Emerging classes of antioxidant to cancer therapy: a review of clinical and experimental studies

This review focuses on the relationship between antioxidants and cancer therapy. Antioxidants are known to play a crucial role in reducing free radical species, which can cause oxidative damage and contribute to the aging process and the development of diseases, particularly cancer. Over the past few decades, numerous natural and synthetic antioxidants have been tested in clinical trials against oxidative stress. However, these trials have often resulted in undesirable effects. The review also discusses recent findings on oxidative stress, highlighting the production of free radicals and their associated oxidative damage at the cellular and molecular levels. It explores different classes of natural and synthetic free radical scavengers that have been studied in clinical trials. The review emphasizes that free radicals can induce oxidative stress, leading to various pathologies, including cancer. While many antioxidants have shown promise in mitigating oxidative stress in vitro systems through their free radical scavenging activity, some have yielded negative results when tested in clinical trials due to issues with metabolism and masking of their functional groups. Therefore, it is important to explore new classes of antioxidant compounds that target other biological pathways along with their radical scavenging properties. This exploration could lead to the development of more effective antioxidant therapies for cancer treatment. Overall, this review highlights the significance of antioxidants in cancer therapy while acknowledging the challenges faced in translating promising results from preclinical studies to successful clinical outcomes. The authors suggest further research into novel antioxidant compounds that can effectively mitigate oxidative stress and improve human health, especially regarding cancer treatment.

The Role of Antioxidants in Cancer Therapy: A Review

Cancer is a complex disease that has been the subject of intense research for decades. Over the years, researchers have identified various factors that can contribute to its development and progression. One such factor is oxidative stress, which occurs when there is an imbalance between pro-oxidant species and antioxidant molecules in the body. Oxidative stress can lead to cellular damage and DNA mutations, both of which are associated with cancer development. Therefore, antioxidants play an important role in reducing free radical species and mitigating oxidative damage caused by them. In this review article, we discuss the relationship between antioxidants and cancer therapy as well as recent findings on their potential therapeutic use against cancer.

What Are Antioxidants?

Antioxidants are molecules that scavenge free radicals from cells or tissues to prevent oxidative damage caused by them. Free radicals are highly reactive molecules containing unpaired electrons that can cause cellular damage through oxidation reactions. They are produced naturally during metabolic processes but may also be generated through environmental factors such as radiation or toxins from air pollution or cigarette smoke exposure [1]. Antioxidants work by donating electrons to neutralize these free radicals before they cause any harm [2].

There are two main classes of antioxidants: natural (endogenous) antioxidants found in food sources such as fruits and vegetables; and synthetic (exogenous) antioxidants developed through chemical synthesis [3]. Natural antioxidants include vitamins C and E, carotenoids, flavonoids, polyphenols, glutathione peroxidase (GPx), superoxide dismutase (SOD), catalase (CAT), etc., while synthetic ones include phenolic compounds like BHA/BHT or TBHQ [4]. Both types of antioxidants have been tested in clinical trials against oxidative stress with varying results due to issues with metabolism or masking of functional groups [5].

Oxidative Stress & Its Role In Cancer Development

Oxidative stress occurs when there is an imbalance between pro-oxidant species like free radicals and antioxidant molecules present within a cell or tissue environment [6]. This imbalance leads to increased production of reactive oxygen species (ROS) which can cause DNA mutations leading to carcinogenesis [7], inflammation resulting in tumor growth[8], angiogenesis promoting metastasis[9] etc.. It has also been observed that high levels of ROS induce apoptosis – programmed cell death – thus inhibiting tumor growth[10][11][12] . Thus it becomes clear how crucial it is for maintaining a balance between oxidants & anti-oxidants for normal functioning & preventing diseases including cancer .

Role Of Antioxidants In Cancer Therapy

Given their ability to reduce free radical species responsible for causing oxidative damage at the cellular level , numerous natural & synthetic anti-oxidant compounds have been studied over past few decades for their potential therapeutic use against cancers . While some studies have shown promising results , others have yielded undesirable effects due to issues related with metabolism & masking functional groups . For example , vitamin E was found ineffective when used alone but showed positive results when combined with other drugs like tamoxifen[13] . Similarly , GPx inhibitors were found effective against certain types of tumors but not all[14] . Thus it becomes evident that more research needs to be done into developing novel antioxidant compounds targeting different biological pathways alongwith their radical scavenging properties so as to make them more effective therapeutics against cancers .

Conclusion

In conclusion , this review highlights the significance of anti-oxidants in cancer therapy while acknowledging challenges faced while translating promising preclinical results into successful clinical outcomes . The authors suggest further exploration into new classes of antioxidant compounds targeting different biological pathways alongwith their radical scavenging properties so as make them more effective therapeutics against cancers thereby improving human health especially regarding cancer treatment .