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Vitamin D axis and its role in skin carcinogenesis: a comprehensive review

Abstract

Vitamin D (VD) is a secosteroid hormone that is mainly synthesized in the skin upon exposure to UVB radiation. VD is widely known for its role in calcium metabolism; however, multiple endocrine, paracrine and autocrine functions of VD have been described, including a prominent role on carcinogenesis. In recent years, multiple associations between VD deficiency and different types of cancer have been described, supported by evidence of anti-proliferative, anti-angiogenic, pro-apoptotic, cell-differentiating and anti-invasive effects of this hormone. An immunomodulatory role of VD associated to cancer microenvironment has also been suggested. Regarding skin cancer, it has been shown that VD inhibits tumor development in basal cell carcinoma, squamous cell carcinoma, and melanoma in vitro. Some studies have suggested that lower VD levels may be a risk factor for skin cancer, while others have shown the opposite; there is also preliminary evidence on the role of VD supplementation for the prevention of melanoma in vivo. In this review, we explore the mechanisms of VD effects on carcinogenesis and the available scientific evidence of the interplay between VD and the genesis of both non-melanoma and melanoma skin cancer.

Background

Vitamin D (VD) is a secosteroid hormone that is mainly synthesized in the skin from cholesterol precursors upon exposure to UVB radiation or to a lesser degree acquired from dietary sources. Widely known for its role in calcium metabolism, multiple other endocrine, paracrine and autocrine functions of VD have been described [1], with increasing emphasis on the role in modulating the innate and acquired immunity.

In recent years, a plethora of articles have been published associating lower VD levels with the development of different cancer types (Table 1); additionally, a lower survival rate has been shown in patients with lower VD levels in some studies [2, 3]. Unfortunately, only few reports have found an impact of VD supplementation on the subsequent risk of cancer. The role of VD on the occurrence and prognosis of skin cancer has increasingly been studied, but current evidence is still controversial.

Table 1 Carcinogenic mechanism associated with vitamin D in skin cancer and other tumors

The objective of this review was to explore the emerging role of VD as potential factor for carcinogenesis, mainly focusing on its role in melanoma and non-melanoma skin cancer.

Vitamin D metabolism

VD is mainly synthesized in the skin (90%) and to a lesser extent obtained from dietary sources (10%) [1]. After exposure to UVB radiation (λ280-320 nm) a photochemical reaction converts 7-dehydrocholesterol to vitamin D3 (VD3) by epidermal basal keratinocytes [4]. VD3, as well as VD2 obtained from diet, is released to the extracellular space and then to the bloodstream, where it is captured by VD binding protein (DBP) [4]. Subsequently, VD is hydroxylyzed in hepatocytes where the hydroxylase CYP2R1 produces 25(OH)D, the major and more stable metabolite of VD commonly used to evaluate VD plasmatic status [5]. Finally, in the kidney 25(OH)D is converted to the active form 1,25(OH) 2D3 (calcitriol) by CYP27B1, which is the active form of VD. Due to its short half-life of the latter, it is not routinely measured [6]. This two enzymatic processes can also be locally made in the epidermis by keratinocytes and melanocytes [7].

A novel pathway of VD metabolism has been recently discovered, in which VD3 is directly metabolized by the hydroxylase CYP11A1 producing a number of different derivatives from VD3, some of which can be metabolized by CYP27B, producing different but active metabolites, mainly 20(OH) D3. This new pathway has been found on the placenta, adrenal glands and epidermal keratinocytes, and may play an important role in carcinogenesis due to antiproliferative and prodifferentiation effects [8].

Vitamin D levels

VD serum levels vary widely by latitude, season, age, body mass index, use of sunblock and skin pigmentation (as melanin absorbs UVB radiation inhibiting VD3 synthesis in the skin) [9, 10]. Despite VD3 can be obtained from diet (about 10% of VD), its metabolic process is not as efficient as skin VD3 synthesis (90% of VD levels): [11] VD3 from skin lasts 2-3 times longer in the serum than dietary VD3 [12]. Moreover, dietary VD3 binds only in a 60% to DBP while the remainder is rapidly cleared; in contrast up to 100% of skin synthetized VD3 can be bound to DBP. In addition, the rest of dietary VD3 is eliminated rapidly through urine [11].

The mechanism of obtaining VD3 from sunlight is also efficient: A 15 min sunlight exposure of arms and legs in a sunny day is sufficient and produces 2000-4000 UI of VD for fair-skinned Central Europeans [13] (this estimates vary according to season, latitude and ethnics) [1, 14, 15].

