Dual strategy involving hospital-based study and community-based screening to eliminate hepatitis C in remote areas.

BACKGROUND: /Purpose: To achieve the World Health Organization goal of eliminating viral hepatitis by 2030, a key strategy in resource-limited areas is to identify the areas with high prevalence and to prioritize screening and treatment intervention. We hypothesized that a hospital-based laboratory database could be used to estimate the township- and village-specific anti-hepatitis C virus (HCV) prevalence. METHODS: Yunlin County Public Health Bureau has been collecting anti-HCV test data from eight major hospitals. Township- and village-specific screening testing rates and anti-HCV prevalence were calculated for residents 40 years or older. A township with a wide range of anti-HCV prevalence rates was selected for outreach universal screening and for validating the village-specific prevalence of anti-HCV in the analysis of the data from the hospitals. RESULTS: The overall anti-HCV screening testing rate in Yunlin County was 30.4 %, whereas the anti-HCV prevalence rate for persons 40 years or older was 15.4 %. The village-specific anti-HCV prevalence rates ranged from 3.8 % to 85.8 %. Community-based screening was conducted in Kouhu Township. The village-specific anti-HCV prevalence rates ranged from 0 % to 18.8 %. Three of the four villages had the highest village-specific anti-HCV prevalence in the community-based study and the hospital-based study. Additionally, 95.8 % of the new HCV cases detected by universal screening received anti-HCV therapy. CONCLUSION: The hospital-based database provided a framework for identifying the villages with high anti-HCV prevalence. Additionally, community-based universal screening should be prioritized for villages with high prevalence in hospital-based databases.

Ledipasvir/sofosbuvir for HCV genotype 1, 2, 4-6 infection: Real-world evidence from a nationwide registry in Taiwan.

BACKGROUND/PURPOSE: The Taiwan Association for the Study of the Liver (TASL) HCV Registry (TACR) is a nationwide registry of chronic hepatitis C patients in Taiwan. This study evaluated antiviral effectiveness of ledipasvir (LDV)/sofosbuvir (SOF) in patients in the TACR. METHODS: Patients enrolled in TACR from 2017-2020 treated with LDV/SOF were eligible. The primary outcome was the proportion of patients with sustained virologic response 12 weeks after end of treatment (SVR12). RESULTS: 5644 LDV/SOF ± ribavirin-treated patients were included (mean age: 61.4 years; 54.4% female). Dominant viral genotypes were GT1 (50.8%) and GT2 (39.3%). 1529 (27.1%) patients had liver cirrhosis, including 201 (3.6%) with liver decompensation; 686 (12.2%) had chronic kidney disease. SVR12 was achieved in 98.6% of the overall population and in 98.2% and 98.7% of patients with and without cirrhosis, respectively. SVR12 rates in patients with compensated cirrhosis treated with LDV/SOF without RBV were >98%, regardless of prior treatment experience. SVR12 was 98.6%, 98.4%, 100%, 100%, and 98.7% among those with GT1, GT2, GT4, GT5, and GT6 infections, respectively. Although patient numbers were relatively small, SVR12 rates of 100% were reported in patients infected with HCV GT2, GT5, and GT6 with decompensated cirrhosis and 98% in patients with severely compromised renal function. LDV/SOF adherence ≤60% (P < 0.001) was the most important factor associated with treatment failure. Incidence of adverse events was 15.8%, with fatigue being the most common. CONCLUSION: LDV/SOF is effective and well tolerated in routine clinical practice in Taiwan. Cure rates were high across patient populations.

Enzymatic Synthesis of Novel and Highly Soluble Puerarin Glucoside by Deinococcus geothermalis Amylosucrase.

