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 Table of Contents  
REVIEW ARTICLE
Year : 2015  |  Volume : 128  |  Issue : 11  |  Page : 1543-1548

Evidence for DNA Damage as a Biological Link Between Diabetes and Cancer


1 Department of Biological Sciences, School of Life Sciences, Shanxi University, Taiyuan, Shanxi 030006, China
2 Department of Medicine and Therapeutics, Hong Kong Institute of Diabetes and Obesity, Li Ka Shing Institute of Health Science, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong, China

Date of Submission09-Dec-2014
Date of Web Publication26-May-2015

Correspondence Address:
Dr. Shao Chin Lee
School of Life Sciences, Shanxi University, Taiyuan, Shanxi 030006
China
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Source of Support: This work was supported by direct grants to Dr. Shao Chin Lee, from Shanxi University and the Chinese University of Hong Kong, respectively., Conflict of Interest: None


DOI: 10.4103/0366-6999.157693

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  Abstract 

Objective: This review examines the evidence that: Diabetes is a state of DNA damage; pathophysiological factors in diabetes can cause DNA damage; DNA damage can cause mutations; and DNA mutation is linked to carcinogenesis.
Data Sources: We retrieved information from the PubMed database up to January, 2014, using various search terms and their combinations including DNA damage, diabetes, cancer, high glucose, hyperglycemia, free fatty acids, palmitic acid, advanced glycation end products, mutation and carcinogenesis.
Study Selection: We included data from peer-reviewed journals and a textbook printed in English on relationships between DNA damage and diabetes as well as pathophysiological factors in diabetes. Publications on relationships among DNA damage, mutagenesis, and carcinogenesis, were also reviewed. We organized this information into a conceptual framework to explain the possible causal relationship between DNA damage and carcinogenesis in diabetes.
Results: There are a large amount of data supporting the view that DNA mutation is a typical feature in carcinogenesis. Patients with type 2 diabetes have increased production of reactive oxygen species, reduced levels of antioxidant capacity, and increased levels of DNA damage. The pathophysiological factors and metabolic milieu in diabetes can cause DNA damage such as DNA strand break and base modification (i.e., oxidation). Emerging experimental data suggest that signal pathways (i.e., Akt/tuberin) link diabetes to DNA damage. This collective evidence indicates that diabetes is a pathophysiological state of oxidative stress and DNA damage which can lead to various types of mutation to cause aberration in cells and thereby increased cancer risk.
Conclusions: This review highlights the interrelationships amongst diabetes, DNA damage, DNA mutation and carcinogenesis, which suggests that DNA damage can be a biological link between diabetes and cancer.

Keywords: Cancer; Diabetes; DNA Damage; Mutation, Pathophysiological Factors


How to cite this article:
Lee SC, Chan JC. Evidence for DNA Damage as a Biological Link Between Diabetes and Cancer. Chin Med J 2015;128:1543-8

How to cite this URL:
Lee SC, Chan JC. Evidence for DNA Damage as a Biological Link Between Diabetes and Cancer. Chin Med J [serial online] 2015 [cited 2018 Nov 17];128:1543-8. Available from: http://www.cmj.org/text.asp?2015/128/11/1543/157693


  Introduction Top


Diabetes confers an increased risk for all-site cancer worldwide, except prostate cancer. [1] Among the Chinese population of Hong Kong, for example, the prevalence of diabetes was reported to be over 10% in mid 1990s with 30% higher risk for cancer in people with diabetes compared to the general population. [2],[3] With aging and declining mortality from cardiovascular-renal disease, 25% of Chinese people with type 2 diabetes now died from cancer, mainly due to liver, pancreatic, colorectal, and breast cancer. [4] Despite the health care and socio-economic burden of diabetes and cancer, the mechanisms whereby diabetes favors cancer development remain unknown. Since insulin has pro-proliferative activity and activation of insulin signaling axis has been implicated in carcinogenesis, [5] some researchers proposed that the use of insulin by diabetic patients might contribute to cancer development. [1] However, this view is controversial, as some epidemiological studies do not show a correlation between use of insulin and all-site cancer [6] while some others have even reported that use of insulin might decrease the risk for cancer. [7]

One of the typical features in carcinogenesis is DNA mutation which can be caused by DNA damage often found in people with diabetes. In this review article, we searched the literature and summarized the evidence in support of a possible linking role of DNA damage between diabetes and cancer.


