Cadmium Metabolism Lactobacillus Toxicity Cadmium Poisoning Prevention & Control Cell Survival Drug Effects Culture Media Hep G2 Cells Humans Journal Article Research Support, Non-u.s. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Medicine Animal Science and Zoology Food Science |
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