MyMedR

Displaying publications 1 - 20 of 39 in total

Abstract:

Sort:

Effects of work participation, intergenerational transfers and savings on life satisfaction of older Malaysians

Ng ST, Hamid TA

Australas J Ageing, 2013 Dec;32(4):217-21.
PMID: 24373040 DOI: 10.1111/j.1741-6612.2012.00619.x

AIM: To examine the effects of work participation, intergenerational transfers and savings on the life satisfaction of older community-dwelling Malaysians.
METHOD: Data from the 1999 Survey on Perceptions of Needs and Problems of the Elderly on people aged 60 and over were used. The life satisfaction score was constructed from 10 questions adopted from the Life Satisfaction Inventory-A by Neugarten, Havighurst and Tobin. Multiple regression analysis was used to estimate the expected level of life satisfaction.
RESULTS: Controlling for other variables in the model, respondents who provided assistance to and received assistance from children with savings had significantly higher life satisfaction than their counterparts, while work participation did not have any significant effect on life satisfaction.
CONCLUSION: Intergenerational transfers and savings are important predictors of life satisfaction. The interdependence between generations should remain and savings habits need to be cultivated to ensure a higher life satisfaction in old age.
KEYWORDS: intergenerational transfers; life satisfaction; older people; savings; work participation
Proximate determinants of fertility in peninsular Malaysia

Tey NP, Ng ST, Yew SY

Asia Pac J Public Health, 2012 May;24(3):495-505.
PMID: 21490114 DOI: 10.1177/1010539511401374

The continuing decline in fertility despite a contraction in contraceptive use in Peninsular Malaysia since the mid-1980s has triggered considerable interest in the reasons behind this phenomenon, such as increase in abortion, sterility, and out-of-wedlock pregnancy. Fertility decline has been attributed to rapid socioeconomic development, which can only influence fertility through the intermediate variables. Application of vital statistics, population census, and survey data of Peninsular Malaysia on Bongaarts's model vindicates that marriage postponement and contraceptive use are the 2 most important proximate determinants of fertility, but the effects are not uniform across the ethnic groups. For instance, the predicted total fertility rate for Chinese and Malays are 2.9 and 1.6, respectively, compared with the observed level of 3.0 and 1.9. Postpartum infecundability and abortion also play a part in explaining ethnic fertility differentials. The fertility inhibiting effects of these proximate determinants have significant implications on reproductive health and future population growth.
Perceived health status and daily activity participation of older Malaysians

Ng ST, Tengku-Aizan H, Tey NP

Asia Pac J Public Health, 2011 Jul;23(4):470-84.
PMID: 20685663 DOI: 10.1177/1010539510374751

This article investigates the influence of perceived health status on the daily activity participation of older Malaysians. Data from the Survey on Perceptions of Needs and Problems of the Elderly, which was conducted in 1999, were used. The negative binomial regression results show that older persons with good perceived health status reported more varieties of daily activity participation, especially among the uneducated and those with below-average self-esteem. The multinomial logistic regression model suggests that older persons with good perceived health status tended to engage daily in paid work only or with leisure activities, whereas those perceived to have poor health were more likely to engage in leisure activities only or leisure and family role activities. Promotion of a healthy lifestyle at a younger age encourages every person to monitor and take responsibility for their own health, which is a necessary strategy to ensure active participation at an older age, and thus improve their well-being.
Fulltext What matters for life satisfaction among the oldest-old? Evidence from China