Puerarin (daidzein-8-C-glucoside) is an isoflavone isolated from several leguminous plants of the genus Pueraria. Puerarin possesses several pharmacological properties; however, the poor solubility of puerarin limits its applications. To resolve this poor solubility, Deinococcus geothermalis amylosucrase (DgAS) was used to modify puerarin into more soluble derivatives. The results showed that DgAS could biotransform puerarin into a novel compound: puerarin-4'-O-α-glucoside. The biotransformation reaction was manipulated at different temperatures, pH values, sucrose concentrations, reaction times, and enzyme concentrations. The results showed that the optimal reaction condition was biotransformed by 200 µg/mL DgAS with 20% (w/v) sucrose at pH 6 and incubated at 40 °C for 48 h, and the optimal production yield was 35.1%. Puerarin-4'-O-α-glucoside showed 129-fold higher solubility than that of puerarin and, thus, could be further applied for pharmacological use in the future.

Sofosbuvir/velpatasvir is an effective treatment for patients with hepatitis C and advanced fibrosis or cirrhosis in a real-world setting in Taiwan.

INTRODUCTION: Real-world data regarding the impact of hepatic fibrosis on the effectiveness of sofosbuvir/velpatasvir (SOF/VEL) treatment is limited in the Asian population. METHODS: We analyzed data for all 823 patients with hepatitis C virus treated with SOF/VEL from June 2019 to September 2020 at Chang Gung Memorial Hospital in Chiayi, Taiwan. The degree of fibrosis was determined using the fibrosis-4 (FIB-4) index, with advanced fibrosis or cirrhosis defined as a FIB-4 score of > 3.25. The primary treatment outcome was the rate of sustained virologic response 12 weeks after treatment cessation (SVR). Adverse events (AEs) were also evaluated. RESULTS: SVR rates did not significantly differ (p > 0.05) between patients with FIB-4 scores of ≤ 3.25 and those with scores of > 3.25. In the per protocol analysis, 99.2% (593/598) of the FIB-4 ≤ 3.25 group and 100% (172/172) of the FIB-4 > 3.25 group achieved SVR; in the evaluable population analysis, 93.4% (593/635) of the FIB-4 ≤ 3.25 group and 91.5% (172/188) of the FIB-4 > 3.25 group achieved SVR. Five patients with FIB-4 scores of ≤ 3.25 did not attain SVR: two relapsed and three had no response. The most common AEs were comparable (p > 0.05) for the FIB-4 ≤ 3.25 group and the FIB-4 > 3.25 group and included abdominal discomfort (4.4% vs. 5.9%), fatigue (4.1% vs. 5.9%), and skin itching (3.6% vs. 3.2%). Laboratory abnormalities were more common in the FIB-4 > 3.25 group (p < 0.001). Six patients with FIB-4 scores of > 3.25 had total bilirubin elevation > 3 × the upper normal limit (UNL). Alanine transaminase elevation > 5 × the UNL was observed in two patients with FIB-4 scores of ≤ 3.25 and one patient with a FIB-4 score of > 3.25. No AEs resulted in treatment discontinuation. CONCLUSIONS: SOF/VEL treatment is well tolerated and achieves high SVR rates for patients of Taiwanese ethnicity with HCV, regardless of cirrhosis status.

Pangenotypic direct-acting antiviral agents for mixed genotype hepatitis C infection: A real-world effectiveness analysis.

BACKGROUND: Pangenotypic direct-acting antiviral agents (DAAs) glecaprevir/pibrentasvir (GLE/PIB) and sofosbuvir/velpatasvir (SOF/VEL) are effective against all hepatitis C virus (HCV) genotype infections. However, data on pangenotypic DAA treatment for mixed genotype HCV infection are sparse. METHODS: This is a retrospective, single site cohort study analyzing all patients with mixed HCV genotype infections treated with GLE/PIB or SOF/VEL from August 2018 to August 2020 in Chiayi Chang Gung Memorial Hospital, Taiwan. The primary study endpoint was sustained virologic response (SVR) 12 weeks after treatment cessation. We also reported adverse events (AEs). RESULTS: A total of 108 patients with mixed infections of any two or three genotypes of 1a, 1b, 2, 3, and 6 received pangenotypic DAAs during the study period. A total of 67 patients received GLE/PIB and 41 received SOF/VEL. The evaluable population analysis revealed SVR rates of 94% (63/67) and 95.1% (39/41) for GLE/PIB and SOF/VEL therapy, respectively, and the per-protocol analysis revealed an SVR of 100% for both regimens. Four patients in the GLE/PIB group and two patients in the SOF/VEL were lost to follow-up. The most common AEs for GLE/PIB versus SOF/VEL therapy included pruritus (14.9% vs 2.4%), fatigue (6.0% vs 7.3%), abdominal discomfort (4.5% vs 7.3%), and acid reflux (3.0% vs 4.9%). DAA-related significant laboratory abnormalities occurred in three patients with > 1.5 × elevated bilirubin level in the GLE/PIB group. None of the above AEs resulted in DAA discontinuation. CONCLUSIONS: Pangenotypic DAAs are well tolerated by and yield high SVR rates in patients with mixed genotype HCV infection.

