Milk and kefir maintain aspects of health during doxorubicin treatment in rats. - GreenMedInfo Summary
Milk and kefir maintain aspects of health during doxorubicin treatment in rats.
J Dairy Sci. 2019 Jan 16. Epub 2019 Jan 16. PMID: 30660421
L K Stewart
Doxorubicin (DOX), a powerful anthracycline antibiotic commonly used to treat a wide variety of cancers, is associated with the production of reactive oxygen species that cause oxidative damage, resulting in cardiac dysfunction. Components of dairy may have protective effects against DOX-induced cardiac damage. Kefir is a naturally fermented milk product containing antioxidants, probiotic bacteria, and yeast in addition to the protective components of dairy. We explored the effects of dietary milk and kefir on DOX-induced cardiotoxicity in rats. We used singly housed, 10-wk-old male Sprague Dawley rats assigned to 1 of 3 isocaloric diets, control (CON n = 24), milk (MLK, n = 24), or kefir (KEF, n = 24), with equivalent macronutrient profiles. After a 9-wk dietary intervention, all animals were given either a bolus injection (15 mg/kg) of DOX (CON-DOX n = 12; MLK-DOX n = 12, KEF-DOX n = 12) or saline (CON-SAL n = 12; MLK-SAL n = 12; KEF-SAL n = 12). Body weight, grip strength, echocardiographic evaluation of cardiac geometry, and cardiac function were evaluated using echocardiography at 5 d postinjection and data were analyzed using ANOVA. Survival at d 5 post-DOX injection was 92 and 100% in KEF-DOX and MLK-DOX, respectively, and 75% in CON-DOX. By the last week of the dietary intervention, and just before injection with saline or DOX, CON weighed significantly (14%) more than the MLK and KEF. The DOX treatment resulted in significant reductions in body weight; however, we found no diet× drug interactions. The DOX treatment reduced peak grip strength compared with SAL; when compared with pre-injection measures, MLK-DOX rats did not experience a significant reduction in peak grip strength compared with CON-DOX and SAL-DOX rats. Heart mass in MLK and KEF was significantly higher when compared with CON. In summary, 9 wk of milk or kefir ingestion resulted in lower body size and higher heart mass after DOX treatment. Additionally, MLK preserved peak grip strength after DOX treatment, whereas KEF or CON did not. We observed no consistent protective effects with respect to heartdimensions and function. These findings suggest that long-term milk or kefir ingestion may be helpful in optimizing health before and during doxorubicin treatment.