Time filter

Source Type

Wang T.-J.,Taipei Medical University Hospital
Cornea | Year: 2016

ABSTRACT:: When corneal endothelial cells (CECs) are diseased or injured, corneal endothelium can be surgically removed and tissue from a deceased donor can replace the original endothelium. Recent major innovations in corneal endothelial transplantation include replacement of diseased corneal endothelium with a thin lamellar posterior donor comprising a tissue-engineered endothelium carried or cultured on a thin substratum with an organized monolayer of cells. Repairing CECs is challenging because they have restricted proliferative ability in vivo. CECs can be cultivated in vitro and seeded successfully onto natural tissue materials or synthetic polymeric materials as grafts for transplantation. The optimal biomaterials for substrata of CEC growth are being investigated. Establishing a CEC culture system by tissue engineering might require multiple biomaterials to create a new scaffold that overcomes the disadvantages of single biomaterials. Chitosan and polycaprolactone are biodegradable biomaterials approved by the Food and Drug Administration that have superior biological, degradable, and mechanical properties for culturing substratum. We successfully hybridized chitosan and polycaprolactone into blended membranes, and demonstrated that CECs proliferated, developed normal morphology, and maintained their physiological phenotypes. The interaction between cells and biomaterials is important in tissue engineering of CECs. We are still optimizing culture methods for the maintenance and differentiation of CECs on biomaterials. Copyright © 2016 Wolters Kluwer Health, Inc. All rights reserved.

Chen Y.-H.,Taipei Medical University | Chen Y.-H.,Taipei Medical University Hospital | Lin H.-C.,Taipei Medical University
Stroke | Year: 2011

Background and Purpose-Previous studies have identified an array of morbidities following traumatic bran injury (TBI), including certain neurological disorders. However, no direct evidence has been reported on the link between TBI and stroke. This population-based study was designed to estimate the risk of stroke during a period of 5 years following a TBI, compared with individuals who did not suffer TBI during the same period. Methods-Data were obtained from the Longitudinal Health Insurance Database 2000 (LHID 2000). A total of 23 199 patients receiving ambulatory or hospitalization care with a diagnosis of TBI were included, together with 69 597 non-TBI patients as our comparison group, matched by sex, age, and year of index use of health care. Each individual was followed for 5 years to identify subsequent occurrence of stroke. Cox proportional hazard regressions were performed for analysis. RESULTS-: During the 3-month follow-up period, 675 strokes (2.91%) occurred in TBI patients and in 207 patients (0.30%) in the non-TBI comparison cohort. A diagnosis of TBI was independently associated with a 10.21 (95% CI, 8.71-11.96), 4.61 (95% CI, 4.16-5.11), and 2.32 (95% CI, 2.17-2.47) times greater risk of stroke during 3-month, 1-year, and 5-year follow-up, respectively, after adjusting for sociodemographic characteristics and selected comorbidities. The risk of intracerebral hemorrhage was more noticeable among patients with TBI compared with those without a TBI. Conclusions-This is the first report showing an increased risk of stroke among individuals who have sustained a TBI. We suggest a need for more intensive medical monitoring and health education following TBI, especially during the first few months and years. © 2011 American Heart Association, Inc.

Chao K.-C.,Academia Sinica, Taiwan | Yang H.-T.,Taipei Medical University Hospital | Chen M.-W.,National Taiwan University
Journal of Cellular and Molecular Medicine | Year: 2012

The purpose of this study was to investigate how human umbilical cord mesenchymal stem cells (HUMSCs) affect breast cancer tumourigenesis. To observe the influence of HUMSCs on tumourigenesis in vitro, we performed a co-culture of MDA MB-231 breast cancer cells with HUMSCs, and a result of HUMSCs on tumourigenesis in vivo was achieved by injection of HUMSCs into nonobese diabetic/severe combined immunodeficient mice following tumour establishment with MDA-MB231. During the co-culture, apoptosis of MDA-MB231 was noted, which was driven either by binding with HUMSC through direct cell-cell contact or by formation of a novel cell-in-cell phenomenon after internalization of HUMSC. Also, treatment with HUMSC injection was efficacious in both in situ and metastatic breast cancers in the animal models. Since HUMSCs were proved to efficaciously suppress breast cancer tumourigenesis both in vitro and in vivo, it is our expectation that treatment with HUMSCs can be a viable therapy for breast cancer in the near future. In addition, we share a new point of view on the role of HUMSCs in foetal development during pregnancy. © 2012 The Authors. Journal of Cellular and Molecular Medicine © 2012 Foundation for Cellular and Molecular Medicine/Blackwell Publishing Ltd.

