Displaying all 16 publications

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  1. Tsai HJ, Liou B, Li MC
    Malays J Pathol, 2013 Dec;35(2):177-80.
    PMID: 24362481
    Basaloid squamous cell carcinoma (BSCC) of the uterine cervix is a rare malignancy of the female genital tract with a poorer clinical outcome than SCC of the uterine cervix. We report a case of BSCC of the uterine cervix developing rapidly in a young adult Taiwanese. A 35-year-old woman, Para 2, visited the emergency room with severe dizziness, palpitations and sudden excessive vaginal bleeding with hemoglobin of 3.6 g/dl. She had been well and healthy but intermittent vaginal spotting developed for around 6 months previously and was treated as abnormal uterine bleeding by ob-gyn practitioners. She had a repeat cesarean operation 16 months prior to this episode and the last Pap smear showed reactive change 12 months ago at our hospital. On examination, she had an ulcerated, necrotic, and punched-out lesion of 5 cm of the cervix. A cervical biopsy revealed poorly differentiated typical BSCC. Abdominal/pelvic computerized tomography and whole body positron emission tomography confirmed FIGO staging IB2. She responded well to concurrent chemoradiotherapy. Follow-up for the patient is ongoing. This is a rapid developing BSCC of the uterine cervix, although we cannot actually ascertain when it started and how rapidly it progressed.
  2. Nordin N, Nathan S, Li M, Mason JO
    Med. J. Malaysia, 2008 Jul;63 Suppl A:59-60.
    PMID: 19024983
    Obtaining pure population of neural cells from embryonic stem (ES) cells remains a challenge as little is known about the genes that govern embryonic stem cell differentiation. Using mouse ES cells, we aim to uncover the mechanisms that regulate neural differentiation of ES cells by focusing on roles played by Wnt family genes. Combining two techniques, Cre/loxP-based genetic recombination and ligand-dependent activation of Cre, we have generated transgenic ES cell lines that allow for the temporal control of expression and activity of Wnt gene (Wnt1-Ha) and Wnt antagonist (Dkk1). The ability of these cell lines in inducing the expression of transgene in undifferentiated ES cells and, more importantly, in differentiated derivatives of ES cells in vitro is evaluated.
  3. Lee KT, Li MK, Cheng WS, Foo KT
    Br J Urol, 1998 May;81(5):705-8.
    PMID: 9634045
    OBJECTIVE: To evaluate the impact of the modified ileal neobladder reconstruction on lifestyle, voiding habits and functional outcome in Asian patients.

    PATIENTS AND METHODS: Twenty-seven Asian patients (25 men and two women, mean age 59 years, range 41-76) underwent modified ileal neobladder reconstruction after radical cystectomy for carcinoma of the bladder. The mean (range) follow-up was 21 (3-75) months. All patients were evaluated retrospectively using case notes, reviews, interviews and voiding charts; 18 patients underwent urodynamic studies.

    RESULT: Twenty-five patients (93%) achieved diurnal and 23 (85%) nocturnal continence within 6 months. Of the 19 patients who were in employment before surgery, 15 continued to be economically active afterward; 26 patients (96%) reported no change in their daily living activities. Of 16 men who reported being potent pre-operatively only four retained some residual erectile function. Twenty-three patients were interviewed about their voiding habits and satisfaction with the outcome of surgery. Fourteen patients had no sensation of reservoir fullness and of the 21 men, 13 had to squat or sit to void effectively. The mean (range) voiding frequency was 5 (4-8) during the day and 2 (0-4) during sleep. Twenty-two patients were satisfied with the overall outcome.

    CONCLUSIONS: The modified ileal bladder provides a high urinary continence rate with minimal changes in daily living activities and occupational status. The functional outcome was very satisfactory and accepted well, despite some changes in reservoir sensation, voiding posture and erectile function. The method is a viable option for reconstruction after cystectomy in Asian patients.

