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© Research
Publication : Journal of immunology (Baltimore, Md. : 1950)

Vaccination with phosphoglycan-deficient Leishmania major protects highly susceptible mice from virulent challenge without inducing a strong Th1 response

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Journal of immunology (Baltimore, Md. : 1950) - 15 Mar 2004

Uzonna JE, Späth GF, Beverley SM, Scott P

Link to Pubmed [PMID] – 15004184

J. Immunol. 2004 Mar;172(6):3793-7

Long-term immunity to Leishmania may require the continued presence of parasites, but previous attempts to create attenuated parasites that persist without causing disease have had limited success. Since Leishmania major mutants that lack lipophosphoglycan and other secreted phosphoglycans, termed lpg2-, persist indefinitely in infected mice without inducing any disease, we tested their ability to provide protection to virulent L. major challenge. In response to leishmanial Ag stimulation, cells from lpg2–infected mice produced minimal levels of IL-4 and IL-10, as well as very low levels of IFN-gamma. Nevertheless, when BALB/c mice infected with lpg2- parasites were challenged with virulent L. major they were protected from disease. Thus, these findings report on attenuated parasites that may be used to induce long-term protection against leishmaniasis and indicate that the immunity induced can be maintained in the absence of a strong Th1 response.

http://www.ncbi.nlm.nih.gov/pubmed/15004184