Kuo Y.-C.,Taipei Medical University Hospital | Kuo H.-C.,Tzu Chi University
International Journal of Clinical Practice | Year: 2012

Aim: There is considerable overlap between symptoms of interstitial cystitis/painful bladder syndrome (IC/PBS) and bladder oversensitivity, thereby making it difficult to differentiate between the two based on symptoms alone. We investigated factors that could potentially be used to differentiate between IC/PBS and bladder oversensitivity in women. Materials and methods: Video-urodynamic study (VUDS) results in women with lower urinary tract symptoms (LUTS) were retrospectively analysed. Patients classified as having increased bladder sensation (IBS) were selected for analysis. A potassium chloride (KCl) test was performed and pain or urgency elicited was considered positive response. Cystoscopic hydrodistention demonstrating glomerulation was considered diagnosis of IC/PBS; otherwise bladder oversensitivity was diagnosed. LUTS, urodynamic variables and results of the KCl test were used to predict IC/PBS in these women. Results: A total of 405 women with IBS and 272 symptomatic controls with normal VUDS findings were included. Among 227 IBS patients undergoing KCl test, a positive result was found in 190 and a negative test result was found in 37. Characteristic glomerulation was noted in 170 patients, including 165 with a positive and five with a negative KCl test. We found that storage symptoms and pain had a positive predictive value of 45.3% for IC/PBS. When a CBC ≤ 350 ml was added the positive predictive value was 65% for IC/PBS. A combination of storage symptoms, a CBC a;circ 350 ml, a positive KCl test result with an increase of ≥ 2 on the visual analogue pain scale (VAS) provided 100% predictive of IC/PBS. Conclusion: A diagnosis of IC/PBS can be made without cystoscopic hydrodistention in women with increased bladder sensation, having storage symptoms, a CBC ≤ 350 ml, a positive KCl test result and a VAS score ≥ 2. © 2011 Blackwell Publishing Ltd.

Leung T.K.,Taipei Medical University Hospital
The Chinese journal of physiology | Year: 2013

Previous biomolecular and animal studies have shown that a room-temperature far-infrared-rayemitting ceramic material (bioceramic) demonstrates physical-biological effects, including the normalization of psychologically induced stress-conditioned elevated heart rate in animals. In this clinical study, the Harvard step test, the resting metabolic rate (RMR) assessment and the treadmill running test were conducted to evaluate possible physiological effects of the bioceramic material in human patients. The analysis of heart rate variability (HRV) during the Harvard step test indicated that the bioceramic material significantly increased the high-frequency (HF) power spectrum. In addition, the results of RMR analysis suggest that the bioceramic material reduced oxygen consumption (VO2). Our results demonstrate that the bioceramic material has the tendency to stimulate parasympathetic responses, which may reduce resting energy expenditure and improve cardiorespiratory recovery following exercise.

Su C.-M.,Taipei Medical University Hospital
Oncogene | Year: 2015

MicroRNAs (miRNAs) are small RNAs that suppress gene expression by their interaction with 3’untranslated region of specific target mRNAs. Although the dysregulation of miRNAs has been identified in human cancer, only a few of these miRNAs have been functionally documented in breast cancer. Thus, defining the important miRNA and functional target involved in chemoresistance is an urgent need for human breast cancer treatment. In this study, we, for the first time, identified a key role of miRNA 520h (miR-520h) in drug resistance. Through protecting cells from paclitaxel-induced apoptosis, expression of miR-520h promoted the drug resistance of human breast cancer cells. Bioinformatics prediction, compensatory mutation and functional validation further confirmed the essential role of miR-520h-suppressed Death-associated protein kinase 2 (DAPK2) expression, as restoring DAPK2 abolished miR-520h-promoted drug resistance, and knockdown of DAPK2 mitigated cell death caused by the depletion of miR-520h. Furthermore, we observed that higher level of miR-520h is associated with poor prognosis and lymph node metastasis in human breast cancer patients. These results show that miR-520h is not only an independent prognostic factor, but is also a potential functional target for future applications in cancer therapeutics.Oncogene advance online publication, 18 May 2015; doi:10.1038/onc.2015.168. © 2015 Macmillan Publishers Limited

Wu C.-H.,Taipei Medical University | Lee C.-H.,Taipei Medical University | Ho Y.-S.,Taipei Medical University | Ho Y.-S.,Taipei Medical University Hospital
Clinical Cancer Research | Year: 2011

The nicotinic acetylcholine receptor (nAChR) was first characterized in 1970 as a membrane receptor of a neurotransmitter and an ion channel. nAChRs have been shown to be involved in smoking-induced cancer formation in multiple types of human cancer cells. In vitro and in vivo animal studies have shown that homopentameric nAChR inhibitors, such as methyllycaconitine and α-Bgtx, can attenuate nicotine-induced proliferative, angiogenic, and metastatic effects in lung, colon, and bladder cancer cells. Recent publications have shown that α9-nAChR is important for breast cancer formation, and in many in vivo studies, α9-nAChR-specific antagonists (e.g., α-ImI, α-ImI, Vc1.1, RgIA, and It14a) produced an analgesic effect. Vc1.1 functions in a variety of animal pain models and currently has entered phase II clinical trials. For cancer therapy, natural compounds such as garcinol and EGCG have been found to block nicotine- and estrogen-induced breast cancer cell proliferation through inhibition of the α9-nAChR signaling pathway. A detailed investigation of the carcinogenic effects of nAChRs and their specific antagonists would enhance our understanding of their value as targets for clinical translation. ©2011AACR.