Ng ST, Tey NP, Asadullah MN

PLoS One, 2017;12(2):e0171799.
PMID: 28187153 DOI: 10.1371/journal.pone.0171799

OBJECTIVE: The world population is aging rapidly and the well-being of older people is of great interest. Therefore, this study investigates the determinants of life satisfaction among the oldest-old (i.e. individuals aged 80 or over) in China.
MATERIALS AND METHODS: We use the 2011/2012 Chinese Longitudinal Healthy Longevity Survey data (n = 6530) for this paper. Logistic regression is used to analyse the effects of socio-demographic, economic, health, instrumental activities of daily living, family and community factors on life satisfaction and depression among the oldest-old in China.
RESULTS: Our analysis confirms the significance of many factors affecting life satisfaction among the oldest-old in China. Factors that are correlated with life satisfaction include respondent's sex, education, place of residence, self-rated health status, cognitive ability (using mini mental state examination), regular physical examination, perceived relative economic status, access to social security provisions, commercialized insurances, living arrangements, and number of social services available in the community (p<0.05 for all these variables). Although life satisfaction is negatively associated with instrumental activities of daily living (β = -0.068, 95%CI = -.093-.043), and depression (β = -0.463, 95%CI = -.644-.282), the overall effect of self-rated health status is positive (p<0.001). This confirms the primacy of health as the determinant of well-being among the oldest-old.
CONCLUSIONS: Majority of the oldest-old in China rated their life satisfaction as good or very good. Our findings show that health and economic status are by far the most significant predictors of life satisfaction. Our finding on the primacy of health and relative income as determinants of well-being among the oldest-old, and the greater influence of self-rated health status over objective health measures is consistent with the findings of many past studies. Our results suggest that efforts should be directed at enhancing family support as well as health and social service provisions in the community to improve life satisfaction of older people.
AGE AT MENARCHE AND SEXUAL DEBUT AMONG YOUNG FILIPINO WOMEN

Tey NP, Lai SL, Ng ST

J Biosoc Sci, 2019 01;51(1):77-94.
PMID: 29352813 DOI: 10.1017/S0021932017000682

There has been a secular decline in age at menarche since the 19th century. Early-maturing women are more likely to have their sexual debut at a younger age, which in turn gives rise to a host of reproductive health and social problems. This study used data from five waves of National Demographic and Health Surveys conducted in the Philippines between 1993 and 2013 to examine the trends and socioeconomic differentials in age at menarche and sexual debut. The changing trend in age at menarche and sexual debut was examined across birth cohorts, and logistic regressions were used to identify the determinants of early sexual debut. In the Philippines, the mean and median ages at menarche declined from 13.2 years and 12.6 years, respectively, among young women born in 1973-1977, to 12.9 years and 12.3 years, respectively, among those born in 1993-1997. The proportion who had their sexual debut by age 20 increased from 41.2% for the 1968-1972 birth cohort to 53.4% for the 1988-1992 birth cohort. Filipino women with low education, from poor families and living in rural areas were more likely to have earlier sexual debut despite attaining menarche at a later age as compared with their higher educated counterparts, and those from wealthier families and urban areas. Logistic regression analysis showed that, besides marital status, women's education and age at menarche were important determinants of early sexual debut. However, ethnicity, place of residence and family wealth had no significant effects on age at menarche. An increasing proportion of young women were found to be having unprotected sexual debut and at a younger age, with health and social ramifications. Hence, apart from increasing the enrolment of girls in schools and discouraging teenage marriage, there is a need for social and health agencies to implement appropriate adolescent sexual and reproductive health programmes such as counselling and educational campaigns, as well as support services, to address sexual problems among the youth.
Fulltext Family support and loneliness among older persons in multiethnic Malaysia

Teh JK, Tey NP, Ng ST

ScientificWorldJournal, 2014;2014:654382.
PMID: 25383374 DOI: 10.1155/2014/654382

This study investigates factors affecting older persons' state of loneliness in multiethnic Malaysia using data from the 2004 Malaysian Population and Family Survey, the first nationally representative sample in Malaysia. The study sample was extracted to include Malays, Chinese, Indians and other Indigenous groups aged 60 and above, and who had children (n = 1791). Cross tabulations and ordinal logistic regression methods were used in the analysis. Among the ethnic groups, older Malays were more likely than their Chinese and Indian counterparts to experience loneliness. Loneliness was found to be associated with age, marital status, education level, sources of income, health status, and physical limitations. Among older people, feelings of loneliness were inversely related with coresidence with adult children and participation in religious activities. Sociodemographic changes have eroded the traditional family support system for the elderly, while social security remains inadequate. This study shows the important role of family in alleviating loneliness among older people. Hence the need to promote and facilitate coresidence, as well as participation in religious activities, and a healthy lifestyle as a priority strategy is in line with the objectives of the National Policy for the Older People.
Fulltext Ethnic and gender differentials in non-communicable diseases and self-rated health in Malaysia

Teh JK, Tey NP, Ng ST

PLoS One, 2014;9(3):e91328.
PMID: 24603609 DOI: 10.1371/journal.pone.0091328

OBJECTIVES: This paper examines the ethnic and gender differentials in high blood pressure (HBP), diabetes, coronary heart disease (CHD), arthritis and asthma among older people in Malaysia, and how these diseases along with other factors affect self-rated health. Differentials in the prevalence of non-communicable diseases among older people are examined in the context of socio-cultural perspectives in multi-ethnic Malaysia.

