A Novel Epigenetic Strategy to Concurrently Block Immune Checkpoints PD-1/PD-L1 and CD155/TIGIT in Hepatocellular Carcinoma

Tumor microenvironment is an intricate web of stromal and immune cells creating an immune suppressive cordon around the tumor. In hepatocellular carcinoma (HCC), Tumor microenvironment is a formidable barrier towards novel immune therapeutic approaches recently evading the oncology field. In this study, the main aim was to identify the intricate immune evasion tactics mediated by HCC cells and to study the epigenetic modulation of the immune checkpoints; Programmed death-1 (PD-1)/ Programmed death-Ligand 1 (PD-L1) and T cell immunoreceptor with Ig and ITIM domains (TIGIT)/Cluster of Differentiation 155 (CD155) at the tumor-immune synapse. Thus, liver tissues, PBMCs and sera were collected from Hepatitis C Virus (HCV), HCC as well as healthy individuals. Screening was performed to PD-L1/PD-1 and CD155/TIGIT axes in HCC patients. PDL1, CD155, PD-1 and TIGIT were found to be significantly upregulated in liver tissues and peripheral blood mononuclear cells (PBMCs) of HCC patients. An array of long non-coding RNAs (lncRNAs) and microRNAs validated to regulate such immune checkpoints were screened. The lncRNAs; CCAT-1, H19, and MALAT-1 were all significantly upregulated in the sera, PBMCs, and tissues of HCC patients as compared to HCV patients and healthy controls. However, miR-944-5p, miR-105-5p, miR-486-5p, miR-506-5p, and miR-30a-5p were downregulated in the sera and liver tissues of HCC patients. On the tumor cell side, knocking down of lncRNAs-CCAT-1, MALAT-1, or H19-markedly repressed the co-expression of PD-L1 and CD155 and accordingly induced the cytotoxicity of co-cultured primary immune cells. On the immune side, ectopic expression of the under-expressed microRNAs; miR-486-5p, miR-506-5p, and miR-30a-5p significantly decreased the transcript levels of PD-1 in PBMCs with no effect on TIGIT. On the other hand, ectopic expression of miR-944-5p and miR-105-5p in PBMCs dramatically reduced the co-expression of PD-1 and TIGIT. Finally, all studied miRNAs enhanced the cytotoxic effects of PBMCs against Huh7 cells. However, miR-105-5p showed the highest augmentation for PBMCs cytotoxicity against HCC cells. In conclusion, this study highlights a novel co-targeting strategy using miR-105-5p mimics, MALAT-1, CCAT-1 and H19 siRNAs to efficiently hampers the immune checkpoints; PD-L1/PD-1 and CD155/TIGIT immune evasion properties in HCC.

Epithelial-Mesenchymal Transition Markers in HCVAssociated Hepatocellular Carcinoma: A Multivariate Follow Up Study

OBJECTIVE

Validated markers to predict recurrence after surgical resection of hepatocellular carcinoma (HCC) are needed. Little data is available regarding epithelial-mesenchymal transition (EMT) markers in HCC. The objective of this study was to investigate the expression of EMT markers and their correlation with clinicopathological variables and survival in hepatitis C virus (HCV)-associated HCC.

METHODS

This longitudinal study included 109 cases of HCV-associated HCC treated with surgical resection. Nine different EMT markers (vimentin, E-cadherin, N-cadherin, Stat3, Snail1, Slug, Twist1, Zeb1 and integrin α5) were evaluated on liver tissue from HCC cases. Twenty fresh HCC samples from the studied cases were used for gene expression of EMT markers by quantitative real time polymerase chain reaction (PCR).

RESULTS

EMT markers expression was 71%, 25%, 26%, 27%, 9%, 4%, 72%, 47%, 87% for vimentin, E-cadherin, N-cadherin, Stat3 snail1, slug, twist1, Zeb1 and integrin α5 respectively.  EMT mRNA in HCC tissues correlated with protein expression by 50-70%.  Vimentin was independent predictor of large tumor size (P=0.001), high risk of recurrence (HRR) (P=0.006) and shorter disease free survival (P=0.03) in multivariate analysis.  Reduced E-cadherin was a predictor of HRR (P=0.002).

