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Leishmania major LACK antigen is required for efficient vertebrate parasitization
Ben L Kelly1, Daniel B Stetson, Richard M Locksley
1Howard Hughes Medical Institute, Department of Medicine, University of California San Francisco, San Francisco, CA 94143, USA.
The Journal of Experimental Medicine
|December 6, 2003
Summary
The Leishmania major LACK antigen is crucial for parasite survival and infection in mice. Reducing LACK gene copies impairs parasite growth in mammals, highlighting LACK as a potential drug target for leishmaniasis.
Area of Science:
- Immunology
- Parasitology
- Molecular Biology
Background:
- The Leishmania major LACK antigen is a key immune target in leishmaniasis.
- LACK is a potential vaccine candidate for human leishmaniasis.
Purpose of the Study:
- To investigate the genomic organization of LACK genes in L. major.
- To determine the role of LACK in parasite infectivity and viability.
Main Methods:
- Gene targeting of LACK in L. major.
- In vitro culture of promastigotes and amastigotes.
- Infection studies in BALB/c mice (including T cell-deficient models).
- Complementation studies.
Main Results:
- Single-copy LACK mutants showed reduced parasitic ability in BALB/c mice.
- Amastigote replication was attenuated in vitro and in vivo.
- Complementation restored lesion development, indicating LACK's role in pathogenesis.
- LACK-null mutants could not be generated, suggesting essentiality for parasite viability.
Conclusions:
- LACK is critical for Leishmania major mammalian parasitization.
- LACK is essential for parasite viability.
- LACK represents a potential drug target for treating leishmaniasis.