Vitamin D effects

Once VD is synthesized it has two main actions: First, it binds to the nuclear VD receptor (VDR), which then binds to its co-receptor RXR and form a transcription factor which activates the expression of more than 3000 genes [16]. Second, in the cell membrane VD can bind to a binding protein (PDIA3), where it regulates intracellular calcium concentration [16, 17]. The VDR is an ubiquitous receptor that is expressed by most bodily tissues including intestine, skeletal system, bone marrow, breast, prostate, brain, muscle, immune cells, keratinocytes, melanocytes and neoplastic cells [16, 18]. In the following sections, we will focus on VD's immunologic and anti-carcinogenic effects (Table 2).

Table 2 Vitamin D associated functions

Immunologic effect of VD

VD has multiple immunologic effects that result in the ability to promote protective immunity and maintain tolerance [9]. Multiple cross-sectional and epidemiological studies have shown that low levels of VD are associated with an increased risk of respiratory tract infections, tuberculosis, bacterial vaginosis and even HIV infection, among others [1922].

It is also well studied that low VD levels are associated with higher incidence and severity of several autoimmune diseases such as lupus, rheumatoid arthritis, multiple sclerosis, diabetes and inflammatory bowel disease [9]. VD plays a key role in the innate immune system antimicrobial response. VD directly enhances the transcription of cathelicidin and β-defensin, antimicrobial peptides that actively participate in immunity of skin [23].

VD also acts in B cells (inhibiting proliferation and differentiation of B cells and immunoglobulin secretion); [24] T cells (inhibiting proliferation, and hampering T cell effector responses and increasing T regulatory cells) [9, 25, 26], thus acting in the adaptive immune system, suppressing inflammatory cytokines (IL-17, IL-21) and increasing regulatory cytokine IL-10 [9]. However, effects of VD on the adaptive immune system are complex, as it also causes increases in Th1 immunity by stimulating the transcription of IFNγ, thus having antimicrobial effects. Finally, VD acts in monocytes and dendritic cells suppressing production of important inflammatory cytokines (IL-1, IL-6, IL-8, IL-12 and TNFα) in the former and inhibiting maturation and differentiation in the latter [27, 28].

Role of VD in carcinogenesis modulation

The multiple associations between VD deficiency and higher incidence and mortality due to cancer are of increasing concern, supported by the anti-proliferative, anti-angiogenic, pro-apoptotic, cell-differentiating and anti-invasive effects of this hormone [2931]. An association has been suggested between low serum VD levels and increased incidence of cancer and mortality, thus outstanding a possible prophylactic role of VD, among many others [29, 32].

Several prospective cohort studies have demonstrated that higher levels of VD are correlated with decreased risk of diagnosis of breast [33], colon [34], renal [35], hepatic [36] and tobacco-related cancers [3, 37]. Low VD serum levels also decrease specific cancer overall survival in breast, colon, hepatic, and bladder carcinomas [3]. However, when adjusting for other prognostic criteria, the association disappeared [3]. Recent studies show that patients with colon cancer and high levels of VD have lower risk of death irrespective of tumor stage [38]. In hepatic carcinoma, a prospective study demonstrated that low VD serum levels correlated with worse cirrhosis level, worse tumor stage and mortality risk [39]. Finally, the WHO in postmenopausal women demonstrated that VD and calcium supplementation reduced the risk of all cancers [40]. However new prospective cohort studies with post diagnostic VD supplementation or high baseline VD serum levels, have failed in showing improvement of all-cause or disease-specific mortality in colon, breast or prostate cancer patients [3, 41]. Therefore, the role of VD as a prophylactic therapy in multiple cancers is still a matter of debate; despite multiple studies showing preliminary evidence of VD as a risk factor for the carcinogenesis and survival in cancer patients.

The role of DBP in cancer is a new focus of research. A recent meta-analysis found a borderline but not significant association between high levels of DBP and decreased cancer risk (OR 0,57 95%CI 0,57-1) [42]. No studies on melanoma or skin cancer have been conducted to evaluate the role of DBP in this population.

Vitamin D and skin cancer

VD immunologic and carcinogenic role in skin cancer is a current point of research and may lead to important changes in management strategies of skin cancers [29].

