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https://www.readbyqxmd.com/read/28936464/innate-immune-responses-to-cryptococcus
#1
Lena J Heung
Cryptococcus species are encapsulated fungi found in the environment that predominantly cause disease in immunocompromised hosts after inhalation into the lungs. Even with contemporary antifungal regimens, patients with cryptococcosis continue to have high morbidity and mortality rates. The development of more effective therapies may depend on our understanding of the cellular and molecular mechanisms by which the host promotes sterilizing immunity against the fungus. This review will highlight our current knowledge of how Cryptococcus, primarily the species C...
September 2017: Journal of Fungi (Basel, Switzerland)
https://www.readbyqxmd.com/read/28927230/multi-azole-resistant-strains-of-cryptococcus-neoformans-var-grubii-isolated-from-a-flz-resistant-strain-by-culturing-in-medium-containing-voriconazole
#2
Rui Kano, Miki Okubo, Atsuhiko Hasegawa, Hiroshi Kamata
A Cryptococcus neoformans var. grubii strain, NUBS14020, was the first fluconazole (FLZ)-resistant strain isolated from a feline cryptococcosis. Subsequent work demonstrated that multi-azole-resistant strains are readily isolated from FLZ-resistant strains by culturing in medium containing voriconazole (VRZ). The resulting clones were assessed for mutation and expression of known target genes, including the loci encoding lanosterol 14-α demethylase (ERG11), an ATP-binding cassette (ABC) transporter (AFR1), or a multidrug efflux pump (MEP); mutation and/or overexpression of these genes is known to be associated with azole resistance...
September 11, 2017: Medical Mycology: Official Publication of the International Society for Human and Animal Mycology
https://www.readbyqxmd.com/read/28919350/crystal-structure-of-inositol-1-3-4-5-6-pentakisphosphate-2-kinase-from-cryptococcus-neoformans
#3
Juntaek Oh, Dong-Gi Lee, Yong-Sun Bahn, Sangkee Rhee
The fungal pathogen Cryptococcus neoformans is a causative agent of meningoencephalitis in humans. For its pathogenicity, the inositol polyphosphate biosynthetic pathway plays critical roles. Recently, Ipk1 from C. neoformans (CnIpk1) was identified as an inositol 1,3,4,5,6-pentakisphosphate 2-kinase that catalyzes the phosphorylation of IP5 to form IP6, a substrate for subsequent reaction to produce inositol pyrophosphates, such as PP-IP5/IP7. Furthermore, it was shown that deletion of IPK1 significantly reduces the virulence of C...
September 15, 2017: Journal of Structural Biology
https://www.readbyqxmd.com/read/28883816/modulation-of-zinc-homeostasis-in-acanthamoeba-castellanii-as-a-possible-antifungal-strategy-against-cryptococcus-gattii
#4
Nicole S Ribeiro, Francine M Dos Santos, Ane W A Garcia, Patrícia A G Ferrareze, Laura F Fabres, Augusto Schrank, Livia Kmetzsch, Marilise B Rott, Marilene H Vainstein, Charley C Staats
Cryptococcus gattii is a basidiomycetous yeast that can be found in the environment and is one of the agents of cryptococcosis, a life-threatening disease. During its life cycle, cryptococcal cells take hold inside environmental predators such as amoebae. Despite their evolutionary distance, macrophages and amoebae share conserved similar steps of phagocytosis and microbial killing. To evaluate whether amoebae also share other antifungal strategies developed by macrophages, we investigated nutritional immunity against cryptococcal cells...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28875175/importance-of-resolving-fungal-nomenclature-the-case-of-multiple-pathogenic-species-in-the-cryptococcus-genus
#5
Ferry Hagen, H Thorsten Lumbsch, Valentina Arsic Arsenijevic, Hamid Badali, Sebastien Bertout, R Blake Billmyre, M Rosa Bragulat, F Javier Cabañes, Mauricio Carbia, Arunaloke Chakrabarti, Sudha Chaturvedi, Vishnu Chaturvedi, Min Chen, Anuradha Chowdhary, Maria-Francisca Colom, Oliver A Cornely, Pedro W Crous, Maria S Cuétara, Mara R Diaz, Ana Espinel-Ingroff, Hamed Fakhim, Rama Falk, Wenjie Fang, Patricia F Herkert, Consuelo Ferrer Rodríguez, James A Fraser, Josepa Gené, Josep Guarro, Alexander Idnurm, María-Teresa Illnait-Zaragozi, Ziauddin Khan, Kantarawee Khayhan, Anna Kolecka, Cletus P Kurtzman, Katrien Lagrou, Wanqing Liao, Carlos Linares, Jacques F Meis, Kirsten Nielsen, Tinashe K Nyazika, Weihua Pan, Marina Pekmezovic, Itzhack Polacheck, Brunella Posteraro, Flavio de Queiroz Telles, Orazio Romeo, Manuel Sánchez, Ana Sampaio, Maurizio Sanguinetti, Pojana Sriburee, Takashi Sugita, Saad J Taj-Aldeen, Masako Takashima, John W Taylor, Bart Theelen, Rok Tomazin, Paul E Verweij, Retno Wahyuningsih, Ping Wang, Teun Boekhout
Cryptococcosis is a major fungal disease caused by members of the Cryptococcus gattii and Cryptococcus neoformans species complexes. After more than 15 years of molecular genetic and phenotypic studies and much debate, a proposal for a taxonomic revision was made. The two varieties within C. neoformans were raised to species level, and the same was done for five genotypes within C. gattii. In a recent perspective (K. J. Kwon-Chung et al., mSphere 2:e00357-16, 2017, https://doi.org/10.1128/mSphere.00357-16), it was argued that this taxonomic proposal was premature and without consensus in the community...
