AI Article Synopsis
- Leishmanolysin (GP63), a surface metalloproteinase in Leishmania, is identified as a key virulence factor that aids in the interaction between the parasite and host immune cells.
- By deleting the genes responsible for leishmanolysin, researchers created mutants of Leishmania major that developed normally in sand flies but showed increased vulnerability to the host's immune response and delayed lesion formation in infected animals.
- Complementing these mutants with a leishmanolysin gene restored some normal functions, highlighting its essential role in the virulence and pathogenicity of Leishmania.
Article Abstract
Leishmanolysin, the Leishmania surface metalloproteinase of 63 kDa (GP63) has been described as a parasite virulence factor and is involved in the direct interaction of promastigotes and host macrophage receptors and interaction with the complement cascade. To study the role of leishmanolysin in the pathogenesis and virulence of Leishmania major, targeted gene replacement was used to delete the entire 20 kb region containing all seven leishmanolysin genes (gp63 genes 1-7). The resulting L. major leishmanolysin deficient mutants showed normal development inside the sand fly vector, however, promastigotes recovered from sand flies or from culture showed an increase in sensitivity to complement-mediated lysis and a delay in lesion formation in BALB/c animals. The phenotypic differences could be significantly improved by expression of a cloned leishmanolysin gene. These results demonstrate that leishmanolysin is a vital virulence factor in Leishmania pathogenesis.
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| http://dx.doi.org/10.1016/s0166-6851(01)00432-7 | DOI Listing |
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