  4. Tan X, Li M, Arsad N, Wen X, Lu H
    Rev Sci Instrum, 2018 Mar;89(3):035005.
    PMID: 29604764 DOI: 10.1063/1.5017639
    Hydrogen is a kind of promising clean energy resource with a wide application prospect, which will, however, cause a serious security issue upon the leakage of hydrogen gas. The measurement of its concentration is of great significance. In a traditional approach of ultrasonic hydrogen sensing, a temperature drift of 0.1 °C results in a concentration error of about 250 ppm, which is intolerable for trace amount of gas sensing. In order to eliminate the influence brought by temperature drift, we propose a feasible approach named as linear compensation algorithm, which utilizes the linear relationship between the pulse count and temperature to compensate for the pulse count error (ΔN) caused by temperature drift. Experimental results demonstrate that our proposed approach is capable of improving the measurement accuracy and can easily detect sub-100 ppm of hydrogen concentration under variable temperature conditions.
  5. Jeevaratnam K, Salvage SC, Li M, Huang CL
    Ann. N. Y. Acad. Sci., 2018 12;1433(1):18-28.
    PMID: 29846007 DOI: 10.1111/nyas.13861
    Alterations in cellular levels of the second messenger 3',5'-cyclic adenosine monophosphate ([cAMP]i ) regulate a wide range of physiologically important cellular signaling processes in numerous cell types. Osteoclasts are terminally differentiated, multinucleated cells specialized for bone resorption. Their systemic regulator, calcitonin, triggers morphometrically and pharmacologically distinct retraction (R) and quiescence (Q) effects on cell-spread area and protrusion-retraction motility, respectively, paralleling its inhibition of bone resorption. Q effects were reproduced by cholera toxin-mediated Gs -protein activation known to increase [cAMP]i , unaccompanied by the [Ca2+ ]i changes contrastingly associated with R effects. We explore a hypothesis implicating cAMP signaling involving guanine nucleotide-exchange activation of the small GTPase Ras-proximate-1 (Rap1) by exchange proteins directly activated by cAMP (Epac). Rap1 activates integrin clustering, cell adhesion to bone matrix, associated cytoskeletal modifications and signaling processes, and transmembrane transduction functions. Epac activation enhanced, whereas Epac inhibition or shRNA-mediated knockdown compromised, the appearance of markers for osteoclast differentiation and motility following stimulation by receptor activator of nuclear factor kappa-Β ligand (RANKL). Deficiencies in talin and Rap1 compromised in vivo bone resorption, producing osteopetrotic phenotypes in genetically modified murine models. Translational implications of an Epac-Rap1 signaling hypothesis in relationship to N-bisphosphonate actions on prenylation and membrane localization of small GTPases are discussed.
  6. Li MW, Lin RQ, Chen HH, Sani RA, Song HQ, Zhu XQ
    Mol. Cell. Probes, 2007 Oct-Dec;21(5-6):349-54.
    PMID: 17532185
    Based on the sequences of the internal transcribed spacers (ITS-1 and ITS-2) of nuclear ribosomal DNA (rDNA) of Toxocara canis, Toxocara cati, Toxocara malaysiensis and Toxascaris leonina, specific forward primers were designed in the ITS-1 or ITS-2 for each of the four ascaridoid species of dogs and cats. These primers were used individually together with a conserved primer in the large subunit of rDNA to amplify partial ITS-1 and/or ITS-2 of rDNA from 107 DNA samples from ascaridoids from dogs and cats in China, Australia, Malaysia, England and the Netherlands. This approach allowed their specific identification, with no amplicons being amplified from heterogeneous DNA samples, and sequencing confirmed the identity of the sequences amplified. The minimum amounts of DNA detectable using the PCR assays were 0.13-0.54ng. These PCR assays should provide useful tools for the diagnosis and molecular epidemiological investigations of toxocariasis in humans and animals.
  7. Zhan SZ, Li M, Zheng J, Wang QJ, Ng SW, Li D
    Inorg Chem, 2017 Nov 06;56(21):13446-13455.
    PMID: 29023107 DOI: 10.1021/acs.inorgchem.7b02144
    Six daughter complexes based on two-dimensional (2-D) luminescent Cu4I4-Cu3Pz3(Pz = pyrazolate) coordination networks, which exhibit an uncommon Cu4I4L3L' (L = pyridine; L' = acetonitrile, pyridine, pyrazine, 1,4-diazabicyclo[2.2.2]octane, triphenylphosphine, none) local configuration, were prepared through a postsynthetic modification method starting from a parent complex (L' = NH3). This work has successfully implemented the single-site substitution of Cu4I4-based coordination frameworks, which have rarely been reported for isolated Cu4I4-type compounds, by taking advantage of the solvent-assisted ligand substitution strategy recently developed in metal-organic framework (MOF) chemistry. Such a procedure not only resulted in the variation of local geometry in the Cu4I4units but also led to interlayer network displacement and entanglement. Particularly, an interesting topological transformation (from 2-D to 2-D → 3-D interpenetration) occurred when linear bidentate linkers (e.g., pyrazine and 1,4-diazabicyclo[2.2.2]octane) are inserted between the 2-D layers. Moreover, the variation in the L' sites can effectively tune the emission colors, ranging from green to orange (λemmax540-605 nm at room temperature). The photoluminescence origins are tentatively assigned to be a mixture of3MLCT and3XLCT, different from that of the well-studied isolated Cu4I4-type complexes.
  8. Xu LL, Zhang HF, Li M, Ng SW, Feng JH, Mao JG, et al.
    J. Am. Chem. Soc., 2018 09 19;140(37):11569-11572.
    PMID: 30141923 DOI: 10.1021/jacs.8b06725
    Chiroptical activity is observed from an achiral adenine-containing metal-organic framework (MOF) named ZnFDCA. Such a seemingly counterintuitive phenomenon can, in fact, be predicted by the intrinsic crystal symmetry of 4̅2 m point group. Although theoretically allowed, examples of optically active achiral crystals are extremely rare. ZnFDCA is the first reported achiral MOF showing optical activity, as demonstrated by a pair of circular dichroism signals with opposite signs and enhanced intensity. Moreover, simply through adding an amino substituent to adenine, the chiroptical activity, as well as nonlinear optical activity, of the analogous MOF, namely ZnFDCA-NH2, disappears due to diverse packing pattern giving rise to centrosymmetric crystal symmetry.
  9. Sun RW, Zhang M, Li D, Zhang ZF, Cai H, Li M, et al.
    Chemistry, 2015 Dec 14;21(51):18534-8.
    PMID: 26459298 DOI: 10.1002/chem.201503656
    A dinuclear gold(I) pyrrolidinedithiocarbamato complex (1) with a bidentate carbene ligand has been constructed and shows potent in vitro cytotoxic activities towards cisplatin-resistant ovarian cancer cells A2780cis. Its rigid scaffold enables a zinc(II)-based metal-organic framework (Zn-MOF) to be used as a carrier in facilitating the uptake and release of 1 in solutions. Instead of using a conventional dialysis approach for the drug-release testing, in this study, a set of transwell assay-based experiments have been designed and employed to examine the cytotoxic and antimigratory activities of 1@Zn-MOF towards A2780cis.
  10. Mak WY, Mak OS, Lee CK, Tang W, Leung WK, Wong MTL, et al.
    J Crohns Colitis, 2018 Nov 28;12(12):1392-1398.
    PMID: 30165543 DOI: 10.1093/ecco-jcc/jjy120
    Background: The presence of perianal fistulas in Crohn's disease [CD] denotes increased disease aggressiveness. We studied the epidemiology and clinical outcomes of perianal CD [PCD] using the Hong Kong territory-wide IBD Registry [HKIBDR].

