Department of Medicine, University of Padua, Padua 35128, Italy.
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Hepatocellular carcinoma (HCC) is one of the most relevant sanitary problems for its prevalence and poor prognosis. This tumor is characterized by highly heterogeneous features, both at clinical and molecular level. SerpinB3 (squamous cell carcinoma antigen-1 or SCCA1) is a serine-protease inhibitor that protects cells from oxidative stress conditions, but in chronic liver damage it may lead to HCC through different strategies, including inhibition of apoptosis, induction of epithelial to mesenchymal transition, cell proliferation and invasiveness. Mechanisms of tumor growth promotion induced by SerpinB3 encompass the inhibition of intratumor infiltration of natural killer cells and the up-regulation of Myc oncogene. Recently this serpin has also been identified as a Ras-responsive factor and modulator of metabolic pathways. In the liver SerpinB3 is undetectable in normal hepatocytes, but its expression progressively increases in chronic liver diseases, dysplastic nodules and hepatocellular carcinoma, especially in those with poor prognosis, in which it could also exert immunomodulatory effects. In serum SerpinB3/4 isoforms (or SCCA) circulate bound to IgMs (SCCA-IgM) in patients with HCC, and in patients with cirrhosis their levels have been found correlated to the risk of HCC development. Preliminary findings in patients with HCC revealed that SCCA-IgM levels are predictive of HCC prognosis.
SerpinB3, chronic liver disease, hepatocellular carcinoma, chronic inflammation, SCCA-IgM
Hepatocellular carcinoma (HCC) is the most frequent primary liver cancer and is ranked as the sixth most common neoplasm and the third leading cause of cancer death worldwide. This liver tumor has been recognised as a leading cause of death among patients with cirrhosis and its incidence is expected to increase in the next future. This increase in incidence, despite the control of hepatitis B virus and hepatitis C virus infections by vaccination and treatments, is expected by the rising levels of obesity and its metabolic complications.
Despite intensive surveillance programs, considerable recent therapeutic advances and the use of potentially radical treatments, clinical outcome of HCC remains still poor, with the majority of patients presenting with advanced disease not eligible for curative therapy. These treatments are indeed applicable only for early stage tumors and include resection, liver transplantation and percutaneous ablation, while transarterial chemoembolization (TACE) and sorafenib are regarded as non-curative treatments, able to improve survival in intermediate and advanced stages, respectively. The identification of novel therapeutic targets is limited by the well-known intra-nodule and inter-nodule tumour heterogeneity and heterogeneity in tumour evolution. It is known indeed the each HCC is composed of a unique combination of somatic alterations, including genetic, epigenetic, transcriptomic and metabolic events that form its unique molecular fingerprint. The biological characteristics of the tumor are also enriched by the presence of a frequent underlying chronic liver disease that leads to a persistent exposure to chronic inflammation and oxidative stress by cirrhotic hepatocytes. In parallel to this pathological heterogeneity, gene expression profiling has allowed the establishment of several HCC transcriptomic classifications[5-7]. One of these recently identified molecular subclasses (S1) of HCC, associated with poor prognosis, is characterized by aberrant activation of Wnt signaling and transforming growth factor-beta activation. This peculiar S1 signature is characterized by overexpression of genes associated to epithelial-to-mesenchymal transition (EMT), a process originally described for embryo development and now believed to be involved in tumor invasion and metastasis and known to be regulated by TGF-beta in HCC. It is interesting to note that high levels of SerpinB3 expression were identified recently only in this subclass.
