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Review

Status Quo of Glycosylation in Cancer: What Is, What Is Not and What Is to Be

by
Manikandan Muthu
1,
Judy Gopal
1,
Sechul Chun
1,
Anna Jacintha Prameela Devadoss
2 and
Jae-Wook Oh
3,*
1
Department of Environmental Health Sciences, Konkuk University, Seoul 143-701, Korea
2
Faculty of Biology, New Prince Shri Bhavani Senior Secondary School, Ullagaram, Chennai 600091, India
3
Department of Stem Cell and Regenerative Biotechnology, Konkuk University, Seoul 143-701, Korea
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(23), 8401; https://doi.org/10.3390/app10238401
Submission received: 26 October 2020 / Revised: 10 November 2020 / Accepted: 19 November 2020 / Published: 25 November 2020
(This article belongs to the Special Issue Glycosylation in Cancer)
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Abstract

:
Glycobiology is gaining paramount importance for its influence on diseases as a consequence of a fundamental understanding of the underlying processes involved in them. Cancer is still posing threats to human health and welfare and therapies are perpetually being sought. Glycans are selectively attached to proteins and lipids during glycosylation, and these hold anchorage positions in many important biological processes involved in cancer through their altered expression or activity upon malignant transformation. Aberrant glycosylation is well established as a hallmark of cancer, linked to tumor development and metastasis. The analytical inputs and milestones achieved and the characterization and detection of glycosylation in cancer have been summarized in this review. The milestones achieved in cancer research through inputs from glycosylation have been highlighted. With almost 70% of biopharmaceuticals being glycoproteins and almost 80% of cancer biomarkers being glycan in origin, glycosylation has a lot of say in cancer prognosis and diagnosis. The future of glycosylation in cancer and the lacunae in the smooth channelization of state-of-the-art technologies for taking this research knowledge from bench top to bedside (actual clinical settings) is speculated upon. The incorporation of cross-disciplinary integrated approaches and nano-instrumentation sophistications are proposed for achieving scaling up.

1. Introduction

Cancer is the second most common cause of mortality in developed countries. The reason for the high mortality is that mostly cancers are discovered at advanced stages [1,2,3]. Enhanced survival rates depend on early detection and delayed detection can have serious consequences. Owing to the absence of early symptoms and inhibition to seek medical investigation, most cases are diagnosed very late [4,5]. Survival rate depends on the stage when the disease is initially diagnosed. Early diagnosis and the inclusion of minimally invasive screening methods are crucial for enhancing the survival rates of cancer patients. Biomarkers are reported as an alternative/complementary strategy to histopathology or imaging techniques, providing minimally invasive predictive information [6]. In addition to these, novel biomarkers with superior diagnostic and prognostic characteristics are also in play.
Carbohydrates were considered as mere metabolites with no significant functionality. A paradigm shift is said to have occurred in the 20th century, when the action of a lectin, ricin from castor beans, was discovered to bring about agglutination of red blood cells [7]. Nowadays, it is established that other than immunogenicity, carbohydrates also impart crucial functions on the biomolecules they are attached to. Glycosylation is an essential co- and post-translational modification (PTM) occurring in cells. Glycans, carbohydrate molecules, are selectively attached to proteins and lipids during glycosylation, exhibiting control over protein folding and clearance rates, inflammation and metastasis, while functioning as biomarkers of diseases [8]. Glycosylation is involved in cell signaling, immune recognition and cell–cell interaction and plays a key role in cancer-related aspects such as cell adhesion, cell signaling, migration, interactions with the cell matrix, immune surveillance and cellular metabolism. Glycan modifications in cells or tissues take place through the synchronized action of numerous glycosylation enzymes inside the Golgi and the endoplasmic reticulum. Glycans are linked to lipids and proteins through two mechanisms namely O- and N-linked glycosylation [9,10,11].
The synthesis of aberrant glycan chains is now an established hallmark of cancer. This is a consequence of distinct alterations in the microenvironment-metabolism and in glycoprocessing enzymes [12]. These aberrations become more apparent as the tumor becomes more aggressive and translate to function as biomarkers of the disease. In this way, aberrant protein glycosylation has now become a promising source of glycobiomarkers for diagnosis and prognosis. Glycoproteins enter the circulatory system through leakage, rendering serum as a biomarker pool from a diagnostic perspective. A lot more prospective developments leading to cancer vaccines is also anticipated as a challenging perspective.
The existence of complex truncated or novel glycan structures influences ligand–receptor interactions. This further interferes with the regulation of various biological processes in the cell. Aberrant glycosylation, thus reflects cancer-inflicted alterations in glycan biosynthesis. This is rendered possible through altered expression of glycosyltransferases, glycosidases, fucosylation and sialylation. Being able to distinguish differences in the glycosylation of proteins within cancer and controls, glycobiology is established as a potential biomarker identifier [13].
This review highlights the achievements of glycosylation in cancer, diagnosis, prognosis and therapy. The analytical inputs for cancer diagnosis in the area of glycosylation and the progress from glycan-based cancer biomarkers have been summarized. The challenges against the progress of glycosylation in cancer research have been speculated upon and the future goals for exponential application-based upgrades discussed.

