Full Text Journal Articles by
Author Peter M Takvorian

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Invasion of Host Cells by Microsporidia.

Bing Han, Peter M Takvorian, Louis M Weiss,

Microsporidia are found worldwide and both vertebrates and invertebrates can serve as hosts for these organisms. While microsporidiosis in humans can occur in both immune competent and immune compromised hosts, it has most often been seen in the immune suppressed population, e.g., patients with advanced HIV infection, patients who have ... Read more >>

Front Microbiol (Frontiers in microbiology)
[2020, 11:172]

Cited: 0 times

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An Ultrastructural Study of the Extruded Polar Tube of Anncaliia algerae (Microsporidia).

Peter M Takvorian, Bing Han, Ann Cali, William J Rice, Leslie Gunther, Frank Macaluso, Louis M Weiss,

All microsporidia share a unique, extracellular spore stage, containing the infective sporoplasm and the apparatus for initiating infection. The polar filament/polar tube when exiting the spore transports the sporoplasm through it into a host cell. While universal, these structures and processes have been enigmatic. This study utilized several types of ... Read more >>

J. Eukaryot. Microbiol. (The Journal of eukaryotic microbiology)
[2020, 67(1):28-44]

Cited: 0 times

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A Novel Fluorescent Labeling Method Enables Monitoring of Spatio-Temporal Dynamics of Developing Microsporidia.

Marianita Santiana, Peter M Takvorian, Nihal Altan-Bonnet, Ann Cali,

The microsporidium, Anncaliia algerae (Brachiola algerae), is a eukaryotic obligate intracellular parasite first isolated from mosquitoes and is an important opportunistic human pathogen that can cause morbidity and mortality among immune-compromised individuals including patients with AIDS and those undergoing chemotherapy. There is little known about the Microsporidia-host cell interface in ... Read more >>

J. Eukaryot. Microbiol. (The Journal of eukaryotic microbiology)
[2016, 63(3):318-325]

Cited: 2 times

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Analysis of the beta-tubulin gene and morphological changes of the microsporidium Anncaliia algerae both suggest albendazole sensitivity.

Marianita Santiana, Cyrilla Pau, Peter M Takvorian, Ann Cali,

The Microsporidium, Anncaliia algerae, an obligate intracellular parasite, has been identified as an opportunistic human pathogen, but treatment has not been evaluated for infections with this organism. Albendazole, an antitubulin polymerization drug used against parasitic worm infections, has been the medication of choice used to treat some microsporidial infections affecting ... Read more >>

J. Eukaryot. Microbiol. (The Journal of eukaryotic microbiology)
[2015, 62(1):60-68]

Cited: 4 times

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A new intranuclear microsporidium, Enterospora nucleophila n. sp., causing an emaciative syndrome in a piscine host (Sparus aurata), prompts the redescription of the family Enterocytozoonidae.

Oswaldo Palenzuela, María José Redondo, Ann Cali, Peter M Takvorian, María Alonso-Naveiro, Pilar Alvarez-Pellitero, Ariadna Sitjà-Bobadilla,

The presence of a new microsporidium is believed to be responsible for an emaciative syndrome observed in farmed gilthead sea bream (Sparus aurata) from different facilities along the Spanish coast. Infected fish were approximately half the average weight and significant mortality was attributed to the condition in some facilities. Clinical ... Read more >>

Int. J. Parasitol. (International journal for parasitology)
[2014, 44(3-4):189-203]

Cited: 8 times

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Ichthyosporidium weissii n. sp. (Microsporidia) infecting the arrow goby (Clevelandia ios).

Justin Sanders, Mark S Myers, Lars Tomanek, Ann Cali, Peter M Takvorian, Michael L Kent,

Gonadal infections by a novel microsporidium were discovered in 34% (13/38) of arrow gobies, Clevelandia ios, sampled over a 3-yr period from Morro Bay Marina in Morro Bay, California. Gonadal tumors had been reported in arrow gobies from this geographic area. The infected gonads, found primarily in females, typically appeared ... Read more >>

J. Eukaryot. Microbiol. (The Journal of eukaryotic microbiology)
[2012, 59(3):258-267]

Cited: 2 times

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Development, ultrastructural pathology, and taxonomic revision of the Microsporidial genus, Pseudoloma and its type species Pseudoloma neurophilia, in skeletal muscle and nervous tissue of experimentally infected zebrafish Danio rerio.

