Download NK cells regulate pathogenesis of CMV in the ovary - NK2016

NK cells regulate pathogenesis of CMV in the ovary
Vanda Juranic Lisnic1, Jelena Tomac1, Daria Kvestak1, Tihana Trsan1, Marina Bralic1, Lars
Dolken2, Astrid Krmpotic1, Stipan Jonjic1
1Department
for Histology and embryology and Center for proteomics, Faculty of Medicine,
University of Rijeka, Croatia; 2Institute for Virology and immunobiology, Julius-MaximiliansUniversität Würzburg, Germany
Human cytomegalovirus (HCMV) is a wide-spear herpesvirus that causes life-long persistent
infections in its host. Although relatively harmless to immunocompetent individuals, it can cause
grave disease in patients with weakened or immature immune system. Infection during pregnancy
can cause pregnancy-loss or numerous long-term developmental disabilities.
HCMV is highly species specific and only infects humans. Murine cytomegalovirus (MCMV) is
biologically similar and related to HCMV; therefore the infection of mice with MCMV became
the most commonly used model for studying the biology and pathogenesis of CMV, especially in
research that is difficult to conduct in humans. Although CMV’s ability to pass the placenta and
cause devastating congenital disease is well established, very little is known about the CMV
infection of reproductive organs and its consequences on fertility and pregnancy outcome. We
have performed a detailed analysis of CMV pathogenesis in the ovary and observed that CMV
very successfully infects the ovaries. The virus is cleared by day 8 PI, indicating a strong role of
innate immune system in virus control. Moreover, the infection was completely excluded from
ovarian follicles, even in strongly immunosuppressed mouse strains in which nearly whole ovarian
stroma and corpora lutea were infected. Since MCMV is natural pathogen infecting the majority
of wild mice, development of strategies that can act immediately or very early to prevent infection
of follicles in order to preserve reproductive potential is a necessary evolutionary strategy. We
have uncovered several layers of protection that preserve ovarian follicles: physical barriers
preventing the infection and cells of the innate immune system. We show that ovarian follicles are
protected from the infection by a ring of macrophages that rely on NK cells. While the depletion
of NK cells does not result in increased viral titers in the ovary, we could observe infected follicles
and absence of macrophage rings.
I would prefer oral presentation, but poster is also fine.
Suitable sessions:
NK cells and virus infection
Innate lymphocyte compartments and interactions with other leukocytes
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