Displaying publications 61 - 80 of 186 in total

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  1. Altholactone, a novel styryl-lactone induces apoptosis via oxidative stress in human HL-60 leukemia cells
    Inayat-Hussain SH, Osman AB, Din LB, Taniguchi N
    Toxicol Lett, 2002 May 28;131(3):153-9.
    PMID: 11992734
    Plant styryl-lactone derivatives isolated from Goniothalamus sp. are potential compounds for cancer chemotherapy. In this study, we have examined the mechanisms of apoptosis induced by altholactone, a stryl-lactone isolated from the Malaysian plant G. malayanus on human HL-60 promyelocytic leukemia cells. Flow cytometric analysis of the externalization of phosphatidylserine (PS) using the annexin V/PI method on altholactone treated HL-60 cells showed a concentration-dependent increase of apoptosis from concentrations ranging from 10.8 (2.5 microg/ml) to 172.4 microM (40 microg/ml). Pre-treatment with the antioxidant N-acetylcysteine (1 mM) completely abrogated apoptosis induced by altholactone, suggesting for the involvement of oxidative stress. Further flow cytometric assessment of the level of intracellular peroxides using the fluorescent probe 2',7'-dichlorofluorescein diacetate (DCFH-DA) confirmed that altholactone induced an increase in cellular oxidative stress in HL-60 cells which was suppressed by N-acetylcysteine. In summary, our results demonstrate for the first time that altholactone induced apoptosis in HL-60 cells occurs via oxidative stress.
    Matched MeSH terms: Flow Cytometry
  2. Influence of race, age and sex on the lymphocyte subsets in peripheral blood of healthy Malaysian adults
    Choong ML, Ton SH, Cheong SK
    Ann. Clin. Biochem., 1995 Nov;32 ( Pt 6):532-9.
    PMID: 8579284
    The lymphocyte subsets in the peripheral blood of healthy Malaysian adults (212 subjects, age 18-71 years) were analysed using a flow cytometer FACScan in an effort to establish a reference range for the lymphocyte subsets. The lymphocyte subsets studied were T cells (CD3), B cells (CD19), natural killer (NK) cells (CD3- CD16+/CD56+), helper/inducer cells (CD4), cytotoxic/suppressor cells (CD8) and the helper/suppressor ratio (CD4/CD8). The distributions of T cells, CD4 cells and CD8 cells were symmetric about their means while B cells, NK cells and CD4/CD8 ratio followed a skewed distribution. Differences in race were observed for T cells, NK cells, CD4 cells and CD4/CD8 ratio where the Indians were significantly different from the Malays and the Chinese (higher T cells, CD4 cells and CD4/CD8 ratio and lower NK cells). The B cells were significantly lower in the Chinese than the Malays and the Indians. Age differences were seen only in the Chinese where increased CD4 cells and CD4/CD8 ratio, and decreased CD8 cells were observed. A sex difference was observed only in the Chinese where the CD4/CD8 ratio was significantly higher in females than males.
    Matched MeSH terms: Flow Cytometry
  3. The distribution of immunoregulatory cells in the peripheral blood of normal Malaysian adults
    Chin SF, Cheong SK, Lim YC, Ton SH
    Malays J Pathol, 1993 Jun;15(1):49-52.
    PMID: 8277790
    The distribution of immunoregulatory cells in the peripheral blood of an individual has now been established as an important tool in helping the management of several diseases. It is necessary to set the normal ranges of these cells for the laboratory. We have undertaken in this study to establish the reference ranges for normal Malaysian adults. We found that the mean percentages of T cells, B cells, T Helper cells (CD4), T suppressor cells (CD8), NK cells and the ratio of CD4/CD8 were 70.91%, 11.38%, 38.15%, 37.76%, 17.45%, and 1.00 respectively. There was no significant difference between the sexes. In certain parameters, there was significant differences between Malay, Chinese and Indians. The Chinese and Indians were significantly different in the distribution of B cells and in the CD4/CD8 ratio. In the case of CD4 and NK cells, the Indians were different from the other two groups.
    Matched MeSH terms: Flow Cytometry
  4. Biphenotypic hybrid acute leukaemia detected by two colour flow cytometry
    Gudum HR, Chin YM, Menaka N, Jeyaranee S, Lin HP, Tay A
    Malays J Pathol, 1992 Jun;14(1):25-8.