2. Milestones of Glycosylation in Cancer

2.1. Analytical Milestones on Glycosylation for Cancer

Conventional methods like lectin histochemistry, like traditional immunohistochemistry, have been proven as the established method for glycobiomarker identification [14]. Both techniques have been popularly used to study glycoconjugates involved in progression and metastasis of cancer. These classical methods have been successful in analyzing glycan biomarkers. However, they have limited scope when it comes to large-scale applications and are unable to cope with the developments in genomics and proteomics.
Wang et al., 2019 have elaborately reviewed analytical inputs in glycomics-based biomarker studies using: mass spectrometry (MS), capillary electrophoresis (CE), high-performance liquid chromatography (HPLC), ultra-performance liquid chromatography (UPLC) and liquid chromatography (LC-MS) [14]. We briefly present the milestones achieved in glycosylation in cancer diagnosis and prognosis through the use of these state-of-the-art technologies. LC-MS has been reported as being used to evaluate the changes in glycoproteins in the serum of cancer patients: α1-antitrypsin (A1AT) [15], α1-acid glycoprotein [16], haptoglobin (Hp) [17,18,19] and immunoglobulin G (IgG) [20]. These altered glycosylations can be correlated with cancer progression. Glycan separation prior to MS analysis, is achieved using LC coupled with MS for the characterization of the entire glycome. Hydrophilic interaction chromatography (HILIC)-LC, reverse phase (RP)-LC and porous graphitized carbon (PGC)-LC have been successfully used. Lubman et al., detected fucosylated N-glycan structures to be upregulated in hepatocellular carcinoma (HCC) in serum Hp using the HILIC-LC-MS method [21]. The same group also detected core fucosylation (CF) levels in serum α2-macroglobulin (A2MG) [22] and serum ceruloplasmin (CP) [23] using RP-LC-MS/MS, differentiating between HCC and cirrhosis patients. Iliopoulos et al., using RP-LC-MS/MS, evaluated the site-specific N-glycan changes in renal carcinoma patients prior to and subsequent to nephrectomy [24]. Using PGC-LC- tandem mass spectrometry (PGC-LC-MS/MS), Lebrilla et al., identified and determined the relative abundance of N-glycans released from human serum [25]. Rudd et al., characterized the total serum N-glycans from advanced breast cancer patients using HPLC coupled with MS. They proved that there was a distinct increase in the sialyl-Lewis X epitope (CESLEX). The sialyl-Lewis X epitope is reported to be a better indicator for breast cancer than the currently used biomarker, CA15-3, since CA15-3 is not a standalone marker [26]. CESLEX in combination with CA15-3 is reported to be useful for monitoring breast cancer patients. The Li group reported the use of HILIC-LC-MS for quantification of N-glycans in human serum proteins. This significantly improved quantification of the N-glycome compared to the existing traditional quantification methods, making it feasible for quantitative glycomics analysis for biomarker discovery [27]. A novel antibody microarray was used to analyze cancer-related epitopes sLex and sLea in the serum of colon cancer patients [28]. LC-MS determined site specific -linked oligosaccharide alterations in oesophageal cancers [29]. HPLC-based analysis of serum glycosylation revealed differences in fucosylation and sialylation in prostate cancer patients [30]. These alterations in serum glycosylation have been used to differentiate different stages of prostate cancer.