SerpinB3 (formerly known as squamous cell carcinoma antigen-1 or SCCA1) is a member of the family of serine-protease inhibitors (SERPINS). SerpinB3 and its highly homologous isoform SerpinB4 (formerly known as squamous cell carcinoma antigen-2 or SCCA2) were originally purified from a squamous cell carcinoma of the uterine cervix. They are encoded by two separate genes located on chromosome 18q21.3, which share a high degree of homology (up to 98%). The two encoded glycoproteins have a molecular weight of 45 kDa and are composed by 390 amino acids with up to 92% similar composition. SerpinB3 and SerpinB4 show distinct properties and substrate specificities: the former inhibits papain-like cysteine proteases, whereas the latter inhibits both serine and cysteine proteases. The specific function or target depends mainly on the variety of the reactive-site loop (RSL), in which only 7 out of 13 amino acid residues (54%) are identical, and this reactive site is involved in the interaction with the protease, its recognition, and cleavage, resulting in its inhibition. SERPINB3/B4 are localized predominantly in the cytosol, however, they have also been detected in other subcellular compartments including lysosomes, mitochondria, the nucleus, and may function extracellularly. The localization of SerpinB3/B4 in the nucleus probably depends on physiological state of the cell. While these isoforms are detectable only in the cytoplasm at basal state in cell lines, they have been found in the nucleus in response to UV irradiation. In addition, in clinical samples, nuclear localization of SerpinB3/B4 has been commonly reported in various types of cancers, in psoriasis and in idiopathic pulmonary fibrosis.
Regarding their tissue expression, SerpinB3/B4 are physiologically expressed in the basal and parabasal layers of normal squamous epithelium, and they are overexpressed in neoplastic cells of epithelial origin[15,16]. These proteins are frequently co-expressed in other organs, such as bladder, uterus, esophagus, lung, prostate, testis, thymus, and trachea, but the biological significance of SerpinB3/B4 in normal tissue development and function remains largely unknown.
In recent years several data revealed new biological properties of SerpinB3 in the field of liver carcinogenesis [Figure 1]. The mechanisms that could lead to a dysregulation of SerpinB3 during hepatocarcinogenesis are still largely unknown. Initial studies indicate that this molecule can be upregulated by inflammatory cytokines, namely tumor necrosis factor-alpha, as anti-apoptotic cell death response. A novel mechanism involves a selective binding of HIF-2α to SERPINB3 promoter, induced by hypoxic and oxidative stress conditions, like iron overload[18,19]. Somatic mutations affecting SerpinB3 repressor(s) cannot be excluded, however, further studies are required to explore this hypothesis.
Initial studies indicate that SerpinB3 has an anti-apoptotic effect, since in cancer cells it was found to confer resistance to drug-induced apoptosis by inhibiting lysosomal cathepsin proteases and consequent inhibition of the release of mitochondrial cytochrome c.
This serpin also displays a protective role under a variety of stress conditions, with an anti-apoptotic function unrelated to its proteinase inhibition activity. Indeed, SerpinB3 protects cells from exposure to radiation through an inhibitory effect either on the MAP family kinase JNK or p38. More recent findings have demonstrated a novel mechanism of action of SerpinB3, which could contribute to tumor cell resistance to anti-neoplastic drugs. This molecule was found located in the inner mitochondrial compartments, where its binding to the respiratory complex I protected cells from the toxicity of chemotherapeutic agents with a pro-oxidant action such as doxorubicin and cisplatin. This serpin reduced ROS generation induced by these compounds, a crucial step responsible for the opening of the mitochondrial permeability transition pore, shielding tumor cells from apoptotic death.
SerpinB3 induces cell proliferation (increasing β-catenin expression) and deregulation of adhesion processes as down regulation of E-cadherin and decrease of desmosomal junctions, leading to epithelial-to-mesenchymal transition (EMT) with increased cell invasiveness potential. Experimental studies have also reported that mice transgenic for liver SerpinB3 showed higher liver regenerative ability compared to wild-type mice, supporting a role of this protein in promoting cell growth and proliferation. Other mechanisms of tumor growth promotion induced by SerpinB3 include the up-regulation of Myc oncogene transcription with two different strategies: the first mechanism is through the intracellular SerpinB3 antiprotease activity that blocks its cleavage exerted by Calpain, preventing the generation of the non-oncogenic cytoplasmic Myc-nick form and allowing nuclear translocation of Myc with pro-oncogenic activity. The second one consists in the transcriptional induction of Myc, through the increase of Yap pathway. Furthermore, recent findings indicate that SerpinB3/SerpinB4 isoforms are a Ras-responsive factor that plays an important role in Ras-associated cytokine production and tumorigenesis.