    PMID: 1469914
    Immunophenotypic studies using immunofluorescent flow cytometry were performed on the blast cells of 36 patients with acute leukaemia using a panel of eight monoclonal antibodies. Six patients had blasts which co-expressed markers for lymphoid and myeloid differentiation, and which were therefore defined as biphenotypic hybrid acute leukaemia. Of the six, three patients were in the paediatric age group (below 12 years old) while the other three were more than 12 years old. Peripheral blood counts were variable; however, bone marrow infiltration was extensive (blasts > or = 75% in all). At the time of study, remission was achieved in only two patients. The authors' data show that biphenotypic hybrid acute leukaemia is not rare in Malaysia. This represents a subgroup of acute leukaemia identifiable by immunophenotyping but not by the French-American-British classification based on morphological and basic cytochemical studies alone. The recognition of this subgroup is important for both practical and theoretical reasons. There are implications for treatment of the individual patient because treatment directed at a single lineage may not be effective. The two colour flow cytometry proved to be a useful tool for diagnosis and classification of acute leukaemia.
    Matched MeSH terms: Flow Cytometry
  5. Fulltext Experimental exposure of Burkholderia pseudomallei crude culture filtrate upregulates PD-1 on T lymphocytes
    Menon N, Mariappan V, Vellasamy KM, Samudi C, See JX, Ganesh PS, et al.
    Access Microbiol, 2020;2(5):acmi000110.
    PMID: 32974575 DOI: 10.1099/acmi.0.000110
    Burkholderia pseudomallei is the causative agent for melioidosis. Because of its intracellular nature, the bacterium is capable of replicating within a plethora of eukaryotic cell lines. B. pseudomallei can remain dormant within host cells without symptoms for years, causing recrudescent infections. Here, we investigated the pathogenesis mechanism behind the suppression of T cell responses by B. pseudomallei . Peripheral blood mononuclear cells (1×106 cells/well) isolated by Ficoll Paque (Sigma-Aldrich) density gradient centrifugation were incubated with optimized concentrations of bacterial crude culture filtrate antigens (CFAs) (10 ug ml-1) and heat-killed bacteria [1 : 10 multiplicity of infection (m.o.i.)]. Following incubation, cells were investigated for surface expression of coinhibitory molecules by flow cytometry. We found that B. pseudomallei induced the upregulation of programmed death 1 (PD-1), a molecule responsible for T cell exhaustion, on T cells in vitro following exposure to crude CFAs of B. pseudomallei . This upregulation of PD-1 probably contributes to poor immune surveillance and disease pathogenesis.
    Matched MeSH terms: Flow Cytometry
  6. Fulltext Correlation between corresponding protein and MRNA in acute myeloid leukaemia (AML)
    Siti Zuleha Idris, Stephnie Yiau Kang Xian, Lee CinDee, Eusni Rahayu Mohd. Tohit, Chang Kian Meng, Maha Abdullah
    Malaysian Journal of Medicine and Health Sciences, 2019;15(108):43-43.
    MyJurnal
    Introduction: Protein and gene expressions are intensively profiled for potential biomarkers in diagnosis or prognosis of diseases. The correlation between corresponding protein and mRNA of a gene is important to establish whether transcript levels of a given gene can be used as proxies for the corresponding protein levels. mRNA profiling is more commonly utilised as this method is cheaper and the technology more advanced. Acute myeloid leukaemia (AML) is a heterogeneous group of malignant precursors of the myeloid lineage that leads to death if not treated. Cytokines and death receptors are commonly evaluated in this disease in search of potential biomarkers; however, the mRNA/protein correlations of these biomarkers are still unclear. Methods: Semi-quantitative expression of mRNA expression and protein levels of IL-1β, IL-18Rα, IL-6, TNF-α and DR5 were measured by conventional polymerase reaction (PCR) and flow cytometry in 11 cases of AML at diagnosis. Correlation in the intensity of the PCR amplicon and corre-sponding mean fluorescence intensity of protein was determined by Spearman’s rank correlation test. Results: None of the cytokines/death receptor was significantly correlated except IL-6 (Rs= -0.6287, p=0.038). Unexpectedly, this was also a significant negative correlation. Conclusion: For the majority of selected biomarkers in AML, whether secreted or surface-expressed, mRNA and protein expressions were not significantly correlated. The strong negative correlation for IL-6 is worth further investigation.
    Matched MeSH terms: Flow Cytometry
  7. Fulltext Cytotoxicity of Snake Venoms and Cytotoxins From Two Southeast Asian Cobras (Naja sumatrana, Naja kaouthia): Exploration of Anticancer Potential, Selectivity, and Cell Death Mechanism
    Chong HP, Tan KY, Tan CH
    Front Mol Biosci, 2020;7:583587.