Using only 10 μL of patient serum employing quantitative matrix assisted laser desorption/ionization–quadrupole ion trap mass spectrometry (MALDI-QITMS/MS), the Lubman group reported elevated fucosylated N-glycans in Hp in pancreatic cancer [31]. They also found a distinct bi-fucosylated tetra-antennary N-glycan in HCC patients, which outperformed alpha-fetoprotein (AFP) in differentiating HCC from cirrhosis [31]. Nakagawa et al., used MALDI- time of flight-MS (MALDI-TOF-MS) to detect N-glycan structures of AFP in HCC patients [32]. The Rudd group combined HILIC-UPLC with capillary electrophoresis-laser-induced fluorescence (CE-LIF) for characterizing N-glycan serum samples rapidly within 20 min [33]. The same group used HILIC-UPLC, assigning 140 N-glycans in human serum. They reported that increased sialylation, branching, and outer-arm fucosylation and decreased high-mannosylated and bi-antennary core-fucosylated glycans could help in identifying breast cancer patients from normal patients [34]. Knezevic et al. designed a UPLC method that analyzed 864 plasma samples per day, facilitating serum-based glyco-biomarker discovery [35]. An alternative N-glycomic profiler combined DNA sequencer method was developed by Callewaert et al. [36,37], for characterizing 9-aminopyrene-1,4,6-trisulfonic acid (APTS) labeled N-glycome in bio-fluids [38,39,40] and purified proteins [41]. Gao et al., modified this method to study the N-glycan-based biomarkers in HCC, CRC, multiple myeloma, gastric cancer and extrahepatic cholangiocarcinoma [42,43,44,45,46]. They have constructed diagnostic models for the same. Several analytical techniques based on lectins including lectin blot [47,48] lectin histochemistry/cytochemisty [49,50], lectin-antibody sandwich enzyme-linked immunosorbent assay (ELISA) [51,52,53], lectin affinity chromatography [54,55], lectin microarray [56,57,58] and lectin microfluidics [59] have been used to capture specific glycans of glycoproteins [56,60,61,62]. The Gao group analyzed the diagnostic and prognostic application of fucosylated fetuin A in HCC patients using aleuria aurantia lectin (AAL)-based ELISA [63]. The Lubman group reported abnormal sialylation levels in the serum of ovarian cancer patients using sambucus nigra lectin (SNA)-based ELISA [64] and using reverse AAL-based ELISA, Lubman et al., evaluated fucosylated Hp combined CA125 in ovarian cancers, to distinguish early-stage ovarian cancer [53]. This was more accurate than CA 125 standalone. This is a brief overview of the cancer milestones attained availing of the various analytical expertise available. It is evident that the reported analytical techniques have impacted this area of research significantly and have led to noteworthy achievements. Figure 1 gives an overall outlook of the mass spectrometry-based variants that have been used for biomarker analysis.