METHODS: Data for this paper are obtained from the 2004 Malaysian Population and Family Survey. The survey covered a nationally representative sample of 3,406 persons aged 50 and over, comprising three main ethnic groups (Malays, Chinese and Indians) and all other indigenous groups. Bivariate analyses and hierarchical logistic regression were used in the analyses.

RESULTS: Arthritis was the most common non-communicable disease (NCD), followed by HBP, diabetes, asthma and CHD. Older females were more likely than males to have arthritis and HBP, but males were more likely to have asthma. Diabetes and CHD were most prevalent among Indians, while arthritis and HBP were most prevalent among the Indigenous groups. Older people were more likely to report poor health if they suffered from NCD, especially CHD. Controlling for socio-economic, health and lifestyle factors, Chinese were least likely to report poor health, whereas Indians and Indigenous people were more likely to do so. Chinese that had HBP were more likely to report poor health compared to other ethnic groups with the same disease. Among those with arthritis, Indians were more likely to report poor health.

CONCLUSION: Perceived health status and prevalence of arthritis, HBP, diabetes, asthma and CHD varied widely across ethnic groups. Promotion of healthy lifestyle, early detection and timely intervention of NCDs affecting different ethnic groups and gender with socio-cultural orientations would go a long way in alleviating the debilitating effects of the common NCDs among older people.
Investigation of the Tiger Milk Medicinal Mushroom, Lignosus rhinocerotis (Agaricomycetes), as an Antiulcer Agent

Nyam KL, Chang CY, Tan CS, Ng ST

Int J Med Mushrooms, 2016;18(12):1093-1104.
PMID: 28094747 DOI: 10.1615/IntJMedMushrooms.v18.i12.40

The aim of this study was to determine the antiulcer activity of Lignosus rhinocerotis in rats. A total of 48 Sprague-Dawley rats were used in ethanol-induced, aspirin-induced, and water immersion-restraint stress-induced ulcer models. Rats were equally divided into 4 groups for each model and orally administered 5 mL/kg distilled water, 20 mg/kg omeprazole, as well as 250 and 500 mg/kg of L. rhinocerotis powder. L. rhinocerotis powder at both 250 and 500 mg/kg doses demonstrated significant (P < 0.05) protection against gastric ulceration in all the induced ulcer models. Histological studies revealed severe damage and hemorrhage of gastric mucosa in the negative control group for all ulcer-induced models. The study suggests that L. rhinocerotis powder possesses dose-dependent antiulcer activity in the gastric mucosa, as ascertained grossly and histologically, compared with the negative control groups.
Productive engagement of older adults in China: A multilevel analysis

Sia BK, Tey NP, Goh KL, Ng ST

Geriatr Gerontol Int, 2021 Dec;21(12):1138-1146.
PMID: 34700364 DOI: 10.1111/ggi.14299

AIM: This study investigates how the personal characteristics and behavior, and health status of older adults in China influenced their productive engagement in paid and unpaid jobs.
METHODS: Data for this analysis came from 2002, 2005, 2008 and 2011 waves of the Chinese Longitudinal Healthy Longevity Survey (CLHLS). We used a random intercept multilevel multinomial logit model to analyze data from 3208 older adults aged 65 from the 2002 wave, which decreased to 1385 in 2011. The main study variable is older adults' engagement in paid jobs and unpaid work (including housework, care-taking, poultry farming, and planting vegetables that have an economic value).
RESULTS: There was a strong association between older adults' productive engagement and their functional limitations to daily living activities, health and healthy behavior. Older adults with inadequate finance were more likely to be working to support themselves. Those who exercised less and living in the provinces with higher GDP were less likely to work post-retirement. Chronic diseases, advances in age, no education and rural residence did not deter older adults from doing unpaid work.
CONCLUSION: Older adults in China were actively engaged in paid and unpaid activities. Efforts to support the active engagement of older adults require all stakeholders to promote healthy living, facilitate social engagements and provide an age-friendly work environment. Geriatr Gerontol Int 2021; 21: 1138-1146.
Antidiabetic Properties of the Tiger's Milk Medicinal Mushroom, Lignosus rhinocerotis (Agaricomycetes), in Streptozotocin-Induced Diabetic Rats

