Immunization with a dominant-negative recombinant Herpes Simplex Virus (HSV) type 1 protects against HSV-2 genital disease in guinea pigs
© Brans and Yao; licensee BioMed Central Ltd. 2010
Received: 6 February 2010
Accepted: 3 June 2010
Published: 3 June 2010
CJ9-gD is a novel dominant-negative recombinant herpes simplex virus type 1 (HSV-1) that is completely replication-defective, cannot establish detectable latent infection in vivo, and expresses high levels of the major HSV-1 antigen glycoprotein D immediately following infection. In the present study, CJ9-gD was evaluated as a vaccine against HSV-2 genital infection in guinea pigs.
Animals immunized with CJ9-gD developed at least 700-fold higher titers of HSV-2-specific neutralization antibodies than mock-immunized controls. After challenge with wild-type HSV-2, all 10 control guinea pigs developed multiple genital lesions with an average of 21 lesions per animal. In contrast, only 2 minor lesions were found in 2 of 8 CJ9-gD-immunized animals, representing a 40-fold reduction on the incidence of primary genital lesions in immunized animals (p < 0.0001). Immunization significantly reduced the amount and duration of viral shedding and provided complete protection against neurological symptoms, while 90% of mock-immunized animals succumbed due to the severity of disease. Importantly, immunized animals showed no signs of recurrent disease or viral shedding during a 60-days observation period after recovery from primary infection, and carried 50-fold less latent viral DNA load in their dorsal root ganglia than the surviving mock-vaccinated controls (p < 0.0001).
Collectively, we demonstrate that vaccination with the HSV-1 recombinant CJ9-gD elicits strong and protective immune responses against primary and recurrent HSV-2 genital disease and significantly reduces the extent of latent infection.
Genital herpes is the main cause of genital ulcer disease worldwide and is due to infections with herpes simplex virus (HSV) [1, 2]. HSV-2 accounts for most cases of genital herpes . Recent studies indicate that in developed countries HSV-1 has become the main causative agent for primary genital herpes, especially among adolescents, women, and homosexual men [4–7]. The prevalence of HSV-2 in the general population ranges from 10%-60%, indicating that genital herpes is one of the most common sexually transmitted diseases [2, 8].
After primary genital infection, HSV establishes latent infection in dorsal root ganglia with lifelong persistence, subsequently giving rise to intermittent reactivation and recurrent disease . As the clinical appearance of genital HSV infection varies from unspecific symptoms to typically painful lesions , only 10-25% of people who are seropositive for HSV-2 are aware that they have genital herpes. HSV is intermittently shed from the genital mucosa in the absence of symptoms causing subconscious transmission of disease . Vertical transmission of HSV to neonates is associated with a high mortality rate and a high incidence of neurological sequelae in survivors . In addition, genital herpes has been linked to an increased risk of sexually acquiring and transmitting human immunodeficiency virus (HIV), which can be strongly reduced by HSV antiviral therapy [13, 14]. To date, the treatment and prevention of primary and recurrent disease is limited . Experimental vaccine approaches against genital herpes have included peptides, proteins, killed virus, DNA vaccines, heterologous replicating viral vectors, replication-defective viruses, and attenuated replication-competent viruses [16, 17]. Considering the general impact of HSV-1 diseases and rising importance of primary genital herpes caused by HSV-1, a desirable vaccine should be capable of offering effective protective immunity against both HSV subtypes.
A main target for subunit vaccine development has been HSV glycoprotein D (gD), a major antigen on the viral envelope . Subunit vaccines containing gD in combination with an adjuvant appeared to be safe and effective against genital herpes in guinea pigs [18–20], but failed to provide general protection in clinical trials [21, 22]. Replication-defective viruses lacking functions essential for viral replication or assembly of progeny virus particles have a broad antigenic spectrum and are more efficient than subunit vaccines in eliciting protective immune responses against genital HSV in mice and guinea pigs . However, the use of replication-defective viruses, particularly when used in latently infected individuals, imposes certain risks, as they might regain replication competence in the presence of wild-type virus or reactivate latent wild-type virus infections .
