Parasites, Hosts and Diseases

"Pneumocystis carinii"

Original Articles

Parasitic infections in HIV-infected patients who visited Seoul National University Hospital during the period 1995-2003: Sang-Mee Guk, Min Seo, Yun-Kyu Park, Myoung-Don Oh, Kang-Won Choe, Jae-Lip Kim, Min-Ho Choi, Sung-Tae Hong, Jong-Yil Chai; Korean J Parasitol 2005;43(1):1-5.
Published online March 20, 2005; DOI: https://doi.org/10.3347/kjp.2005.43.1.1

Abstract
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The prevalence of parasitic infections was investigated in human immunodeficiency virus (HIV)-infected patients (n = 105) who visited Seoul National University Hospital, Seoul, Korea, during the period from 1995 to 2003. Fecal samples were collected from 67 patients for intestinal parasite examinations, and sputum or bronchoalveolar lavage samples from 60 patients for examination of Pneumocystis carinii. Both samples were obtained from 22 patients. Thirty-three (31.4%) of the 105 were found to have parasitic infections; Cryptosporidium parvum (10.5%; 7/67), Isospora belli (7.5%; 5/67), Clonorchis sinensis (3.0%; 2/67), Giardia lamblia (1.5%; 1/67), Gymnophalloides seoi (1.5%; 1/67), and Pneumocystis carinii (28.3%; 17/60). The hospital records of the 11 intestinal parasite-infected patients showed that all suffered from diarrhea. This study shows that parasitic infections are important clinical complications in HIV-infected patients in the Republic of Korea.

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Localization of cytoskeletal proteins in Pneumocystis carinii by immuno-electron microscopy: Jae-Ran Yu, Jae-Kyong Pyon, Min Seo, Byung-Suk Jung, Sang Rock Cho, Soon-Hyung Lee, Sung-Tae Hong; Korean J Parasitol 2001;39(1):13-21.
Published online March 31, 2001; DOI: https://doi.org/10.3347/kjp.2001.39.1.13

Abstract
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Pneumocystis carinii causes serious pulmonary infection in immunosuppressed patients. This study was undertaken to observe the cytoskeletal proteins of P. carinii by immuno-electron microscopy. P. carinii infection was experimentally induced by immunosuppression of Sprague-Dawley rats for seven weeks, and their lungs were used for the observations of this study. The gold particles localized actin, tropomyosin, and tubulin. The actin was irregularly scattered in the cytoplasm of the trophic forms but was much more concentrated in the inner space of the cell wall of the cystic forms called the inner electron-lucent layer. No significant amount of tropomyosin was observed in either trophic forms or cystic forms. The tubulin was distributed along the peripheral cytoplasm and filopodia of both the trophic and cystic forms rather than in the inner side of the cytoplasm. Particularly, in the cystic forms, the amount of tubulin was increased and located mainly in the inner electron-lucent layer of the cell wall where the actin was concentrated as well. The results of this study showed that the cell wall of P. carinii cystic forms is a structure whose inner side is rich in actin and tubulin. The location of the actin and tubulin in P. carinii suggests that the main role of these proteins is an involvement in the protection of cystic forms from the outside environment by maintaining rigidity of the cystic forms.

Citations

Citations to this article as recorded by

A Molecular Window into the Biology and Epidemiology of Pneumocystis spp
Liang Ma, Ousmane H. Cissé, Joseph A. Kovacs
Clinical Microbiology Reviews.2018;[Epub] CrossRef