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Antitumor Activity of Yogurt Components 1.

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Yogurt consumption significantly inhibited Ehrlich ascites tumor cell counts and DNA synthesis in mice. The antitumor activity was found in the yogurt solids, but continuous feeding did not improve survival rates.

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Area of Science:

  • Oncology
  • Nutrition Science
  • Microbiology

Background:

  • Ehrlich ascites tumor is a model for studying cancer progression.
  • Dietary components, including fermented dairy products, are investigated for their potential health benefits.
  • Yogurt contains various bioactive compounds that may influence cellular processes.

Purpose of the Study:

  • To investigate the effect of yogurt consumption on Ehrlich ascites tumor growth in a mouse model.
  • To determine the specific components of yogurt responsible for any observed antitumor activity.
  • To assess the impact of yogurt feeding timing and duration on tumor inhibition and survival.

Main Methods:

  • Male Swiss mice were inoculated with Ehrlich ascites tumor cells.
  • Mice were fed either yogurt or yogurt components ad libitum.
  • Tumor cell counts and DNA synthesis were measured.
  • Yogurt was fractionated into solids and supernatant for activity assessment.
  • Feeding was initiated at different time points relative to tumor implantation.

Main Results:

  • Yogurt feeding for 7 days post-implantation significantly inhibited tumor cell counts (24-28%) and DNA synthesis (23-31%).
  • Milk or lactic acid alone did not show significant inhibitory effects.
  • The antitumor activity was localized in the solids fraction of yogurt; the supernatant had no activity.
  • Initiating yogurt feeding more than 1 day after tumor implantation reduced the inhibitory effect.
  • Continuous yogurt feeding from day 1 until death did not significantly affect mouse survival rates.

Conclusions:

  • Yogurt possesses antitumor activity against Ehrlich ascites tumor in mice, primarily attributed to its solids fraction.
  • The timing of yogurt consumption is crucial for achieving significant tumor growth inhibition.
  • While yogurt can inhibit initial tumor development, it does not enhance survival rates in this model.