MyMedR

Displaying all 13 publications

Abstract:

Sort:

A highly sensitive fluorescent viscosity sensor

Yusop RM, Unciti-Broceta A, Bradley M

Bioorg Med Chem Lett, 2012 Sep 15;22(18):5780-3.
PMID: 22901897 DOI: 10.1016/j.bmcl.2012.07.101

Variation at the 3' position of fluorescein via Suzuki-Miyaura cross-coupling with aryl and heteroaryl moieties gave a family of anthofluoresceins whose spectroscopic properties were studied. The 1-methylindole derivative gave the highest quantum yield and was observed to behave as a molecular rotor, displaying marked variations in fluorescent intensities with viscosity and offering possible application in cellular sensing and fluorescent polarisation assays.

Matched MeSH terms: Fluoresceins/chemical synthesis; Fluoresceins/chemistry*
Fulltext The effect of daily religious fasting on tear film characteristics and ocular surface

Wan Nur Farhana Ibrahim, Mohd Zulfaezal Che Azemin

International Journal of Allied Health Sciences, 2018;2(1):108-116.
MyJurnal

Religious fasting is an act of refraining oneself from eating and drinking beginning at dawn until sunset. The changes in meal time and long period of meal constraint may influence the tear quality and ocular surface. The purpose of this study was to investigate the effect of daily religious fasting on tear film characteristics and ocular surface integrity. This is a prospective study involving 29 eyes from 29 healthy participants. The tear film characteristics were assessed by measuring the non-invasive tear break-up time (NITBUT), tear meniscus height (TMH), total tear secretion, and
fluorescein ocular surface staining method was used to determine the ocular surface integrity. The measurements were performed in the morning (8.00 to 10.00 a.m.) and evening (4.00 to 6.00 p.m.) during each non-fasting and fasting period. The results showed no statistically significant difference noted for all parameters measured in the morning when comparison was made between non-fasting and fasting periods. Conversely, in the evening, NITBUT value was significantly lower during fasting period, (p = 0.001), but, TMH, total tear secretion and ocular surface staining revealed no significant differences between non-fasting and fasting periods. Our study revealed
that daily religious fasting only significantly reduced the NITBUT value in the evening which possibly due to dehydration; however, it did not affect TMH, total tear secretion and ocular surface integrity. The absence of fluid loading at pre-dawn meal could be the reason of non-noticeable differences noted in the morning

Matched MeSH terms: Fluoresceins
Effect of PEGylated lipid and Lecinol S-10 on physico-chemical properties and encapsulation efficiency of palmitoleate-palmitoleic acid vesicles

Teo YY, Misran M, Low KH

J Liposome Res, 2014 Sep;24(3):241-8.
PMID: 24597523 DOI: 10.3109/08982104.2014.891234

A vesicle is a microscopic particle composed of a lipid bilayer membrane that separates the inner aqueous compartment from the outer aqueous environment. Palmitoleate-palmitoleic acid vesicles were prepared and their physico-chemical properties were investigated. Moreover, mixed vesicles composed of palmitoleic acid and PEGylated lipid and/or a mixture of phospholipids were also prepared. The stabilizing effects of these double-chain lipids on the formation of palmitoleate-palmitoleic acid vesicles were studied. Stability of the vesicle suspension was examined using particle size and zeta potential at 30 °C. The magnitude of the zeta potential was relatively lower in the vesicle suspension with the presence of phospholipid. Although some of the mixed vesicles that were formed were not very stable, they displayed potential for encapsulating the active ingredient calcein and the encapsulation efficiencies of calcein were encouraging. The palmitoleate-palmitoleic acid-DPPE-PEG2000 vesicle showed the most promising stability and encapsulation efficiency.

Matched MeSH terms: Fluoresceins/administration & dosage
Fulltext Bilateral profound visual loss as a consequence of leukaemia – a case report

Raajini, Devi K., Safinaz, M.K., Hazlita, M.I.

