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The major surface glycoprotein (GP63) is present in both life stages of Leishmania
T O Frommel1, L L Button, Y Fujikura
1Department of Medical Genetics, University of British Columbia, Vancouver, Canada.
Abstract:
Leishmania exist as extracellular promastigotes which multiply in the gut of the sandfly insect vector and as intracellular amastigotes which divide in the phagolysosome of mononuclear phagocytic cells of the mammalian host. Promastigotes express a major surface glycoprotein of 63 kDa, referred to as GP63. The expression of GP63 in both Leishmania life stages was studied using rabbit antibodies against native GP63 as well as rabbit antibodies against recombinant GP63 that was synthesized in an Escherichia coli expression system. Immunofluorescence staining detected GP63 in intracellular amastigotes contained within a macrophage cell line and within freshly isolated lesion amastigotes. Western blot analysis using anti-recombinant GP63 antibodies also demonstrated that amastigotes synthesize GP63 which may undergo differential post-translational processing as compared to promastigote GP63.
Insights
Leishmania parasites express the surface glycoprotein GP63 in both their promastigote and amastigote forms. This study confirms GP63 expression in intracellular amastigotes, suggesting differential processing between life stages.
Area of Science:
- Parasitology
- Molecular Biology
- Immunology
Background:
- Leishmania parasites alternate between extracellular promastigote and intracellular amastigote stages.
- The surface glycoprotein GP63 is a major virulence factor expressed by Leishmania promastigotes.
Purpose of the Study:
- To investigate the expression of GP63 in both life stages of Leishmania.
- To determine if amastigotes synthesize GP63 and if its post-translational processing differs from promastigotes.
Main Methods:
- Immunofluorescence staining of Leishmania within macrophages.
- Western blot analysis using antibodies against native and recombinant GP63.
- Synthesis of recombinant GP63 in Escherichia coli.
Main Results:
- GP63 was detected in intracellular amastigotes using immunofluorescence.
- Western blot analysis confirmed GP63 synthesis in amastigotes.
- Evidence suggests differential post-translational processing of GP63 between promastigotes and amastigotes.
Conclusions:
- GP63 is expressed in both extracellular promastigote and intracellular amastigote stages of Leishmania.
- Amastigote GP63 may undergo distinct post-translational modifications compared to promastigote GP63.
- This finding has implications for understanding Leishmania pathogenesis and host-parasite interactions.