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. 1991 Oct;29(10):2305–2312. doi: 10.1128/jcm.29.10.2305-2312.1991

Glycoinositol phospholipids from American Leishmania and Trypanosoma spp: partial characterization of the glycan cores and the human humoral immune response to them.

J L Avila 1, M Rojas 1, A Acosta 1
PMCID: PMC270318  PMID: 1719024

Abstract

The glycoinositol phospholipid (GIPL) profiles of American Leishmania spp. (L. mexicana and L. braziliensis), Leishmania donovani, and American Trypanosoma spp. (T. cruzi and T. rangeli) were compared. The major GIPLs in these parasites include tetraglycosyl-, pentaglycosyl-, and hexaglycosylphosphatidylinositol. These were partially identified by their comigration by high-performance thin-layer chromatography with purified L. major GIPLs, gas-liquid chromatography of the monosaccharides released after aqueous HF treatment, N-acetylation and methanolysis, sensitivity to exoglycosidases, and antibody absorption on several specific natural haptens. Members of the genus Leishmania have two other highly polar glycolipids, while the T. rangeli glycolipid profile was quite different from those of other kinetoplastids that were studied. On a weight basis, the glycan core of L. major GIPL-1 is the most reactive, followed by GIPL-3 and GIPL-2. Antibodies to the core glycans of GIPL-1, GIPL-2, and GIPL-3 were present at a low titer in the serum of every normal individual studied, while elevated GIPL-2 antibody levels were present in 80 to 100% of T. cruzi-, T. rangeli-, or L. donovani-infected patients, with lower values being found for GIPL-3 (30 to 60%) and GIPL-1 (30 to 50%). Except for GIPL-2 antibodies, which were mainly located on immunoglobulin G (IgG) and IgM, GIPL-1 and GIPL-3 antibodies were mainly distributed in IgM, with lower reactivity present in IgG. Antigen-antibody binding was very selectively blocked with Gal(alpha 1-3)Man, or Gal(beta 1-4)Man, Gal(alpha 1-3)Gal, and Gal(alpha 1-6)Gal for GIPL-1, GIPL-2, and GIPL-3 antibodies, respectively.

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Selected References

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