BMB Reports 2018; 51(11): 557-562
Potential roles of reactive oxygen species derived from chemical substances involved in cancer development in the female reproductive system
Soo-Min Kim, Kyung-A Hwang*, and Kyung-Chul Choi*
Laboratory of Biochemistry and Immunology, College of Veterinary Medicine, Chungbuk National University, Cheongju 28644, Korea
Correspondence to: *Corresponding authors. Kyung-Chul Choi, Tel: +82-43-261-3664; Fax: +82-43-267-3150; E-mail:; Kyung-A Hwang, Tel: +82-43-249-1745; Fax: +82-43-267-3150; E-mail:
Received: March 18, 2018; Revised: April 10, 2018; Accepted: June 18, 2018; Published online: November 30, 2018.
© Korean Society for Biochemistry and Molecular Biology. All rights reserved.

cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Reactive oxygen species (ROS) are major sources of cellular oxidative stress. Specifically, cancer cells harbor genetic alterations that promote a continuous and elevated production of ROS. While such oxidative stress conditions could be harmful to normal cells, they facilitate cancer cell growth in multiple ways by causing DNA damage and genomic instability, and ultimately by reprogramming cancer cell metabolism. This review provides up to date findings regarding the roles of ROS generation induced by diverse biological molecules and chemicals in representative women’s cancer. Specifically, we describe the cellular signaling pathways that regulate direct or indirect interactions between ROS homeostasis and metabolism within female genital cancer cells.

Keywords: Apoptosis, Cancer development, Choriocarcinoma cell, Ovarian and endometrial cancers, Reactive oxygen species

Oxidative stress is caused by an imbalance in reactive oxygen species (ROS). The regulation of ROS homeostasis plays a major role in cellular growth, metabolism, and survival (1). When present at low levels, ROS is an important signaling molecule that can maintain cellular functions such as viability, migration and apoptosis (2). However, the excessive occurrence of ROS causes biological systems to incompletely detoxify the reactive intermediates and to block the normal functions of biomolecules (3). Both ROS and oxidative stress are considered to be involved in aging (4), inflammation (5), and many diseases, including cancer because ROS plays a significant role in the post-transcriptional adjustment of genes and repercussion effects on cellular development, differentiation, proliferation, apoptosis and the development and progression of cancer (6, 7).

Furthermore, excessive ROS may affect women’s diseases occurring in reproductive organs (8). Endometriosis has been found to be correlated with proinflammatory mediators and ROS, which can lead to cellular proliferation and activation of ERK1/2 (9). In addition, the toxic effects of ROS have been shown to induce malignancy of ovarian cancer (OC) through reduced expression of antioxidant enzymes (10).

This review describes the adaptive mechanisms that cancer cells in women’s reproductive organs take to face oxidative stress conditions. We will discuss the role of ROS induced by diverse biological molecules and chemicals in regulating the related signaling pathways and consequential oxidative stress-mediated responses in female reproductive cancers occurring in organs such as the placenta, ovary, and endometrium.


Oxidative stress has been reported to affect all phases of the oncogenic process including initiation, promotion, and progression (11, 12). Under the impact of ROS in the cancer development stage (Fig. 1), ROS can induce altered expression of several transcription factors associated with regulating pathways such as genetic mutations, proliferation, suppression, differentiation, and senescence (8, 13).

A variety of chemical substances and naturally occurring chemicals can mediate carcinogenesis, malignant behavior, and treatment response in cancer development via regulation of ROS imbalance. For instance, several studies have shown that cancer cells induce apoptosis or necrosis of damaged cells to maintain homeostasis of ROS and prevent ROS-induced toxicity. This process is thought to be the initiation of cancer development (13). Moreover, when the oxidative stress state of cells persists from the imbalance of ROS, DNA damage and induction of mutations affect cellular signaling pathways (14, 15), leading to the activation of a variety of protein kinases that regulate diverse cellular functions including the cell cycle, survival, migration, angiogenesis, apoptosis and cell death (16). The infinite cell proliferation capacity of cancer cells has an effect on angiogenesis related mechanisms (17), which can induce cancer metastasis by promoting cancer progression-associated processes such as proliferation, migration, and tube formation (18).

