Hostname: page-component-cd9895bd7-hc48f Total loading time: 0 Render date: 2024-12-18T21:04:16.041Z Has data issue: false hasContentIssue false
  • English
  • Français

Identification and characterization of an excretory–secretory product from Giardia lamblia

Published online by Cambridge University Press:  26 November 2001

H. KAUR ,
S. GHOSH ,
H. SAMRA ,
V. K. VINAYAK  and
N. K. GANGULY
H. KAUR
Affiliation:
Department of Experimental Medicine and Biotechnology, Postgraduate Institute of Medical Education and Research, Chandigarh 160 012 India
S. GHOSH
Affiliation:
Department of Experimental Medicine and Biotechnology, Postgraduate Institute of Medical Education and Research, Chandigarh 160 012 India
H. SAMRA
Affiliation:
Department of Experimental Medicine and Biotechnology, Postgraduate Institute of Medical Education and Research, Chandigarh 160 012 India
V. K. VINAYAK
Affiliation:
Department of Biotechnology, Govt. of India, New Delhi, India
N. K. GANGULY
Affiliation:
Department of Experimental Medicine and Biotechnology, Postgraduate Institute of Medical Education and Research, Chandigarh 160 012 India
Get access Rights & Permissions [Opens in a new window]

Abstract

A 58 kDa excretory–secretory product (ESP) of Giardia lamblia has been characterized. The ESP was purified over 508-fold by a combination of ammonium sulphate precipitation and sequential chromatography on affinity matrix and a gel filtration column. The homogeneity of the purified protein was established by sodium dodecyl sulphate polyacrylamide gel electrophoresis (Mr, 58 kDa) and analytical isoelectrophoresis (pI 4·75). The purified protein was recognized by the pooled sera of G. lamblia-positive patients as well as an antiserum raised against crude Giardia extract, thus indicating it to be an immunodominant parasite product. The ESP was found to agglutinate rabbit erythrocytes. The haemagglutinating activity of this protein was inhibited strongly by thyroglobulin, fetuin, asialofetuin and monosialoganglioside but not by simple sugars. The purified protein was characterized immunochemically and was found to be heat stable as well as protease sensitive. Lectin-binding studies of the purified ESP and its sensitivity to periodic-acid silver staining as well as to metaperiodate treatment clearly indicated its glycoprotein nature. The major localization site of the ESP was found to be on the surface of the parasite as revealed by flow cytometric analysis. Further, this glycoprotein induced fluid accumulation in ligated rabbit ileal loops and revealed a positive skin permeability reaction in the rabbit.

Keywords

Giardia lambliapurified excretory–secretory product (ESP)immunodominant ESPglycoproteinhaemagglutinintoxin
Type
Research Article
Information
Parasitology , Volume 123 , Issue 4 , October 2001 , pp. 347 - 356
Copyright
2001 Cambridge University Press

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)