To minimize these safety concerns, using the T-REx™ gene switch technology (Invitrogen, Carlsbad, CA) developed in our laboratory and the dominant-negative mutant polypeptide UL9-C535C of HSV-1 origin binding protein UL9, we generated a novel class of replication-defective HSV-1 recombinant, CJ83193, which can prevent its own viral DNA replication as well as that of wild-type HSV-1 and HSV-2 in co-infected cells [25, 26]. To increase its safety and vaccine efficacy against HSV infections, we recently constructed a CJ83193-derived HSV-1 recombinant CJ9-gD by replacing the essential UL9 gene with an extra copy of the HSV-1 gD (gD1) gene under the control of the tetO-bearing hCMV major immediate-early promoter . We demonstrated that unlike the gD gene controlled by the endogenous promoter whose expression is dependent on viral replication , CJ9-gD expresses high-levels of gD at the immediate-early phase of HSV infection. Moreover, CJ9-gD is completely replication-defective and causes no detectable infection in trigeminal ganglia after ocular or nasal infection in mice . In mice, CJ9-gD induces strong and long-lasting humoral and Th1-associated cellular immune responses against HSV-1 and HSV-2 [27, 29]. Immunization with CJ9-gD protects mice against HSV-1 ocular keratitis and guinea pigs against HSV-1 skin disease [27, 30] as well as genital herpetic disease caused by wild-type HSV-1 and HSV-2 in mice . Previously, we have shown further that CJ9-gD is a safer and more effective vaccine than non-gD-expressing parental CJ83193 virus against HSV-1 infection [27, 29].
The guinea pig model of HSV-2 genital infection offers a unique advantage over the mouse model to investigate the efficacy of candidate HSV vaccine in protection against primary and recurrent HSV-2 genital infection and disease. Specifically, following primary intravaginal infection with HSV-2, guinea pigs develop vesicular lesions resembling those in humans, including development, appearance, and duration of disease. In contrast to mice in which spontaneous reactivation from latent infection rarely occurs in the vaginal tract, guinea pigs undergo episodic spontaneous recurrent infection and disease after recovering from initial genital disease [31, 32]. In the current report, we investigate whether CJ9-gD can serve as an effective vaccine in protection against both primary and recurrent HSV-2 genital infection and disease in guinea pigs following intravaginal challenge with wild-type HSV-2.
Induction of HSV-2-specific neutralization antibodies
Reduction of intravaginal replication of challenge HSV-2 in immunized guinea pigs
Protection against primary HSV-2 genital disease in immunized guinea pigs
After intravaginal challenge with wild-type HSV-2, animals were monitored daily for signs of disease. The development and clinical appearance of lesions caused by challenge virus in mock-vaccinated guinea pigs was consistent with previous observations.
Protection against recurrent HSV-2 infection in immunized guinea pigs
Prevention of recurrent HSV-2 infection in guinea pigs immunized with CJ9-gD
Mock (n = 3)
CJ9-gD (n = 8)
Protection from latent viral infection in immunized guinea pigs
Although to date no vaccine capable of completely preventing HSV infection has been reported, it is believed that great benefits can be obtained from developing a vaccine that prevents disease with or without partial protection from infection as demonstrated with pertussis and influenza virus vaccines . Our earlier studies demonstrate that immunization with CJ9-gD induces strong and long-lasting HSV-1- as well as HSV-2-specific humoral and Th1- cellular immune responses in mice, leading to a significant reduction in the amount and duration of acute replication of wild-type HSV-1 and HSV-2 after vaginal challenge compared with mock-immunized controls. At an immunization dose of 2 × 106 PFU of CJ9-gD, mice were completely protected from HSV-1 and HSV-2 disease . We were, however, unable to evaluate whether immunization with CJ9-gD is effective in protection against recurrent HSV genital infection and disease in mice. Therefore, in the present report we used guinea pigs to explore the efficacy of immunization with CJ9-gD against HSV-2 primary as well as recurrent genital infection and disease.