  Diabetes is a Pathophysiological State of DNA Damage Top


DNA damage occurs in different forms through different mechanisms. Strand break and base modification are the most studied forms of DNA damage. DNA strand break can be detected using single cell gel electrophoresis or otherwise named comet assay. Base oxidation, i.e., the formation of 8-hydroxy-2'- deoxyguanosine (8-OHdG), the most studied form of base modification, can be quantified using specific antibody by enzyme-linked immunosorbent assay. These techniques are well-established, and assay kits are easily available and user-friendly. This review focuses on the two forms of DNA damage with relevance to diabetes and cancer.

Dandona et al. compared the levels of 8-OHdG in mononuclear cells amongst type 1 diabetic patients (n = 12), type 2 diabetic patients (n = 15) and healthy control subjects (n = 10). They found that both type 1 and type 2 diabetic patients had higher levels of 8-OHdG than the nondiabetic subjects. Production of reactive oxygen species by mononuclear cells was also significantly greater in diabetic patients than the control subjects. [8] Increased serum or urinary levels of 8-OHdG which correlated with poor glycemic control have been confirmed in both type 1 and type 2 diabetes. [9],[10],[11] In addition to DNA base oxidation, Collins, and co-workers used comet assays on white blood cells and reported higher levels of DNA strand break in people with type 1 diabetes (n = 10) compared to healthy controls (n = 10). [12] Subsequent studies have also confirmed elevated levels of DNA strand break in type 2 diabetes, which, similar to 8-OHdG levels, were correlated with poor glycemic control. [13],[14],[15]

Peripheral blood cells are often used for comet assay to detect DNA strand break while urine and serum samples are commonly used for 8-OHdG quantification. A key question is whether the results from the peripheral samples reflect the levels of DNA damage in other body tissues. To address this issue, Kushwaha et al. compared the levels of DNA strand break in lymphocytes, lung, liver, heart, aorta, kidney, and pancreas from diabetic and control rats. They found that DNA strand break was increased in all the tested tissues from diabetic rats, and the level of DNA strand break in lymphocytes was positively correlated with that in other tissues, suggesting that lymphocyte DNA strand break might be a suitable marker indicating DNA damage in internal organs. [16]


  Pathophysiological Factors in Diabetes that Can Cause DNA Damage Top


Patients with type 1 or type 2 diabetes have increased plasma levels of glucose and advanced glycation endproducts (AGEs), which are diagnostic markers for diabetes and glycemic control. Type 2 diabetic patients often have increased plasma levels of free fatty acids and insulin, due to obesity-associated insulin resistance, especially during the early stage of the disease. These pathophysiological factors in diabetes have been found to cause DNA damage in vitro, which may explain why diabetic patients have increased level of DNA damage in vivo.

High glucose/hyperglycemia

Early in 1980s, researchers have reported that a high concentration of glucose (30 mmol/L) could cause DNA strand break in cultured human endothelial cells. [17] This observation has been confirmed in a subsequent study using the mouse and human renal cells as experimental models. [18] In addition to DNA strand break, high glucose could increase the level of 8-OHdG in endothelial and tubular cells. [19],[20]

Since DNA damage is known to produce various mutations, [21] and that high glucose can promote DNA damage, the next question to ask is whether high glucose can cause or promote mutagenesis. Indeed, Zhang et al. examined the effect of high glucose on the genomic stability of phosphoribosyltransferase and thymidine kinase loci in human lymphoblastoid cell lines and reported a significant increase in mutations in both loci under high glucose. [22] Using mouse embryo as an experimental model, Lee et al. found that high glucose increased Lac I mutation in vitro and in vivo. [23] Furthermore, since high glucose can cause mutation and DNA mutation are believed to play an important role in carcinogenesis, [24] it is logical to speculate that high glucose can promote cancer development. To address this point, Berstein and Alexandrov injected carcinogen into pregnant rats via an intraperitoneal route and divided them into experimental and control groups. The rats in the experimental group drank 10% glucose in water till delivery, after which the rats and their progeny drank 5% glucose in water for 45 days. Rats in the control group and their progeny drank water alone. The authors found that the progeny of the rats in the experimental group had significantly higher incidence of tumors than those from the control group. [25] In a follow-up study, the authors investigated whether glucose could have an effect on carcinogen-induced mutation in fetal cells, as measured using in vivo/in vitro assay. They found that high glucose not only increased the frequency of mutation but also promoted the proliferation and survival of the fetal cells from the rats in the experimental group. [26] These data suggest that high glucose can promote carcinogenesis, which might be due to its DNA damaging and then mutagenic effect.