Nyam KL, Chow CF, Tan CS, Ng ST

Int J Med Mushrooms, 2017;19(7):607-617.
PMID: 29199582 DOI: 10.1615/IntJMedMushrooms.2017021186

Diabetes mellitus is a major cause of morbidity and mortality worldwide. Although scientific evidence supporting its therapeutic efficacy is lacking, the use of the tiger's milk mushroom (TGM; Lignosus rhinocerotis), which is native to tropical areas such as Malaysia, Indonesia, and the Philippines, has been found to contain a very large amount of potential antioxidants. In this study, rats were weighed and then intravenously injected with 35 mg/kg streptozotocin (STZ). Rats were left for 1 week before blood glucose concentrations were measured to determine the onset of diabetes before the next procedure was conducted. Rats with blood glucose exceeding 7.0 mmol/L were considered diabetic and were included in the experiment. All groups were fed their respective treatments twice daily for 2 months throughout the experiment. Antidiabetic and antioxidant properties of freeze-dried TGM powder, such as reduced glutathione (GSH), superoxide dismutase (SOD), lipid peroxidation (LPO), and catalase (CAT) activities, were investigated in liver samples. The biological compounds present in the freeze-dried TGM powder was found to exhibit antidiabetic properties by significantly reducing elevated blood glucose concentrations to a normal range (3.0-7.0 mmol/L) in Sprague-Dawley rats with streptozotocin-induced diabetes, and increasing the body weight of the rats. Freeze-dried TGM powder was also found to possess antioxidant activity by significantly increasing GSH, CAT, and SOD activities while reducing LPO (P < 0.05). THis study shows that freeze-dried TGM powder exhibits significant antidiabetic properties and may be a potential supplement in ameliorating diabetic complications.
Fulltext Transcriptome Analysis Revealed Highly Expressed Genes Encoding Secondary Metabolite Pathways and Small Cysteine-Rich Proteins in the Sclerotium of Lignosus rhinocerotis

Yap HY, Chooi YH, Fung SY, Ng ST, Tan CS, Tan NH

PLoS One, 2015;10(11):e0143549.
PMID: 26606395 DOI: 10.1371/journal.pone.0143549

Lignosus rhinocerotis (Cooke) Ryvarden (tiger milk mushroom) has long been known for its nutritional and medicinal benefits among the local communities in Southeast Asia. However, the molecular and genetic basis of its medicinal and nutraceutical properties at transcriptional level have not been investigated. In this study, the transcriptome of L. rhinocerotis sclerotium, the part with medicinal value, was analyzed using high-throughput Illumina HiSeqTM platform with good sequencing quality and alignment results. A total of 3,673, 117, and 59,649 events of alternative splicing, novel transcripts, and SNP variation were found to enrich its current genome database. A large number of transcripts were expressed and involved in the processing of gene information and carbohydrate metabolism. A few highly expressed genes encoding the cysteine-rich cerato-platanin, hydrophobins, and sugar-binding lectins were identified and their possible roles in L. rhinocerotis were discussed. Genes encoding enzymes involved in the biosynthesis of glucans, six gene clusters encoding four terpene synthases and one each of non-ribosomal peptide synthetase and polyketide synthase, and 109 transcribed cytochrome P450 sequences were also identified in the transcriptome. The data from this study forms a valuable foundation for future research in the exploitation of this mushroom in pharmacological and industrial applications.
Nutritional composition, antioxidant properties, and toxicology evaluation of the sclerotium of Tiger Milk Mushroom Lignosus tigris cultivar E

