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http://dx.doi.org/10.3347/kjp.2010.48.1.1

Delayed Human Neutrophil Apoptosis by Trichomonas vaginalis Lysate  

Song, Hyun-Ouk (Department of Environmental Biology & Medical Parasitology, Hanyang University College of Medicine)
Lim, Young-Su (Department of Anesthesiology and Pain Medicine, Konyang University)
Moon, Sun-Joo (Department of Environmental Biology & Medical Parasitology, Hanyang University College of Medicine)
Ahn, Myoung-Hee (Department of Environmental Biology & Medical Parasitology, Hanyang University College of Medicine)
Ryu, Jae-Sook (Department of Environmental Biology & Medical Parasitology, Hanyang University College of Medicine)
Publication Information
Parasites, Hosts and Diseases / v.48, no.1, 2010 , pp. 1-7 More about this Journal
Abstract
Neutrophils play an important role in the human immune system for protection against such microorganisms as a protozoan parasite, Trichomonas vaginalis; however, the precise role of neutrophils in the pathogenesis of trichomoniasis is still unknown. Moreover, it is thought that trichomonal lysates and excretory-secretory products (ESP), as well as live T. vaginalis, could possibly interact with neutrophils in local tissues, including areas of inflammation induced by T. vaginalis in humans. The aim of this study was to investigate the influence of T. vaginalis lysate on the fate of neutrophils. We found that T. vaginalis lysate inhibits apoptosis of human neutrophils as revealed by Giemsa stain. Less altered mitochondrial membrane potential (MMP) and surface CD16 receptor expression also supported the idea that neutrophil apoptosis is delayed after T. vaginalis lysate stimulation. In contrast, ESP stimulated-neutrophils were similar in apoptotic features of untreated neutrophils. Maintained caspase-3 and myeloid cell leukemia-1 (Mcl-1) in neutrophils co-cultured with trichomonad lysate suggest that an intrinsic mitochondrial pathway of apoptosis was involved in T. vaginalis lysate-induced delayed neutrophil apoptosis; this phenomenon may contribute to local inflammation in trichomoniasis.
Keywords
Trichomonas vaginalis; Tritrichomonas foetus; lysate; neutrophil; apoptosis; flow cytometry;
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