2.2. Glycosylation for Cancer Biomarkers

Cellular glycosylation is coordinated by glycosyltransferases and glycosidases to bring about addition/modification of glycans on proteins and lipids [65]. Glycomics unravels the impact of glycosylation in cancer [66,67,68]. Enzymes may be altered because of cancer and can be linked to tumor development. 1-6-N-acetyl-glucosaminyltransferase (GnT-V) is overexpressed in various cancers and is interconnected with higher invasive potential [69], metastasis [70], vascular remodeling [71] and tumor growth [72]. Biomarkers that can result in early diagnosis and can be used to design new therapeutic strategies are now needed. This has been accomplished by targeting cancer-associated glycans.
Munkley et al., in their exhaustive and excellent review have elaborately discussed how aberrant glycosylation is closely interrelated with protein glycoforms which can be used as cancer biomarkers [73]. Aberrant glycosylation is reported to play a key role in cancer progression according to Munkley and Elliott, 2016. The same group has also documented the initiation and progression of cancer bringing about fundamental changes in the glycome [74]. Munkley et al. 2016 have reported aberrant glycosylation and have established the link between aberrant glycan composition of prostate cancer cells and disease progression [74]. Glycosylation is reported as the global target for androgen control in the case of patients suffering from prostate cancer. Aberrant CD43 has been established as a cancer biomarker. UN1 monoclonal antibodies (UN1 mAb) have been reported to be able to identify aberrant CD43 glycoforms [75]. Serological assays in clinical practices detect and quantify glycans in cancer patient’s serum. Circulating glycoconjugates are used for diagnosis, therapy monitoring, detecting disease recurrence and prognosis. Glycoconjugates, such as sialyl-Lewis A (SLea) (CA19-9), STn (sialyl Tn) (CA72-4) and mucin glycoproteins MUC1 (CA15-3) and MUC16 (CA125) [76,77,78,79], are crucial serum cancer markers. CA125, a transmembrane mucin, is currently the best biomarker for ovarian cancer. Elevated levels of CA125 have been reported in the serum of stage I ovarian cancer patients, 60 months prior to actual diagnosis [80]. High CA125 serum levels have been reported in about 80% of epithelial ovarian cancer patients [78,81]. CA125 preoperative levels help in the prognosis of ovarian cancer patients, relating to the progression or regression of cancer in the system. CA125 is also ideal for monitoring chemotherapy responses, detecting recurrence and for prognosis [82,83,84]. MUC1 is also a transmembrane mucin overexpressed in 90% of breast cancers, and it is evaluated using the CA15-3 assay. CA15-3 is useful in understanding response to anticancer therapy, and prognosis for breast cancer [85,86,87,88]. Increase in CA15-3 prior to treatment can be correlated with inadequate prognosis, pointing out a failure in treatment [85,89]. The CA19-9 assay detects sLeA in colorectal, gastric, pancreatic or biliary cancer patients, and it is most sensitive and specific with respect to pancreatic cancer [90,91]. In the case of colon cancer, patients with high CA19-9 are reported to have a four times greater mortality rate than those with lower. In gastric cancer, prior to surgery CA 19-9 behaves as a prognostic marker and for risk factor assessment for the relapse of gastric carcinoma [92,93,94,95]. The CA72-4 assay detects aberrant sialyl-Tn (STn) in the serum of patients with gastric, colorectal, pancreatic, lung and breast carcinomas [92,96,97,98,99,100,101]. CA72-4, is reported for its role as an independent prognostic factor in gastric carcinoma and in pancreatic cancer [102,103]. Carcinoembryonic antigen (CEA), is a member of a family of N-glycoproteins, its serum levels act as a marker for a wide range of human carcinomas [104,105,106,107,108]. Tuccillo et al. have published an overview of the glycosylation-linked biomarkers in their detailed review [75].