Journal of Surgical Academia, 2015;5(1):61-63.
MyJurnal

An 18-year-old Malay gentleman was noted to have profound bilateral blurred vision for one month duration, associated with loss of weight, appetite, low grade fever and abdominal distension. Visual acuity on presentation was 6/60 on the right, counting finger on the left with no afferent pupillary defect. Anterior segments were unremarkable. Vitreous cells were occasional bilaterally. Fundus revealed multiple choroidal and sub-retinal Roth spots with areas of pre-retinal and intra-retinal haemorrhages, involving the macula in the left eye. Vessels were dilated and tortuous in all quadrants of the right eye. Many areas of capillary fall out at peripheral retina were demonstrated in fundus fluorescein angiogram. Further systemic and laboratory review confirmed the diagnosis of CML and chemotherapy was initiated. Both eye ischaemic retinopathy secondary to CML was confirmed and scatter pan retinal photocoagulation was performed bilaterally. Good improvement in vision noted during subsequent follow up to 6/24 on the right, 6/60 on the left. High levels of suspicion and accurate early recognition of fundus changes are vital in these types of cases to ensure the institution of prompt treatment.

Matched MeSH terms: Fluoresceins
Fulltext Flourescein angiogram and funduscopic features of radiation induced retinopathy: a descriptive value of retinopathy severity in patients with nasopharyngeal carcinoma

Norshamsiah, M.D., Wan Haslina Wah, Kok, H.S., Sharifa Ezat, W.P., Fuad, I.

Medicine & Health, 2015;10(1):23-31.
MyJurnal

Radiation retinopathy (RR) is a known complication after radiotherapy for Nasopharyngeal Carcinoma (NPC). This study aims to relate the relationship of RR and radiation dose in patients with NPC through assessment with clinical
funduscopy and fundus fluorescein angiogram (FFA). A cross sectional study was conducted on patients with NPC who had completed radiotherapy treatment in the Oncology Clinic, Universiti Kebangsaan Malaysia Medical Centre (UKMMC). Eighty two eyes of 42 patients were examined and the prevalence of RR was found to be 35.4%. The severity of RR is strongly associated with the dose of radiation to the retina (Spearman correlation value=0.48; p<0.001). The common features of RR assessed by FFA were telangiectatic vessels (26.2%) and capillary non-perfusion (14.3%). Retinal neovasularization occurred in 10.7% of eyes. The level of visual deterioration correlated with the severity of RR with 26% of eyes experiencing a visual acuity of 6/18 or worse. More than one third of patients developed RR, with radiation maculopathy being the commonest cause for significant visual loss. FFA is a useful tool in detecting early signs of radiation retinopathy and maculopathy.
Keywords: nasopharyngeal carcinoma, fluorescein fundus angiography, retinopathy, radiotherapy
Study site: Oncology Clinic, Pusat Perubatan Universiti Kebangsaan Malaysia (PPUKM), Kuala Lumpur, Malaysia

Matched MeSH terms: Fluoresceins
Fulltext The Use of Stents in Children with Nasolacrimal Duct Obstruction Requiring Surgical Intervention: A Systematic Review

Tai ELM, Kueh YC, Abdullah B

Int J Environ Res Public Health, 2020 02 07;17(3).
PMID: 32046207 DOI: 10.3390/ijerph17031067

Nasolacrimal duct obstruction (NLDO) is the most common cause of childhood epiphora. It is managed conservatively in the first year of life, after which surgical treatment is classically based on a stepwise paradigm of probing, intubation, and dacryocystorhinostomy. This systematic review aims to present the current role of intubation in the management of children with NLDO requiring surgical intervention. A search for English-language articles from the electronic databases PubMed, SCOPUS, and the COCHRANE library was conducted over a period of five months in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines and the Cochrane Handbook. The following keywords were used to aid retrieval: stents, children, lacrimal intubation, endoscopic dacryocystorhinostomy, external dacryocystorhinostomy, NLDO, dacryocystitis, congenital, acquired. The primary outcome was defined as the success of the intervention, determined by resolution of symptoms and patency of the lacrimal anatomy confirmed by the fluorescein dye disappearance test or syringing. Secondary outcomes included the presence of complications. A total of 144 articles were identified; of these, 35 fulfilled the study criteria. The majority of the included studies involved lacrimal intubation alone, followed by intubation as an adjunctive procedure to balloon dacryoplasty and dacryocystorhinostomy. The overall success rate of these procedures ranged from 41.1% to 100%. Post-operative complications were reported in 65.7% of the included studies. Lacrimal intubation was most commonly performed as a primary procedure in children with NLDO, with high success rates. The main complication was stent dislodgement. There is lack of evidence regarding the benefit of intubation over probing as primary treatment of congenital NLDO. In the absence of high-quality evidence, the decision of whether to perform lacrimal intubation in children with NLDO requiring surgical intervention depends on clinical judgement and other low-level evidence, such as observational non-randomised trials.

