Initial characterization of CST1, a Toxoplasma gondii cyst wall glycoprotein

Y. W. Zhang, S. K. Halonen, Yan Fen Ma, M. Wittner, Louis M. Weiss

Research output: Contribution to journalArticle

65 Citations (Scopus)

Abstract

Toxoplasma gondii is an important protozoan pathogen of humans that can cause encephalitis in immunocompromised individuals such as those with AIDS. This encephalitis is due to reactivation of latent infection in T. gondii-seropositive patients. Latent organisms survive within tissue cysts, which are specialized parasitophorous vacuoles containing bradyzoites. The cyst wall of this structure is produced by modification of the parasitophorous vacuole by the parasite and is important in cyst survival. The components of the cyst wall have been poorly characterized. By using immunofluorescence and immunoelectron microscopy, we have identified a monoclonal antibody (MAb 93.18) that reacts with the cyst wall. This antibody recognizes a 116-kDa glycoprotein, which we have termed CST1, containing sugar residues that bind Dolichos biflorans lectin (DBA). CST1 is distinct from T. gondii antigen labeled with succinyl Triticum vulgare lectin (S-WGA) and represents the major DBA-binding component in T. gondii. The carbohydrate components of the tissue cyst, such as CST1, are probably important in both providing stability and facilitating persistence in its host. As is seen in the carbohydrate capsules of fungi, glycoproteins in the T. gondii cyst wall may protect cysts from the immune response of the host. Further characterization of the formation of the cyst wall and its components should lead to insights into the mechanism of tissue cyst persistence and may suggest novel therapeutic approaches to eliminate tissue cysts of this organism.

Original languageEnglish (US)
Pages (from-to)501-507
Number of pages7
JournalInfection and Immunity
Volume69
Issue number1
DOIs
StatePublished - 2001

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Toxoplasma
Cysts
Glycoproteins
Dolichos
Encephalitis
Vacuoles
Lectins
Carbohydrates
Wheat Germ Agglutinins
Immunoelectron Microscopy
Viral Tumor Antigens
Toxoplasmosis
Fluorescence Microscopy
Capsules
Parasites
Acquired Immunodeficiency Syndrome
Fungi
Monoclonal Antibodies

ASJC Scopus subject areas

  • Immunology

Cite this

Initial characterization of CST1, a Toxoplasma gondii cyst wall glycoprotein. / Zhang, Y. W.; Halonen, S. K.; Ma, Yan Fen; Wittner, M.; Weiss, Louis M.

In: Infection and Immunity, Vol. 69, No. 1, 2001, p. 501-507.

Research output: Contribution to journalArticle

Zhang, Y. W. ; Halonen, S. K. ; Ma, Yan Fen ; Wittner, M. ; Weiss, Louis M. / Initial characterization of CST1, a Toxoplasma gondii cyst wall glycoprotein. In: Infection and Immunity. 2001 ; Vol. 69, No. 1. pp. 501-507.
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