Pancreatic adenocarcinoma is a deadly form of cancer with a 5-year survival rate of <5%. Its diagnosis consists of imaging and tissue biopsy and complete surgical resection is the only curative therapy. Pancreatic cancer metastasizes early and mostly patients are diagnosed when treatment is not possible. Carbohydrate antigen CA 19-9, sLeA is the most established biomarker for this form of cancer. Other markers include truncated O-glycans (Tn and sTn), elevated sialyl Lewis X antigen (sLex), branched and fucosylated N-glycans, upregulated proteoglycans and galectins and elevated O-GlcNAcylation [109]. Glycosylation is reported to be instrumental for androgen control in prostate cancer cells. Eight glycosylation enzymes (GALNT7, UAP1, GCNT1, PGM3, ST6GalNAc1, ST6GAL1, CSGALNACT1 and EDEM3) are significantly upregulated in prostate cancer. These 8 enzymes are under an androgen receptor (AR) and are reported by Munkley to be linked to cancer-related sialyl-Tn (sTn), sialyl LewisX (SLeX), O-GlcNAc and chondroitin sulfate. AR as well as glycosylation is reported to be mediated by androgens in prostate cancer cells [110]. Importantly, AR regulates key glycosylation enzymes and synthesis of several cancer-linked glycans in prostate cancer [111]. Epithelial ovarian malignancy is the fifth most common disease in women, having the highest death rate. The membrane glycosylation of non-carcinogenic ovarian surface epithelial (HOSE 6.3 and HOSE 17.1) and serous ovarian disease cell lines (SKOV 3, IGROV1, A2780, OVCAR 3), have been contemplated. Proof has been published [112] that MGAT3 articulation might be epigenetically controlled by DNA hypomethylation, bringing about the one of a kind “bisecting GlcNAc” type N-glycans on the membrane proteins of ovarian cancer cells. Glycoenzymes as a therapeutics target for cancer patients are also under consideration [113] Glycoproteins comprise of protein tumor markers endorsed by the Food and Drug Administration (FDA), and are being applied into clinical practices. The FDA endorsed biomarkers include: MUC-1 (CA15-3/CA27.29) [114] and plasminogen activator inhibitor (PAI-1) [115], beta-human chorionic gonadotropin (Beta-hCG) [116], the biomarker of breast cancer; AFP; biomarkers of colorectal cancer [117], biomarkers of liver cancer and germ cell cancer, chromogranin A (CgA) [118], biomarkers of neuroendocrine cancer and MUC16 (CA-125) [119] and HE4 [120], biomarkers of ovarian cancer [121].
The molecular evidence of aberrant glycosylation in colorectal cancers (CRC) was explored. Venkitachalam et al., focused on re-sequencing of 430 glycosylation-related genes in patient-derived CRC cell lines and matched primary tumor tissues. They reported changes in 12 new glycosylation-related genes in colon disease [122]. Enrichment of mutations in B3GNT2, B4GALT2, ST6GALNAC2 genes associated with the biosynthesis of N-and O-linked glycans in the colon was reported. They concluded that deleterious mutations in glycosyltransferase genes are linked to aberrant glycosylation and impact on colon and other gastrointestinal cancers.
It is accepted that the acknowledgment of the widespread pertinence of glycosylation to the cancer hallmarks will progressively affect disease treatment through the advancement of new efforts to treat cancer [123]. At present, most cancer treatment protocols include radiotherapy, medical procedures, and chemotherapy. Endeavors are in progress for recognizing compelling cutting edge therapies to supplant conventional strategies [124,125]. Production of anticancer therapeutic proteins as a class of medications is dominant in the medication business, due to advances in recombinant DNA innovation [126]. Glycosylation plays a crucial role in recombinant anticancer therapeutic proteins, as most of the approved recombinant therapeutics are glycoproteins. Various methodologies have been adopted to design the Golgi’s N-glycosylation pathway to obtain human-like glycans. Several researchers have attempted to design the N-glycosylation pathway of expression systems. Among the total endorsed biopharmaceuticals, practically 70% are glycoproteins [127,128,129,130]. Numerous functions of anticancer glycoproteins are related to solubility, pharmacodistribution, pharmacokinetics, proper structural folding, binding to receptors and serum half-life of glycans [131]. The most noteworthy anticancer therapeutic recombinant proteins are mAbs, which are glycosylated in their Fc area [132].