Matched MeSH terms: Fluoresceins
The immunosuppressive effects of human bone marrow-derived mesenchymal stem cells target T cell proliferation but not its effector function

Ramasamy R, Tong CK, Seow HF, Vidyadaran S, Dazzi F

Cell Immunol, 2008 Feb;251(2):131-6.
PMID: 18502411 DOI: 10.1016/j.cellimm.2008.04.009

Mesenchymal stem cells (MSC) are non-haematopoietic stem cells that are capable of differentiating into tissues of mesodermal origin. MSC play an important role in supporting the development of fetal and adult haematopoiesis. More recently, MSC have also been found to exhibit inhibitory effect on T cell responses. However, there is little information on the mechanism of this immunosuppression and our study addresses this issue by targeting T cell functions at various level of immune responses. We have generated MSC from human adult bone marrow (BM) and investigated their immunoregulatory function at different phases of T cell responses. MSC showed the ability to inhibit mitogen (CD3/CD28 microbeads)-activated T cell proliferation in a dose-dependent manner. In order to evaluate the specificity of this immunosuppression, the proliferation of CD4(+) and CD8(+) cells were measured. MSC equally inhibit CD4(+) and CD8(+) subpopulations of T cells in response to PHA stimulation. However, the antiproliferative effect of MSC is not due to the inhibition of T cell activation. The expression of early activation markers of T cells, namely CD25 and CD69 were not significantly altered by MSC at 24, 48 and 72h. Furthermore, the immunosuppressive effect of MSC mainly targets T cell proliferation rather than their effector function since cytotoxicity of T cells is not affected. This work demonstrates that the immunosuppressive effect of MSC is exclusively a consequence of an anti-proliferative activity, which targets T cells of different subpopulations. For this reason, they have the potential to be exploited in the control of unwanted immune responses such as graft versus host disease (GVHD) and autoimmunity.

Matched MeSH terms: Fluoresceins/metabolism
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: Fluoresceins
Fulltext Choroidal metastasis from renal cell carcinoma presenting with exudative retinal detachment

Hor, S.M., Mushawiahti, M.

Journal of Surgical Academia, 2017;7(1):62-65.
MyJurnal

A 42-year-old Chinese man, known case of renal cell carcinoma with lung metastasis, was referred to Universiti
Kebangsaan Malaysia Medical Centre for left eye blurring of vision for one month duration, which was worse upon
waking up in the morning and cleared up after 1-2 hours. On examination, visual acuities were 6/6 in both eyes. No
relative afferent pupillary defect. Left fundus showed inferonasal retinal detachment without macular involvement.
No retina break, no retinitis and no choroidal lesion seen. Right eye examination was normal. Optical coherence
tomography (OCT) of left eye showed subretinal fluid temporal and inferior to optic disc. Fundus fluorescein
angiography (FFA) left eye showed hypofluoresence in early phase but hyperfluorescence with pin point leakage in
late phase over inferonasal quadrant. Indocyanine green (ICG) showed early hypofluoresence with late pin point
hyperfluoresence in the same quadrant. A clinical diagnosis of exudative retinal detachment due to choroidal
metastasis secondary to renal cell carcinoma was made. The patient was planned for cyber-knife radiotherapy of his
left eye but unfortunately we lost the follow up. High index of suspicion and relevant investigation are needed for
patients with visual complaints and history of renal cell carcinoma to diagnose choroidal metastasis.

Matched MeSH terms: Fluoresceins
Fulltext Retinal vasculitis in systemic lupus erythematosus: an indication of active disease

Md Noh UK, Zahidin AZ, Yong TK

Clin Pract, 2012 Mar 30;2(2):e54.
PMID: 24765453 DOI: 10.4081/cp.2012.e54

A 26-year-old woman with a recent flare-up of systemic lupus erythematosus presented with peripheral retinal hemorrhages at a routine check-up. She is on a tapering dose of immunosuppressive agents. Her visual acuity was good. Fluorescein angiogram revealed vasculitic changes with capillary non-perfusion areas. A few weeks later, she developed cerebral lupus with advanced lupus nephritis. Immunosuppressive therapy was restarted and panretinal photocoagulation was delivered. Her visual acuity remained stable, despite development of a cataract from prednisolone therapy.