Recent findings indicate that SerpinB3 can determine metabolic alterations in the liver through the induction of dipeptidyl peptidase-4 (DPPIV/CD26), a transmembrane glycoprotein, that is increased in various malignant tumors, including HCC, and the expression of these two molecules was found positively correlated in HCCs and in the surrounding cirrhotic tissue. Hepatoma cells overexpressing SerpinB3 showed increased DPPIV/CD26 levels and these features were associated with an increase in lipid droplet formation and with decreased glycogen deposition, typical features induced by DPPIV/CD26[30-32][Figure 2]. These results are in agreement with previous findings, reporting remarkable lipid accumulation and glycogen depletion in the liver of SerpinB3-transgenic mice. In addition, SerpinB3 was found overexpressed in human livers with NASH, a condition at risk of HCC development. It is worth to note that SerpinB3 determined also a decreased oxygen consumption rate, as a possible consequence of its physical interaction with mitochondrial respiratory complex I.
In the liver SerpinB3 and its isoform SerpinB4, are undetectable in normal hepatocytes, but their expression progressively increases in chronic liver disease, in dysplastic nodules and in HCC[36,37], suggesting their involvement in relatively early events of hepatocarcinogenesis. SerpinB3 has also been detected in hepatoblastoma, the embryonal tumor of the liver, especially in the most aggressive forms, where a direct correlation was observed between its gene expression, the up-regulation of Myc oncogene and tumor extension.
The presence of SerpinB3 has been further described in liver stem/progenitor cells positive for the hepatic epithelial cell adhesion molecule (EpCAM), both in human fetal livers and in adult livers with cirrhosis, and these findings were corroborated by the induction of this serpin in a mouse model of liver stem/progenitor cell activation. Liver tumors with stemness signature are highly aggressive, and along this line the highest levels of SerpinB3 have been found overexpressed, together with TGF-β1, in the subset of aggressive forms of hepatocellular carcinoma, characterized by early tumor recurrence after surgical resection.
The tight correlation between SerpinB3 and TGF-β, that requires the integrity of the RSL of SerpinB3, as documented by in vitro studies, has been also confirmed in non-tumor cirrhotic livers. The alterations of the microenvironment, characterized by the presence of chronic inflammation associated with liver fibrosis, typical features of the cirrhosis status, have been identified as a hallmark of liver carcinogenesis. In fact, more than 80% of the cases of hepatocellular carcinoma arise in livers with cirrhosis, a condition which constitute a real precancerous stage. Activated hepatic stellate cells (HSC) represent key drivers of liver fibrosis and extracellular matrix (ECM) remodeling, and a recent study has demonstrated that SerpinB3 is able to directly activate human HSC, resulting in a strong up-regulation of the expression of genes involved in fibrogenesis and angiogenesis.
In recent years there is growing evidence that the impairment of immune surveillance plays a pivotal role in liver cancer development and progression. In this context, TGF-β is a key player, suppressing proper anti-tumor immune responses, through the induction of regulatory T cells (Tregs) that have a profound ability to control immune responses[45,46] and SerpinB3 might be also involved in the immune escape mechanism by enhancing TGF-β production. Other findings through which SerpinB3 seems to promote the immune impairment are its ability to inhibit the intratumor infiltration by natural killer cells and to reduce the inflammatory response in other experimental settings.
