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Diagnosis and Management of Acanthamoeba Keratitis

Yoon HY, Jeon HS

Acanthamoeba keratitis (AK) is a vision-threatening corneal infection that most frequently affects contact lens wearers. Severe pain out of proportion to the corneal findings, radial keratoneuritis, and ring infiltration are...
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Acanthoamoeba Keratitis Induced by a Therapeutic, Soft Contact Lens: Diagnosis via Gram Staining

Lee SY, Cho YK

Purpose: We report two cases of Acanthamoeba keratitis diagnosed by Gram staining in patients who had recently worn therapeutic, soft contact lenses and had no history of lens use for...
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Differentially Expressed Gene Profile of Acanthamoeba castellanii Induced by an Endosymbiont Legionella pneumophila

Moon EK, Park SM, Chu KB, Quan FS, Kong HH

Legionella pneumophila is an opportunistic pathogen that survives and proliferates within protists such as Acanthamoeba spp. in environment. However, intracellular pathogenic endosymbiosis and its implications within Acanthamoeba spp. remain poorly...
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Diagnostic Utility of Polymerase Chain Reaction for Acanthamoeba in Contact Lens-related Keratitis with Epithelial Defects

Kang MC, Lim DH, Huh HJ, Yoo IY, Chung TY

PURPOSE: To report contact lens related Acanthamoeba keratitis with corneal epithelial defect cases which were diagnosed using polymerase chain reaction (PCR). CASE SUMMARY: A 51-year-old male visited our hospital for loss...
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The First Acanthamoeba keratitis Case of Non-Contact Lens Wearer with HIV Infection in Thailand

Tananuvat , Techajongjintana N, Somboon P, Wannasan A

Acanthamoeba keratitis (AK) is a rare sight-threatening corneal infection, often reporting from contact lens wearers. An asymptomatic human immunodeficiency virus (HIV)-infected Thai male without history of contact lens use complained...
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Acanthamoeba in Southeast Asia – Overview and Challenges

Bunsuwansakul C, Mahboob T, Hounkong K, Laohaprapanon S, Chitapornpan S, Jawjit S, Yasiri A, Barusrux S, Bunluepuech K, Sawangjaroen N, Salibay CC, Kaewjai C, de Lourdes Pereira M, Nissapatorn V

Acanthamoeba, one of free-living amoebae (FLA), remains a high risk of direct contact with this protozoan parasite which is ubiquitous in nature and man-made environment. This pathogenic FLA can cause...
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Cytopathic Change and Inflammatory Response of Human Corneal Epithelial Cells Induced by Acanthamoeba castellanii Trophozoites and Cysts

Sohn HJ, Seo GE, Lee JH, Ham AJ, Oh YH, Kang H, Shin HJ

Acanthamoeba castellanii has ubiquitous distribution and causes primary acanthamoebic keratitis (AK). AK is a common disease in contact lens wearers and results in permanent visual impairment or blindness. In this...
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Identification and Genotypic Characterization of Potentially Pathogenic Acanthamoeba Isolated from Tap Water in Wuxi, China

Wang M, Sun G, Sun Y, You X, Li X, Cheng Y, Xuan Y

Members of genus Acanthamoeba are widely distributed in the environment. Some are pathogenic and cause keratitis and fatal granulomatous amoebic encephalitis. In this study, we isolated an Acanthamoeba CJW/W1 strain...
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Comparison of Proteins Secreted into Extracellular Space of Pathogenic and Non-pathogenic Acanthamoeba castellanii

Moon EK, Choi HS, Park SM, Kong HH, Quan FS

Pathogenic Acanthamoeba spp. cause granulomatous amoebic encephalitis and keratitis. Acanthamoeba keratitis (AK) is a rare but serious ocular infection that can result in permanent visual impairment or blindness. However, pathogenic...
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Effect of 2, 6-Dichlorobenzonitrile on Amoebicidal Activity of Multipurpose Contact Lens Disinfecting Solutions