July 2017: MSphere
https://www.readbyqxmd.com/read/28857298/cryptococcosis-in-patients-with-diabetes-mellitus-ii-in-mainland-china-1993-2015
#6
Yingfang Li, Wenjie Fang, Weiwei Jiang, Ferry Hagen, Jia Liu, Lei Zhang, Nan Hong, Yu Zhu, Xiaoguang Xu, Xia Lei, Danqi Deng, Jianping Xu, Wanqing Liao, Teun Boekhout, Min Chen, Weihua Pan
Diabetes mellitus II (DM II) is a newly defined independent factor contributing to the morbidity and mortality of cryptococcosis. This retrospective case analysis aims to explore the epidemiology, clinical profile and strain characteristics of cryptococcosis in Chinese DM II patients. This study included 30 cases of cryptococcosis with DM II occurring from 1993 to 2015 in mainland China. The hospital-based prevalence of cryptococcosis in DM II was 0.21%. The mean age of the patients was 56.1 years (95% confidence interval: 51...
August 30, 2017: Mycoses
https://www.readbyqxmd.com/read/28844774/disseminated-cryptococcal-osteomyelitis-to-the-hand-in-an-immunosuppressed-lymphoma-patient
#7
Wayne A Chen, Cynthia L Emory, Benjamin R Graves
Fungal osteomyelitis of the hand is rare with limited evidence-based literature to guide diagnosis and management. We report a case of disseminated cryptococcal osteomyelitis in the middle phalanx from a pulmonary fungal infection in a patient with a history of lymphoplasmacytic lymphoma. Although rare, cryptococcosis should be considered in the differential diagnosis of aggressive lytic lesions with bone pain and associated large soft tissue masses, especially in the immunosuppressed host.
August 25, 2017: Journal of Hand Surgery
https://www.readbyqxmd.com/read/28835663/choroid-plexitis-and-ependymitis-by-magnetic-resonance-imaging-are-biomarkers-of-neuronal-damage-and-inflammation-in-hiv-negative-cryptococcal-meningoencephalitis
#8
Dima A Hammoud, Eman Mahdi, Anil A Panackal, Paul Wakim, Virginia Sheikh, Irini Sereti, Bibi Bielakova, John E Bennett, Peter R Williamson
CNS cryptococcal meningoencephalitis in both HIV positive (HIV+) and HIV negative (HIV-) subjects is associated with high morbidity and mortality despite optimal antifungal therapy. We thus conducted a detailed analysis of the MR imaging findings in 45 HIV- and 11 HIV+ patients to identify imaging findings associated with refractory disease. Ventricular abnormalities, namely ependymitis and choroid plexitis were seen in HIV- but not in HIV+ subjects. We then correlated the imaging findings in a subset of HIV- subjects (n = 17) to CSF levels of neurofilament light chain (NFL), reflective of axonal damage and sCD27, known to best predict the presence of intrathecal T-cell mediated inflammation...
August 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28832534/transcriptional-analysis-allows-genome-reannotation-and-reveals-that-cryptococcus-gattii-vgii-undergoes-nutrient-restriction-during-infection
#9
Patrícia Aline Gröhs Ferrareze, Rodrigo Silva Araujo Streit, Patricia Ribeiro Dos Santos, Francine Melise Dos Santos, Rita Maria Cunha de Almeida, Augusto Schrank, Livia Kmetzsch, Marilene Henning Vainstein, Charley Christian Staats
Cryptococcus gattii is a human and animal pathogen that infects healthy hosts and caused the Pacific Northwest outbreak of cryptococcosis. The inhalation of infectious propagules can lead to internalization of cryptococcal cells by alveolar macrophages, a niche in which C. gattii cells can survive and proliferate. Although the nutrient composition of macrophages is relatively unknown, the high induction of amino acid transporter genes inside the phagosome indicates a preference for amino acid uptake instead of synthesis...