Keratinocytes produce VD, but can also synthesize locally the active 1,25(OH) 2D form that acts in a autocrine and paracrine fashion. Skin VD synthesis is regulated according to serum calcitriol levels [29]. VD synthesis also varies by the degree of keratinocyte differentiation. Moreover, keratinocytes also express VDR, therefore they respond to calcitriol, which is known as one of the most potent regulator of epidermal differentiation. Other important function of VD is its capacity to induce formation of intercellular junctions by Protein kinase C (PKC) activation [29, 43]. It has been shown that intracellular junctions are closely associated with carcinogenesis, tumor progression and metastasis [29]. In fact, the expression of E-cadherin and B-catenin -important proteins of the intracellular junctions- are decreased in skin tumors: basal cell carcinoma (BCC), squamous cell carcinoma (SCC) and in melanoma [29, 43, 44]. Another role that has been postulated of VD in the skin is its capacity to prevent DNA-damage produced by UVB radiation [45].

It has been shown that VD inhibits Hedgehog signaling pathway, suppressing tumor development in BCC [46]. VDR-knockout mice have increased risk of BCC development after exposure to a carcinogen [47], and VD topical application inhibits BCC cell proliferation in vivo and in vitro [48]. VD has also a role in SCC carcinogenesis, as it inhibits SCC cells growth in vivo and in vitro [49]. Nested- case control studies in elderly men have shown lower incidence of non-melanoma skin cancer (NMSC) in patients with highest serum levels of 25(OH) D [50] and higher levels of 25(OH) D were associated with longer overall survival and fewer metastases [11]. Despite these findings, studies to assess the effect of VD supplementation or topical application in BCC and SCC on humans are lacking.

VD and melanoma

Vitamin D effects in vitro and in vivo

Since the 1970’s there has been evidence of an effect of VD in both melanocytes and melanoma cells. The first finding was that VD stimulates melanogenesis as it promotes tyrosinase synthesis [51]. Then in the 80’s, Colston et al. [52] discovered that VDR was found in melanoma cells, and that VD dramatically reduced cell proliferation, in a dose-response manner. 1,25(OH)2D causes arrest at the G1/S phase in tumor cell cycle, mainly by inhibiting cyclin D1 and an upregulation of p27 and p21 [53].

New findings were made showing that VD inhibits proliferation, induces differentiation of melanoma cells, and inhibits angiogenesis and invasion of melanoma cells [29] with a protective antineoplastic effect. In fact, Gupta et al. demonstrated that VD had an important role in the activation of the DNA repair mechanism after UV radiation, both in keratinocytes and in melanoma cells [54].

The effect of VD in melanoma -as in other cancers- depends of VD serum levels, DBP and the expression of VDR in tissue and its polymorphisms. Studies analyzing the association of genes coding for VD metabolizing enzymes (1 alpha-hydroxylase [CYP27B1] and 1,25(OH) (2)D-24hydroxylase [CYP24A]), and DBP found no association between polymorphisms in these genes and melanoma risk [55].

Melanoma and VDR polymorphisms

The VDR gene contains >1000 polymorphic sites [30]. The most studied in skin cancer are TaqI, BsmI, ApaI and FokI [29, 56]. FokI and BsmI have been identified as high risk alleles, and TaqI allele as a protective polymorphism in melanoma [56]. In addition, the rs4516035 allele has been reported to be a melanoma risk allele [57]. For BsmI bb genotype, recent studies show a significant association with frequency of melanoma, Breslow thickness, and even with the risk of multiple primary melanomas [58].

Melanoma and VDR expression

Recent studies have shown a negative correlation between immunohistochemical VDR expression and progression of pigmented skin lesions, as VDR immunoreactivity was strongest in normal skin > nevi > melanoma = metastasis, for both nuclear and cytoplasmic expression [59]. However, the stain graduation was more pronounced in nuclear staining. The authors explain this alterations alluding that for VD normal regulatory actions, both compartments- nuclear and cytoplasmic- are relevant. However, as nuclear VDR expression and activation leads to activation of target genes, the reduction of nuclear VDR expression could contribute to the escape of melanoma cells from homeostatic surveillance and growth control. Thus, reduction of nuclear VDR can induce some malignant features of melanoma like unlimited replicative potential or the ability to invade the dermis [56].

Furthermore, the same authors found that in melanoma, VDR cytoplasmic and nuclear immunoreactivity was lower in more aggressive nodular melanomas than in superficial melanomas. Moreover, in the melanoma cohort, the nuclear and cytoplasmic VDR immunoreactivity was associated with longer overall survival. A further study by the same authors showed that VDR cytoplasmic and nuclear expression in melanoma was inversely correlated with Breslow thickness, Clark’s level and pTNM AJCC staging [60] [57]. In addition, VDR expression was decreased in melanomas with melanization and with ulceration, but increased in those melanomas with high tumor infiltrating lymphocytes (TIL) expression. This last association could be explained because active lymphocytes could express VD and that way induce an antineoplastic activity [60]. Finally, VDR expression affected the survival of patients with melanoma [60]. Our own unpublished studies showed differential immunohistochemical expression of VDR in melanoma and nevi showing some differences with data reported in the literature (Fig. 1, panel).