One of the most important and yet unmet needs in clinical settings is the availability of serological markers to identify patients with cirrhosis at higher risk of HCC development. Since the incidence of hepatocellular carcinoma in individuals with cirrhosis is 3%-5% per year, the identification of the subgroup of patients with possible HCC development within the next few years would allow the development of a personalized clinical management and more effective early therapeutic interventions. On the basis of the oncogenic potential of SerpinB3, and of the reported findings of the presence of SERPINB3/4 isoforms (or SCCA) in the vast majority of HCCs specimens, in the last years ELISA assays have been developed to assess the presence of SCCA as free protein and/or bound to IgM as circulating immune complexes in serum. The occurrence of biomarker-IgM immune complexes has been described as the result of cancer immunoediting, in which natural IgMs are important players of the innate immune system preventing tumor formation. Free SCCA is barely detectable in serum of patients with advanced liver disease and primary liver cancer, while this molecule was found coupled to IgMs (SCCA-IgM) in the majority of patients with HCC, whereas in the healthy control population their levels were below the limit of detection.
The concentration of circulating SCCA-IgM has been found progressively increased at different stages of liver disease, from chronic hepatitis to cirrhosis and HCC, reflecting the extent of SCCA protein overexpression in the liver. In individual patients, the progressive increase of SCCA-IgM over time was remarkable in cirrhotic patients who developed HCC, and resulted unchanged in the majority of the cirrhotic patients without evidence of liver cancer during the same time interval. These data have been confirmed in another retrospective study, where baseline values of serological SCCA-IgM were nearly 4-fold higher in patients who developed HCC than in those without HCC progression. In addition, SCCA-IgM values ≤ 200 AU/mL accurately identified patients at low risk of liver cancer in the subsequent year, with a negative predictive value of 97%.
In agreement with these findings, the prognostic role of this biomarker was confirmed in a prospective study showing that, among patients matched for clinical stage of cirrhosis, those with baseline levels of SCCA-IgM above the cut-off (200 AU/mL) developed more frequently HCC during follow-up than those negative for the biomarker.
In a recent study that has retrospectively analyzed patients with cirrhosis and HCC, SCCA-IgM was proven efficient in the prediction of HCC prognosis, identifying HCC patients with long overall and progression-free survival. Median survival was indeed about two fold increased in patients with low levels of SCCA-IgM, compared to those with elevated SCCA-IgM levels. At multivariate analysis tumour size and SCCA-IgM levels were identified as the only independent predictors of survival. In addition, levels of this biomarker were correlated with overall response to treatment, with a median time to progression that was more than doubled in patients with low SCCA-IgM levels. The levels of the biomarker at four weeks were stable or increased in treated patients with stable disease or tumor, and were reduced in patients with complete response, while patients with partial response showed an intermediate behaviour. It is worth to note that in the same study, AFP was not able to predict complete response. Another recent study addressed the behaviour of SCCA-IgM in patients with HCC who underwent locoregional therapy. Among the enrolled patients with a new diagnosis of HCC, SCCA-IgM levels at basal time and after one month of treatment, resulted significantly lower in patients who responded to therapy compared to those who did not respond. These findings need to be confirmed in further studies, but are supported by a previous report that within the liver, HCCs with high SCCA-1 tissue expression have a poor prognosis and present higher rate of early recurrence after surgical resection.
Chronic inflammation and immune system play a crucial role in the development of dysplastic nodules and liver cancer[41,44], as the pathogenesis of HCC has been associated with hepatocyte death, infiltration of inflammatory cells, and compensatory liver regeneration, which is dependent on the production of hepatic mitogenic cytokines produced by Kuppfer cells, such as IL-6. A previous study documented a positive correlation between RAS mutation, enhanced SerpinB3 and interleukin-6 expression in samples of human colorectal and pancreatic tumors, reflecting an inflammatory response related to the nuclear factor kappa-light chain enhancer of activated B cell. Moreover, SerpinB3 was found physiologically expressed on the surface of CD27+ B lymphocytes, and it has been detected in peripheral blood mononuclear cells at transcript level both in cultured and in primary monocytes. These findings suggest that SerpinB3 might play a role in the modulation of the immune response, favouring tumor development, but further studies are needed to clearly elucidate its role in this specific field.
Drafted the article: Martini A
Revised the article and approved the version to be published: Pontisso PAvailability of data and materials
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