    PMID: 33263003 DOI: 10.3389/fmolb.2020.583587
    Venoms of cobras (Naja spp.) contain high abundances of cytotoxins, which contribute to tissue necrosis in cobra envenomation. The tissue-necrotizing activity of cobra cytotoxins, nevertheless, indicates anticancer potentials. This study set to explore the anticancer properties of the venoms and cytotoxins from Naja sumatrana (equatorial spitting cobra) and Naja kaouthia (monocled cobra), two highly venomous species in Southeast Asia. The cytotoxicity, selectivity, and cell death mechanisms of their venoms and cytotoxins (NS-CTX from N. sumatrana: NS-CTX; N. kaouthia: NK-CTX) were elucidated in human lung (A549), prostate (PC-3), and breast (MCF-7) cancer cell lines. Cytotoxins were purified through a sequential fractionation approach using cation-exchange chromatography, followed by C18 reverse-phase high-performance liquid chromatography (HPLC) to homogeneity validated with sodium dodecyl sulfate-polyacrylamide gel electrophoresis, and identified by liquid chromatography-tandem mass spectrometry (LCMS/MS). The cobra venoms and their respective cytotoxins exhibited concentration-dependent growth inhibitory effects in all cell lines tested, with the cytotoxins being more potent compared to the corresponding whole venoms. NS-CTX and NK-CTX are, respectively, P-type and S-type isoforms of cytotoxin, based on the amino acid sequences as per LCMS/MS analysis. Both cytotoxins exhibited differential cytotoxic effects in the cell lines tested, with NS-CTX (P-type cytotoxin) being significantly more potent in inhibiting the growth of the cancer cells. Both cytotoxins demonstrated promising selectivity only for the A549 lung cancer cell line (selectivity index = 2.17 and 2.26, respectively) but not in prostate (PC-3) and breast (MCF-7) cancer cell lines (selectivity index < 1). Flow cytometry revealed that the A549 lung cancer cells treated with NS-CTX and NK-CTX underwent necrosis predominantly. Meanwhile, the cytotoxins induced mainly caspase-independent late apoptosis in the prostate (PC-3) and breast (MCF-7) cancer cells lines but lacked selectivity. The findings revealed the limitations and challenges that could be faced during the development of new cancer therapy from cobra cytotoxins, notwithstanding their potent anticancer effects. Further studies should aim to overcome these impediments to unleash the anticancer potentials of the cytotoxins.
    Matched MeSH terms: Flow Cytometry
  8. Fulltext Extensive Forehead Swelling Including the Periorbital Area in a Child: A Rare Manifestation of Acute Lymphoblastic Leukemia
    Hanapi MS, Ghani SI, Sonny Teo KS, Wan-Embong WZ, Ariffin N, Wan Hitam WH
    Cureus, 2018 Nov 03;10(11):e3539.
    PMID: 30648072 DOI: 10.7759/cureus.3539
    Acute lymphoblastic leukemia (ALL) manifestations in a child are varied. We report a unique and rare presentation of acute lymphoblastic leukemia in a child who presented with frontal swelling involving bilateral upper lids. A previously healthy one-year-old girl presented with progressively increasing frontal swelling of seven months duration. An examination revealed erythematous, firm, nontender forehead swelling that extended up to the medial part of bilateral upper eye lids. The extraocular muscle movement was normal. The anterior segment and fundus examination were also normal in both eyes. Other systemic examination revealed multiple leukemic cutis on the scalp. The cervical lymph nodes were also palpable with hepatosplenomegaly. A full blood picture (FBP) showed the presence of leucoerythroblastic blood film with 62% blast cells. Flow cytometry and bone marrow aspiration confirmed the diagnosis. Computed tomographic (CT) scan images revealed multiple well-defined hyperdense lesions at the subcutaneous skull with the largest lesion at the anterior glabella. Upon diagnosis, the patient was started on chemotherapy and the swelling resolved after one month post treatment. Extensive forehead swelling is a rare manifestation of acute lymphoblastic leukemia. A high index of suspicion aided with diagnostic investigations could help the doctors arrive at a correct diagnosis and treatment.
    Matched MeSH terms: Flow Cytometry
  9. Fulltext Selective cytotoxicity effects of cytobiotics produced by lactic acid bacteria isolated from Malaysian foods
    Hooi Ling Foo
    Malaysian Journal of Medicine and Health Sciences, 2019;15(108):7-7.
