The internalization mechanism of Ureaplasma parvum in HeLa cells.

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Ureaplasma parvum (U. parvum) is a causative of preterm delivery and colonizes human urogenital tract. In order to clarify the intracellular viability of U. paravum in the host cells, U. parvum was challenged to HeLa cells. U. parvum accumulated in the perinuclear region of the HeLa cells within 48 h after infection. Internalization of U. parvum into the HeLa cells was suppressed both by the clathrin-dependent endocytosis inhibitor chlorpromazine hydrochloride (CPZ) and the siRNA. These experiments indicated that U. parvum was internalized into HeLa cells via clathrin-mediated endocytosis. U. parvum were colocalized with early to late endosome markers. The increased production of ROS was observed in the U. parvum infected cells, which lead to structural changes in the mitochondrial cristae and swelling of mitochondria. Our findings raise the possibility that CPZ may have a potential role in the phylaxis of U. parvum infections.