Title:The Role of Purinergic Signaling in Trichomonas vaginalis Infection
Volume: 21
Issue: 3
Author(s): Micheli Ferla and Tiana Tasca*
Affiliation:
- Research Team on Trichomonas, Pharmaceutical Sciences Graduation Program, Faculty of Pharmacy, Federal University of Rio Grande do Sul, Porto Alegre, RS,Brazil
Keywords:
Trichomonas vaginalis, Purinergic signaling, Adenosine, Neutrophils, Vaginal epithelial cells, Immune response.
Abstract: Trichomoniasis, one of the most common non-viral sexually transmitted infections worldwide,
is caused by the parasite Trichomonas vaginalis. The pathogen colonizes the human urogenital
tract, and the infection is associated with complications such as adverse pregnancy outcomes, cervical
cancer, and an increase in HIV transmission. The mechanisms of pathogenicity are multifactorial, and
controlling immune responses is essential for infection maintenance. Extracellular purine nucleotides are
released by cells in physiological and pathological conditions, and they are hydrolyzed by enzymes
called ecto-nucleotidases. The cellular effects of nucleotides and nucleosides occur via binding to purinoceptors,
or through the uptake by nucleoside transporters. Altogether, enzymes, receptors and transporters
constitute the purinergic signaling, a cellular network that regulates several effects in practically
all systems including mammals, helminths, protozoa, bacteria, and fungi. In this context, this review updates
the data on purinergic signaling involved in T. vaginalis biology and interaction with host cells,
focusing on the characterization of ecto-nucleotidases and on purine salvage pathways. The implications
of the final products, the nucleosides adenosine and guanosine, for human neutrophil response and vaginal
epithelial cell damage reveal the purinergic signaling as a potential new mechanism for alternative
drug targets.