Production of a new triterpenoid disaccharide saponin from sequential glycosylation of ganoderic acid A by 2 Bacillus glycosyltransferases.

Ganoderic acid A (GAA) is a lanostane-type triterpenoid, isolated from medicinal fungus Ganoderma lucidum, and possesses multiple bioactivities. In the present study, GAA was sequentially biotransformed by 2 recently discovered Bacillus glycosyltransferases (GT), BtGT_16345 and BsGT110, and the final product was purified and identified as a new compound, GAA-15,26-O-ß-diglucoside, which showed 1024-fold aqueous solubility than GAA.

Usefulness of quantitative hepatitis B surface antigen testing in hepatitis B community-based screening.

BACKGROUND/PURPOSE: Low viral load (LVL) of hepatitis B virus (HBV) is a predictor of chronic HBV infection. However, the usefulness of quantitative hepatitis B surface antigen (qHBsAg) in predicting LVL in community-based screening has not been well studied. We aimed to measure the prevalence of LVL in HBV carriers and validate the efficacy of qHBsAg in predicting LVL. METHODS: This community-based screening study was conducted in Taiwan. HBV DNA was assayed in HBsAg carriers. Participants were randomized to training and validation sets to determine the ability of qHBsAg to predict LVL. Receiver operating characteristic curves were used to identify the best cutoff values in the training set. RESULTS: Among the 2919 participants, 359 (12.2%) were HBsAg carriers. There were 132 and 137 carriers in the training and validation sets, respectively. Significant correlations were found between qHBsAg and HBV DNA in both training and validation sets. Thirty and 29 participants with qHBsAg <8 IU/mL in the training and validation sets, respectively, had LVL. Using 8 IU/mL as the cutoff, negative predictive value (NPV) of qHBsAg for HBV DNA levels >2000 IU/mL was 100%. The best cutoff level of qHBsAg to predict HBV LVL was 200 IU/mL, with a sensitivity, specificity, and accuracy of 75.0%, 76.1%, and 75.8%, respectively, in the training set. The positive predictive value and NPV were 70.0% and 77.9%, respectively, in the validation set. CONCLUSION: Approximately 60% of HBsAg carriers had HBV LVL, and qHBsAg <8 IU/mL accurately predicts LVL. This quantitative test provides additional information for community-based screening.

Immuno-Metabolism: The Role of Cancer Niche in Immune Checkpoint Inhibitor Resistance.

The use of immune checkpoint inhibitors (ICI) in treating cancer has revolutionized the approach to eradicate cancer cells by reactivating immune responses. However, only a subset of patients benefits from this treatment; the majority remains unresponsive or develops resistance to ICI therapy. Increasing evidence suggests that metabolic machinery in the tumor microenvironment (TME) plays a role in the development of ICI resistance. Within the TME, nutrients and oxygen are scarce, forcing immune cells to undergo metabolic reprogramming to adapt to harsh conditions. Cancer-induced metabolic deregulation in immune cells can attenuate their anti-cancer properties, but can also increase their immunosuppressive properties. Therefore, targeting metabolic pathways of immune cells in the TME may strengthen the efficacy of ICIs and prevent ICI resistance. In this review, we discuss the interactions of immune cells and metabolic alterations in the TME. We also discuss current therapies targeting cellular metabolism in combination with ICIs for the treatment of cancer, and provide possible mechanisms behind the cellular metabolic rewiring that may improve clinical outcomes.

