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- W2371206037 abstract "To determine the effects of leptospiral strains with different virulence on intracellular free Ca(2+)level and its relation with phospholipase C (PLC) activity of L.interrogans.L.interrogans-j infection cell modals were established with Vero and J774A.1 cell lines. Vero and J774A.1 cells were co-incubated with L.interrogans serogroup Icterohaemorrhagiae serovar lai strain 56601 (strong virulence) and serogroup Pomona serovar pomona strain 56608 (weak virulence) and L.biflexa serogroup Samaranga serovar patoc strain Patoc I (non-virulence). Intracellular free Ca(2+)levels were detected by laser scanning confocal microscopy with specific fluorescence labeling of fluoj3/AM. Using [(3)H] PIP2 as the substrate, the PLC activities in the culture supernatant, and cytoplasma and cytomembrane of the three strains of Leptospira were measured by isotope assay.The baseline intracellular free Ca(2+)levels in the normal Vero and J774A.1 cells were (102.3+/-8.2)% and (105.9+/-7.3)%,respectively. The fluorescence intensity in the two cell lines incubated with L.biflexa strain Patoc I were fluctuated in range of (102.3+/-8.2)%approximate, equals(102.2+/-8.3)% during the observation period. The intracellular free Ca(2+)levels in the two cell lines infected with L.interrogans strain 56601 showed elevation with double peak patterns, with first peaks of (430.5+/-35.7)%, (747.5+/-18.5)% and the second peak of (380.6+/-17.4)%, (804.6+/-22.4)%, respectively. When the cells were infected with L.interrogans strain 56608, the intracellular free Ca(2+)levels were rising slowly with a single slope-like pattern, with the maximal of (235.0+/-19.3)% in Vero cells and (402.4+/-17.4)% in J774A.1 cells, which were significantly lower than those in the cells infected with L.interrogans strain 56601 (P<0.01). The culture supernatants, and cytoplasma and cytomembrane proteins of all three strains displayed PLC activities (P<0.05).The cells infected with L.interrogans of different virulence show distinct intracellular free Ca(2+)levels and peak patterns. The different host cell lines can affect the intracellular free Ca(2+)levels, which is not related to the PLC activity in the leptospiral strains." @default.
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- W2371206037 date "2005-01-01" @default.
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- W2371206037 title "[Phospholipase C activity and alteration of intracellular free Ca2+ levels during internalization of Leptospira interrogans]." @default.
- W2371206037 doi "https://doi.org/10.3785/j.issn.1008-9292.2005.01.004" @default.
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