Moon EK, Lee S, Quan FS, Kong HH

Multipurpose contact lens disinfecting solutions (MPDS) are widely used to cleanse and disinfect microorganisms. However, disinfection efficacy of these MPDS against Acanthamoeba cyst remain insufficient. 2, 6-dichlorobenzonitrile (DCB), a cellulose...
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Molecular and Biochemical Properties of a Cysteine Protease of Acanthamoeba castellanii

Hong Y, Kang JM, Joo SY, Song SM, Lê HG, Thái TL, Lee J, Goo YK, Chung DI, Sohn WM, Na BK

Acanthamoeba spp. are free-living protozoa that are opportunistic pathogens for humans. Cysteine proteases of Acanthamoeba have been partially characterized, but their biochemical and functional properties are not clearly understood yet....
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Adhesion of Acanthamoeba on Cosmetic Contact Lenses

Lee SM, Lee JE, Lee DI, Yu HS

BACKGROUND: This study aimed to evaluate the adhesion of Acanthamoeba trophozoites on cosmetic contact lenses (CLs) with and without CL care multipurpose solution (MPS) treatment. METHODS: Acanthamoeba lugdunensis L3a trophozoites were...
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Efficient Liquid Media for Encystation of Pathogenic Free-Living Amoebae

Sohn HJ, Kang H, Seo GE, Kim JH, Jung SY, Shin HJ

Pathogenic Naegleria fowleri, Acanthamoeba castellanii, and Acanthamoeba polyphaga, are distributed worldwide. They are causative agents of primary amoebic meningoencephalitis or acanthamoebic keratitis in humans, respectively. Trophozoites encyst in unfavorable environments,...
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Amoebicidal Effect of Nephrite-containing Contact Lens Storage Case

Jung JW, Lee JH, Park SH, Yu HS, Kim YK, Lee JE

PURPOSE: To compare the amoebicidal effects of nephrite containing contact lens (CL) storage cases with conventional CL storage cases. METHODS: Acanthamoeba lugdunensis were inoculated onto 5% nephrite containing CL storage cases...
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DNA Methylation of Gene Expression in Acanthamoeba castellanii Encystation

Moon EK, Hong Y, Lee HA, Quan FS, Kong HH

Encystation mediating cyst specific cysteine proteinase (CSCP) of Acanthamoeba castellanii is expressed remarkably during encystation. However, the molecular mechanism involved in the regulation of CSCP gene expression remains unclear. In...
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Identification and Characterization of Protein Arginine Methyltransferase 1 in Acanthamoeba castellanii

Moon EK, Kong HH, Hong Y, Lee HA, Quan FS

Protein arginine methyltransferase (PRMT) is an important epigenetic regulator in eukaryotic cells. During encystation, an essential process for Acanthamoeba survival, the expression of a lot of genes involved in the...
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Efficacy of Korean Multipurpose Contact Lens Disinfecting Solutions against Acanthamoeba castellanii

Moon EK, Park HR, Quan FS, Kong HH

Acanthamoeba keratitis has been increasing in recent years. Main risk factors are contact lens wear and their cleaning solutions. Most contact lens wearers use multipurpose disinfecting solutions (MPDS) for cleansing...
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Isolation and Genotyping of Acanthamoeba spp. as Neglected Parasites in North of Iran

Shokri A, Sarvi S, Daryani A, Sharif M

Acanthamoeba, a free-living amoeba, is widely distributed in the environment, water sources, soil, dust, and air. It can cause keratitis in contact lens wearers with poor hygiene and also fatal...
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Identification of Protein Arginine Methyltransferase 5 as a Regulator for Encystation of Acanthamoeba

Moon EK, Hong Y, Chung DI, Goo YK, Kong HH

Encystation is an essential process for Acanthamoeba survival under nutrient-limiting conditions and exposure to drugs. The expression of several genes has been observed to increase or decrease during encystation. Epigenetic...
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Two Cases of Corneal Toxicity in Acanthamoeba Keratitis by Combined Topical Anti-Acanthamoeba Keratitis Eye Solution

Lee JK, Lee JS

PURPOSE: To present a case of corneal toxicity caused by therapeutic duplication during treatment of acanthamoeba keratitis as a complication of contact lens use. CASE SUMMARY: A 12-year-old girl with a...
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