Meat Intake on Bladder Cancer Incidence

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This entry is adapted from the peer-reviewed paper 10.3390/cancers14194775

Bladder cancer (BC) represents the second most common genitourinary malignancy. The major risk factors for BC include age, gender, smoking, occupational exposure, and infections. The BC etiology and pathogenesis have not been fully defined yet. Since catabolites are excreted through the urinary tract, the diet may play a pivotal role in bladder carcinogenesis. Meat, conventionally classified as “red”, “white” or “processed”, represents a significant risk factor for chronic diseases like cardiovascular disease, obesity, type 2 diabetes, and cancer. In particular, red and processed meat consumption seems to increase the risk of BC onset. The most accepted mechanism proposed for explaining the correlation between meat intake and BC involves the generation of carcinogens, such as heterocyclic amines and polycyclic aromatic hydrocarbons by high-temperature cooking.

bladder cancer red meat processed meat white meat prevention diet carcinogenesis

1. Introduction

Bladder cancer (BC) is the 10th most common malignant tumor diagnosed with a higher incidence in men worldwide ^[1]^[2]. Every year approximately 573,000 new cases are diagnosed, and more than 213,000 patients die of BC globally ^[3]^[4]. The BC incidence increases with age, and it is strongly associated with male gender, with men four times more frequently affected than women ^[5]. The main risk factors for BC are tobacco smoking and occupational exposure to aromatic amines (benzidine, 4-aminobiphenyl, 2-naphthylamine, 4-chloro-o-toluidine), polycyclic aromatic hydrocarbons and chlorinated hydrocarbons, accounting for 50% and 10% of all BC cases, respectively. The main sources of occupational exposure are industries involved in the production of dye, paint, metal and petroleum ^[6]. Radiation, pharmacologic agents (e.g., cyclophosphamide, pioglitazone) and arsenic exposure by drinking water also play an important role in BC etiology; in particular, the chlorination of drinking water is potentially carcinogenic. However, these factors do not fully explain BC occurrence ^[7]. Chronic Schistosoma infection is also responsible for BC onset and explains the high incidence of cancer in Egypt and other North African countries where this parasite is endemic ^[8].

Most chemical carcinogens need to be metabolically activated before becoming carcinogenic. Therefore, in addition to the intrinsic reactivity of its electrophilic derivatives, a chemical substance’s carcinogenic potential is also affected by the equilibrium between metabolic activation and inactivation reactions. Most known carcinogens are metabolized by cytochrome P-450 dependent monooxygenases.

Carcinogen exposure induces DNA damage that may result in DNA sequence alterations (mutations). Induced mutations could represent initiating events in cancer onset, when the damage occurs in oncogenes or tumor suppressor genes. Subsequently, once proliferation is induced by exposure to additional chemical agents, such as food factors, the DNA further undergoes mutations thus prompting cell transformation and tumor formation.

A relevant risk factor for BC development is polymorphism within genes coding for enzymes involved in xenobiotic biotransformation (i.e., Phase I and II reactions). In Phase I reactions, hydrophilic groups are introduced or exposed to render xenobiotics more hydrophilic and more easily excreted. In Phase II reactions (conjugation), xenobiotic is conjugated to a molecule (for example glucuronic acid), thus making it more water-soluble ^[9]^[10]. Some polymorphisms in genes encoding for Phase I (i.e., cytochrome p450) and Phase II components (i.e., glutathione S-transferase M1-GSTM1 and N-acetyltransferase 2-NAT2) have been associated with an increased BC risk ^[11]. However, no study has thoroughly evaluated the relationship between meat consumption and the genetic variations in the heterocyclic amines (HCA) metabolic pathways on BC risk ^[10].

Considering that nutrients or their catabolites are excreted through the urinary tract and come in contact with the bladder mucosa, diet could influence bladder carcinogenesis. Consequently, the identification of dietary factors associated with BC onset could aid in prevention ^[12]^[13].

