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Dietary Connections01:23

Dietary Connections

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In biological systems, most metabolic pathways are interconnected. The cellular respiration processes that convert glucose to ATP—such as glycolysis, pyruvate oxidation, and the citric acid cycle—tie into those that break down other organic compounds. As a result, various foods—from apples to cheese to guacamole—end up as ATP. In addition to carbohydrates, food also contains proteins and lipids—such as cholesterol and fats. All of these organic compounds are used...
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Proteins: Dietary Sources and Requirements01:28

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Consuming animal-based products offers high-quality proteins that contain optimal levels and combinations of essential amino acids, crucial for tissue repair and growth. Foods like eggs, milk, fish, and most meats are a source of complete proteins. Legumes and cereals are abundant in proteins; however, they typically lack a full range of essential amino acids. As a result, they are considered incomplete protein sources. Some plant sources like soybeans, quinoa, and amaranth do contain complete...
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Carbohydrates: Dietary Sources and Requirements01:15

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Carbohydrates are predominantly obtained from plant sources. With the exception of lactose found in milk and insignificant glycogen amounts in meat, most consumed carbohydrates have plant origins. Monosaccharides and disaccharides, or sugars, can be sourced from fruits, honey, milk, sugar cane, and sugar beets. Grains and vegetables are rich in the polysaccharide starch. Two types of polysaccharides provide fiber: cellulose, which is abundant in many vegetables, forms undigestible roughage or...
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Lipids: Dietary Sources and Requirements01:18

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Lipids are an essential component of a balanced human diet. Triglycerides, which make up the majority of dietary lipids, are found in both saturated fats—commonly present in meat, dairy products, and certain tropical plants like coconut, and hydrogenated oils such as margarine and baking shortenings (trans fats)—and unsaturated fats, which are abundant in seeds, nuts, olive oil, and most vegetable oils. The main sources of cholesterol include egg yolks, various meats and organ...
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Production and Detection of Reactive Oxygen Species ROS in Cancers
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ROS-Mediated Cancer Cell Killing through Dietary Phytochemicals.

Saranya NavaneethaKrishnan1, Jesusa L Rosales1, Ki-Young Lee1

  • 1Department of Cell Biology and Anatomy, and Arnie Charbonneau Cancer and Alberta Children's Hospital Research Institutes, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada T2N 4N1.

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Summary

Reactive oxygen species (ROS) drive cancer by damaging DNA and altering cell signals. Dietary polyphenols show promise in cancer therapy by targeting cancer cells

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Oncology

Background:

  • Reactive oxygen species (ROS) are crucial in carcinogenesis, inducing genetic mutations and oxidative stress that affect cell proliferation, survival, and apoptosis.
  • Cancer cells exhibit a redox imbalance with elevated ROS levels compared to normal cells, presenting a therapeutic vulnerability.
  • Natural compounds, particularly dietary polyphenols, are investigated for cancer therapy due to their ability to restore redox homeostasis with low toxicity.

Purpose of the Study:

  • To review the generation, regulation, and signaling pathways of ROS in cancer.
  • To explore the therapeutic potential of dietary phytochemicals targeting ROS in cancer treatment.

Main Methods:

  • Literature review of ROS generation, regulation, and signaling in cancer.
  • Analysis of preclinical studies on dietary phytochemicals and their ROS-related anticancer effects.

Main Results:

  • ROS play a dual role in cancer, promoting initiation and progression but also offering a target for therapy.
  • Dietary polyphenols demonstrate antitumor effects by inducing ROS-mediated cytotoxicity in cancer cells.
  • These compounds modulate key cell signaling pathways involved in proliferation, survival, and apoptosis.

Conclusions:

  • The unique redox imbalance in cancer cells can be exploited for targeted therapies.
  • Dietary phytochemicals represent a promising avenue for developing novel cancer treatments by modulating ROS.
  • Further research into ROS-related functions of phytochemicals may lead to effective cancer therapeutics.