Role of DC-SIGN in Lassa virus entry into human dendritic cells.

The arenavirus Lassa virus (LASV) causes a severe hemorrhagic fever with high mortality in humans. Antigen-presenting cells, in particular dendritic cells (DCs), are early and preferred targets of LASV, and their productive infection contributes to the virus-induced immunosuppression observed in fatal disease. Here, we characterized the role of the C-type lectin DC-specific ICAM-3-grabbing nonintegrin (DC-SIGN) in LASV entry into primary human DCs using a chimera of the prototypic arenavirus lymphocytic choriomeningitis virus (LCMV) expressing the LASV glycoprotein (rLCMV-LASVGP). We found that differentiation of human primary monocytes into DCs enhanced virus attachment and entry, concomitant with the upregulation of DC-SIGN. LASV and rLCMV-LASVGP bound to DC-SIGN via mannose sugars located on the N-terminal GP1 subunit of LASVGP. We provide evidence that DC-SIGN serves as an attachment factor for rLCMV-LASVGP in monocyte-derived immature dendritic cells (MDDC) and can accelerate the capture of free virus. However, in contrast to the phlebovirus Uukuniemi virus (UUKV), which uses DC-SIGN as an authentic entry receptor, productive infection with rLCMV-LASVGP was less dependent on DC-SIGN. In contrast to the DC-SIGN-mediated cell entry of UUKV, entry of rLCMV-LASVGP in MDDC was remarkably slow and depended on actin, indicating the use of different endocytotic pathways. In sum, our data reveal that DC-SIGN can facilitate cell entry of LASV in human MDDC but that its role seems distinct from the function as an authentic entry receptor reported for phleboviruses.

The Effect of the No-Passing Zone Sign on "Passing" Accidents, 1963

The No Passing Zone sign (Wl0-4) was designed in 1958 for the purpose of informing the driver contemplating a passing maneuver of hazardous sight conditions ahead. This warning sign, of pennent shape design, was placed on the left side of the road so as to be more conspicuous to the intended driver. During the two year period 1959-1960, the Wl0-4 signs were erected throughout the Iowa Primary Road System.

Notice biographique sur M. Antoine Auriol : scolastique de la congrégation du St-Esprit et du St-Coeur de Marie... / [signé : "Francisque Lastiolas,..."]

Comprend : Notice biographique sur l'abbé Charles Demay...

Procès relatif à la publication du catalogue intitulé "Livres du boudoir de Marie-Antoinette", prétendue contre-façon imputée aux éditeurs sur la plainte de M. J. Taschereau, directeur de la Bibliothèque impériale. Réquisitoire de M. Hémar. Plaidoyer de Me Gallien. Jugement en faveur de M. Gay, éditeur et de M. Louis Lacour, auteur de la publication... [Suivi d'un appendice signé : Louis Lacour.]

[Factum. Gay, Jules (éditeur). 1864]

Description des monuments de Paris / Isaac de Bourges ; introduction et notes par l'abbé Valentin Dufour ; [avant-propos signé : P.-L. Jacob]

Collection : Collection des anciennes descriptions de Paris ; I