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Goblet cells: are they an unspecific barrier against Giardia intestinalis or a gate?

Abstract

Giardiosis is one of the major intestinal parasitic diseases of human beings as well as wild and domesticated animals. Several protective mechanisms against infection have been described. However, specific information about relationship between giardiosis and the increased proliferation of goblet cells (GC) in patients infected with Giardia intestinalis (Syn. G. duodenalis, G. lamblia) is scarce. In this work, we compare and quantify the number of GC, and have inferred their metabolic state in the small intestine of dogs parasitized with Giardia intestinalis compared to dogs without parasites. Small intestine segments were processed using routine methods for histology and electron microscopy; areas and cells were screened with an Axiovision Ver. 4.0 system. Data were analyzed by ANOVA and comparison of averages. Parasitized dogs showed higher GC numbers than nonparasitized ones. Averages were: 20 ± 0.81 GC/25 μm2 with independent mucin granules and 11 ± 1.53 GC/25 μm2 that were expelling mucus, compared to 11 ± 0.94 GC/25 μm2 and 1 ± 0.27 GC/25 μm2, respectively, in nonparasitized dogs (Tukey, p < 0.001). The increases in GC number seem to be an unspecific defensive mechanism against Giardia trophozoites. However, we found some evidence supporting that GC hyperplasia could be a prejudicial to epithelial barrier that gives rise to gates allowing for Giardia-tissue invasion.

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Acknowledgement

The authors are grateful to Dr. Silvestre Frenk for critical commentary on the manuscript.

Author information

Correspondence to Mario N. Martínez-Gordillo.

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Ponce-Macotela, M., González-Maciel, A., Reynoso-Robles, R. et al. Goblet cells: are they an unspecific barrier against Giardia intestinalis or a gate?. Parasitol Res 102, 509–513 (2008). https://doi.org/10.1007/s00436-007-0790-6

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Keywords

  • Giardia intestinalis
  • Giardiosis
  • Goblet cells
  • Mucins
  • Histopathology
  • Giardia-tissue invasion