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Baculovirus-expressed glycoprotein H of herpes simplex virus type 1 (HSV-1) induces neutralizing antibody and delayed type hypersensitivity responses, but does not protect immunized mice against lethal HSV-1 challenge

¹ Ophthalmology Research, Cedars-Sinai Medical Center, Halper Building 111, 8700 Beverly Boulevard, Los Angeles, California 90048
and² Department of Ophthalmology, UCLA School of Medicine, Los Angeles, California 90024, U.S.A.

We have shown previously that herpes simplex virus type 1 (HSV-1) glycoprotein H (gH) expressed by a baculovirus recombinant is transported to the cell surface in the absence of other HSV-1 gene products, and that the expressed gH has an apparent M_r similar to that of authentic HSV-1 gH. We report here that antibodies raised in mice to this baculovirus-expressed gH neutralize the infectivity of HSV-1 in vitro; this neutralizing activity was not complement-dependent. Mice vaccinated with gH also developed delayed type hypersensitivity (DTH) to HSV-1. This is the first report of expressed HSV-1 gH inducing neutralizing antibody or DTH responses in vaccinated animals. In contrast to the gH expressed in mammalian systems, the ability of this baculovirus-expressed gH to induce a neutralizing antibody response may be due to the inability of the mammalian expression system to transport gH to the cell surface. Despite inducing anti-HSV-1 neutralizing antibody and DTH responses, vaccination of mice with gH did not protect the mice against lethal intraperitoneal challenge with HSV-1.

Received 3 September 1991; accepted 4 December 1991.

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