Glycosylation of Ganoderic Acid G by Bacillus Glycosyltransferases.

Ganoderma lucidum is a medicinal fungus abundant in triterpenoids, its primary bioactive components. Although numerous Ganoderma triterpenoids have already been identified, rare Ganoderma triterpenoid saponins were recently discovered. To create novel Ganoderma saponins, ganoderic acid G (GAG) was selected for biotransformation using four Bacillus glycosyltransferases (GTs) including BtGT_16345 from the Bacillus thuringiensis GA A07 strain and three GTs (BsGT110, BsUGT398, and BsUGT489) from the Bacillus subtilis ATCC 6633 strain. The results showed that BsUGT489 catalyzed the glycosylation of GAG to GAG-3-o-ß-glucoside, while BsGT110 catalyzed the glycosylation of GAG to GAG-26-o-ß-glucoside, which showed 54-fold and 97-fold greater aqueous solubility than that of GAG, respectively. To our knowledge, these two GAG saponins are new compounds. The glycosylation specificity of the four Bacillus GTs highlights the possibility of novel Ganoderma triterpenoid saponin production in the future.

The Role of IGF/IGF-1R Signaling in Hepatocellular Carcinomas: Stemness-Related Properties and Drug Resistance.

Insulin-like Growth Factor (IGF)/IGF-1 Receptor (IGF-1R) signaling is known to regulate stem cell pluripotency and differentiation to trigger cell proliferation, organ development, and tissue regeneration during embryonic development. Unbalanced IGF/IGF-1R signaling can promote cancer cell proliferation and activate cancer reprogramming in tumor tissues, especially in the liver. Hepatocellular carcinoma (HCC) is one of the leading causes of cancer-related death, with a high incidence and mortality rate in Asia. Most patients with advanced HCC develop tyrosine kinase inhibitor (TKI)-refractoriness after receiving TKI treatment. Dysregulation of IGF/IGF-1R signaling in HCC may activate expression of cancer stemness that leads to TKI refractoriness and tumor recurrence. In this review, we summarize the evidence for dysregulated IGF/IGF-1R signaling especially in hepatitis B virus (HBV)-associated HCC. The regulation of cancer stemness expression and drug resistance will be highlighted. Current clinical treatments and potential therapies targeting IGF/IGF-1R signaling for the treatment of HCC will be discussed.

Enzymatic Synthesis of Novel Vitexin Glucosides.

Vitexin is a C-glucoside flavone that exhibits a wide range of pharmaceutical activities. However, the poor solubility of vitexin limits its applications. To resolve this limitation, two glycoside hydrolases (GHs) and four glycosyltransferases (GTs) were assayed for glycosylation activity toward vitexin. The results showed that BtGT_16345 from the Bacillus thuringiensis GA A07 strain possessed the highest glycosylation activity, catalyzing the conversion of vitexin into new compounds, vitexin-4'-O-ß-glucoside (1) and vitexin-5-O-ß-glucoside (2), which showed greater aqueous solubility than vitexin. To our knowledge, this is the first report of vitexin glycosylation. Based on the multiple bioactivities of vitexin, the two highly soluble vitexin derivatives might have high potential for pharmacological usage in the future.

Real-world effectiveness of glecaprevir/pibrentasvir and ledipasvir/sofosbuvir for mixed genotype hepatitis C infection: A multicenter pooled analysis in Taiwan.