Advanced glycation endproducts

Hyperglycemia in diabetes promotes the formation of AGEs due to nonenzymatic reactions between reducing sugars and free amino groups of proteins. Subsequent reactions such as dehydration, oxidation, and condensation result in the irreversible formation of this heterogeneous group of products. Stopper et al. investigated whether AGEs were genotoxic using pig kidney cells as an experimental model, and found that AGEs could cause DNA strand break. [27] These findings were subsequently confirmed in human liver and colon cells [28] as well as mouse podocytes. [29] In addition to DNA strand break, AGEs can also trigger DNA base oxidation and promote the production of 8-OHdG in different types of cells. [30],[31]

Free fatty acids and insulin

Palmitic acid is the most common saturated free fatty acid, which is often used to represent free fatty acids in experimental studies. Beeharry et al. found that palmitic acid caused DNA strand break and apoptosis in insulin-secreting cell line and primary human fibroblasts. [32] Under these experimental conditions, the DNA damage is the main significant event, and the clinical relevance of the small incremental trend in apoptosis remains uncertain. In a proof of concept study, we quantified 8-OHdG in the culture of HCT116 colon cancer cells treated with palmitic acid at concentrations lower than 75 μmol/L. These concentrations were not toxic to the cells but increased the production of 8-OHdG in a dose-dependent manner (Lee, unpublished date). In support of these data, obese subjects who had increased risk for cancer also had increased plasma levels of free fatty acids and 8-OHdG, supporting possible causal relationships among free fatty acid, DNA damage, and cancer. [33]

In subjects with obesity and prediabetes which are associated with insulin resistance, hyperinsulinemia is a frequent phenomenon. [34] Whether insulin can cause strand break remains to be examined. However, in colon cells and human lymphocytes, insulin was found to cause base oxidation by triggering the production of reactive oxygen species. In particular, for colon cancer cells, the lowest tested and lowest active concentration of insulin in vitro was 1 nmol/L for short time treatment (i.e., 2 h) and 0.5-1 nmol/L for longer exposure. [35] In healthy human subjects, plasma insulin concentrations are in the order of 0.04 nmol/L after fasting, which can increase to 0.2 nmol/L after a meal. Pathophysiological levels of insulin can reach 1 nmol/L. Thus, the experimental results showed that insulin in pathophysiological concentrations had DNA damaging effect. [35]

As summarized in [Table 1], these common pathophysiological features in diabetes, that is, high glucose, high insulin, AGEs and free fatty acids, can individually cause DNA damage, strand break, and base oxidation, although the effect of insulin on base oxidation remains unknown. Since these pathophysiological factors frequently co-exist in type 2 diabetes during the clinical course, their potential synergistic effects on causing DNA damage is an interesting topic for exploration.
Table 1: DNA damaging effects due to the pathophysiological factors in diabetes

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  Diabetes Can Promote DNA Damage by Different Pathway Top
[Figure 1] [36],[37]

Direct (oxidative stress) pathway

Damage of DNA by reactive oxygen species can be considered as a direct pathway in diabetes-associated mutation. High serum levels of glucose, AGEs, free fatty acids, and insulin can all promote the production of reactive oxygen species found to be increased in type 2 diabetes compared to nondiabetic subjects. [38] Besides, people with diabetes had low anti-oxidative capacity such as reduced glutathione synthesis which might contribute to their proneness to oxidative damage. [39]
Figure 1: Pathways linking diabetes to DNA damage which is involved in carcinogenesis. AGEs: Advanced glycation end products; FFAs: Free fatty acids.

