Antiviral Activity of Trappin-2 and Elafin In Vitro and In Vivo against Genital Herpes

Department of Medicine, Neurology Division.
Journal of Virology (Impact Factor: 4.44). 05/2013; 87(13). DOI: 10.1128/JVI.02243-12
Source: PubMed


Serine protease inhibitors elafin and its precursor, trappin-2, (Tr/E) have been associated with mucosal resistance to HIV-1 infection. We recently showed that Tr/E are among principal anti-HIV-1 molecules in cervicovaginal lavage (CVL) fluid, that E is ∼ 130 times more potent than Tr against HIV-1, and that Tr/E inhibited HIV-1 attachment and transcytosis across human genital epithelial cells (ECs). Since HSV-2 is a major sexually transmitted infection and risk factor for HIV-1 infection and transmission, we assessed Tr/E contribution to defense against HSV-2. Our in vitro studies demonstrated that pretreatment of endometrial (HEC-1A) and endocervical (End1/E6E7) ECs with human Tr-expressing adenovirus (Ad/Tr) or recombinant Tr/E proteins before or after HSV-2 infection resulted in significantly reduced virus titers compared to controls. Interestingly, E was ∼7 times more potent against HSV-2 infection than Tr. Conversely, knockdown of endogenous Tr/E by siRNA significantly increased HSV-2 replication in genital ECs. Recombinant Tr and E reduced viral attachment to genital ECs by acting indirectly on cells. Further, lower viral replication was associated with reduced secretion of pro-inflammatory IL-8 and TNFα and decreased NF-κB nuclear translocation. Additionally, protected Ad/Tr-treated ECs demonstrated enhanced IRF3 nuclear translocation and increased antiviral IFNβ in response to HSV-2. Lastly, in vivo studies of intravaginal HSV-2 infection in Tr-transgenic mice (Etg) showed that despite similar virus replication in the genital tract, Etg mice had reduced viral load and TNFα in the CNS. Collectively, this is the first experimental evidence highlighting anti-HSV-2 activity of Tr/E in female genital mucosa.

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Available from: Kenneth Lee Rosenthal, Oct 09, 2014
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    • "The reasons for raised CVF trappin2/elafin were not directly determined in this study. However, there is a wealth of literature describing the different roles trappin2/elafin proteins play in the innate immune response [6], [11], [25], [26]–[30]. Firstly, trappin2/elafin are well recognised as inhibitors of neutrophil elastase and protease 3 which are produced by activated neutrophils [6]. This is a protective response initiated by inflammatory mediators [11], [25] with trappin2/elafin proteins providing a ‘brake’ to excessive neutrophil activity and preventing damage of host tissues through induction of matrix metalloproteinases, glycoproteins, fibronectin and cadherins [26]–[28]. "
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