The glycocalyx is said to drive the interaction between malignant cells and the tumor microenvironment (TME). Both glycans, glycoconjugates and the TME effectively add to cancer hallmarks, by affecting various interactions [11,133,134]. Generally, the crosstalk between neoplastic cells and the TME guarantees smooth progress of the associated processes. Glycosylation generally impacts the extrinsic apoptotic process including both TNF-Related Apoptosis Inducing Ligand (TRAIL) and Fas passing receptors, just as integrin and galectin-mediated signaling. Glycans, glycosyltransferases, and glycosidases assume significant functions in apoptosis [135] by thwarting ligand–receptor interactions [135,136]. The tumor necrosis factor (TNT)-related apoptosis-inducing ligand (Apo2L/TRAIL) advances tumor cell apoptosis through TRAIL-R1 and TRAIL-R2, whose O-glycosylation status decides its sensitivity to the ligand. In particular, GALNT14 shows a strong link to TRAIL sensitivity in pancreatic cancer, non-small-cell lung carcinoma (NSCLC) and melanoma. The expression of GALNT3 and O-glycan processing enzymes FUT3 and FUT6 is unique in CCCs. This information is useful in recognizing cancer patients who are bound to react to TRAIL-based therapies [136]. Furthermore, a lower degree of fucosylation, due to mutation of GDP-mannose-4-6-dehydratase (GMDS), expands the resistance from TRAIL-initiated apoptosis in CCC [137]. N-glycosylation has a regulatory function in TRAIL-R1-mediated apoptosis, yet not in TRAIL-R2 (without N-glycans). Defective apoptotic signaling by N-glycan-deficient TRAIL receptors is related to lower TRAIL receptor aggregation and reduced death inducing signaling complex (DISC) formation, without diminished TRAIL-binding affinity [138]. In addition, the death receptor Fas (CD95/APO-1) has two N glycosylation sites at N136 and N118 modestly influencing Fas induced apoptosis. The addition of sialic acids by ST6Gal-I in a α2-6 linkage to the N-glycans of Fas provides security against Fas-induced apoptosis in CCCs. Specifically, α2-6 sialylation of Fas hinders FasL-induced apoptosis, blockage of Fas–Fas-associated death domain (FADD) association with Fas cytoplasmic tails and inhibition of Fas internalization [139,140,141]. Also, N-deglycosylation of Fas prompts the slowing down of procaspase-8 activation at the DISC complex, with no effect on DISC formation or FADD recruitment [142].
Glycosyltransferases, otherwise called N-acetyl galactosaminyltransferase 1 (GALNT1), are reported to activate survival signals that stifle apoptosis. In particular, overexpression of N acetyl galactosaminyltransferase 1 (GALNT1) adds to aberrant glycosylation of integrin α3β1, changing the conformation of integrin heterodimers and promoting signal transduction to incite focal adhesion kinase (FAK) activation in bladder cancer cells [143]. Another significant molecular mechanism is the crosstalk among lectins and death receptors. Traditionally, the impact of galectin-3 (Gal-3) in apoptosis relies upon its subcellular localization [144,145,146,147]. O-6-sialylation of integrin β1 N-glycans, mediated by ST6Gal-I, totally impeded its recognition by Gal-3; then again, O-3-sialylation did not influence Gal-3 recognition in gastric cancer [144,148]. These perceptions unequivocally demonstrate that Gal-3 binding to glycans is dependent on sialylation. Unraveling the sialome of cancer cells is expected to give new insights on programmed cell death pathways.
The hyperglycosylated form of hCG is expressed by several tumors, like male germ cell tumors (GCTs) and choriocarcinomas [149,150]. It also influences cancer invasion [151]. High concentrations of hCG indicate adverse prognosis [149,150]. A1AT is a 52 kDa serine protease inhibitor with three glycosylation sites brought forth by hepatocytes and is upregulated in the serum of lung cancer patients [152,153,154,155]. Fucosylated haptoglobin (Fuc-Hpt) has been recognized as a promising biomarker in pancreatic cancer [156] and found to be upregulated in pancreatic cancer patient’s sera [157]. YKL-40, also known as chitinase-3-like 1 (CHI3L1) or human cartilage glycoprotein-39, is a 40 kDa secreted glycoprotein, which is also a biomarker (that has not received FDA approval) [158]. YKL-40 was reported as a prognostic biomarker in multiple myeloma (MM) [159]. Alpha-1-acid glycoprotein (AGP), a 40 kDa acute phase serum glycoprotein is reported to impact different cancers [160]. Peixotol et al., have recently published a detailed review on the influence of protein glycosylation and tumor microenvironments in driving cancer hallmarks [161].
NCT00460356 is one of the clinical trials ongoing for using the glycosylation-related knowledge in real time [162]. NCT00897962, NCT00897962 and NCT00628654 are the other ongoing clinical trials. Other than these clinical trials, not much technology transfer has been made in this direction Figure 2 gives an overview of the interlinking factors between glycosylation (aberrant glycosylation) and cancer [162].