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Despite the high heritability of diabetes, most of the genetic factors discovered by genome-wide association studies only explained small variance of the risk in the majority of people with type 2 diabetes. [40] Interestingly, Lai et al. found that genetic variants of peroxisome proliferator-activated receptor-γ coactivator-1α (PPARGC1A) were associated with increased risk of DNA damage (urine 8-OHdG) and diabetes. [41] In this light, PPARGC1A is known to regulate mitochondrial electron transport, which generates reactive oxygen species while at the same time, activates defending enzymes against reactive oxygen species. Imbalance between these two roles of PPARGC1A can lead to oxidative stress and possibly DNA damage. In Hong Kong Chinese, type 2 diabetes-related genetic variants of HHEX, TCF7L2, and CDKAL1 have also been reported to be associated with increased all-site cancer although the underlying mechanism remains to be explored. [42]

Signaling pathway

Indirectly, DNA damage in diabetes can occur through cell signal pathways. Simone et al. [36] reported the following observations in high glucose experimental models: (1) There were associations amongst Akt phosphorylation, tuberin phosphorylation, and 8-oxodG accumulation; (2) inhibition of Akt using PI3 kinase inhibitor reduced high glucose-induced tuberin phosphorylation, and (3) anti-oxidant inhibited reactive oxygen species generation, phosphorylation of Akt and tuberin, and 8-oxodG accumulation. These results indicated that the PI3 kinase-Akt-tuberin pathway might be important for DNA oxidation damage under hyperglycemic condition. In a recent study, Habib and Liang reported over-activation of Akt with decreased protein levels of tuberin and increased 8-OHdG concentration in kidney cancer tissues from diabetic patients, compared with cancer tissues from patients without diabetes. [43] Taken together, these data support a possible role of Akt/tuberin signaling in the occurrence of DNA damage in diabetes.

DNA repair pathway

Blasiak et al. compared the efficacy of removal of damaged DNA in peripheral blood lymphocytes between type 2 diabetic patients and healthy individuals, and reported reduced efficacy of repairing DNA damage in those with diabetes. [44] DNA is sensitive to damage caused by endogenous and exogenous factors, and as such, DNA damage occurs frequently in the absence of specific disease. Thus, an effective mechanism of DNA damage repair is crucial to maintain genomic integrity. Since defective DNA repair may determine the susceptibility to carcinogenesis, [44] decreased efficiency in DNA repair is another potential factor for cancer in diabetes. [45]

Activation of Akt/tuberin pathway might down-regulate DNA repair

The Akt pathway is an important pathway implicated in cell growth which can be activated by high levels of insulin, glucose, [36] AGEs [46] and free fatty acids (palmitic acid). [47] Here, insulin [48] and high glucose [36] activate Akt to phosphorylate tuberin which allows tuberin to interact with binding protein to perform its biological function. [48] Although there are reports on associations between DNA damage and changes in Akt activity, the mechanisms underlying Akt activation and DNA damage and repair is less clear. As reviewed by Xu and coworkers, Akt activation led to suppression of ATR/Chk1 signaling by direct phosphorylation of Chk1 or TopBP1. It could also inhibit recruitment of double-strand break resection factors (i.e., RPA, Brca1, and Rad51) to DNA damage sites, leading to compromised homologous recombination repair. Thus, Akt activation may be a potential cause of DNA repair inhibition and genomic instability. [49] In a study that used in vitro and in vivo experimental models, Akt activation was shown to phosphorylate Bim1, which led to increased genomic instability and increased oncogenic potential of Bim1. [50] In the case of tuberin, its phosphorylation or inactivation through activation of Akt could decrease the gene expression of OGG1, which was also downstream of Akt activation by reactive oxygen species, resulting in accumulation of DNA damage. [36],[51],[52] While these data support a regulatory role of Akt in DNA repair, the signal mediators downstream of Akt and their interactions remain to be defined.