    MyJurnal
    Probiotics are live microorganisms and when consumed in adequate amounts will confer health benefit on the host. Probiotic effects of Lactic Acid Bacteria (LAB) have been reported extensively, which rely generally on the viability of LAB cells. However, we have reported extensively the prominent probiotic effects of cell less postbiotics metabolites produced by various strains of Lactobacillus plantarum isolated from Malaysian foods on rats, poultry and pigs. L. plantarum is a major species of LAB. Despite the emerging evidence of anticancer properties of LAB, very limited information is available on the cytotoxic and antiproliferative activities of cytobiotic metabolites produced by LAB. Recently, we have documented the selective antiproliferative and cytotoxicity of cytobiotic produced by six strains of L. plantarum on normal human primary cells, breast, colorectal, cervical, liver and leukemia cancer cell lines via MTT assay, trypan blue exclusion method and BrdU assay. Haemolytic assay was used to determine the toxicity of cytobiotic using human and various animal red blood cells. The cytotoxicity mode was subsequently determined for selected UL4 cytobiotic on MCF-7 cells due to its pronounced cytotoxic effect by fluorescent microscopic ob-servation using AO/PI dye reagents and flow cytometric analyses. The selective cytotoxicity effect on various cancel cells that occurred in a strain-specific and cancer cell type-specific manner whilst sparing the normal cells will be discussed in the presentation. Moreover, the antiproliferative effects and induction of late apoptosis effects against selected malignant cancer cells will be discussed further in the presentation. This report reveals the vast potential of cytobiotics produced by L. plantarum strains as functional supplement and as an adjunctive treatment for cancer.
    Matched MeSH terms: Flow Cytometry
  10. Fulltext Isolation, characterization and the multi-lineage differentiation potential of rabbit bone marrow-derived mesenchymal stem cells
    Tan SL, Ahmad TS, Selvaratnam L, Kamarul T
    J Anat, 2013 Apr;222(4):437-50.
    PMID: 23510053 DOI: 10.1111/joa.12032
    Mesenchymal stem cells (MSCs) are recognized by their plastic adherent ability, fibroblastic-like appearance, expression of specific surface protein markers, and are defined by their ability to undergo multi-lineage differentiation. Although rabbit bone marrow-derived MSCs (rbMSCs) have been used extensively in previous studies especially in translational research, these cells have neither been defined morphologically and ultrastructurally, nor been compared with their counterparts in humans in their multi-lineage differentiation ability. A study was therefore conducted to define the morphology, surface marker proteins, ultrastructure and multi-lineage differentiation ability of rbMSCs. Herein, the primary rbMSC cultures of three adult New Zealand white rabbits (at least 4 months old) were used for three independent experiments. rbMSCs were isolated using the gradient-centrifugation method, an established technique for human MSCs (hMSCs) isolation. Cells were characterized by phase contrast microscopy observation, transmission electron microscopy analysis, reverse transcriptase-polymerase chain reaction (PCR) analysis, immunocytochemistry staining, flow cytometry, alamarBlue(®) assay, histological staining and quantitative (q)PCR analysis. The isolated plastic adherent cells were in fibroblastic spindle-shape and possessed eccentric, irregular-shaped nuclei as well as rich inner cytoplasmic zones similar to that of hMSCs. The rbMSCs expressed CD29, CD44, CD73, CD81, CD90 and CD166, but were negative (or dim positive) for CD34, CD45, CD117 and HLD-DR. Despite having similar morphology and phenotypic expression, rbMSCs possessed significantly larger cell size but had a lower proliferation rate as compared with hMSCs. Using established protocols to differentiate hMSCs, rbMSCs underwent osteogenic, adipogenic and chondrogenic differentiation. Interestingly, differentiated rbMSCs demonstrated higher levels of osteogenic (Runx2) and chondrogenic (Sox9) gene expressions than that of hMSCs (P  0.05). rbMSCs possess similar morphological characteristics to hMSCs, but have a higher potential for osteogenic and chondrogenic differentiation, despite having a lower cell proliferation rate than hMSCs. The characteristics reported here may be used as a comprehensive set of criteria to define or characterize rbMSCs.
    Matched MeSH terms: Flow Cytometry
  11. Fulltext Primary plasma cell leukaemia in a 39-year-old man
    Kasinathan G
    BMJ Case Rep, 2020 Jul 23;13(7).