    Methods: Consecutive patients with PCD were identified from the HKIBDR, and disease characteristics, treatments, and outcomes were analysed. The risks for medical and surgical therapies were assessed using Kaplan-Meier analysis.

    Results: Among 981 patients with CD with 10530 patient-years of follow-up, 283 [28.8%] had perianal involvement, of which 120 [42.4%] were as first presentation. The mean age at diagnosis of PCD was 29.1 years, and 78.8% were male. The median follow-up duration was 106 months (interquartile range [IQR]: 65-161 months]. Perianal fistula [84.8%] and perianal abscess [52.7%] were the two commonest forms. Male, younger age at diagnosis of CD, and penetrating phenotypes were associated with development of PCD in multivariate analysis. Of 242 patients with fistulizing PCD, 70 [29.2%] required ≥5 courses of antibiotics, and 98 [40.5%] had ≥2 surgical procedures. Nine patients required defunctioning surgery and 4 required proctectomy. Eighty-four patients [34.7%] received biologics. Cumulative probabilities for use of biologics were 4.7%, 5.8%, and 8.6% at 12 months, 36 months, and 96 months, respectively, while the probabilities for surgery were 67.2%, 71.6%, and 77.7%, respectively. Five mortalities were recorded, including 2 cases of anal cancer, 2 CD-related complications, and one case of pneumonia.

    Conclusion: Over 40% of CD patients presented with perianal disease at diagnosis. Patients with PCD had poor outcome, with young age of onset, multiple antibiotic use, and repeated surgery.