Generally, there are a variety of ways to treat cancer, including surgery, chemotherapy, radiation, immunotherapy, and other targeted therapies. Among them, chemotherapy and radiation therapy lead to the generation of ROS with strong toxicity to cancer cells (19). Specifically, it has been reported that the production of ROS also affects mitogen-activated protein kinases (MAPK) (20) that act as a switch to block or transmit signals because of the phosphorylation of surrounding proteins. Moreover, activation of the MAPK pathway can result in apoptosis via death signals including the c-Jun N-terminal kinase (JNK) pathway and caspase family (21). The cancer cells that continue to proliferate tend to induce DNA damage and to elicit cell cycle arrest (22, 23). Therefore, excessive production of ROS can provoke cell cycle arrest, apoptosis, and senescence. Additionally, ROS is known to be correlated with malignant progression of cancer cells by increasing invasion and metastatic potentials via MAPK signals (13). ROS-stimulated growth factors and Ras (renin-angiotensin system) in cancer cells play a role in inducing activation of the MAPK pathway, and the activated Ras-MAPK pathway has been shown to lead to cell proliferation (24, 25) and extracellular matrix (ECM) alteration via the upregulation of specific matrix metalloproteinases (MMPs) (26). The upregulated MMP then leads to the invasion via degradation of ECM (27). Successively, the decomposed ECM collapses the layer structures and then enables cancer cells to migrate. Therefore, ROS has been shown to activate the MAPK pathway leading to cancer progression and dissemination (24, 28).

Most of the tumorigenic activities of ROS are associated with regulation of transcription factors such as activator protein 1 (AP-1), nuclear factor-κB (NF-κB), nuclear factor erythroid 2–related factor 2 (Nrf2), and hypoxia-inducible factor-1α (HIF-1α), as well as intercellular adhesion protein-1 (ICAM-1) and p53 (29). Moreover, diverse in-depth molecular regulatory mechanisms of ROS-induced cellular reactions under pathological conditions, including cancer, have been reported in previous reviews (13, 30). In this review, we will focus on cellular modulations induced by chemicals or natural substances-induced formation of ROS in women’s cancers.



Human placenta related to pregnancy can develop and lead to specialized fetal trophoblasts; therefore, it plays an important role in implantation and development of the maternal-fetal interface (31, 32). Choriocarcinoma (CC) is a rare cancer occurring in the trophoblastic cells and cytotrophoblast, which form a chronic membrane of the placenta (33). The form of CC is known to be a malignant trophoblastic tumor that quickly spreads to the organs from the uterus. The metastasis of CC occurs via hematogenous routes to the liver, brain, etc., although the most common site is the lungs (34).

Commonly, chemotherapy has a significant curative influence on CC. However, drugs generally used in cancer therapy have barriers such as drug resistance and side effects. Therefore, patients with refractory gestational CC do not have an optimistic outlook when being treated with chemotherapy (35). Chemotherapy and radiation therapy to remove cancer cells usually increase intracellular ROS and damage many other biomolecules (36, 37). Moreover, the cellular ROS concentrations may have been implicated in the selective activation of transcription factors, and either cell death or cell proliferation may result from exposure to oxidative stress (38). Here, we provide representative examples that show cellular adjustment to oxidative stress induced by chemical agents in CC.

Huovinen et al. evaluated the effects of diuron as an endocrine disruptor, which produced adverse development and reproductive effects in BeWo cells (a human CC model). Moreover, diuron appeared to produce ROS and to inhibit cell proliferation of BeWo cells because the protein expression of p53 as a biomarker for cell stress and p21 as a cell cycle arrest gene was increased by oxidative stress (39, 40). A study by Ham et al. revealed that silibinin, a flavonolignan with anti-cancer effects extracted from seeds of milk thistles, significantly inhibited proliferation and induced apoptosis in both JAR and JEG3 CC cells by increasing ROS production and lipid peroxidation. Moreover, silibinin interrupted mitochondrial function by inducing mitochondrial membrane potential and permeabilization of calcium ion efflux in these cancer models (41).