3. Futuristic Challenges for Glycosylation in Cancers and Conclusions

As evidenced in the previous section, glycosylation has come a long way in cancer diagnosis, prognosis and therapy. However, there are evident challenges facing the future of glycosylation in cancer. Single biomarkers with moderate sensitivity and specificity for the most common cancers are yet to be identified and some biomarkers are ineffective for the early detection of cancer. Well-designed clinical validation is a prerequisite before clinical application. Bioinformatic approaches and advanced Artificial intelligence (AI) algorithms need to be applied to gain significant progress. Although there are a large number of bioinformatics resources for glycosylation research, almost nothing has been utilized towards glycosylation in cancer. The glycobiomarkers need more clinical validation before they capture the attention of major industry players. The process of validation has been very slow due to lack of suitable high-throughput tools, that are still under development. In the past few years there has been a growing concern that no single biomarker can be reliably used for cancer diagnosis. Further improvements with specific glycan binding receptors and multiplexed assays with computer-assisted pattern analysis is needed in glycobiosensor research for breakthroughs in cancer biomarker discovery [163]. Such integrated and combined approaches are needed in order to see progress in this area of research. A coalescence of all three “omics” technologies can result in the integration of protein, gene, and glycan biomarkers into multiplexed platforms, yielding viable cancer diagnostic platforms. In terms of analytical upgrading, the target of pertinent cancer-specific glycosylation as well as lectin-based capture is crucial for detection. It is strangely interesting to add here that although nanoplatforms have been able to push the detection limits and overcome sensitivity limitations, nothing much has been done to involve the nano aspects of this area. Most of the analytical work on glycosylation and cancer reported thus far are all surrounding traditional MS and a handful of MS variants only, and none include the upgraded nano-MS variants. This appears to be a sort of saturation in the research area and a lack of enthusiasm. This is a cross-disciplinary field involving analytical chemists and biologist as well as medical expertise, and is speculated to be the core reason for these broken links.
Cutting-edge achievements of techniques including MS, CE, UPLC, which focus on glycomics as well as lectin-based glyco-capture, microarray and microfluidics which focus on aberrantly glycosylated glycoproteins, have greatly accelerated the discovery and application potentialities of glycomics and glycoprotein markers in various cancers. However, it is too early now to expect that these analytical methods can deliver the anticipated glyco-biomarker revolution. Nano-integrated analytical instrumentation being the current state-of-the-art technology, will no doubt push the analytical limits towards some positive progress. This review brings to notice that none of the nano-analytical platforms have been applied to glycosylation research in the area of cancer. As in all areas of science, the rise of nano has created plenty of room for this, and there is no doubt there is much scope for enhancing glycobiological research through successful application. Maybe, nano is that what is needed to take glycosylation from benchside to bedside.
The success of future glycodiagnostics depends on the availability of new and improved nano-based glycan-binding probes. Most of today’s cancer biomarkers are proteins that are glycosylated, but as it is, they lack the sensitivity and most importantly specificity for early detection and therefore are currently not recommended for early detection. Their use is limited for prognosis [164] Except for a handful (~4) of clinical trials [162], the practical implementation of even the FDA-approved biomarkers has not been initialized. After all, it is apparent that there may be a long and challenging journey from the bench to the clinic for the glycobiomarker discovery according to Wang et al. 2019. Thus, these “sweet” molecules, with complicated physiological and pathological implications hold promising diagnostic, prognostic and therapeutic applications for the future institutional and industrial collaborations. Translation of any biological discovery to clinical applications requires a multidisciplinary team of biologists, chemists, physicists, engineers, and computer experts. This integration of skills is not found in every other organization, so successful clinical progress can only result from interactions of such an interdisciplinary expert collaboration. This review draws attention to the need for such an integrated approach to break the limitations that glycosylation research has hit in the area of cancer biomarker discovery [74,165,166,167,168] and to achieve progress.