Kong BH, Tan NH, Fung SY, Pailoor J, Tan CS, Ng ST

Nutr Res, 2016 Feb;36(2):174-83.
PMID: 26598045 DOI: 10.1016/j.nutres.2015.10.004

The Tiger Milk Mushroom (Lignosus spp.) is an important medicinal mushroom in Southeast Asia and has been consumed frequently by the natives as a cure for a variety of illnesses. In this study, we hypothesized that Lignosus tigris (cultivar E) sclerotium may contain high nutritional value and antioxidant properties, is nontoxic and a potential candidate as a dietary supplement. The chemical and amino acid compositions of the sclerotium were evaluated and antioxidant activities of the sclerotial extracts were assessed using ferric reducing antioxidant power; 1,1-diphenyl-2-picrylhydrazyl; and superoxide anion radical scavenging assays. Acute toxicity of the L. tigris E sclerotium was assessed using a rat model study. The sclerotium was found to be rich in carbohydrate, protein, and dietary fibers with small amounts of fat, calories, and sugar. The amino acid composition of the protein contains all essential amino acids, with a protein score of 47. The sclerotial extracts contain phenolics, terpenoids, and glucan. The ferric reducing antioxidant power values of the various sclerotial extracts (hot water, cold water, and methanol) ranged from 0.008 to 0.015 mmol min(-1) g(-1) extract, while the 1,1-diphenyl-2-picrylhydrazyl and superoxide anion radical scavenging activities ranged from 0.11 to 0.13, and -2.81 to 9.613 mmol Trolox equivalents g(-1) extract, respectively. Acute toxicity assessment indicated that L. tigris E sclerotial powder was not toxic at the dose of 2000 mg kg(-1). In conclusion, L. tigris E sclerotium has the potential to be developed into a functional food and nutraceutical.
Fulltext Genome-based proteomic analysis of Lignosus rhinocerotis (Cooke) Ryvarden sclerotium

Yap HY, Fung SY, Ng ST, Tan CS, Tan NH

Int J Med Sci, 2015;12(1):23-31.
PMID: 25552915 DOI: 10.7150/ijms.10019

Lignosus rhinocerotis (Cooke) Ryvarden (Polyporales, Basidiomycota), also known as the tiger milk mushroom, has received much interest in recent years owing to its wide-range ethnobotanical uses and the recent success in its domestication. The sclerotium is the part with medicinal value. Using two-dimensional gel electrophoresis coupled with mass spectrometry analysis, a total of 16 non-redundant, major proteins were identified with high confidence level in L. rhinocerotis sclerotium based on its genome as custom mapping database. Some of these proteins, such as the putative lectins, immunomodulatory proteins, superoxide dismutase, and aegerolysin may have pharmaceutical potential; while others are involved in nutrient mobilization and the protective antioxidant mechanism in the sclerotium. The findings from this study provide a molecular basis for future research on potential pharmacologically active proteins of L. rhinocerotis.
Fulltext Anti-inflammatory effect of the sclerotium of Lignosus rhinocerotis (Cooke) Ryvarden, the Tiger Milk mushroom

Lee SS, Tan NH, Fung SY, Sim SM, Tan CS, Ng ST

BMC Complement Altern Med, 2014;14:359.
PMID: 25256382 DOI: 10.1186/1472-6882-14-359

The sclerotium of Lignosus rhinocerotis (Cooke) Ryvarden (Tiger Milk mushroom) is used as a traditional medicine to relieve cough, asthma and chronic hepatitis. The traditional uses of the sclerotium are presumably related to its anti-inflammatory effect. The present study was carried out to evaluate the anti-inflammatory activity of the sclerotial powder of L. rhinocerotis (Cooke) Ryvarden (Tiger Milk mushroom) cultivar TM02.
Fulltext Energy and nutritional composition of Tiger milk mushroom (Lignosus tigris Chon S. Tan) sclerotia and the antioxidant activity of its extracts