As another phytochemical, coumestrol was shown to induce cell death by regulating ERK1/2 MAPK and JNK MAPK signaling pathways through disruption of Ca2+ and ROS homeostasis. Specifically, coumestrol suppressed proliferation and increased apoptosis of JAR and JEG3 cells by inducing the pro-apoptotic proteins, Bax and Bak, via ROS production and lipid peroxidation. Coumestrol also induced depolarization of MMP and increased cytosolic and mitochondrial Ca2+ levels in JAR and JEG3 cells, leading to apoptosis of CC cells through regulation of cell signaling and mitochondrial-mediated functions with a potential to impair progression of the cancer (42). A similar study evaluated the effects of chrysophanol, an anthraquinone compound, on JAR and JEG-3 cells. These results showed that chrysophanol decreased cell viability and induced apoptosis, while increasing oxidative stress in JEG-3 cells by inducing ROS generation followed by mitochondrial dysfunction, including depolarization of the mitochondrial inner membrane potential. In this experiment, the ERK1/2 and AKT signaling pathways were significantly activated in JEG-3 cells by ROS (42).

In another study, benzo(a)pyrene decreased cell viability and induced cell cycle arrest by increasing the ROS level in CC cells. The increased ROS levels enabled induction of apoptosis and simultaneous activation of endoplasmic reticulum (ER) stress (43). These studies confirm that ROS induced by diverse stimuli plays an important role in the induction of apoptosis in CC cells.

However, another study showed that formaldehyde and benzene increased the proliferation and migration of JEG-3 cells and epithelial mesenchymal transition (EMT) during ROS production (43). In this case, the increased level of ROS promoted the cancer progression of CC, unlike in previous studies. Taken together, these findings suggest that ROS-related mechanisms in CC are associated with cancer progression as well as cell death of CC.

Ovarian cancer

Ovarian cancer is the fourth most common cause of cancer death in gynecological malignancies (44) and the second most diagnosed cancer among gynecologic malignant tumors (45). Ovarian cancer develops through the formation of a neoplasm in tissues of an ovary, and epithelial ovarian cancer is a major type of cancer (46, 47). Most advanced stage cancers originate from epithelial cells, although some originate from serous, mucinous, or endometrioid cells into the surface epithelium of the ovary or fallopian tube (48). The representative metastatic sites of OC are the endometrium, breast, colon, and stomach, and OC migrates through the body’s blood stream and lymph fluid (49). Most cases of OC are difficult to treat because they are diagnosed at highly advanced stages (45, 50, 51). The advanced stage of OC is closely associated with high levels of ROS, which produces a large amount of hydrogen peroxide, whereas oxidative stress is induced in the oxidizing environment of the tumor (52).

Zet et al. previously sought to determine the effects of inhibiting intracellular ROS generation in epithelial ovarian cancer (EOC) cells. As a result, treatment with diphenyleneiodonium (DPI), a ROS inhibitor, significantly induced apoptosis in EOC cells by increasing caspase-3 activity. Moreover, DPI treatment resulted in reduced NADPH oxidase, SOD3 and HIF-1α levels in EOC cells (10), indicating that lowering oxidative stress, possibly through the inhibition of NADPH oxidase, induces apoptosis in OC cells.

Endometrial cancer

Endometrial cancer (EC) is a representative malignant gynecologic carcinoma that is the most common cancer in women except for breast cancer (53). The majority of endometrial malignancies (95%) occur in endometrial glands and are known as endometrial cancers. The remaining 5% occur in mesenchymal tumors and are known as carcinosarcoma (mixed epithelium/epilepsy tumor) (54).

Because of early symptoms such as abnormal uterine bleeding or pelvic pain, EC is often diagnosed at an early stage. However, this cancer, which is characterized by endometrial and lymphatic invasion, sometimes manifests as biologically aggressive mutations (55). Molecular alterations can induce cellular regulations, which play an important role in the development of EC (53).