We demonstrate that immunization with CJ9-gD at a dose of 5 × 106 PFU elicits high levels of neutralizing antibodies against HSV-2 in guinea pigs. Titers increased significantly from the first to the second vaccination, indicating a boosting effect. Like in mice , immunization with CJ9-gD induced about 7-fold higher neutralization antibody titers in guinea pigs against HSV-1 than HSV-2 (p < 0.0001) (data not shown). In the present study cellular immune responses were not tested due to the lack of sufficient immunological reagents specific for guinea pigs. We did, however, demonstrate in mice that immunization with CJ9-gD elicits strong HSV-specific CD4+ and CD8+ T-cell responses against HSV-1 and in a lesser extent against HSV-2 at levels similar or comparable to those induced by wild-type HSV-1 [27, 29]. Given the demonstrated importance for both HSV-specific CD4+ and CD8+ T cells in clearance of virus from infected epithelium and in neural tissues in the mouse model of HSV infections [35–40], it is not surprising that HSV-2 cross-specific-T cell response elicited in CJ9-gD-immunized guinea pigs plays a critical role in limiting the replication of challenge virus during both primary infection and reactivation from latency.
Immunization with CJ9-gD significantly reduced the amount and duration of wild-type virus replication as well as the number of genital lesions after vaginal challenge with HSV-2 compared with that in mock-immunized guinea pigs. Only 2 of 8 immunized animals developed 2 mild and fast healing herpetiform lesions with no signs of systemic involvement. Morbidity was quite extensive in mock-vaccinated animals with an average of 20.6 lesions per animal, a high incidence of systemic involvement, and a mortality rate of 90%. High mortality rates in mock-vaccinated animals after vaginal challenge with wild-type HSV-2 have been reported by other groups [19, 41] and limit the evaluation of recurrences. The extent of disease might be influenced by the viral strain or stock, the viral titer and by the inoculation method used. Despite the extensive disease in mock-vaccinated animals, CJ9-gD provided good protection against genital challenge with wild-type HSV-2 in immunized guinea pigs. Therefore, it is reasonable to anticipate that protection would be more effective should a lower dose of challenge virus or a more gentle inoculation be selected.
In accordance with the protection against primary disease, neither recurrent vaginal shedding of infectious virus nor recurrent genital lesions were found in CJ9-gD-immunized animals. Quantitative PCR analysis shows that the amount of latent HSV DNA in dorsal root ganglia was 50-fold lower in immunized guinea pigs compared with the 2 mock-immunized guinea pigs that survived following challenge with wild-type HSV-2 (p < 0.0001). Recall that CJ9-gD cannot establish detectable latent infection in sensory ganglia in mice following ocular or intranasal infection  nor in dorsal root ganglia after subcutaneous immunization . The viral DNA detected in dorsal root ganglia of CJ9-gD-immunized guinea pigs after vaginal challenge should be primarily the challenge wild-type HSV-2 viral DNA. Taken together, these results are consistent with observations that a reduced latent infection is associated with a lower incidence of reactivation and recurrent disease [20, 41, 42].
Several vaccine candidates have been tested in guinea pigs against genital HSV-2 infection. The subunit vaccine gD2/AS04, which contains the HSV-2 major antigen glycoprotein D (gD2) in combination with the adjuvant aluminium hydroxide and 3-O-deacylated-monophosphoryl lipid A (MPL), was effective in prevention of primary and recurrent genital disease in immunized animals following challenge with wild-type HSV-2 [19, 20]. In phase 3 clinical trials, however, it only provided 73-74% efficacy in protecting against development of genital herpes disease in HSV-seronegative women . A recent study showed that the replication-defective HSV-2 recombinant dl 5-29 was more effective than the HSV-2-gD-based subunit vaccine in inducing HSV-2-specific neutralizing antibodies and CD8+ T-cell response in mice . CJ9-gD is an HSV-1 recombinant defective at level of viral DNA replication, and therefore, similar to dl5-29, capable of expressing a broad spectrum of viral antigens. In addition, it has a unique dominant-negative effect on viral replication (UL9-C535C expression) and expresses high levels of the major HSV-1 antigen gD at the immediate-early phase of infection . Immunization with CJ9-gD led to 220-fold reduction in the yield of challenge wild-type HSV-2 in genital swabs materials on day 2 post-challenge compared with mock-immunized controls. Noting that immunization with gD2/AS04 resulted in less than 14-fold challenge wild-type HSV-2 (strain MS) viral replication compared with mock-immunized controls on day 2 post-challenge, and all mock-immunized animals survived after recovery from primary disease caused by challenge virus , our study suggests that CJ9-gD could potentially be more efficacious than gD2 subunit vaccine against HSV-2 genital disease. It will be interesting to test the vaccine efficacy of gD2/AS04 and CJ9-gD in protecting against HSV-2 genital herpes in the same experimental settings. Moreover, in light of that CJ9-gD expresses high-level of gD, and induction of both effective mucosal and systemic immune responses is likely required for an optimal protection against HSV genital infection, it would be of great interest to investigate the effectiveness of CJ9-gD in induction of humoral and T-cell immunity following different routes of immunization and whether the efficacy of CJ9-gD in eliciting mucosal immune response can be enhanced by gD subunit prime/CJ9-gD boost regimen involving combination of mucosal and systemic immunization [44–46].