Although literature data are controversial, a healthy diet could reduce the risk of many diseases including BC. In recent years, a protective effect of flavonoids and of the Mediterranean diet, in reducing the BC risk has been observed ^[14]^[15]. One possible explanation is that fruits and vegetables are rich in polyphenols, carotenoids and vitamins C and E, which work as antioxidants to prevent DNA oxidation by neutralizing reactive oxygen species ^[16].

Meat, conventionally classified as red, white or processed, despite being rich in saturated fat and cholesterol, provides the intake of a number of vitamins and minerals such as vitamin B, vitamin A, zinc and iron. In addition, it offers a broad array of proteins and essential amino acids ^[17]^[18]. In recent years, meat consumption has gradually increased worldwide, with the highest levels observed in Europe and the lowest in Southeast Asia and Africa. It has been estimated that in Europe, meat average intake for adults was 35 g/day, with the highest value in Austria (about 110 g/day) ^[19].

Throughout the past century, dietary practices have changed significantly. Europe has no exceptions, as nutritional preferences had significantly altered over time. Since the 1960s, meat consumption has constantly risen in the majority of nations, reaching a peak from the 1980s to the present, with the availability of meat products which increased of 204% between 1960 and 2010, compared with an increased meat consumption of up to 500% (1992–2016). If protein availability in the 1960s was predominantly plant-based today, up to 58% of protein availability comes from animal-derived foods; animal products currently make up the majority of protein sources (28 g of protein per person per day), contributing 30% of all calories consumed. Poultry and pig meats have seen the biggest increase in consumption among the various types of meat available on market ^[20].

2. Meat Consumption and Carcinogenesis: Exploring the Pathophysiology

In October 2015, the International Agency for Research on Cancer (IARC), analyzing epidemiological studies on the association between colorectal cancer and consumption of red or processed meat, classified the first as “probably carcinogenic to humans” (Group 2A) and the second as “carcinogenic to humans” (Group 1) ^[21].

Several mechanisms have been proposed to explain the carcinogenic potential of red and processed meat. Among them, the most accredited mechanisms involve the formation of chemical carcinogens during meat cooking (pan-fried, grilled/barbequed, oven-broiled, microwaved, other) and processing. Red meat and processed meat contain pro-carcinogenic compounds that are transformed into carcinogens, such as HCAs and polycyclic aromatic hydrocarbons (PAHs), during high-temperature or open-flame cooking ^[22]. PAHs are carcinogens because their metabolically activated intermediates form covalent bindings to DNA, leading to adduct formation ^[23]. Cytochrome P450 (CYPs) enzymes, CYP1A1 and CYP1B1 are involved in PAHs bioactivation ^[24]. More than 30 PAHs have been identified and, Benzo(a)pyrene (BaP) which is classified as a Group 1 human carcinogen, is the most toxic PAH in meat ^[17]. BaP, as well as all PAHs, acts as exogenous ligands of the nuclear translocator complex of the cytosolic aryl hydrocarbon receptor (AhR)–aromatic receptor nuclear translocator complex, increasing the expression of CYP450 family genes ^[24].

PAHs, in particular BaP, also exert a carcinogenic effect by downregulating or upregulating microRNA ^[25].

HCAs, similarly to PAHs, form covalent DNA adducts. Currently, about 25 HCAs, divided into amino-imidazo-azarenes and carbolines or pyrolytic HCAs, have been identified in cooked meat. HCAs formation depends on processing temperature; the optimal cooking temperature for HCA formation is between 150 and 200 °C ^[26]. The 2-amino-1-methyl-6-phenylimidazo(4,5b)pyridine (PhIP) and 2-amino-3,8-dimethylimidazo(4,5-f)-quinoxaline (MeIQx) are the HCAs most frequently found in red meat ^[27].