August 23, 2017: Microorganisms
https://www.readbyqxmd.com/read/28831671/opportunistic-invasive-mycoses-in-aids-cryptococcosis-histoplasmosis-coccidiodomycosis-and-talaromycosis
#10
REVIEW
Daniel B Chastain, Andrés F Henao-Martínez, Carlos Franco-Paredes
PURPOSE OF REVIEW: The goal of this review is to provide an update on the epidemiology, diagnosis, and treatment of opportunistic fungal infections in patients with human immunodeficiency virus (HIV) infection including Cryptococcus spp., Histoplasma spp., Coccidioides spp., and Talaromyces marneffei, formerly Penicillium marneffei. RECENT FINDINGS: In many settings, despite increasing roll out of antiretroviral therapy (ART), opportunistic invasive mycoses produce a substantial burden of disease...
August 22, 2017: Current Infectious Disease Reports
https://www.readbyqxmd.com/read/28831193/tuberculosis-cryptococcosis-co-infection-in-china-between-1965-and-2016
#11
Wenjie Fang, Lei Zhang, Jia Liu, David W Denning, Ferry Hagen, Weiwei Jiang, Nan Hong, Shuwen Deng, Xia Lei, Danqi Deng, Wanqing Liao, Jianping Xu, Teun Boekhout, Min Chen, Weihua Pan
Cases of tuberculosis/cryptococcosis co-infection are rapidly increasing in China. However, most studies addressing this co-infection have been published in Chinese journals, and this publication strategy has obscured this disease trend for scientists in other parts of the world. Our investigation found that 62.9% of all co-infection cases worldwide were reported in the Chinese population (n=197) between 1965 and 2016, and 56.3% of these Chinese cases were reported after 2010. Nearly all cases originated from the warm and wet monsoon regions of China...
August 23, 2017: Emerging Microbes & Infections
https://www.readbyqxmd.com/read/28814908/pulmonary-cryptococcosis-presenting-with-lung-mass-report-of-7-cases-and-review-of-literature
#12
Kanet Kanjanapradit, Zdravko Kosjerina, Wiwatana Tanomkiat, Warangkana Keeratichananont, Siripen Panthuwong
Pulmonary cryptococcosis is commonly found in immunocompromised patients. This microorganism rarely infects immunocompetent individuals, and when it does, it causes mild symptoms. The radiological findings of this disease may involve an intrapulmonary mass that mimics lung tumor. The objective of this study was to review the clinicopathological information, radiological findings, and treatment of patients who presented with intrapulmonary mass due to cryptococcosis. This study collected data from 7 patients who were treated at Songklanagarind Hospital, Songkhla, Thailand, between 2009 and 2014...
2017: Clinical Medicine Insights. Pathology
https://www.readbyqxmd.com/read/28793019/cryptococcus-neoformans-and-c-gattii-isolates-from-both-hiv-infected-and-uninfected-patients-antifungal-susceptibility-and-outcome-of-cryptococcal-disease
#13
Erika Nascimento, Lucia Helena Vitali, Marcia Regina von Zeska Kress, Roberto Martinez
One of the factors causing treatment failure in cryptococcosis is the resistance of Cryptococcus spp. to antifungal drugs, which has motivated the susceptibility assessment of isolates from patients with cryptococcosis, different clinical conditions and infections outcomes. Clinical isolates of Cryptococcus spp. from three different groups of patients were studied in the present investigation: 19 HIV-positive patients with relapsing and/or refractory meningitis (Group 1), 30 HIV-positive patients who experienced a single and limited episode of cryptococcosis (Group 2), and 19 HIV-negative patients with cryptococcosis (Group 3)...
2017: Revista do Instituto de Medicina Tropical de São Paulo
https://www.readbyqxmd.com/read/28792175/pleuro-pulmonary-cryptococcosis-without-pleural-effusion
#14
Kamal Gera, Nevin Kishore, Andleeb Abrari, Kanika Singh
No abstract text is available yet for this article.
July 2017: Journal of the Association of Physicians of India
https://www.readbyqxmd.com/read/28782323/disseminated-cryptococcosis-mimicking-miliary-tuberculosis-with-generalized-lymphadenopathy-in-immunocompetent-host
#15
Sompal, Manoj Gupta, Shishir Soni, Rohit Mehtani, Anil Bharani
Cryptococcosis is a rare opportunistic infection in the immunocompromised host.1,2 Diagnosis of disseminated fungal infections is rarely thought of in immunocompetent hosts. In developing countries where tuberculosis is endemic, Cryptococcosis is often misdiagnosed as tuberculosis.3,4 A 14 year old girl, misdiagnosed as miliary tuberculosis with Koch's abdomen on ATT, presented with seizures. After extensive workup, she was found to have disseminated Cryptococcosis, not tuberculosis. This case report shows the similarity in presentation of tuberculosis and Cryptococcosis, and hence Cryptococcosis should always be kept as a differential diagnosis of tuberculosis...