    PMID: 32709663 DOI: 10.1136/bcr-2020-235543
    Plasma cell leukaemia (PCL) is an aggressive haematological malignancy which is classified into primary (pPCL) and secondary PCL. A 39-year-old Indian man presented to the Department of Hematology with a 2-week history of fever and lethargy. Clinically, he was pale and febrile. Haemogram revealed bicytopenia with leucocytosis. The peripheral blood film portrayed rouleax formation with 45% of circulating plasma cells. Serum protein electrophoresis and immunofixation revealed IgG lambda paraproteinaemia of 48 g/L. Bone marrow aspirate, flow cytometry and trephine were consistent with IgG lambda pPCL. He was treated with six cycles of bortezomib, thalidomide and dexamethasone combination chemotherapy followed by high-dose melphalan conditioning and autologous stem cell transplant. Currently, he is in complete remission for the past 18 months and is on oral lenalidomide maintenance therapy. Prognosis is often dismal in pPCL with the median overall survival below 1 year if treatment is delayed.
    Matched MeSH terms: Flow Cytometry
  12. Fulltext Gallic acid induced apoptotic events in HCT-15 colon cancer cells
    Subramanian AP, Jaganathan SK, Mandal M, Supriyanto E, Muhamad II
    World J Gastroenterol, 2016 Apr 21;22(15):3952-61.
    PMID: 27099438 DOI: 10.3748/wjg.v22.i15.3952
    AIM: To investigate the inhibitory action of diet-derived phenolic compound gallic acid (GA) against HCT-15 colon cancer cells.
    METHODS: The antiproliferative effect of GA against colon cancer cells was determined by performing thiazolyl blue tetrazolium bromide (MTT) assay. The colony forming ability of GA treated colon cancer cells was evaluated using the colony forming assay. The cell cycle changes induced by GA in HCT-15 cells were analyzed by propidium iodide staining. Levels of reactive oxygen species (ROS) and mitochondrial membrane potential of HCT-15 exposed to GA was assessed using 2',7'-dichlorfluorescein-diacetate and rhodamine-123 respectively, with the help of flow cytometry. Morphological changes caused by GA treatment in the colon cancer cells were identified by scanning electron microscope and photomicrograph examination. Apoptosis was confirmed using flow cytometric analysis of GA treated HCT-15 cells after staining with Yo-Pro-1.
    RESULTS: MTT assay results illustrated that GA has an inhibitory effect on HCT-15 cells with IC50 value of 740 μmol/L. A time-dependent inhibition of colony formation was evident with GA treatment. Cell cycle arrest was evident from the accumulation of GA treated HCT-15 cells at sub-G1 phase (0.98 ± 1.03 vs 58.01 ± 2.05) with increasing exposure time. Flow cytometric analysis of GA treated HCT-15 cells depicted early events associated with apoptosis like lipid layer breakage and fall in mitochondrial membrane potential apart from an increase in the generation of ROS which were in a time dependent manner. SEM and photomicrograph images of the GA-treated cells displayed membrane blebbing and cell shrinking characteristics of apoptosis. Further apoptosis confirmation by Yo-Pro-1 staining also showed the time-dependent increase of apoptotic cells after treatment.
    CONCLUSION: These results show that GA induced ROS dependent apoptosis and inhibited the growth of colon cancer cells.
    KEYWORDS: Apoptosis; Cell cycle; Colon cancer; Gallic acid; Lipid layer break; Reactive oxygen species
    Matched MeSH terms: Flow Cytometry
  13. Fulltext Persistent Newcastle disease virus infection in bladder cancer cells is associated with putative pro-survival and anti-viral transcriptomic changes
    Chan LC, Kalyanasundram J, Leong SW, Masarudin MJ, Veerakumarasivam A, Yusoff K, et al.
    BMC Cancer, 2021 May 27;21(1):625.
    PMID: 34044804 DOI: 10.1186/s12885-021-08345-y
    BACKGROUND: Newcastle disease virus (NDV) is an oncolytic virus with excellent selectivity against cancer cells, both in vitro and in vivo. Unfortunately, prolonged in vitro NDV infection results in the development of persistent infection in the cancer cells which are then able to resist NDV-mediated oncolysis. However, the mechanism of persistency of infection remains poorly understood.