CONCLUSION

Vimentin and E-cadherin were the most powerful prognostic EMT markers in HCV-associated HCC in prediction of recurrence.

Altered Protein and Gene Expression of Beclin-1 Correlates with Poor Prognosis of Hcv-Associated Hepatocellular Carcinoma in Egyptian Patients

Autophagy modulation has recently been addressed as a novel target for overcoming therapeutic resistance in hepatocellular carcinoma (HCC) to currently available anti-HCC therapy. The aim of this study was to investigate the protein and gene expression of Beclin-1 and its correlation with prognosis in HCV-associated HCC in Egyptian patients. This prospective study included 50 patients with HCV-associated-HCC, treated with surgical resection. Immunohistochemistry of antibody and quantitative real-time PCR of Beclin-1 gene were assessed in liver tissues of HCC. A normal-like expression pattern of Beclin-1 was found in 100% of adjacent liver tissues, while in HCC three various patterns were recognized: negative expression [18 (36%)], over expression [16 (32%)] and normal pattern [16 (32%)] (p=0.001). Beclin-1 mRNA in HCC tissues correlated with protein expression with correlation coefficient of 0.774 (p <0.001). Patients with negative expression of Beclin-1 had a significantly poor overall survival rates compared with patients with normal-like expression pattern (p <0.007), which was confirmed by multivariate analysis (p=0.01). Over-expression of Beclin-1 was significantly associated with vascular invasion (p <0.003). However, high tumor histological grade, focal lesion multiplicity, presence of involved margin or cirrhosis were insignificantly related to Becin-1. Beclin-1 altered expression has an important role in development and prognosis of HCC.

Health: redefined

For many years the definition of 'health' has remained unchanged as a narrow concept, encompassing physical wellbeing from a medical context. This somewhat focused definition has attracted criticism from individuals and professional bodies alike. Recent attempts have been made to redefine health, each offering an alternative viewpoint from sociological, environmental, societal and economic standpoints. We summarize and contextualize these definitions and provide an alternative, new, all-encompassing definition of health.

MiR-615-5p depresses natural killer cells cytotoxicity through repressing IGF-1R in hepatocellular carcinoma patients

miR-615-5p was characterized by our group as a tumour suppressor. IGF-1 R activates a downstream signalling pathway, well characterized in liver cells, however, its role in immunity especially Natural Killer cells (NKs) remains vague. This study aimed at investigating the regulatory role of miR-615-5p on IGF signalling and its impact on NKs cytotoxicity in HCC. Our results showed an upregulation in miR-615-5p and IGF-1 R in NKs of 130 HCC patients compared to 35 controls. Forcing the expression of miR-615-5p, repressed IGF-IR, attenuated NKs cytotoxicity, decreased CD56^dim, increased CD56^bright NK subsets and reduced the cytotoxic markers NKG2D, TNF-α and perforins. It repressed NKG2D ligand (ULBP2) in Huh-7 cells. In conclusion, miR-615-5p represses IGF-1 R in NKs and their target hepatocytes; however, it has a contradicting impact on HCC progression on both cell types. These findings might pave the way for better understanding the role of microRNAs in NKs function and HCC immune-pathogenesis.

Contradicting interplay between insulin-like growth factor-1 and miR-486-5p in primary NK cells and hepatoma cell lines with a contemporary inhibitory impact on HCC tumor progression

In this study, an impaired natural killer (NK) cell cytolytic activity in 135 hepatocellular carcinoma (HCC) patients parallel to a reduced expression level of insulin-like growth factor (IGF)-1 in NK cells of HCC patients has been revealed. Ectopic expression of miR-486-5p, a direct upstream regulator of IGF-1, restored the endogenous level of IGF-1 in NK cells of HCC patients, thus augmenting its cytolytic activity against Huh7 cells in an opposite manner to the IGF-1 siRNAs. Unorthodoxly, over-expression of miR-486-5p in target hepatocytes resulted in the repression of IGF-1, suppression of Huh7 cells proliferation and viability in a similar pattern to the IGF-1 siRNAs. Therefore, this study highlights a potential role of IGF-1 in modulating cytolytic potential of NK cells of HCC patients. miR-486-5p acts in a cell-specific manner, differentially modulating IGF-1 expression in NK cells and their target hepatocytes with a contemporary inhibitory impact on HCC progression.