Many type-common and type-specific antibodies as well as T cell epitopes have been identified against various HSV-1 and HSV-2 proteins. Mice immunized with CJ9-gD develop stronger humoral and cellular immune responses against HSV-1 than against HSV-2, and are significantly better protected against genital infection with HSV-1 than with HSV-2 . These findings are in agreement with the previous reports that in rodents HSV vaccines are generally less effective in prevention of heterotypic HSV infection than homotypic infection [47, 48]. Combined with observations that humans who were previously infected with HSV-2 are less likely to experience re-infection with a heterologous strain of HSV-2 than individuals with prior HSV-1 infection [49–53], it is reasonable to believe, that a CJ9-gD-like dominant-negative HSV-2 recombinant would be more effective in prevention of genital HSV-2 infection than the HSV-1 recombinant CJ9-gD. This HSV-2 recombinant is currently being devised.
We demonstrate that immunization with a replication-defective and dominant-negative HSV-1 recombinant CJ9-gD expressing high levels of gD can induce strong cross-protective immunity against primary and recurrent HSV-2 genital infection and disease in guinea pigs. We show further that the latent viral load of challenge wild-type HSV-2 is significantly reduced in immunized guinea pigs compared with the mock-immunized controls. Collectively, CJ9-gD represents a new class of HSV-1 recombinant, which is avirulent, unable to establish detectable latent infection in vivo, and serves as an effective vaccine against genital HSV infection and disease in both mice and guinea pigs.
Female Hartley guinea pigs (300-350 g) were obtained from Charles River Breeding Laboratories (Wilmington, MA). The described animal experiments were conducted according to the protocols approved by the Harvard Medical Area Standing Committee on Animals and the American Veterinary Medical Association. The Harvard Medical School animal management program is accredited by the Association for Assessment and Accreditation of Laboratory Animal Care (AAALAC) and meets National Institutes of Health standards as set forth in "The Guide for the Care and Use of Laboratory Animals" (National Academy Press, 1996).
Cells and viruses
African Green Monkey Kidney (Vero) cells and RUL9-8 cells, a cell line derived from U2OS cells expressing UL9 and the tetracycline repressor (tetR), were grown and maintained in DMEM growth medium as previously described .
Wild-type HSV-2 MS strain (ATCC, Manassas, VA) was propagated and plaque assayed on Vero cells. CJ9-gD was derived from CJ83193 by replacing the essential UL9 gene with the HSV-1 gD gene driven by the tetO-containing hCMV major immediate-early promoter . CJ83193 is a replication-defective virus, in which both copies of the HSV-1 ICP0 gene were replaced by DNA sequences encoding the dominant-negative HSV-1 polypeptide UL9-C535C under control of the tetO-bearing hCMV major immediate-early promoter . CJ9-gD was propagated and plaque assayed in RUL9-8 cells.
Immunization and challenge
One set of 8 guinea pigs and one set of 10 guinea pigs were randomly assigned to 2 groups. Animals were either mock-immunized with DMEM (n = 10) or immunized with 5 × 106 PFU of CJ9-gD (n = 8) in a volume of 50 μl s.c. in the right and left upper flank per guinea pig. On day 21 after primary immunization, animals were boosted. At the same time and one day prior to viral challenge, serum was obtained from saphenous veins and stored at -80°C. Six weeks after the initial immunization, the animals were preswabbed with a moist sterile calcium alginate swab (Fisher Scientific, Waltham, MA) and inoculated intravaginally with 100 μl of culture medium containing 5 × 105 PFU of HSV-2 strain MS. Animals were kept on their backs with their rear part elevated under the influence of anesthesia for 30-45 min post-infection.