Ellipticine, an alkaloid isolated from Apocyanaceae plants, has been shown to induce apoptosis in RL95-2 human EC cells via ROS formation. Ellipticine-induced apoptosis was found to be associated with the arrest of cells in the G2/M phase and accompanied by depolarization of the mitochondrial membrane potential, release of cytochrome c and apoptosis-inducing factor (AIF) from the mitochondrial membrane and activation of caspase. In this case, ROS accumulation was shown to activate the ERK and JNK pathway and finally to release AIF in the RL95-2 cells (56).

(−)-Epigallocatechin-3-gallate (EGCG), the major polyphenol in green tea, has been shown to have anti-proliferative potential on human Ishikawa endometrial cancer cells. In this process, EGCG inhibited ERK and its downstream transcription factors fos and jun through marked enhancement of ROS and activation of p38 in Ishikawa cells. These results suggest that inhibition of ERK activation and induction of apoptosis through ROS generation and p38 activation may affect the pathway to inhibit proliferation (57). Similar effects have been reported in the study using HEC-1A EC cells, in which ROS induced apoptosis and inhibition of cell growth (58).

The analysis of proteins under the Ets variant 5 (ETV5)-related proteome approach in the HEC-1A cell line reinforced the role of transcription factor in the regulation of metastatic and invasive tumor behavior in EC and showed a regulatory response to oxidative stress associated with endometrial invasion enhancement (59). Based on this research, it can be assumed that ROS production affects pathways involved in metastasis or invasion in EC cells.


Oxidative stress is known to be related to the pathogenesis of various malignant cancers, and this review specifically discussed the effects of biomolecules associated with ROS production in representative female cancers. We focused on ROS effects on apoptosis and cell proliferation in CC, OC, and EC.

First, we reviewed that the occurrence of ROS is crucial to the development of cancer (initiation, promotion, and progression) as shown in Fig. 1. Initiation, the first step, was shown to maintain the homeostasis of ROS against imbalance of ROS and to regulate protein kinases, which have diverse cellular functions. Promotion, the second step, is related to DNA damage and induction of mutations appearing in cellular signaling pathway by ROS. Progression, the third step, appears to activate EMT-related genes and other intracellular signaling pathway markers by ROS.

According to a great deal of research data, the formation of ROS indicates various responses in gynecological cancers through activation of the signal transduction pathway as shown in Table 1. The current pathological evidence suggests that there is a correlation between the production of ROS and the progression of female cancers.

Currently, there is a need for further investigation to understand the biological and pathological features of ROS in female cancers because ROS-related effects are not uniform, and are instead associated with cancer progression and cancer cell death depending on the cancer types and ROS formation conditions. Therefore, understanding how the imbalance of ROS regulation affects the developmental tendency of cancer can help develop strategies that interfere with cancer development. Further information regarding this content will provide useful predictive factors and potential therapeutic targets for female cancer patients undergoing chemotherapy related to ROS intervention.


This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Ministry of Education, Science and Technology (MEST) of the Republic of Korea (2017R1D1A1A09000663). In addition, this work was also supported by a grant (no.317021-03-1-CG000) from the Korea Institute of Planning and Evaluation for technology in Food, Agriculture and Forestry, Republic of Korea.


The authors have no conflicting interests.

Fig. 1. Relationship between ROS production and cancer cell development. Initiation, the first step among three stages in cancer, maintains the homeostasis of ROS against imbalance of ROS and regulates protein kinases, which have diverse cellular functions. Promotion, the second step, is related to DNA damage and induction of mutations appearing in the cellular signaling pathway. Progression, the third step, appears to activate EMT-related genes and other intracellular signaling pathway markers. Therefore, the generation of ROS is crucial to the three developmental stages of cancer; initiation, promotion, and progression.

Outcomes of various biomolecular pathways resulting from the production of ROS in gynecological cancers

CancerBiomolecular process related to ROSReference
Choriocarcinoma cancer• Inhibition of cell proliferation via cell cycle arrest and mitochondrial dysfunction(3941)
• EMT through controlling the cell cycle and migration ability(43)
Ovarian cancer• Apoptosis through inhibition of NADPH oxidase(10)
Endometrial cancer• Apoptosis via activation of the ERK and JNK pathways(56, 58)
• Inhibition of cell proliferation via activation of p38(57)
• Metastasis or invasion via EMT-related transcription factors(59)

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