title: Ureaplasma parvum serovar 3 multiple banded antigen size variation after chronic intra-amniotic infection/colonization.
abstract: Ureaplasma species are the microorganisms most frequently associated with adverse pregnancy outcomes. The multiple banded antigen (MBA), a surface-exposed lipoprotein, is a key virulence factor of ureaplasmas. The MBA demonstrates size variation, which we have shown previously to be correlated with the severity of chorioamnion inflammation. We aimed to investigate U. parvum serovar 3 pathogenesis in vivo, using a sheep model, by investigating: MBA variation after long term (chronic) and short term (acute) durations of in utero ureaplasma infections, and the severity of chorioamnionitis and inflammation in other fetal tissues. Inocula of 2 × 10(7) colony-forming-units (CFU) of U. parvum serovar 3 (Up) or media controls (C) were injected intra-amniotically into pregnant ewes at one of three time points: day 55 (69d Up, n = 8; C69, n = 4); day 117 (7d Up, n = 8; C7, n = 2); and day 121 (3d Up, n = 8; C3, n = 2) of gestation (term = 145-150d). At day 124, preterm fetuses were delivered surgically. Samples of chorioamnion, fetal lung, and umbilical cord were: (i) snap frozen for subsequent ureaplasma culture, and (ii) fixed, embedded, sectioned and stained by haematoxylin and eosin stain for histological analysis. Selected fetal lung clinical ureaplasma isolates were cloned and filtered to obtain cultures from a single CFU. Passage 1 and clone 2 ureaplasma cultures were tested by western blot to demonstrate MBA variation. In acute durations of ureaplasma infection no MBA variants (3d Up) or very few MBA variants (7d Up) were present when compared to the original inoculum. However, numerous MBA size variants were generated in vivo (alike within contiguous tissues, amniotic fluid and fetal lung, but different variants were present within chorioamnion), during chronic, 69d exposure to ureaplasma infection. For the first time we have shown that the degree of ureaplasma MBA variation in vivo increased with the duration of gestation.
authors: Institute of Health & Biomedical Innovation, Faculty of Health, Queensland University of Technology, Brisbane, Queensland, Australia.
authors: James W
authors: JW
authors: Robinson
authors: Samantha J
authors: SJ
authors: Dando
authors: Ilias
authors: I
authors: Nitsos
authors: John
authors: J
authors: Newnham
authors: Graeme R
authors: GR
authors: Polglase
authors: Suhas G
authors: SG
authors: Kallapur
authors: J Jane
authors: JJ
authors: Pillow
authors: Boris W
authors: BW
authors: Kramer
authors: Alan H
authors: AH
authors: Jobe
authors: Diane
authors: D
authors: Payton
authors: Christine L
authors: CL
authors: Knox
mesh_terms: D000650:Amnion / Q000382:microbiology* / Q000473:pathology; D000653:Amniotic Fluid / Q000378:metabolism; D000818:Animals; D000940:Antigenic Variation / Q000276:immunology*; D000942:Antigens, Bacterial / Q000276:immunology*; D001426:Bacterial Proteins / Q000378:metabolism*; D015153:Blotting, Western; D001826:Body Fluids / Q000378:metabolism; D002908:Chronic Disease; D002999:Clone Cells; D015169:Colony Count, Microbial; D036861:Delivery, Obstetric; D005260:Female; D006863:Hydrogen-Ion Concentration; D008168:Lung / Q000473:pathology / Q000503:physiopathology; D008297:Male; D008970:Molecular Weight; D011247:Pregnancy; D011312:Pressure; D012756:Sheep / Q000382:microbiology; D014509:Ureaplasma / Q000254:growth & development / Q000276:immunology* / Q000302:isolation & purification / Q000502:physiology; D016869:Ureaplasma Infections / Q000276:immunology* / Q000382:microbiology*
chemical_list: D000942:Antigens, Bacterial; D001426:Bacterial Proteins; C089269:multiple-banded antigen, Ureaplasma
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