Author Contributions

Conceptualization, writing—original draft preparation, M.M., J.G., J.-W.O.; writing—review and editing, S.C., A.J.P.D.; funding acquisition, J.-W.O. All authors have read and agreed to the published version of the manuscript.

Funding

This study was supported by grants awarded to JWO (NRF-S201801S00057 and NRF-2020R1F1A1051041) by the Basic Science Research Program through the National Research Foundation of Korea (NRF), funded by the Ministry of Education, Science and Technology.

Conflicts of Interest

The authors declare no conflict of interest.

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Figure 1. Mass spectrometry and its variants that have been reported to be used to analyze glycan-based cancer biomarkers.
Figure 1. Mass spectrometry and its variants that have been reported to be used to analyze glycan-based cancer biomarkers.
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Figure 2. Overview of aberrant glycosylation and its correlation with other hallmarks of cancer, altered expression of sialic acid, siayltransferase, sialidase, sialoproteins, fucose, fucoprotein, fucosidase, fucosyltransferase, mannose and galactose inter-correlated with cancer hallmarks like invasion, metastasis, proliferation, angiogenesis, evasion of growth suppressors, apoptosis, and replicative immortality.
Figure 2. Overview of aberrant glycosylation and its correlation with other hallmarks of cancer, altered expression of sialic acid, siayltransferase, sialidase, sialoproteins, fucose, fucoprotein, fucosidase, fucosyltransferase, mannose and galactose inter-correlated with cancer hallmarks like invasion, metastasis, proliferation, angiogenesis, evasion of growth suppressors, apoptosis, and replicative immortality.
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Muthu, M.; Gopal, J.; Chun, S.; Jacintha Prameela Devadoss, A.; Oh, J.-W. Status Quo of Glycosylation in Cancer: What Is, What Is Not and What Is to Be. Appl. Sci. 2020, 10, 8401. https://doi.org/10.3390/app10238401

AMA Style

Muthu M, Gopal J, Chun S, Jacintha Prameela Devadoss A, Oh J-W. Status Quo of Glycosylation in Cancer: What Is, What Is Not and What Is to Be. Applied Sciences. 2020; 10(23):8401. https://doi.org/10.3390/app10238401

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Muthu, Manikandan, Judy Gopal, Sechul Chun, Anna Jacintha Prameela Devadoss, and Jae-Wook Oh. 2020. "Status Quo of Glycosylation in Cancer: What Is, What Is Not and What Is to Be" Applied Sciences 10, no. 23: 8401. https://doi.org/10.3390/app10238401

APA Style

Muthu, M., Gopal, J., Chun, S., Jacintha Prameela Devadoss, A., & Oh, J. -W. (2020). Status Quo of Glycosylation in Cancer: What Is, What Is Not and What Is to Be. Applied Sciences, 10(23), 8401. https://doi.org/10.3390/app10238401

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