Data on direct-acting antiviral agent (DAA) treatment for mixed genotype hepatitis C virus (HCV) infection are scant. This study examined the effectiveness of glecaprevir/pibrentasvir (GLE/PIB) and ledipasvir/sofosbuvir (LDV/SOF) for mixed HCV genotype infection in a real-world setting in Taiwan. We analysed the data from all patients with mixed HCV genotype infections treated with GLE/PIB or LDV/SOF from 2017 to 2019 in three Chang Gung Memorial Hospitals in Taiwan. The primary treatment outcome was sustained virologic response 12 weeks after treatment cessation (SVR12). Adverse events (AEs) were also evaluated. A total of 5190 HCV patients received DAA treatment during this time period. Among them, 116 patients (2.2%) had mixed infections of any 2 or 3 genotypes of 1a, 1b, 2, 3 and 6. Fifty-four patients received GLE/PIB and 62 received LDV/SOF. SVR12 rates for LDV/SOF vs GLE/PIB therapy were 96.6% (56/58) vs 100% (51/51) by the per-protocol analysis and 90.3% (56/62) vs 94.4% (51/54) by the evaluable population analysis. Two patients with 1b + 6 and 1b + 2 genotype infections in the LDV/SOF group had relapse. Evaluating the GLE/PIB vs LDV/SOF groups for the most common AEs revealed pruritus (16.7% vs 4.8%), abdominal discomfort (5.6% vs 8%) and fatigue (5.6% vs 4.8%). One patient with AE-related treatment discontinuation presented with liver decompensation after 4-week GLE/PIB therapy. DAA-related significant laboratory abnormalities occurred in two patients with >3× elevated bilirubin level in the GLE/PIB group. GLE/PIB and LDV/SOF are well tolerated and achieve high SVR12 rates for patients with mixed HCV genotype infection.

Challenges of transferring rural adults with chronic HCV infection for further HCV RNA confirmation and free DAAs treatment: a success story of the interdisciplinary collaboration approach.

BACKGROUND: Chronic hepatitis C virus (HCV), which is a concern in many countries, is the leading cause of liver cancer around the world. Since Taiwan launched its national health insurance system in 1995, it has managed to extend health coverage to 99% of the Taiwanese population, providing free but limited antiviral treatment each year since 2017. However, many people in rural areas are unaware that they have chronic HCV; nor do they realize that new drugs with high cure rates could drastically reduce their health burden. The aim of this study is to explore the implementation facilitators of and barriers to inviting potentially infected patients in rural areas to be transferred for HCV ribonucleic acid (RNA) confirmation and new drug treatment. METHODS: A descriptive and prospective study design with an interdisciplinary collaboration approach was implemented. After five elements of referral were developed, telephone counseling was conducted between August 2018 and May 2019 in Yunlin, Taiwan. The elements of referral developed by the research team were: (1) forming and coordinating physicians' schedules, (2) recruiting and training volunteers, (3) training the nursing staff, (4) raising funds or resources, and (5) connecting with village leaders. Thereafter, we collaborated with two district health centers, a private local hospital, and health clinics. Based on the medical records provided by these agencies, community adults that were HCV antibody (anti-HCV) positive were invited to join the program. RESULTS: Of the 1795 adults who were serum anti-HCV positive, 1149 (64%) accepted transfer to a qualified hospital; of these, 623 (54.2%) had an HCV infection. 552 (88.6%) of those infected started receiving direct-acting antivirals (DAAs) treatment. The top four barriers to accepting transfer were: (1) they perceived themselves to be healthy (n = 98, 32.3%); (2) mistrust of treatment/healthcare (n = 60, 20.2%); (3) limited transportation to the hospital (n = 52, 17.5%); and (4) work conflict (n = 30, 10.1%). CONCLUSION: An interdisciplinary collaboration approach significantly contributed to the invitation of CHC patients, as well as their acceptance of HCV RNA confirmation and free DAAs treatment. Using anti-HCV data from previous medical records for case-finding and collaborating with a hospital and health clinics proved to be an efficient strategy.

Liver Health Literacy and Health Status Among Adults With Hepatitis C: Implications for the Nursing Profession as Part of the 2030 Global Elimination Goal.