Yap HY, Aziz AA, Fung SY, Ng ST, Tan CS, Tan NH

Int J Med Sci, 2014;11(6):602-7.
PMID: 24782649 DOI: 10.7150/ijms.8341

The Lignosus is a genus of fungi that have useful medicinal properties. In Southeast Asia, three species of Lignosus (locally known collectively as Tiger milk mushrooms) have been reported including L. tigris, L. rhinocerotis, and L. cameronensis. All three have been used as important medicinal mushrooms by the natives of Peninsular Malaysia. In this work, the nutritional composition and antioxidant activities of the wild type and a cultivated strain of L. tigris sclerotial extracts were investigated. The sclerotia are rich in carbohydrates with moderate amount of protein and low fat content. Free radical scavenging activities of L. tigris sclerotial extracts correlate with their phenolic content, which ranges from 6.25 to 45.42 mg GAE/g extract. The FRAP values ranged from 0.002 to 0.041 mmol/min/g extract, while the DPPH(•), ABTS(•+), and superoxide anion (SOA) scavenging activities ranged from 0.18 to 2.53, 0.01 to 0.36, and -4.53 to 10.05 mmol Trolox equivalents/g extract, respectively. L. tigris cultivar shows good prospect to be developed into functional food due to its good nutritional value and potent SOA scavenging activity.
Shotgun proteomic analysis of tiger milk mushroom (Lignosus rhinocerotis) and the isolation of a cytotoxic fungal serine protease from its sclerotium

Yap HY, Fung SY, Ng ST, Tan CS, Tan NH

J Ethnopharmacol, 2015 Nov 4;174:437-51.
PMID: 26320692 DOI: 10.1016/j.jep.2015.08.042

The sclerotium of Lignosus rhinocerotis (Cooke) Ryvarden (tiger milk mushroom) has been traditionally used as a complementary and alternative medicine for cancer treatment by the local communities of Southeast Asia. Despite the continuous research interest in its antiproliferative activity, the identity of the bioactive compound(s) responsible has yet to be determined. This study aims to bridge the gap in existing research literature by using proteomics approach for investigation of the nature of the anticancer substance of L. rhinocerotis.
Comparative EST analyses provide insights into gene expression in two asexual developmental stages of Eimeria tenella

Ng ST, Sanusi Jangi M, Shirley MW, Tomley FM, Wan KL

Exp Parasitol, 2002 11 13;101(2-3):168-73.
PMID: 12427472

The protozoan parasite Eimeria tenella has a complex life cycle that includes two major asexual developmental stages, the merozoite and the sporozoite. The expressed sequence tag (EST) approach has been previously used to study gene expression of merozoites. We report here the generation and analysis of 556 ESTs from sporozoites. Comparative analyses of the two datasets reveal a number of transcripts that are preferentially expressed in a specific stage, including previously uncharacterised sequences. The data presented indicate the invaluable potential of the comparative EST analysis for providing information on gene expression patterns in the different developmental stages of E. tenella.
Nutritional evaluation on Lignosus cameronensis C. S. Tan, a medicinal Polyporaceae

Fung SY, Cheong PCH, Tan NH, Ng ST, Tan CS

IUBMB Life, 2019 07;71(7):821-826.
PMID: 30629799 DOI: 10.1002/iub.2006

Sclerotial powder of a cultivated species of the Tiger Milk Mushroom, Lignosus cameronensis was analysed for its nutritional components and compared against species of the same genus, Lignosus rhinocerus and Lignosus tigris. All three species have been used by indigenous tribes in Peninsular Malaysia as medicinal mushrooms. Content of carbohydrate, fibre, mineral, amino acid, palatable index, fat, ash and moisture were determined. L. cameronensis sclerotial material consists of carbohydrate (79.7%), protein (12.4%) and dietary fibre (5.4%) with low fat (1.7%) and no free sugar. It has the highest content of total carbohydrate (791 g kg-1 ), energy value (3,700 kcal kg-1 ) and calcium (0.85 g kg-1 ). The crude protein content (123 g kg-1 ) is comparable to that of L. rhinocerus with its main amino acids consisting of glutamic acid, aspartic acid and leucine. The umami index is determined to be 0.27. The total essential amino acid (45 g kg-1 ) is comparable to that of L. tigris. The main mineral is potassium (1.51 g kg-1 ) and the Na/K ratio was <0.6. Heavy metals such as mercury, cadmium, lead and arsenic were absent. L. cameronensis has the highest amount of food energy, total carbohydrate and calcium compared to those of both L. rhinocerus and L. tigris. The essential amino acids comprised almost 40% of the total amino acid content, slightly more than that reported from sclerotial powder of the L. tigris. © 2019 IUBMB Life, 9999(9999):1-6, 2019.
A survey of genes in Eimeria tenella merozoites by EST sequencing

