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Preparation of Quality Inositol Pyrophosphates
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Published on: September 3, 2011

Chemical synthesis and immunosuppressive activity of dipalmitoyl phosphatidylinositol hexamannoside

Gary D Ainge1, Benjamin J Compton, Colin M Hayman

  • 1Carbohydrate Chemistry Team, Industrial Research Limited, PO Box 31-310, Lower Hutt, New Zealand.

The Journal of Organic Chemistry
|May 18, 2011
PubMed

Insights

Researchers synthesized a synthetic phosphatidylinositol hexamannoside (PIM(6)) and demonstrated its immune-modulating properties. This synthetic PIM(6) suppressed T cell expansion, mirroring the effects of mycobacteria.

Area of Science:

  • Organic Chemistry
  • Immunology
  • Glycobiology

Background:

  • Phosphatidylinositol mannosides (PIMs) from mycobacteria are key phosphoglycolipids with immune-modulating effects.
  • Understanding PIMs' structure-activity relationship is crucial for developing immunotherapies.

Purpose of the Study:

  • To synthesize dipalmitoyl phosphatidylinositol hexamannoside (PIM(6)) and evaluate its biological function.
  • To confirm the identity of synthetic PIM(6) against naturally derived compounds.

Main Methods:

  • Selective glycosylation of inositol with a mannosyl donor.
  • Glycan core construction using a [3 + 4] thio-glycosylation strategy.
  • Purification by reverse-phase chromatography and characterization via NMR, HPLC, and deacylation.

Main Results:

  • Successful synthesis and purification of synthetic PIM(6) (1).
  • Characterization confirmed the identity of synthetic dPIM(6) by matching NMR spectra with natural dPIM(6).
  • Synthetic PIM(6) demonstrated dendritic cell-dependent suppression of CD8(+) T cell expansion in a human mixed lymphocyte reaction.

Conclusions:

  • The synthesis of PIM(6) provides a crucial tool for studying its biological roles.
  • Synthetic PIM(6) exhibits immunosuppressive activity, consistent with known mycobacterial effects.
  • This work facilitates further investigation into PIMs as immunomodulators.

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