PURPOSE: To explore the prevalence of hepatitis C virus (HCV) infection as well as the levels of liver health literacy and association with the health status of people with HCV through the nurse-led community health development goal of global elimination. METHODS: A community-based, cross-sectional study was conducted between July 2018 and June 2019 in coastal Western Yunlin County, Taiwan. This study was conducted at five townships, and serum HCV antibody (anti-HCV) screening was used for the identification of potentially infected people by a collaborating local hospital. RESULTS: Of the 1,963 adults from rural areas enrolled in this study, 321 (16.4%) were anti-HCV positive, 237 (73.8%) reported that they were unaware of their HCV positivity, and none of them were provided information on direct-acting antiviral agent therapy. The levels of anti-HCV positivity were higher among female patients (p < .05), elderly people (p < .001), those with a low education level (p < .001), and those from the Sihu Township within Yunlin County (p < .001). Participants with anti-HCV positivity tended to have lower intakes of vegetables (p < .01) and fruit (p < .05), a greater number of comorbidities (p < .05), as well as a greater incidence of abnormal liver (p < .001) and renal function (p < .001) compared to those with anti-HCV negativity. Multivariable linear regression analysis showed that the presence of HCV infection and a greater number of metabolic syndrome components were associated with poor liver and renal function. CONCLUSIONS: These findings showed a high prevalence of HCV infection among adults living in rural areas, who had low literacy levels on hepatitis, unhealthy lifestyles, and abnormal liver and renal function. CLINICAL RELEVANCE: Clinicians and primary healthcare providers should initiate efforts to increase the levels of liver health literacy by increasing the accessibility to infection confirmation tests and reducing the number of barriers to the reception of antiviral treatment.

High viral load predicts virologic failure in chronic genotype 2 hepatitis C virus-infected patients receiving glecaprevir/pibrentasvir therapy.

BACKGROUND: The real-world data of glecaprevir/pibrentasvir (GLE/PIB) therapy for patients with chronic hepatitis C virus (HCV) genotype 2 infection remained limited. We aimed to evaluate the possible predictors of virological failure and side effects of GLE/PIB therapy for chronic genotype 2 HCV-infected patients in a real-world setting. METHODS: A total of 326 compensated HCV genotype 2 patients treated with GLE/PIB 12 weeks for cirrhotic patients (n = 56) and 8 weeks for non-cirrhotic patients (n = 270) were enrolled. RESULTS: The sustained virological response 12 weeks off therapy (SVR12) was 98.1%, 100%, and 97.7% in overall, GLE/PIB 12-week, and 8-week group, respectively. There were 6 (1.8%) patients with early withdrawal, and 14.1% patients had pruritus, the major adverse effect. In multivariate analyses, end-stage renal disease (odds ratio (OR) = 4.056, 95% confidence interval (CI) = 1.477-11.14, p = 0.007) and hypertension (OR = 2.325, 95% CI = 1.171-4.616, p = 0.016) were two significant factors associated with pruritus. There were 6 patients with virologic failure. In patients receiving 8-week GLE/PIB therapy, the SVR12 rate was significant lower in high baseline viral load (≥107 IU/ml) group compared to low viral load group (90.6% v.s 98.7%, p = 0.025). Multivariate analyses showed that HCV RNA≥107 IU/ml was one of the independent factors (OR = 0.134, 95% CI = 0.024-0.748; p = 0.022) associated with SVR12. CONCLUSION: GIE/PIB is an effective, tolerable and safe agent to treat genotype 2 HCV infected patients. However, high viral load (≥107 IU/ml) may predict virologic failure in non-cirrhotic patients receiving 8 weeks GIE/PIB treatment. This result should be further validated in a large cohort in the future.

Incidence, risk factors and impact on virological response of anemia in chronic genotype 2 hepatitis C receiving sofosbuvir plus ribavirin.