The final product of these reactions is the esterified N-hydroxy-HCA, obtained by CYP1A2 oxidation, subsequently acetylated and sulphated by acetyltransferases and sulfotransferases. The esterified N-hydroxy-HCA, through the nitrenium ion, can react with deoxy-guanosine of the DNA ^[28]. Additionally, a case-control study proposed that variations in the cytochrome P450 1A2-164 A/C (CYP1A2) or N-acetyltransferase 2 (NAT2) acetylator genotype may affect the relationships between consumption of red meat or meat-related mutagens and breast cancer risk ^[29].

Nitrate and nitrite, added to meat for their preservation and to enhance color and flavor, are precursors of N-Nitroso Compounds (NOCs), such as N-nitrosamines, alkylating agents that can react with DNA. Their production derives from the reaction between a nitrosating agent, produced by smoke, and a secondary amine, originating from lipid and protein degradation. Therefore, processed meat products can produce some NOCs during cooking, among which the most found are N-nitrosodimethylamine (NDMA), N-nitrosopiperidine (NPIP), N-nitrosodiethylamine (NDEA) and N-nitrosopyrrolidine (NPYR) ^[27].

In addition to exogenous NOCs derived from certain processed meats (e.g., grilled bacon), smoked fish, cheeses or beers, exposure to NOCs can be derived by endogenous mechanisms ^[30]. In fact, red meat contains heme iron, which increases the endogenous synthesis of NOCs and genotoxic free radicals in the colon, as highlighted by Bingham et al. ^[31]^[32].

Another possible explanation of the association between heme iron and cancer could be the damage caused by heme iron to the mucus barrier function thanks to the increase of mucin-degrading bacteria (e.g., Akkermansia muciniphila) ^[33]. Moreover, in addition to the direct damage on the gut microbiota, a high intake of red and processed meat can promote carcinogenesis through two compounds which can be useful to gut microbial metabolism: secondary bile acid and sulfur ^[34]. The first, produced by the anaerobic bacteria from bile acids, can increase oxidative/nitrosative stress and alter host metabolism; the second, metabolized by sulfur-reducing bacteria to hydrogen sulfide, can lead to direct DNA damage, epithelial hyperproliferation and inflammation ^[33].

2.1. The Role of Cooking and Meat Processing in Carcinogenesis

Cooking meat is a fundamental process to make it digestible, reduce contaminants (such as hormones, antibiotics, chemicals or metals) and give it flavor, juiciness and tenderness ^[35]. However, cooking meat can lead to the formation of chemicals harmful to human health by inducing chemical and physical changes ^[26].

Considering that meat cooking practices vary worldwide, currently available epidemiological studies are based on heterogeneous populations ^[36]. Consequently, it is difficult to evaluate the cooking impact on BC risk.

The most widely used methods worldwide are barbecuing, grilling, deep-frying and pan-frying.

Steaming or stewing generates low levels of carcinogens, such as HCAs or PAHs, for the low temperatures used (about 100 °C), and the same applies to roasting, not so much for the temperature (up to 200 °C), but as there is limited direct contact with a warm surface. Instead, high-temperature cooking of meat, especially grilling, barbecuing or frying, and the exposition to hot surface or to direct flame causes amino acids and creatine reaction to form a variety of heterocyclic amines (HCAs) ^[34]^[35]. To reduce the formation of carcinogens, Felton et al. suggested some methods such as microwave pretreatment followed by the disposal of the resulting liquid before frying ^[36].

Processing meat can also reduce the risk of microbial contamination and ensure a more attractive appearance to products ^[37]. In fact, in addition to the substances produced by cooking meat, processed meat may contain additional toxic substances derived from various processing methods. Meat curing and smoking are the processes most involved in forming N-nitrosamines, formed by the reaction of a nitrosating agent and a secondary amine. In meat, nitrosating agents are gaseous nitrogen oxides, derived from smoking, and sodium nitrite derived from curing ^[38]. During smoking, wood pyrolysis can also lead to the generation of PAHs, however, in recent years, there have been changes to traditional processes to reduce the amount of these substances ^[39]^[40]^[41]^[42].