Ann Cali, Michael Kent, Justin Sanders, Cyrilla Pau, Peter M Takvorian,

The microsporidium Pseudoloma neurophilia was initially reported to infect the central nervous system of zebrafish causing lordosis and eventually death. Subsequently, muscle tissue infections were also identified. To understand the infection process, development, and ultrastructural pathology of this microsporidium, larval and adult zebrafish were fed P. neurophilia spores. Spores were ... Read more >>

J. Eukaryot. Microbiol. (The Journal of eukaryotic microbiology)
[2012, 59(1):40-48]

Cited: 7 times

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Human vocal cord infection with the Microsporidium Anncaliia algerae.

Ann Cali, Ronald Neafie, Louis M Weiss, Kaya Ghosh, Rebecca B Vergara, Rachna Gupta, Peter M Takvorian,

We describe a biopsy proven case of microsporidial infection of the false vocal cords in a 69-yr-old male with a history of chronic lymphocytic leukemia. The patient had hoarseness for several weeks before his admission to the hospital for shortness of breath. He had received chemotherapy with fludarabine 6 wk ... Read more >>

J. Eukaryot. Microbiol. (The Journal of eukaryotic microbiology)
[2010, 57(6):562-567]

Cited: 11 times

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Viral reorganization of the secretory pathway generates distinct organelles for RNA replication.

Nai-Yun Hsu, Olha Ilnytska, Georgiy Belov, Marianita Santiana, Ying-Han Chen, Peter M Takvorian, Cyrilla Pau, Hilde van der Schaar, Neerja Kaushik-Basu, Tamas Balla, Craig E Cameron, Ellie Ehrenfeld, Frank J M van Kuppeveld, Nihal Altan-Bonnet,

Many RNA viruses remodel intracellular membranes to generate specialized sites for RNA replication. How membranes are remodeled and what properties make them conducive for replication are unknown. Here we show how RNA viruses can manipulate multiple components of the cellular secretory pathway to generate organelles specialized for replication that are ... Read more >>

Cell (Cell)
[2010, 141(5):799-811]

Cited: 319 times

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Distinct localization patterns of two putative mitochondrial proteins in the microsporidian Encephalitozoon cuniculi.

Bryony A P Williams, Ann Cali, Peter M Takvorian, Patrick J Keeling,

Microsporidia were once considered amitochondriate, but have now been found to retain relict mitochondria called mitosomes. These organelles have been identified by immunolocalization in Trachipleistophora hominis, whereas most data on function have been inferred from the presence of mitochondrial protein-encoding sequences in the genome of Encephalitozoon cuniculi. Here we describe ... Read more >>

J. Eukaryot. Microbiol. (The Journal of eukaryotic microbiology)
[2008, 55(2):131-133]

Cited: 11 times

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Functional characterization of a putative aquaporin from Encephalitozoon cuniculi, a microsporidia pathogenic to humans.

Kaya Ghosh, Clint D Cappiello, Sean M McBride, James L Occi, Ann Cali, Peter M Takvorian, Thomas V McDonald, Louis M Weiss,

The microsporidia are a group of obligate intracellular parasitic protists that have been implicated as both human and veterinary pathogens. The infectious process of these organisms is believed to be dependent upon the rapid influx of water into spores, presumably via aquaporins (AQPs), transmembrane channels that facilitate osmosis. An AQP-like ... Read more >>

Int. J. Parasitol. (International journal for parasitology)
[2006, 36(1):57-62]

Cited: 14 times

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A review of the development of two types of human skeletal muscle infections from microsporidia associated with pathology in invertebrates and cold-blooded vertebrates.

Ann Cali, Louis M Weiss, Peter M Takvorian,

Traditionally, the Microsporidia were primarily studied in insects and fish. There were only a few human cases of microsporidiosis reported until the advent of AIDS, when the number of human microsporidian infections dramatically increased and the importance of these new pathogens to medicine became evident. Over a dozen different kinds ... Read more >>

Folia Parasitol. (Folia parasitologica)
[2005, 52(1-2):51-61]

Cited: 13 times

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Heterologous expression of an Encephalitozoon cuniculi aquaporin in Xenopus oocytes.

