Elsevier

Lung Cancer

Volume 82, Issue 3, December 2013, Pages 383-389
Lung Cancer

Review
Lung cancer: What are the links with oxidative stress, physical activity and nutrition

https://doi.org/10.1016/j.lungcan.2013.09.009Get rights and content

Abstract

Oxidative stress appears to play an essential role as a secondary messenger in the normal regulation of a variety of physiological processes, such as apoptosis, survival, and proliferative signaling pathways. Oxidative stress also plays important roles in the pathogenesis of many diseases, including aging, degenerative disease, and cancer. Among cancers, lung cancer is the leading cause of cancer in the Western world. Lung cancer is the commonest fatal cancer whose risk is dependent on the number of cigarettes smoked per day as well as the number of years smoking, some components of cigarette smoke inducing oxidative stress by transmitting or generating oxidative stress. It can be subdivided into two broad categories, small cell lung cancer and non-small-cell lung cancer, the latter is the most common type. Distinct measures of primary and secondary prevention have been investigated to reduce the risk of morbidity and mortality caused by lung cancer. Among them, it seems that physical activity and nutrition have some beneficial effects. However, physical activity can have different influences on carcinogenesis, depending on energy supply, strength and frequency of exercise loads as well as the degree of exercise-mediated oxidative stress. Micronutrient supplementation seems to have a positive impact in lung surgery, particularly as an antioxidant, even if the role of micronutrients in lung cancer remains controversial. The purpose of this review is to examine lung cancer in relation to oxidative stress, physical activity, and nutrition.

Introduction

Oxidative stress plays important roles in the pathogenesis of many diseases, including aging, degenerative disease, and cancer [1], and it has been shown that oxidative mechanisms have a role in the initiation, promotion and progression of carcinogenesis [2]. Lung cancer is the commonest fatal cancer whose risk is dependent on the number of cigarettes smoked per day as well as the number of years smoking, some components of cigarette smoke inducing oxidative stress by transmitting or generating Reactive Oxygen Species (ROS) [3]. Human lung cancer can be subdivided into two broad categories, small cell lung cancer (SCLC) and non-small-cell lung cancer (NSCLC), the latter is the most common type. Efficacy of exercise-training as an adjunct therapy for patients diagnosed with NSCLC both before and following pulmonary resection has been reported [4], [5]. However, physical activity can have different influences on carcinogenesis, depending on energy supply, strength and frequency of exercise loads as well as the degree of exercise-mediated oxidative stress [6].

Nutrition has also been thought to account for about 30% of cancers in Western countries, making diet second to tobacco as a preventable cause of cancer [7]. In fact, impaired nutrition and weight loss are important predictors of perioperative complications in lung cancer patients. On the other hand, micronutrient supplementation seems to have a positive impact in lung surgery [8], particularly as an antioxidant, even if the role of micronutrients in lung cancer remains controversial [9]. The purpose of this review is to examine lung cancer in relation to oxidative stress, physical activity, and diet.

Section snippets

Reactive oxygen species and NO: what are their roles?

Free radicals are reactive compounds that have one or more unpaired electrons in their valence shell [10]. Their lifetime is very short ranging from milliseconds to nanoseconds. They can mediate cell damage by extracting electrons from a stable molecule in an attempt to pair up their own electrons, thus leaving the original molecule in an unstable state. They are produced at low levels during normal physiological conditions and are scavenged by endogenous antioxidant systems. ROS represent the

ROS and lung cancer

A primary consequence of oxidative stress is lipid peroxidation, the end products of lipid peroxidation can lead to subsequent pathological consequences, particularly in lung, through the rearrangement of the lipoperoxyl radical (ROO) [16]. Oxidative DNA damage by reactive oxygen species is also thought to contribute to carcinogenesis. In fact, it has been shown that ROS-induced DNA damage involves single- or double-stranded DNA breaks, purine, pyrimidine, or deoxyribose modifications, and DNA

ROS and physical activity

To date, approximately 80 studies have been conducted investigating the effects of structured exercise training in patients following a diagnosis of cancer. Results showed that structured exercise training is a safe and well-tolerated therapeutic strategy associated with significant improvements in a broad range of cancer-related toxicities including fatigue, exercise capacity, and physical quality of life [23]. Physical activity (PA) is also associated with numerous health benefits, especially

Primary prevention

Distinct measures of primary prevention have been investigated to reduce the risk reductions of morbidity and mortality caused by lung cancer. In fact, physical activity might influence the risks for cancers at several sites, and the evidence is most consistent for colon cancer, pancreatic cancer, endometrial cancer and prostate cancer [27]. However, little is known about whether physical activity is associated with similar risk reductions in lung cancer [4], [6]. Moreover, the efficacy of

Nutrition and lung cancer

Besides the specific role of PA in primary and secondary prevention of lung cancer, many studies have focused on the effect of nutrition in modifying the risk of this pathology. It appears that a high consumption of fruits and vegetables can be an important element of primary prevention [46]. In fact, through the several potentially beneficial antioxidants, fibers, minerals, and phytochemicals fruits and vegetables contain, they may help prevent cancer and contribute to maintenance of a healthy

Perspectives

Oxidative mechanisms play a role in the initiation, promotion and progression of carcinogenesis. The past decade has witnessed an increase in clinical and research interest in the role of exercise on the incidence of lung cancer and following a cancer diagnosis. It appears that physical activity is a safe and feasible supportive intervention to improve symptom control and cardio-respiratory fitness in cancer patients with early-stage disease either during or following the completion of adjuvant

Conflict of interest statement

The authors have no conflicts of interest to declare.

Acknowledgement

The authors thank Mrs Martine Collomb for her writing assistance.

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