Matched MeSH terms: Fluoresceins
Fulltext Establishment of an in vitro system representing the chicken gut-associated lymphoid tissue

Alitheen NB, McClure SJ, Yeap SK, Kristeen-Teo YW, Tan SW, McCullagh P

PLoS One, 2012;7(11):e49188.
PMID: 23185307 DOI: 10.1371/journal.pone.0049188

The bursa of Fabricius is critical for B cell development and differentiation in chick embryos. This study describes the production in vitro, from dissociated cell suspensions, of cellular agglomerates with functional similarities to the chicken bursa. Co-cultivation of epithelial and lymphoid cells obtained from embryos at the appropriate developmental stage regularly led to agglomerate formation within 48 hours. These agglomerates resembled bursal tissue in having lymphoid clusters overlaid by well organized epithelium. Whereas lymphocytes within agglomerates were predominantly Bu-1a(+), a majority of those emigrating onto the supporting membrane were Bu-1a(-) and IgM(+). Both agglomerates and emigrant cells expressed activation-induced deaminase with levels increasing after 24 hours. Emigrating cells were actively proliferating at a rate in excess of both the starting cell population and the population of cells remaining in agglomerates. The potential usefulness of this system for investigating the response of bursal tissue to avian Newcastle disease virus (strain AF2240) was examined.

Matched MeSH terms: Fluoresceins/metabolism
Fulltext Pharmacologically antagonizing the CXCR4-CXCL12 chemokine pathway with AMD3100 inhibits sunlight-induced skin cancer

Sarchio SNE, Scolyer RA, Beaugie C, McDonald D, Marsh-Wakefield F, Halliday GM, et al.

J Invest Dermatol, 2014 Apr;134(4):1091-1100.
PMID: 24226205 DOI: 10.1038/jid.2013.424

One way sunlight causes skin cancer is by suppressing anti-tumor immunity. A major mechanism involves altering mast cell migration via the C-X-C motif chemokine receptor 4-C-X-C motif chemokine ligand 12 (CXCR4-CXCL12) chemokine pathway. We have discovered that pharmacologically blocking this pathway with the CXCR4 antagonist AMD3100 prevents both UV radiation-induced immune suppression and skin cancer. The majority of control mice receiving UV-only developed histopathologically confirmed squamous cell carcinomas. In contrast, skin tumor incidence and burden was significantly lower in AMD3100-treated mice. Perhaps most striking was that AMD3100 completely prevented the outgrowth of latent tumors that occurred once UV irradiation ceased. AMD3100 protection from UV immunosuppression and skin cancer was associated with reduced mast cell infiltration into the skin, draining lymph nodes, and the tumor itself. Thus a major target of CXCR4 antagonism was the mast cell. Our results indicate that interfering with UV-induced CXCL12 by antagonizing CXCR4 significantly inhibits skin tumor development by blocking UV-induced effects on mast cells. Hence, the CXCR4-CXCL12 chemokine pathway is a novel therapeutic target in the prevention of UV-induced skin cancer.

Matched MeSH terms: Fluoresceins/chemistry
Optic Nerve Infiltration in Systemic Metastatic Retinal Lymphoma (SMRL): Multimodal Imaging and Challenges in Diagnosis

Mohd Fauzi Yap MFB, Mohd Zain A, Tumain NR, Palaniappan S, Nasaruddin RA, Md Din N

Ocul Immunol Inflamm, 2020 Sep 24.
PMID: 32967510 DOI: 10.1080/09273948.2020.1800050

A 45-year-old man was diagnosed with diffuse large B-cell lymphoma stage IV which was confirmed by celiac lymph node biopsy. He subsequently completed six cycles of R-CHOP chemotherapy. Six months later, he presented with panuveitis OU with positive relative afferent pupillary defect OD. OCT revealed hyper-reflective lesions and irregularity of the retinal pigment epithelium OU. Fundus fluorescein angiogram shows hyper-auto fluorescence and granular changes on the retina. A month later, he developed swollen optic disc OD and hemorrhagic retinitis OU and treated as presumed CMV retinitis. Anti-TB was started after a positive Mantoux test. He finally consented for a vitreous biopsy which showed atypical lymphoid cells highly suggestive for vitreoretinal lymphoma and subsequently received intravitreal methotrexate OU.
CONCLUSION: Optic nerve infiltration in systemic metastatic retinal lymphoma may have initial occult signs but with profound visual loss. Ocular infections like CMV retinitis and tuberculosis may mask and delay the diagnosis in immunocompromised patients.

Matched MeSH terms: Fluoresceins

Filters

Please provide feedback to Administrator ([email protected])

External Links