BACKGROUND/PURPOSE: The major dose-limiting toxicity of ribavirin is hemolytic anemia. We investigated the incidence, risk factors and impact on virological response of anemia in chronic hepatitis C genotype 2 patients receiving sofosbuvir plus ribavirin therapy. METHODS: This was a retrospective real-world analysis of a single center including 293 chronic hepatitis C genotype 2 patients treated with sofosbuvir plus ribavirin for 12 weeks. Severe anemia was defined as hemoglobin concentration <10 g/dl. RESULTS: Treatment was completed in 285 (97%) of patients, of whom one withdrew due to severe anemia. Ribavirin dose reduction was required in 88 (30%) of patients. After excluding those with baseline hemoglobin <10 g/dl, 79 (29%) patients had developed severe anemia during therapy. Stepwise logistic regression analysis identified that chronic kidney disease (odds ratio [OR] = 3.970, p < 0.001), baseline hemoglobin level (OR = 0.475, p < 0.001) and baseline platelet count (OR = 0.992, p = 0.022) were independent factors. The sustained viral response 12 weeks off therapy (SVR12) rate was 93.9% in the per-protocol population. Multivariate analyses showed that history of hepatocellular carcinoma significantly reduced the efficacy of sofosbuvir plus ribavirin therapy (OR = 0.172, p = 0.001). Severe anemia, dose reduction or average dose (mg/kg/day) of ribavirin was not associated with SVR12. CONCLUSION: Severe anemia was not uncommon during sofosbuvir plus ribavirin therapy for chronic hepatitis C genotype 2 patients. Careful monitoring of anemia is necessary in patients with chronic kidney disease and low baseline hemoglobin level and platelet count.

2,4-Diamino-Quinazoline, a Wnt Signaling Inhibitor, Suppresses Gastric Cancer Progression and Metastasis.

Gastric cancer (GC) is among the most treatment-refractory epithelial malignancies. Aberrant activation of Wnt/ß-catenin-signaling has been implicated in a variety of human cancers, including gastric cancer. Here we report that the elevated expression of lymphoid enhancer binding factor 1 (Lef1) is associated with the TNM (tumor- node-metastasis) stage of gastric cancer. Subsequently, 2,4-diamino-quinazoline (2,4-DAQ), a selective inhibitor of Lef1, was identified to suppress the expression of Wnt/ß-catenin target genes such as AXIN2, MYC and LGR5 and result in the suppression of gastric cancer cell growth through the apoptotic pathway. The 2,4-DAQ also exhibited an inhibitory effect on the migration/invasion of gastric cancer cells. Importantly, the treatment of human gastric tumor xenograft with 2,4-DAQ suppressed tumor growth in a nude mouse model. Furthermore, 2,4-DAQ appears effective on patient-derived organoids (PDOs). Transcriptome sequencing analysis also revealed that 2,4-DAQ are more effective on the gastric cancers that exhibit higher expression levels of Wnt-signaling pathway-related genes than their adjacent normal gastric tissues.

Effects of oral hygiene programme and home phone counselling for hepatitis C patients receiving antiviral treatment.

AIMS: To explore the effectiveness of an oral hygiene programme combined with home phone counselling on hepatitis C patients during antiviral treatment. BACKGROUND: Hepatitis C virus infection is the leading cause of liver diseases. Evidence indicates that the antiviral treatment for hepatitis C virus infection has been successful, albeit its many side effects, such as discomfort symptoms of oral ulcers, which, in turn, leads to discontinued treatment. Inappropriate oral hygiene may worsen the side effects and increase the risk of dropping out of the treatment. DESIGN: A quasi-experimental pre-post-test design was used. METHODS: The oral hygiene programme was based on a standardized protocol of oral health care combined with home phone counselling. The participants were recruited from an outpatient clinic between August 2016 and July 2017. The generalized estimating equation was used for repeated measures of oral health behaviour, oral health status and discomfort symptoms. FINDINGS: Thirty-four participants completed this study. The findings indicated that the oral hygiene programme significantly improved tooth brushing, use of dental floss and oral comfort. The result showed that the participants' oral health status significantly improved in 3 months. CONCLUSIONS: This pilot study supports the finding that an oral hygiene programme can reduce oral discomfort, improve oral hygiene behaviour, and enhance the oral health status of hepatitis C patients receiving treatment. This is a simple and low-cost programme, which can be performed at home easily and boosts the completion of antiviral treatment.