  DNA Damage Can Cause Mutations Top


Genome stability is important for normal cell physiology. However, DNA bases are highly vulnerable to being damaged. Intrinsically, DNA is chemically unstable in an aqueous environment. Spontaneous reactions such as hydrolysis and de-amination can occur, resulting in DNA damage. Other endogenous factors such as metabolic products and exogenous factors such as environmental chemicals can also cause DNA damage. DNA strand breaks, in particular, double strand breaks, are potentially lethal. In surviving cells, double strand break triggers break-induced replication which is known to produce DNA mutations at high frequencies. The break-induced replication and related mechanisms can cause various DNA abnormalities which include loss of heterozygosity, telomere maintenance without telomerase, nonreciprocal translocation, copy number variation, and chromosomal rearrangements. [53]

Similarly, DNA base oxidation can be harmful. [54] Take 8-OHdG as an example, it can pair with A to form situ G to T substitution, and if incorporated into DNA, it can lead to mis-pairing with dA to form A to C substitution [Figure 2]. Moreover, 8-OHdG can change DNA conformation, leading to substitution mutations by mis-pairing with dA or dT. The presence of 8-OHdG in DNA can also have epigenetic consequences such as altering the gene transcription. Unfortunately, once mis-pairing occurs in DNA, it will not be repaired effectively in cells. Although 8-OHdG is the most frequently reported DNA damage in diabetes and other diseases, it should be kept in mind that all four DNA bases are susceptible to oxidative damage. Among these changes, modifications to GC base pairs tend to be more mutagenic while modifications on AT base pairs have weaker mutagenic potential. [55] In addition to base oxidation, lipid peroxidation is also harmful, which can cause the formation of reactive aldehydes such as malondialdehyde and 4-hydroxy-2-nonenal. These products are highly reactive to protein and DNA and have been shown to be mutagenic. [56]
Figure 2: Mechanism of mutation caused by 8-hydroxy-2'-deoxyguanosine. *: Oxidized base; A: Mispaired base.

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  DNA Mutation is a Typical Feature in Carcinogenesis Top


About a century ago, Boveri speculated that cancer was a problem of cell proliferation due to chromosomal aberrations and/or mutations. [57] Indeed, with biotechnological advancement, large number of chromosomal abnormalities and DNA mutations had been demonstrated in various types of cancers. This leads to the proposal of "somatic mutation theory" to explain the mechanisms of cancer development, which considers the accumulation of somatic mutations as the origin of carcinogenesis and cancer progression. In animal models, carcinogenesis is found to involve multiple steps which include at least initiation, promotion, and progression stages. [58] DNA mutation is the main molecular feature of the initiation step which is irreversible characterized by micro-lesions such as base pair substitution and frame shift. Clinical cancer appears when cancerous cells enter the progression step where the karyotypic alteration of genomic instability and pathological features can be found. This step involves DNA macro-lesions such as DNA amplification and rearrangement.


  Can Glycemic Control Agents Reduce Cancer Risk in Diabetes? Top


If the pathophysiological factors of diabetes, notably, high blood glucose and AGEs, can contribute to the increased risk for all-site cancer in diabetes, then, we can expect that use of anti-diabetic drugs that reduce blood glucose and AGEs can also reduce cancer risk in diabetic patients. Indeed, this has been supported by epidemiological studies showing reduced cancer risk with metformin which is probably the most commonly used anti-diabetic drug. [1] In addition to its glucose-lowering effect, metformin itself can inhibit oxidative stress [59] and DNA damage. [60] Using the Hong Kong Diabetes Registry, we have also reported the association of reduced cancer risk with all anti-diabetic drugs as well as drugs such as renin-angiotensin system inhibitors and statins which have been shown to have anti-oxidant properties. [61],[62] These epidemiological observations support a relationship among diabetes, DNA damage, and carcinogenesis.


  Conclusion Top


The available data from the literature support the notion that pathophysiological metabolic factors in diabetes can cause DNA damage, making diabetes a state of DNA damage. Oxidative stress is likely the main mediator for DNA damage in diabetes. Inhibition of antioxidant capacity worsens the oxidative stress state while inhibition of DNA damage repair machinery contributes to DNA damage accumulation. DNA damage can cause mutation which plays key roles in carcinogenesis. Thus, DNA damage is possibly a biological link between diabetes and cancer. Apart from optimizing glycemic control, future cancer prevention in diabetic patients may target at inhibiting DNA damage using alternative drugs like antioxidants.

 
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