    METHODS: In this study, we established persistently NDV-infected EJ28 bladder cancer cells, designated as EJ28P. Global transcriptomic analysis was subsequently carried out by microarray analysis. Differentially expressed genes (DEGs) between EJ28 and EJ28P cells identified by the edgeR program were further analysed by Gene Set Enrichment Analysis (GSEA) and Ingenuity Pathway Analysis (IPA) analyses. In addition, the microarray data were validated by RT-qPCR.

    RESULTS: Persistently NDV-infected EJ28 bladder cancer cells were successfully established and confirmed by flow cytometry. Microarray analysis identified a total of 368 genes as differentially expressed in EJ28P cells when compared to the non-infected EJ28 cells. GSEA revealed that the Wnt/β-catenin and KRAS signalling pathways were upregulated while the TGF-β signalling pathway was downregulated. Findings from this study suggest that the upregulation of genes that are associated with cell growth, pro-survival, and anti-apoptosis may explain the survivability of EJ28P cells and the development of persistent infection of NDV.

    CONCLUSIONS: This study provides insights into the transcriptomic changes that occur and the specific signalling pathways that are potentially involved in the development and maintenance of NDV persistency of infection in bladder cancer cells. These findings warrant further investigation and is crucial towards the development of effective NDV oncolytic therapy against cancer.

    Matched MeSH terms: Flow Cytometry
  14. Fulltext Assessing the Immunomodulatory Activity of Ethanol Extract of Sambucus javanica Berries and Leaves in Chloramphenicol-Induced Aplastic Anemia Mouse Model
    Putra WE, Rifa'i M
    Trop Life Sci Res, 2020 Jul;31(2):175-185.
    PMID: 32922674 DOI: 10.21315/tlsr2020.31.2.9
    Aplastic anemia, life-threatened disease, is a hematologic disorder characterised by bone marrow hypoplasia. Multiple modalities such as bone marrow transplantation and immunosuppression treatment have been proposed to ameliorate this entity, however it remains ineffective. Sambucus, a group of herb plants, possesses a broad spectrum of medicinal properties such as antioxidant, insulin-like activity, anticancer and antiviral. However, the study about its activity toward aplastic anemia incidence is based on limited data. Thus, the research aim of this study was to evaluate the immunomodulatory activities of Sambucus javanica in chloramphenicol-induced anemia aplastic mouse model. In this present study, BALB/c mice were administrated with chloramphenicol (CMP) to induce aplastic anemia then followed by S. javanica extracts treatment. Additionally, cellular and molecular aspects were evaluated by flow cytometry and Hematoxylin-Eosin staining. Further analysis showed that S. javanica extracts could promote the population number of regulatory T-cells and naive cytotoxic T-cells. Moreover, those extract also reduced the inflammation and necrotic incidence in CMP-induced mouse aplastic anemia model. Together, these results suggest that S. javanica has therapeutically effect to aplastic anemia by altering the immune system as an immunomodulatory agent.
    Matched MeSH terms: Flow Cytometry
  15. Frequent loss of CD10 expression in follicular lymphoma with leukaemic presentation
    Chen SW, Chang ST, Hsieh YC, Kuo CC, Wu HC, Feng YH, et al.
    Malays J Pathol, 2020 Aug;42(2):237-243.
    PMID: 32860376
    INTRODUCTION: Follicular lymphoma (FL) is usually a nodal lymphoma expressing CD10, rarely with leukaemic presentation (FL-LP).

    MATERIALS AND METHODS: We searched for FL-LP in our institution from 2000 to 2018 and characterised the neoplastic cells by flow cytometry, immunohistochemistry and fluorescence in situ hybridization. Thirteen (6.1%) of 212 FL cases were FL-LP, all de novo neoplasms. The leukaemic cells were small in 12 cases and large in one. All had concurrent FL, mostly (92%; 12/13) low-grade. The single case with large leukaemic cells had a concurrent primary splenic low-grade FL and a double-hit large B-cell lymphoma in the marrow.

    RESULTS: CD10 was expressed in the leukaemic cells in 38% (5/13) cases by flow cytometry and in 77% (10/13) cases in tumours (p= 0.0471). IGH/BCL2 reciprocal translocation was identified in 85% (11/13) cases. Most patients were treated with chemotherapy. In a median follow-up time of 36 months, nine patients were in complete remission. The 2- and 5-year survival rates were at 100% and 83%, respectively. In this study, we characterised a series of de novo FL-LP in Taiwan. All patients had concurrent nodal and/or tissue tumours, which might suggest that these patients seek medical help too late.