Comparing staging systems for predicting prognosis and survival in patients with hepatocellular carcinoma in Egypt

Introduction

Several hepatocellular carcinoma (HCC) staging systems are available. Although the European Association for Study of Liver Diseases (EASL) and American Association for the Study of Liver Diseases (AASLD) recommended the use of Barcelona Clinic Liver Cancer (BCLC), many studies in different populations revealed heterogeneous results. The aim of this study was to compare different staging systems for predicting prognosis and survival, and for stratifying HCC patients for treatment at a national referral centre for liver disease in Egypt.

Methods

2000 Patients were included in this study. Baseline demographic, clinical, laboratory, and radiological data were determined at diagnosis. Patients were stratified using the Okuda, BCLC, Cancer of the Liver Italian Program (CLIP), and Japan Integrated Staging (JIS). Patients’ survival in different stages within each staging system and the validity of the system in predicting survival were compared.

Results

The overall survival was 15 months. The 1-, 2-, 3- and 4-year survival of the entire cohort was 56%, 34%, 25% and 15% respectively. The presence of ascites, multiple focal lesions, large tumour size >5 cm, portal vein thrombosis, extra-hepatic spread, AFP≥200 ng/ml and poor Child score were independent predictors of survival (p<0.001). All staging systems were significant in determining overall survival in univariate and multivariate analyses. BCLC was the most predictive staging system for the whole cohort (p<0.001). Among the subgroup of patients offered potentially curative therapy, BCLC was the most informative system in predicting patient survival (p<0.001). For patients with advanced HCC not amenable for specific therapy, CLIP was the best staging system for predicting prognosis (p<0.001).

Conclusion

BCLC staging system provided the best prognostic stratification for HCC patients. However, CLIP score has the highest stratification ability in patients with advanced HCC highlighting the importance of including AFP in best staging system.

Hepatocellular carcinoma: Epidemiology, risk factors and pathogenesis

Hepatocellular carcinoma (HCC) is the commonest primary malignant cancer of the liver in the world. Given that the burden of chronic liver disease is expected to rise owing to increasing rates of alcoholism, hepatitis B and C prevalence and obesity-related fatty liver disease, it is expected that the incidence of HCC will also increase in the foreseeable future. This article summarizes the international epidemiology, the risk factors and the pathogenesis of HCC, including the roles of viral hepatitis, toxins, such as alcohol and aflatoxin, and insulin resistance.

Control of deaths from diarrheal disease in rural communities. I. Design of an intervention study and effects on child mortality

From May through October 1980, the "Strengthening Rural Health Delivery" project (SRHD) under the Rural Health Department of the Ministry of Health of Egypt had conducted an investigation into prevention of child mortality from diarrheal disease through testing various modules of Oral Rehydration Therapy delivery mechanisms. In a six-cell design counting a total of almost 29,000 children, ORT was provided both as hypotonic sucrose/salt solution prepared and administered by mothers and normotonic, balanced electrolyte solution in the hands of both mothers and health care providers and the effects on child mortality during the peak season of diarrheal incidence were measured. In addition, utilization and effects of ORT when made readily available through commercial channels was similarly examined. A cost-benefit analysis was performed on the cost of the services as well as on the outcome for each of five study cells using the sixth, the control, as reference. Results showed that early rehydration with a sucrose/salt solution in the hands of mothers, backed by balanced oral rehydration solution in the hands of health care providers proved the most cost-effective means of reducing diarrhea-specific mortality as well as being as safe as prepackaged commercial preparations.