Fig. 1
figure 1

VDR immunohistochemical expression in melanoma and dermal nevus. a cytoplasmic and nuclear staining for VDR in dermal nevus, AEC, 400x; b negative VDR staining in melanoma in situ, AEC, 400x; c positive VDR nuclear staining in melanoma in situ, AEC, 400x; d positive VDR nuclear staining in invasive melanoma, AEC, 400x

Serum VD levels and melanoma

Since the last decade, multiple studies have tried to evaluate the association between VD serum levels and melanoma risk and/or prognosis. However, the results have been contradictory. These discrepancies may be explained mainly because of multiple methodological differences between studies: differences in adjustment of VD by known confounding factors; differences in the assay used to determine serum 25(OH)D levels; in the cutoff point of normal-deficiency levels of VD between studies; and differences in the time of the year (seasonality) and time from diagnosis of the melanoma when VD serum levels where obtained, as some studies used 25(OH)D levels obtained even years after diagnosis of melanoma (and could reflect the increased sun awareness and protection after melanoma diagnosis).

In an effort to determine the real role of VD in melanoma pathogenesis, Caini et al. [61] made a meta-analysis and analyzed the effect of 25(OH)D baseline serum levels and the risk of melanoma genesis and of melanoma prognostic factors. They included 4 studies (392 melanoma cases), and found a borderline trend (though not significant) between lower 25(OH)D and melanoma risk. However, they did found that lower VD serum levels were inversely correlated with melanoma thickness.

Other studies have been conducted to evaluate VD levels and melanoma. Firstly, in their revision of the Leeds Melanoma Cohort with 2182 patients followed for 7 years, Newton-Bishop et al. [62] analyzed the relationship between known systemic markers of inflammation (smoking, body mass index (BMI), low 25(OH)D serum levels, and use of NSAIDs) with melanoma risk with tumor ulceration and melanoma specific survival (MSS). They found that deficient VD serum levels and smoking were significantly associated with ulceration. When multivariate analysis was made (adjusted by sex, age, tumor location and Breslow thickness) deficient 25(OH)D serum levels (<20 mmol/L vs 20-60nmol/L = HR 1,79; p = 0,009) and smoking duration significantly decreased MSS. The authors suggested, based on their results, correction of VD deficiency and smoking cessation might be of benefit for melanoma prognosis.

A cross-sectional Australian study with 100 patients with recently diagnosed melanoma and VD levels obtained at the moment of diagnosis, evaluated baseline 25(OH)D levels and melanoma prognostic factors. After a multivariate analysis adjusted for confounding factors, they found a significant association between VD deficiency (defined as <50mmol/L by the Australian Health survey) and Breslow thickness, a known factor of poorer prognosis. In fact, they found a four-fold increase in the odds of higher Breslow thickness (>0,75 mm) in association with low VD levels [63]. There was no association of 25(OH)D levels and Clark level or mitotic activity.

Saiag et al. [3] reported a prospective-cohort study with 1171 patients with melanoma followed for a mean of 4.5 years, and studied VD serum levels at diagnosis and during follow-up, in order to see if increased VD levels during follow-up improved prognosis. After adjustment of 25(OH)D levels (by age, sex, BMI, and month of blood drawn), 25(OH)D baseline levels were significantly inversely correlated with poor prognostic factors such as AJCC stage, Breslow’s thickness, and ulceration. When evaluating 25(OH)D baseline levels adjusted by prognostic factors (AJCC staging) the associations with melanoma relapse or prognosis disappeared, suggesting that VD levels were not an independent prognostic marker of melanoma. Then, they analyzed the data of 856 patients that had at least two values of VD serum levels measured, allowing calculation of an annual trend of 25(OH)D variation levels. The annual variation of 25(OH)D over time and prognosis showed a U-shape in Kaplan Meier curve, meaning that any change above or under 0.5 nmol/L per year was significantly associated with worse prognosis. Authors could explain the relationship between decreased annual trend of 25(OH)D levels and worse prognosis, assuming tumor inflammation and lower sun exposure as the main causes. But they could not explain how higher levels of VD decreased prognosis.

Vitamin D supplementation and melanoma risk and progression

There have been few studies evaluating the real usefulness of VD supplementation and how it may affect melanoma progression. Most of them have been based in cohorts that studied supplementation for other diseases and therefore the VD dosage and the adjustment by confounding factors was not accurate.