    CONCLUSION: The lower CD10 expression rate by flow cytometry than by immunohistochemistry might be due to different epitopes for these assays. Alternatively, loss of CD10 expression might play a role in the pathogenesis of leukaemic change. The clinical course of FL-LP could be aggressive, but a significant proportion of the patients obtained complete remission with chemotherapy.

    Matched MeSH terms: Flow Cytometry
  16. The acetone crude extract of Quercus infectoria (Olivier) galls alters pH of the digestive vacuole of the malaria parasite, Plasmodium falciparum
    Trop Biomed, 2021 Jun 01;38(2):40-47.
    PMID: 33973571 DOI: 10.47665/tb.38.2.035
    The reduced efficacy of the mainstay antimalarial drugs due to the widespread of drugresistant Plasmodium falciparum has necessitated efforts to discover new antimalarial drugs with new targets. Quercus infectoria (Olivier) has long been used to treat various ailments including fever. The acetone extract of the plant galls has recently been reported to have a promising antimalarial activity in vitro. This study was aimed to determine the effect of the Q. infectoria gall acetone crude extract on pH of the digestive vacuole of Plasmodium falciparum. A ratiometric fluorescent probe, fluorescein isothiocyanate-dextran (FITC-dextran) was used to facilitate a quantitative measurement of the digestive vacuole pH by flow cytometry. Mid trophozoite stage malaria parasites grown in resealed erythrocytes containing FITC-dextran were treated with different concentrations of the acetone extract based on the 50% inhibitory concentration (IC50). Saponin-permeabilized parasites were analyzed to obtain the ratio of green/yellow fluorescence intensity (Rgy) plotted as a function of pH in a pH calibration curve of FITC-dextran. Based on the pH calibration curve, the pH of the digestive vacuole of the acetone extract-treated parasites was significantly altered (pH values ranged from 6.35- 6.71) in a concentration-dependent manner compared to the untreated parasites (pH = 5.32) (p < 0.001). This study provides a valuable insight into the potential of the Q. infectoria galls as a promising antimalarial candidate with a novel mechanism of action.
    Matched MeSH terms: Flow Cytometry
  17. Fulltext Monobenzyltin Complex C1 Induces Apoptosis in MCF-7 Breast Cancer Cells through the Intrinsic Signaling Pathway and through the Targeting of MCF-7-Derived Breast Cancer Stem Cells via the Wnt/β-Catenin Signaling Pathway
    Fani S, Dehghan F, Karimian H, Mun Lo K, Ebrahimi Nigjeh S, Swee Keong Y, et al.
    PLoS One, 2016 Aug 16;11(8):e0160836.
    PMID: 27529753 DOI: 10.1371/journal.pone.0160836
    Monobenzyltin Schiff base complex, [N-(3,5-dichloro-2-oxidobenzylidene)-4-chlorobenzyhydrazidato](o-methylbenzyl)aquatin(IV) chloride, C1, is an organotin non-platinum metal-based agent. The present study was conducted to investigate its effects on MCF-7 cells with respect to the induction of apoptosis and its inhibitory effect against MCF-7 breast cancer stem cells. As determined in a previous study, compound C1 revealed strong antiproliferative activity on MCF-7 cells with an IC50 value of 2.5 μg/mL. Annexin V/propidium iodide staining coupled with flow cytometry indicated the induction of apoptosis in treated cells. Compound C1 induced apoptosis in MCF-7 cells and was mediated through the intrinsic pathway with a reduction in mitochondrial membrane potential and mitochondrial cytochrome c release to cytosol. Complex C1 activated caspase 9 as a result of cytochrome c release. Subsequently, western blot and real time PCR revealed a significant increase in Bax and Bad expression and a significant decrease in the expression levels of Bcl2 and HSP70. Furthermore, a flow cytometric analysis showed that treatment with compound C1 caused a significant arrest of MCF-7 cells in G0/G1 phase. The inhibitory analysis of compound C1 against derived MCF-7 stem cells showed a significant reduction in the aldehyde dehydrogenase-positive cell population and a significant reduction in the population of MCF-7 cancer stem cells in primary, secondary, and tertiary mammospheres. Moreover, treatment with C1 down-regulated the Wnt/β-catenin self-renewal pathway. These findings indicate that complex C1 is a suppressive agent of MCF-7 cells that functions through the induction of apoptosis, cell cycle arrest, and the targeting of MCF-7-derived cancer stem cells. This work may lead to a better treatment strategy for the reduction of breast cancer recurrence.