A Genome-Centric Approach Reveals a Novel Glycosyltransferase from the GA A07 Strain of Bacillus thuringiensis Responsible for Catalyzing 15-O-Glycosylation of Ganoderic Acid A.

Strain GA A07 was identified as an intestinal Bacillus bacterium of zebrafish, which has high efficiency to biotransform the triterpenoid, ganoderic acid A (GAA), into GAA-15-O-ß-glucoside. To date, only two known enzymes (BsUGT398 and BsUGT489) of Bacillus subtilis ATCC 6633 strain can biotransform GAA. It is thus worthwhile to identify the responsible genes of strain GA A07 by whole genome sequencing. A complete genome of strain GA A07 was successfully assembled. A phylogenomic analysis revealed the species of the GA A07 strain to be Bacillus thuringiensis. Forty glycosyltransferase (GT) family genes were identified from the complete genome, among which three genes (FQZ25_16345, FQZ25_19840, and FQZ25_19010) were closely related to BsUGT398 and BsUGT489. Two of the three candidate genes, FQZ25_16345 and FQZ25_19010, were successfully cloned and expressed in a soluble form in Escherichia coli, and the corresponding proteins, BtGT_16345 and BtGT_19010, were purified for a biotransformation activity assay. An ultra-performance liquid chromatographic analysis further confirmed that only the purified BtGT_16345 had the key biotransformation activity of catalyzing GAA into GAA-15-O-ß-glucoside. The suitable conditions for this enzyme activity were pH 7.5, 10 mM of magnesium ions, and 30 °C. In addition, BtGT_16345 showed glycosylation activity toward seven flavonoids (apigenein, quercetein, naringenein, resveratrol, genistein, daidzein, and 8-hydroxydaidzein) and two triterpenoids (GAA and antcin K). A kinetic study showed that the catalytic efficiency (kcat/KM) of BtGT_16345 was not significantly different compared with either BsUGT398 or BsUGT489. In short, this study identified BtGT_16345 from B. thuringiensis GA A07 is the catalytic enzyme responsible for the 15-O-glycosylation of GAA and it was also regioselective toward triterpenoid substrates.

A New Triterpenoid Glucoside from a Novel Acidic Glycosylation of Ganoderic Acid A via Recombinant Glycosyltransferase of Bacillus subtilis.

Ganoderic acid A (GAA) is a bioactive triterpenoid isolated from the medicinal fungus Ganoderma lucidum. Our previous study showed that the Bacillus subtilis ATCC (American type culture collection) 6633 strain could biotransform GAA into compound (1), GAA-15-O-ß-glucoside, and compound (2). Even though we identified two glycosyltransferases (GT) to catalyze the synthesis of GAA-15-O-ß-glucoside, the chemical structure of compound (2) and its corresponding enzyme remain elusive. In the present study, we identified BsGT110, a GT from the same B. subtilis strain, for the biotransformation of GAA into compound (2) through acidic glycosylation. BsGT110 showed an optimal glycosylation activity toward GAA at pH 6 but lost most of its activity at pH 8. Through a scaled-up production, compound (2) was successfully isolated using preparative high-performance liquid chromatography and identified to be a new triterpenoid glucoside (GAA-26-O-ß-glucoside) by mass and nuclear magnetic resonance spectroscopy. The results of kinetic experiments showed that the turnover number (kcat) of BsGT110 toward GAA at pH 6 (kcat = 11.2 min-1) was 3-fold higher than that at pH 7 (kcat = 3.8 min-1), indicating that the glycosylation activity of BsGT110 toward GAA was more active at acidic pH 6. In short, we determined that BsGT110 is a unique GT that plays a role in the glycosylation of triterpenoid at the C-26 position under acidic conditions, but loses most of this activity under alkaline ones, suggesting that acidic solutions may enhance the catalytic activity of this and similar types of GTs toward triterpenoids.