2.2. Red or Processed Meat and Bladder Cancer

Red meat refers to unprocessed mammalian muscle meat, such as beef, veal, pork, lamb, mutton, horse, or goat. It is a rich source of B vitamins (B6, B12, niacin, and thiamine), fatty acids, minerals such as iron and zinc, and proteins. The composition of meat varies depending on the animal’s species, sex, age, diet, climate, and activity during its growth; similarly, the livestock production system has a big impact on the meat’s nutritional value ^[43].

Several epidemiological studies examined the correlation between red or processed meat consumption and BC development. A case-control study demonstrated that the consumption of red meat at least 5 times a week induced a 2-fold increase OR than the consumption of meat less than once a week (OR = 1.8, 95% CI: 1.1–3.0) ^[44]. However, literature data are controversial. Although in case-control study, Crippa et al. observed that red meat consumption was associated with BC risk, no association was observed in prospective studies (RR = 1.51, 95% CI: 1.13–2.02). In addition, Fei Li et al. found no significant overall association between red meat intake and BC incidence, but a 25% higher risk of BC for red meat in the populations of the American continent ^[45].

In both studies, it was evident that the BC risk was positively correlated with the consumption of processed meat (salting, fermentation, smoking or other processes). In particular, a 20% increase in the BC risk is associated with an increase of 50 g of processed meat per day (RR = 1.20, 95% CI: 1.06–1.37) ^[46]. The prospective study performed by Xu et al. found a positive association between processed red meat intake and BC risk, after adjusting for confounders (HR = 1.47, 95% CI: 1.12–1.93) ^[47].

Another case–control study by Balbi et al. showed that salted meat intake is associated with a greater risk of BC development with an OR of 2 that further doubles if the quantities of taken meat increases or subjects are long-term smokers (OR =18.3, 95% CI: 4.6–71.9) ^[48]. These results were confirmed by another case–control study conducted by De Stefani et al. (OR = 2.23, 95% CI: 1.63–3.04) ^[49].

2.3. White Meat and Bladder Cancer

The term “white meat” is typically used to identify light-colored meat before and after cooking such as poultry (e.g., chicken, turkey), and rabbit. Currently, few studies analyzed the associations between white meat consumption and BC, so it is difficult to evaluate its role in BC development.

Nevertheless, an increased white meat intake has been negatively associated with some cancer types ^[50]. This is consistent with the findings of Dianatinasab ‘s study, which showed a non-significant association between poultry and BC risk (RR = 0.77; 95% CI: 0.48–1.06) ^[51]. However, the NIH-AARP Diet and Health study reported a statistically significant decrease in BC risk associated with 10 g per day of white meat consumption (HR = 0.86; 95% CI: 0.76–0.98) ^[52]. Among the possible explanations, white meat, compared to red meat, releases less mutagenic substitutes during the cooking and contains less saturated fats and heme iron, potential inducers of oxidative stress and DNA damage ^[53]. In addition, white meat is a source rich of polyunsaturated fatty acids (PUFAs) that seem to prevent carcinogenesis through their anti-inflammatory moieties. Among PUFAs, Omega-3 (n-3) in fact inhibits the synthesis of pro-inflammatory cytokines, such as IL-1 and TNF ^[54]. However, results of epidemiological studies on the relationship between PUFAs intake and BC risk are misleading: some studies showed a null association, while others produced an inverse association ^[55]^[56].

Conversely, Michaud et al. affirmed that an increased intake of chicken without skin was positively associated with BC (RR = 1.52; 95% CI: 1.09–2.11), compared to chicken with skin (RR = 1.10; 95% CI: 0.86–1.41) ^[57]. These results could be explained by high heterocyclic amine concentrations in chicken cooked without skin, compared to chicken with skin, under the same cooking conditions ^[58].

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Achille Aveta

Crescenzo Cacciapuoti

Biagio Barone

Erika Di Zazzo

Savio Domenico Pandolfo

Felice Crocetto

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Update Date: 25 Oct 2022

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