    Matched MeSH terms: Flow Cytometry
  18. Anti-Proliferative Effects of Dendrophthoe pentandra Methanol Extract on BCR/ABL-Positive and Imatinib-Resistant Leukemia Cell Lines
    Zamani A, Mat Jusoh SA, Al-Jamal HA, Sul'ain MD, Johan MF
    Asian Pac J Cancer Prev, 2016 11 01;17(11):4857-4861.
    PMID: 28030911
    Background: Imatinib mesylate, a tyrosine kinase inhibitor specifically targeting the BCR/ABL fusion protein, induces hematological remission in patients with chronic myeloid leukemia (CML). However, the majority of CML patients treated with imatinib develop resistance with prolonged therapy. Dendrophthoe pentandra (L.) Miq. is a Malaysian mistletoe species that has been used as a traditional treatment for several ailments such as smallpox, ulcers, and cancers. Methods: We developed a resistant cell line (designated as K562R) by long-term co-culture of a BCR/ ABL positive CML cell line, K562, with imatinib mesylate. We then investigated the anti-proliferative effects of D. pentandra methanol extract on parental K562 and resistant K562R cells. Trypan blue exclusion assays were performed to determine the IC50 concentration; apoptosis and cell cycle analysis were conducted by flow cytometry. Results: D. pentandra extract had greater anti-proliferative effects towards K562R (IC50= 192 μg/mL) compared to K562 (500 μg/ mL) cells. Upon treatment with D. pentandra extract at the IC50. concentration: K562 but not K562R demonstrated increase in apoptosis and cell cycle arrest in the G2/M phase. Conclusion: D. pentandra methanol extract exerts potent anti-proliferative effect on BCR/ABL positive K562 cells.
    Matched MeSH terms: Flow Cytometry
  19. Fulltext Minimal residual disease status in childhood acute lymphoblastic leukaemias by flow cytometry and their clinical and haematological features
    Azma, R.Z., Zarina, A.L., Hamidah, A., Cheong, SK, Jamal, R., Hamidah, N.H.
    Medicine & Health, 2010;5(1):22-33.
    MyJurnal
    Residual disease in patients with acute leukaemia indicates unfavorable prognosis. The evaluation of remission using flow cytometry allows a better estimation of minimal residual disease (MRD) after induction chemotherapy in childhood acute lymphoblastic leukaemia (ALL) cases. Patients in morphological marrow remission with presence of blast cells of less than 5%, may still have up to 1010 leukaemic cells. However with flow cytometric analysis, lower levels of the residual leukaemic cells (1 in 104 cells) can be detected and it can be used as a tool to predict relapse. This study compared the presenting clinical and haematological features of children with ALL and their residual disease status determined by flow cytometry. Analysis of their MRD status following remission-induction chemotherapy were done at day-28, week-12 and week-20. The cases were also followed up to five years, to determine their survival status. Their residual disease status by flow cytometric immunophenotyping was also compared with their bone marrow findings morphologically. Thirty-eight cases of precursor B-ALL in pediatric patients from UKM Medical Centre (UKMMC) were analyzed. There was no significant correlation between demographic, clinical and haematological features with MRD status at day-28. However, there was a significant correlation between MRD status by flow cytometry and by morphological marrow examination at week-12. Three cases showed persistent MRD findings until week-20 where two of the cases relapsed and died subsequently. Twenty four patients were still alive after five years of follow up.
    Matched MeSH terms: Flow Cytometry
  20. Fulltext Aggressive variant large granular lymphocytic leukaemia: a case report
    Sabariah, M. N., Zainina, S., Faridah, I., Leong, C. F.
    Malaysian Journal of Medicine and Health Sciences, 2011;7(1):57-60.
    MyJurnal
    Clonal disorders of LGL may either be CD3+ CD56- or CD3- CD56+ phenotype and these have been designated as T-cell leukaemia (T-LGL) or natural killer cell (NK)-LGL leukaemia respectively. Clonality is usually demonstrated by clonal rearrangement of T-cell receptor gene rearrangement or identified by flowcytometry analysis. Most patients with T-LGL will have an indolent course. In this report we described an aggressiveness of disease in a patient with clonal CD3+ LGL leukaemia whose cells also co-expressed CD56 diagnosed by flowcytometry. The patient responded well to interrupt ALL standard risk protocol however succumbed to her disease while waiting for upfront stem cell transplant. This case highlights on both the classical laboratory findings of rare entity of disease as well as a review of the literature pertaining particularly on its management.
    Matched MeSH terms: Flow Cytometry
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