Kaya Ghosh, Peter M Takvorian, Sean M McBride, Ann Cali, Louis M Weiss,

J. Eukaryot. Microbiol. (The Journal of eukaryotic microbiology)
[2006, 53 Suppl 1:S72-3]

Cited: 3 times

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High-voltage electron microscopy and computerized tomography: new approaches to study microsporidian spore internal organization.

Peter M Takvorian, Karolyn F Buttle, Carmen A Mannella, Louis M Weiss, Ann Cali,

J. Eukaryot. Microbiol. (The Journal of eukaryotic microbiology)
[2006, 53 Suppl 1:S55-7]

Cited: 1 time

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The early events of Brachiola algerae (Microsporidia) infection: spore germination, sporoplasm structure, and development within host cells.

Peter M Takvorian, Louis M Weiss, Ann Cali,

Brachiola algerae (Vavra et Undeen, 1970) Lowman, Takvorian et Cali, 2000, originally isolated from a mosquito, has been maintained in rabbit kidney cells at 29 degrees C in our laboratory. This culture system has made it possible to study detailed aspects of its development, including spore activation, polar tube extrusion, ... Read more >>

Folia Parasitol. (Folia parasitologica)
[2005, 52(1-2):118-129]

Cited: 9 times

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Investigations into microsporidian methionine aminopeptidase type 2: a therapeutic target for microsporidiosis.

Hong Zhang, Huan Huang, Ann Cali, Peter M Takvorian, Xiaochuan Feng, Ghou Zhou, Louis M Weiss,

The Microsporidia have been reported to cause a wide range of clinical diseases particularly in patients that are immunosuppressed. They can infect virtually any organ system and cases of gastrointestinal infection, encephalitis, ocular infection, sinusitis, myositis and disseminated infection are well described in the literature. While benzimidazoles such as albendazole ... Read more >>

Folia Parasitol. (Folia parasitologica)
[2005, 52(1-2):182-192]

Cited: 14 times

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Fatal myositis due to the microsporidian Brachiola algerae, a mosquito pathogen.

Christina M Coyle, Louis M Weiss, Luther V Rhodes, Ann Cali, Peter M Takvorian, Daniel F Brown, Govinda S Visvesvara, Lihua Xiao, Jaan Naktin, Eric Young, Marcelo Gareca, Georgia Colasante, Murray Wittner,

N. Engl. J. Med. (The New England journal of medicine)
[2004, 351(1):42-47]

Cited: 58 times

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An analysis of the microsporidian genus Brachiola, with comparisons of human and insect isolates of Brachiola algerae.

Ann Cali, Louis M Weiss, Peter M Takvorian,

The genus Brachiola is the newest microsporidian genus established for a human infection with the type species being B. vesicularum in skeletal muscle. Subsequently, the microsporidium, Nosema algerae, identified from mosquitoes, was added to this genus because of morphological and physiological similarities. The present report illustrates a confirmed case of ... Read more >>

J. Eukaryot. Microbiol. (The Journal of eukaryotic microbiology)
[2004, 51(6):678-685]

Cited: 12 times

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Ultrastructure and development of Pleistophora ronneafiei n. sp., a microsporidium (Protista) in the skeletal muscle of an immune-compromised individual.

Ann Cali, Peter M Takvorian,

This report provides a detailed ultrastructural study of the life cycle, including proliferative and sporogonic developmental stages, of the first Pleistophora species (microsporidium) obtained from an immune-incompetent patient. In 1985, the organism obtained from a muscle biopsy was initially identified as belonging to the genus Pleistophora, based on spore morphology ... Read more >>

J. Eukaryot. Microbiol. (The Journal of eukaryotic microbiology)
[2003, 50(2):77-85]

Cited: 24 times

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Brachiola algerae spore membrane systems, their activity during extrusion, and a new structural entity, the multilayered interlaced network, associated with the polar tube and the sporoplasm.

Ann Cali, Louis M Weiss, Peter M Takvorian,

The microsporidial genus, Brachiola, contains three species: the type species Brachiola vesicularum (identified from an AIDS patient) and two species transferred from the genus Nosema, becoming Brachiola connori and Brachiola algerae. A developmental feature of the genus Brachiola is the "thickened" plasmalemma from sporoplasm through sporoblast stage. The sporoplasm has ... Read more >>

J. Eukaryot. Microbiol. (The Journal of eukaryotic microbiology)
[2002, 49(2):164-174]

Cited: 17 times

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