  11. Tsubota K, Yokoi N, Watanabe H, Dogru M, Kojima T, Yamada M, et al.
    Eye Contact Lens, 2019 Aug 13.
    PMID: 31425351 DOI: 10.1097/ICL.0000000000000643
    The 2017 consensus report of the Asia Dry Eye Society (ADES) on the definition and diagnosis of dry eyes described dry eye disease as "Dry eye is a multifactorial disease characterized by unstable tear film causing a variety of symptoms and/or visual impairment, potentially accompanied by ocular surface damage." The report emphasized the instability of tear film and the importance of visual dysfunction in association with dry eyes, highlighting the importance of the evaluation of tear film stability. This report also discussed the concept of tear film-oriented therapy, which stemmed from the definition, and which is centered on provision of insufficient components in each tear film layer and ocular surface epithelium. The current ADES report proposes a simple classification of dry eyes based on the concept of tear film-oriented diagnosis and suggests that there are three types of dry eye: aqueous-deficient, decreased wettability, and increased evaporation. It is suggested that these three types respectively coincide with the problems of each layer: aqueous, membrane-associated mucins, and lipid/secretory mucin. Although each component cannot be quantitatively evaluated with the current technology, a practical diagnosis based on the patterns of fluorescein breakup is recommended. The Asia Dry Eye Society classification report suggests that for a practical use of the definition, diagnostic criteria and classification system should be integrated and be simple to use. The classification system proposed by ADES is a straightforward tool and simple to use, only through use of fluorescein, which is available even to non-dry eye specialists, and which is believed to contribute to an effective diagnosis and treatment of dry eyes.
  12. Sun P, Hu SB, Cheng X, Li M, Guo B, Song ZF, et al.
    Hernia, 2015 Apr;19 Suppl 1:S157-65.
    PMID: 26518794 DOI: 10.1007/BF03355344
  13. Maaroufi A, Vince A, Himatt SM, Mohamed R, Fung J, Opare-Sem O, et al.
    J. Viral Hepat., 2017 10;24 Suppl 2:8-24.
    PMID: 29105285 DOI: 10.1111/jvh.12762
    Due to the introduction of newer, more efficacious treatment options, there is a pressing need for policy makers and public health officials to develop or adapt national hepatitis C virus (HCV) control strategies to the changing epidemiological landscape. To do so, detailed, country-specific data are needed to characterize the burden of chronic HCV infection. In this study of 17 countries, a literature review of published and unpublished data on HCV prevalence, viraemia, genotype, age and gender distribution, liver transplants and diagnosis and treatment rates was conducted, and inputs were validated by expert consensus in each country. Viraemic prevalence in this study ranged from 0.2% in Hong Kong to 2.4% in Taiwan, while the largest viraemic populations were in Nigeria (2 597 000 cases) and Taiwan (569 000 cases). Diagnosis, treatment and liver transplant rates varied widely across the countries included in this analysis, as did the availability of reliable data. Addressing data gaps will be critical for the development of future strategies to manage and minimize the disease burden of hepatitis C.
  14. Chen DS, Hamoudi W, Mustapha B, Layden J, Nersesov A, Reic T, et al.
    J. Viral Hepat., 2017 10;24 Suppl 2:44-63.
    PMID: 29105286 DOI: 10.1111/jvh.12759
    The hepatitis C virus (HCV) epidemic was forecasted through 2030 for 17 countries in Africa, Asia, Europe, Latin America and the Middle East, and interventions for achieving the Global Health Sector Strategy on viral hepatitis targets-"WHO Targets" (65% reduction in HCV-related deaths, 90% reduction in new infections and 90% of infections diagnosed by 2030) were considered. Scaling up treatment and diagnosis rates over time would be required to achieve these targets in all but one country, even with the introduction of high SVR therapies. The scenarios developed to achieve the WHO Targets in all countries studied assumed the implementation of national policies to prevent new infections and to diagnose current infections through screening.
  15. Chan HLY, Chen CJ, Omede O, Al Qamish J, Al Naamani K, Bane A, et al.
    J. Viral Hepat., 2017 10;24 Suppl 2:25-43.
    PMID: 29105283 DOI: 10.1111/jvh.12760
    Factors influencing the morbidity and mortality associated with viremic hepatitis C virus (HCV) infection change over time and place, making it difficult to compare reported estimates. Models were developed for 17 countries (Bahrain, Bulgaria, Cameroon, Colombia, Croatia, Dominican Republic, Ethiopia, Ghana, Hong Kong, Jordan, Kazakhstan, Malaysia, Morocco, Nigeria, Qatar and Taiwan) to quantify and characterize the viremic population as well as forecast the changes in the infected population and the corresponding disease burden from 2015 to 2030. Model inputs were agreed upon through expert consensus, and a standardized methodology was followed to allow for comparison across countries. The viremic prevalence is expected to remain constant or decline in all but four countries (Ethiopia, Ghana, Jordan and Oman); however, HCV-related morbidity and mortality will increase in all countries except Qatar and Taiwan. In Qatar, the high-treatment rate will contribute to a reduction in total cases and HCV-related morbidity by 2030. In the remaining countries, however, the current treatment paradigm will be insufficient to achieve large reductions in HCV-related morbidity and mortality.
  16. Klionsky DJ, Abdelmohsen K, Abe A, Abedin MJ, Abeliovich H, Acevedo Arozena A, et al.
    Autophagy, 2016;12(1):1-222.
    PMID: 26799652 DOI: 10.1080/15548627.2015.1100356
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