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Area of Science:

  • Parasitology
  • Molecular Biology
  • Zoonotic Diseases

Background:

  • Alveolar echinococcosis is a lethal zoonosis caused by the Echinococcus multilocularis tapeworm metacestode.
  • Parasite larval establishment in the liver is followed by tumor-like growth, with mechanisms of organ tropism and hormonal influence poorly understood.

Purpose of the Study:

  • To investigate the role of host insulin in the proliferation and development of Echinococcus multilocularis metacestodes.
  • To identify and characterize the insulin signaling pathway components in E. multilocularis.

Main Methods:

  • In vitro cultivation of parasite larvae.
  • Stimulation with human insulin and insulin receptor inhibitors.
  • Analysis of glucose uptake, protein phosphorylation, gene expression, and protein interactions (yeast two-hybrid).

Main Results:

  • Physiological concentrations of human insulin significantly stimulate metacestode formation and asexual growth.
  • Insulin increases glucose uptake and activates parasite insulin signaling components, including EmIR1 and EmIR2.
  • Inhibition of insulin receptors leads to metacestode killing and prevents development.

Conclusions:

  • Host insulin acts as a key stimulant for parasite development in the liver via a conserved insulin signaling pathway.
  • Hormonal cross-communication between host and parasite is crucial for alveolar echinococcosis pathology.
  • Echinococcus insulin signaling pathways represent promising targets for novel therapeutic interventions.