Interestingly, some studies support VD supplementation to prevent melanoma genesis. A case control study by Millen et al. [64] conducted in 503 patients and 565 controls, found a reduced risk of melanoma in patients with dietary VD intake. However, VD exposure data were collected after melanoma diagnosis, which make the results susceptible to recall bias.

With the scarce evidence available to date, supplementation with VD is not currently supported. A small case control study with 165 melanoma patients and 209 controls found no association between VD intake or supplementation and further melanoma risk [65]. In contrast, another prospective study found an increased risk between cod-liver oil consumption (600-1000 UI VD/teaspoon) and melanoma risk among women, but not men [66].

The first important epidemiological study was reported with indirect data obtained by questionnaires. The Vitamins and Lifestyle Cohort prospective study included 68,611 participants, who were assessed for VD dietary intake and/or supplementation and its association with melanoma risk [67]. Data was extracted through a baseline questionnaire of the last decade VD intake and/or supplementation. After a year of follow-up, 455 incident melanomas were identified. They found no association between VD supplementation and/or dietary intake and melanoma risk. However, this study did not measured serum VD levels nor adjusted results by other confounding risk factors.

Another indirect evidence arises from the post-hoc analysis of the WHI CaD trial [68], which included 36282 participants who were randomly assigned to receive Calcium 100mg - VD 400 UI/daily or placebo. After a mean 7-year follow up by annual questionnaire reporting of melanoma or NMSC, the analysis found no association between VD supplementation and a reduced risk of NMSC or melanoma. However, in the group of women with previous history of NMSC (a known risk factor for melanoma) [69] there was a 57% of fewer melanomas in the group who received supplementation versus placebo (HR 0.43; p = 0.026). The authors postulated that the probable main cause of lack of association between supplementation and reduced risk is that the supplementation was inadequate, as it was lower than the recommended 600 UI/d by the Institute of Medicine consensus statement, and as it only raises serum VD levels by 4ng/ml, an inadequate dose to observe clinical differences in skin cancer [68].

Consequently with these data and based in its recently systematic reviews, the US Preventive Services Task Force concluded that the current available data were insufficient to recommend VD screening in clinical practice or to assess a benefit of supplemental VD intake for the primary prevention of cancer [70].

There are ongoing clinical pilot trials evaluating VD supplementation with VD and cancer risk [71], and a specific placebo controlled pilot trial evaluating high dose VD supplementation in patients with advanced melanoma, evaluating safety of dosage and progression free survival, with promising outcomes [72].

Conclusions and future directions

For many years dermatologists have recommended patients simply avoiding sun exposure pragmatically in order to prevent the appearance of skin cancer. Recent evidence suggests a much more complex issue than initially thought and that carcinogenesis is not as simple as “more sun exposure, more skin cancer”. As VD levels are mainly regulated by sun exposure, it seems that as with any other hormone, a delicate equilibrium governs over the presence of pathology or a homeostatic healthy environment. More studies are needed in order to give patients solid evidence based recommendations of optimal 25(OH)D levels, VD supplementation, and sun exposure.

Abbreviations

AJCC:

American joint committee on cancer

BCC:

Basal cell carcinoma

BMI:

Body mass index

HIV:

Human Immunodeficiency virus

IL-1:

IL-6, IL-8, IL-10, IL-12, IL-17, IL-21, Interleukins: 1,6,8,10,12,17,21.

MSS:

Melanoma specific survival

NMSC:

Non melanoma skin cancer

NSAIDs:

Nonsteroidal anti-inflammatory drugs

PKC:

Protein kinase C

pTNM:

Pathological Tumor-node-metastasis staging

RXR:

Retinoid X receptor

SCC:

Squamous cell carcinoma

TIL:

Tumor infiltrating lymphocytes

TNFα:

Tumor necrosis factor alpha

UV:

Ultraviolet radiation

UVB:

Ultraviolet B radiation

VD:

Vitamin D

VD3:

Vitamin D3

VDBP:

Vitamin D binding protein

VDR:

Vitamin D receptor

WHO:

World Health Organization

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Funding

This investigation was funded in part by the Concurso de Fondos Interdepartamentales (CI05/14), Escuela de Medicina, Pontificia Universidad Católica de Chile.

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All authors contributed to the contents of this manuscript which was written by CP and CN, and reviewed and edited by all authors (CP, CN, MM, AB, SG). All authors read and approved the final manuscript.

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Del Puerto, C., Navarrete-Dechent, C., Molgó, M. et al. Vitamin D axis and its role in skin carcinogenesis: a comprehensive review. Appl Cancer Res 36, 5 (2016). https://0-doi-org.brum.beds.ac.uk/10.1186/s41241-016-0006-4

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