June 2017: Journal of the Association of Physicians of India
https://www.readbyqxmd.com/read/28776195/clinical-characteristics-and-prognosis-of-pediatric-cryptococcosis-in-beijing-children-s-hospital-2002-2014
#16
Linlin Liu, Lingyun Guo, Yue Liu, Tianming Chen, Shaoying Li, Yonghong Yang, Gang Liu
Cryptococcosis is a rare pediatric disease. The aim of the study is to describe clinical characteristics and prognosis of pediatric cryptococcosis from 2002 to 2014 in Beijing Children's Hospital. A total of 53 cases of cryptococcosis were identified, 69.8% of which were males. The mean age was 7 years. Forty-one (77.4%) patients had no underlying conditions. Fever, headache, and vomiting were the most common symptoms. The most common sites were the central nervous system (CNS), followed by the lungs. Most patients received a combination of amphotericin B and fluconazole with or without flucytosine as their initial regimen...
August 3, 2017: European Journal of Pediatrics
https://www.readbyqxmd.com/read/28774701/fungal-infections-in-hiv-aids
#17
REVIEW
Andrew H Limper, Antoine Adenis, Thuy Le, Thomas S Harrison
Fungi are major contributors to the opportunistic infections that affect patients with HIV/AIDS. Systemic infections are mainly with Pneumocystis jirovecii (pneumocystosis), Cryptococcus neoformans (cryptococcosis), Histoplasma capsulatum (histoplasmosis), and Talaromyces (Penicillium) marneffei (talaromycosis). The incidence of systemic fungal infections has decreased in people with HIV in high-income countries because of the widespread availability of antiretroviral drugs and early testing for HIV. However, in many areas with high HIV prevalence, patients present to care with advanced HIV infection and with a low CD4 cell count or re-present with persistent low CD4 cell counts because of poor adherence, resistance to antiretroviral drugs, or both...
July 31, 2017: Lancet Infectious Diseases
https://www.readbyqxmd.com/read/28756537/atypical-morphology-and-disparate-speciation-in-a-case-of-feline-cryptococcosis
#18
S J M Evans, K Jones, A R Moore
A 6-year-old, spayed female cat was presented with acute respiratory signs and pleural effusion. Computed tomography scan revealed a large, lobulated mass effect in the ventral right hemithorax with concurrent sternal lymphadenopathy. A cytologic sample of the mass contained pyogranulomatous inflammation, necrotic material, and abundant yeast structures that lacked a distinct capsule and demonstrated rare pseudohyphal forms. Fungal culture and biochemical testing identified the yeast as Cryptococcus albidus, with susceptibility to all antifungal agents tested...
July 29, 2017: Mycopathologia
https://www.readbyqxmd.com/read/28750078/acridine-orange-fluorescent-microscopy-is-more-sensitive-than-india-ink-light-microscopy-in-the-rapid-detection-of-cryptococcosis-among-crag-positive-hiv-patients
#19
Richard Kwizera, Andrew Akampurira, Darlisha Williams, David R Boulware, David B Meya
BACKGROUND: India ink microscopy on cerebrospinal fluid is still utilized in resource limited settings for the diagnosis of cryptococcal meningitis despite its poor sensitivity. We hypothesized that staining fungal nucleic acids with fluorescent dyes instead of the capsule with India ink might improve sensitivity for the diagnosis of cryptococcal meningitis. METHODS: We enrolled 96 HIV-infected participants with cryptococcal meningitis who provided 194 CSF specimens at serial time points in Kampala, Uganda...
2017: PloS One
https://www.readbyqxmd.com/read/28744276/differential-antifungal-activity-of-human-and-cryptococcal-melanins-with-structural-discrepancies
#20
Néstor Correa, Cristian Covarrubias, Paula I Rodas, Germán Hermosilla, Verónica R Olate, Cristián Valdés, Wieland Meyer, Fabien Magne, Cecilia V Tapia
Melanin is a pigment found in all biological kingdoms, and plays a key role in protection against ultraviolet radiation, oxidizing agents, and ionizing radiation damage. Melanin exerts an antimicrobial activity against bacteria, fungi, and parasites. We demonstrated an antifungal activity of synthetic and human melanin against Candida sp. The members of the Cryptococcus neoformans and C. gattii species complexes are capsulated yeasts, which cause cryptococcosis. For both species melanin is an important virulence factor...
2017: Frontiers in Microbiology
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