Kang J.-H.,Taipei Medical University Hospital | Lin H.-C.,Taipei Medical University Hospital
Journal of Neurotrauma | Year: 2012

The etiology of multiple sclerosis (MS) is still not well known. Previous data show conflicting results regarding the association between MS and prior brain trauma. This study aims to investigate the risk for MS following a traumatic brain injury (TBI) using a large-scale cohort study design. This study used data from the National Health Insurance Research Database. A total of 72,765 patients with TBI were identified and included as the study cohort, and 218,295 randomly selected subjects were matched with the study cohort by sex and age as controls. We traced each patient individually for a 6-year period from their index health care utilization to identify those who received a subsequent diagnosis of MS. We used the Kaplan-Meier method and the log-rank test to compare the difference in 6-year MS-free survival rates between the two groups. Stratified Cox proportional hazard regressions were computed to compare the risk of developing MS for these two cohorts. Patients with TBI had a higher incidence of MS during the 6-year period than the comparison group (0.055% versus 0.037%). After excluding cases who died from non-MS causes, stratifying for hospitalization of cases as a proxy for severity, and adjusting for monthly income and geographic region of the community in which the patient resided, the hazard ratio (HR) of MS for patients with hospital-treated TBI injuries was 1.97 (95% CI 1.31,2.93, p<0.01) that of patients without TBI during the 6-year follow-up period after index health care use. Our study concludes that patients with TBI are at higher risk for subsequent MS over a 6-year follow-up period. © 2012, Mary Ann Liebert, Inc.

STUDY DESIGNS.: Meta-analysis OBJECTIVE.: perform a comprehensive search of current literature and conduct a meta-analysis of randomized controlled trials (RCTs) to assess the neck pain-relieving effect of intermittent cervical traction (ICT). SUMMARY OF BACKGROUND DATA.: Neck pain is a common and disabling problem with a high prevalence in general population. It causes a considerable burden on the health care system with a substantial expenditure. ICT is a common component of physical therapy for neck pain in the outpatient clinic. However, the evidence regarding the effectiveness of ICT for neck pain is insufficient. METHODS.: Data were obtained from the PubMed, Cochrane Library, Embase, and Scopus databases from the database inception date to July 02, 2016. RCTs reporting the effects of ICT on neck pain, including those comparing the effects of ICT with those of a placebo treatment, were included. Two reviewers independently reviewed the studies, conducted a risk of bias assessment, and extracted data. The data were pooled in a meta-analysis by using a random-effects model. RESULTS.: The meta-analysis included 7 RCTs. The results indicated that patients who received ICT for neck pain had significantly lower pain scores than those receiving placebos did immediately after treatment (standardized mean difference?=?−0.26, 95% confidence interval?=?−0.46 to −0.07). The pain scores during the follow-up period and the neck disability index scores immediately after treatment and during the follow-up period did not differ significantly. CONCLUSIONS.: ICT may have a short-term neck pain-relieving effect. Some risks of bias were noted in the included studies, reducing the evidence level of this meta-analysis. Additional high-quality RCTs are required to clarify the long-term effects of ICT on neck pain.Level of Evidence: 1 Copyright © 2016 Wolters Kluwer Health, Inc. All rights reserved.

Kang J.-H.,Taipei Medical University Hospital | Chen Y.-H.,Taipei Medical University | Lin H.-C.,Taipei Medical University
Annals of the Rheumatic Diseases | Year: 2010

Objective: Ankylosing spondylitis (AS) is a systemic inflammatory disease that can result in chronic pain and disability. This study aimed to analyse the prevalence and risk of medical comorbidities in patients with AS compared with the general population. Methods: 11 701 patients with AS and 58 505 matching controls were selected for analysis from the National Health Insurance Research Dataset (NHIRD) in Taiwan. The Elixhauser comorbidity index was used for selecting medical comorbidities. Pearson χ2 tests and conditional logistic regression a nalyses were performed to examine the prevalence and risk of comorbidities between these two groups. Results: Patients with AS were at increased risk for multiple systemic comorbidities including cardiovascular, neurological, pulmonary, gastrointestinal, endocrine, haematological and mental illness. The most prevalent comorbidities in patients with AS were hypertension (16.4%), peptic ulcers (13.9%) and headaches (10.2%). Conclusion: The results show that patients with AS have a higher prevalence of multiple comorbidities than the general population in Taiwan. These findings are consistent with previous studies done in Western populations. The results could be useful for both the clinical management of patients with AS and for researching the underlying pathological mechanisms.

Loading Taipei Medical University Hospital collaborators
Loading Taipei Medical University Hospital collaborators