Wan KL, Chong SP, Ng ST, Shirley MW, Tomley FM, Jangi MS

Int J Parasitol, 1999 Dec;29(12):1885-92.
PMID: 10961844

A study of about 500 expressed sequence tags (ESTs), derived from a merozoite cDNA library, was initiated as an approach to generate a larger pool of gene information on Eimeria tenella. Of the ESTs, 47.7% had matches with entries in the databases, including ribosomal proteins, metabolic enzymes and proteins with other functions, of which 14.3% represented previously known E. tenella genes. Thus over 50% of the ESTs had no significant database matches. The E. tenella EST dataset contained a range of highly abundant genes comparable with that found in the EST dataset of T. gondii and may thus reflect the importance of such molecules in the biology of the apicomplexan organisms. However, comparison of the two datasets revealed very few homologies between sequences of apical organelle molecules, and provides evidence for sequence divergence between these closely-related parasites. The data presented underpin the potential value of the EST strategy for the discovery of novel genes and may allow for a more rapid increase in the knowledge and understanding of gene expression in the merozoite life cycle stage of Eimeria spp.
Fulltext Proteins from Lignosus tigris with selective apoptotic cytotoxicity towards MCF7 cell line and suppresses MCF7-xenograft tumor growth

Kong BH, Teoh KH, Tan NH, Tan CS, Ng ST, Fung SY

PeerJ, 2020;8:e9650.
PMID: 32832273 DOI: 10.7717/peerj.9650

Background: Lignosus tigris, a recently discovered species of the unique Lignosus family, has been traditionally used by the indigenous communities in Peninsular Malaysia to treat various ailments and as an alternative medicine for cancer treatment. The L. tigris cultivar sclerotia (Ligno TG-K) was found to contain numerous bioactive compounds with beneficial biomedicinal properties and the sclerotial extract exhibited potent antioxidant activity. However, the anticancer property of the Ligno TG-K including in vitro and in vivo antitumor effects as well as its anticancer active compounds and the mechanisms has yet to be investigated.
Methods: The cytotoxicity of the Ligno TG-K against human breast (MCF7), prostate (PC3) and lung (A549) adenocarcinoma cell lines was evaluated using MTT cytotoxicity assay. The cytotoxic mechanisms of the active high molecular weight proteins (HMWp) fraction were investigated through detection of caspases activity and apoptotic-related proteins expression by Western blotting. The in vivo antitumor activity of the isolated HMWp was examined using MCF7 mouse xenograft model. Shotgun LC-MS/MS analysis was performed to identify the proteins in the HMWp.
Results and Discussion: Cold water extract of the sclerotia inhibited proliferation of MCF7, A549 and PC3 cells with IC50 ranged from 28.9 to 95.0 µg/mL. Bioassay guided fractionation of the extract revealed that HMWp exhibited selective cytotoxicity against MCF7 cells via induction of cellular apoptosis by the activation of extrinsic and intrinsic signaling pathways. HMWp activated expression of caspase-8 and -9 enzymes, and pro-apoptotic Bax protein whilst inhibiting expression of tumor survivor protein, Bcl-2. HMWp induced tumor-cell apoptosis and suppressed growth of tumor in MCF-7 xenograft mice. Lectins, serine proteases, RNase Gf29 and a 230NA deoxyribonuclease are the major cytotoxic proteins that accounted for 55.93% of the HMWp.
Conclusion: The findings from this study provided scientific evidences to support the traditional use of the L. tigris sclerotia for treatment of breast cancer. Several cytotoxic proteins with high abundance have been identified in the HMWp of the sclerotial extract and these proteins have potential to be developed into new anticancer agents or as adjunct cancer therapy.

Filters

Please provide feedback to Administrator ([email protected])

External Links