Detection of HSV-2-specific neutralization antibody titers
After challenge with wild-type HSV-2 strain MS, the animals were monitored daily until day 60. The number of lesions were counted and the progress of disease was scored using a modified method : 0 = no disease; 1 = redness or swelling; 2 = a few small vesicles; 3 = several large vesicles; 4 = several large ulcers with maceration; 5 = paralysis; and 6 = death.
Assay of acute and recurrent vaginal shedding of challenge virus
After challenge with wild-type HSV-2 strain MS, vaginal mucosae were swabbed with a moist calcium alginate swab (Fisher Scientific, Waltham, MA) on days 1, 2, 3, 5, 7 and 9. From days 30 to 60 post challenge swabs were taken daily. Swabs were kept in 1 ml DMEM and stored at -80°C until assayed for infectious virus by standard plaque assay on Vero cell monolayers.
Quantitative real-time PCR
At day 60 after intravaginal challenge with HSV-2 strain MS, 12 lower lumbar and sacral dorsal root ganglia were collected from each of the surviving guinea pigs. Dorsal root ganglia were kept separately in 0.5 ml of normal growth medium and stored at -80°C for further processing. DNA was isolated from each dorsal root ganglion and assayed for viral DNA by quantitative real-time PCR as described previously .
For statistical analysis unpaired Student's t-tests were performed.
Herpes simplex virus
This work was supported by Public Health Service Grant 5RO1AI05088 from the National Institutes of Health.
- Paz-Bailey G, Ramaswamy M, Hawkes SJ, Geretti AM: Herpes simplex virus type 2: epidemiology and management options in developing countries. Sex Transm Infect. 2007, 83 (1): 16-22. 10.1136/sti.2006.020966.PubMed CentralView ArticlePubMedGoogle Scholar
- Xu F, Sternberg MR, Kottiri BJ, McQuillan GM, Lee FK, Nahmias AJ, Berman SM, Markowitz LE: Trends in herpes simplex virus type 1 and type 2 seroprevalence in the United States. Jama. 2006, 296 (8): 964-973. 10.1001/jama.296.8.964.View ArticlePubMedGoogle Scholar
- Whitley RJ: Herpes simplex encephalitis: adolescents and adults. Antiviral Res. 2006, 71 (2-3): 141-148. 10.1016/j.antiviral.2006.04.002.View ArticlePubMedGoogle Scholar
- Lafferty WE, Downey L, Celum C, Wald A: Herpes simplex virus type 1 as a cause of genital herpes: impact on surveillance and prevention. J Infect Dis. 2000, 181 (4): 1454-1457. 10.1086/315395.View ArticlePubMedGoogle Scholar
- Jin F, Prestage GP, Mao L, Kippax SC, Pell CM, Donovan B, Templeton DJ, Taylor J, Mindel A, Kaldor JM: Transmission of herpes simplex virus types 1 and 2 in a prospective cohort of HIV-negative gay men: the health in men study. J Infect Dis. 2006, 194 (5): 561-570. 10.1086/506455.View ArticlePubMedGoogle Scholar
- Roberts CM, Pfister JR, Spear SJ: Increasing proportion of herpes simplex virus type 1 as a cause of genital herpes infection in college students. Sex Transm Dis. 2003, 30 (10): 797-800. 10.1097/01.OLQ.0000092387.58746.C7.View ArticlePubMedGoogle Scholar
- Nieuwenhuis RF, van Doornum GJ, Mulder PG, Neumann HA, van der Meijden WI: Importance of herpes simplex virus type-1 (HSV-1) in primary genital herpes. Acta Derm Venereol. 2006, 86 (2): 129-134.PubMedGoogle Scholar
- Malvy D, Halioua B, Lancon F, Rezvani A, Bertrais S, Chanzy B, Daniloski M, Ezzedine K, Malkin JE, Morand P: Epidemiology of genital herpes simplex virus infections in a community-based sample in France: results of the HERPIMAX study. Sex Transm Dis. 2005, 32 (8): 499-505. 10.1097/01.olq.0000161188.82905.b7.View ArticlePubMedGoogle Scholar
- Whitley RJ: Herpes simplex virus infection. Semin Pediatr Infect Dis. 2002, 13 (1): 6-11. 10.1053/spid.2002.29752.View ArticlePubMedGoogle Scholar
- Corey L, Adams HG, Brown ZA, Holmes KK: Genital herpes simplex virus infections: clinical manifestations, course, and complications. Ann Intern Med. 1983, 98 (6): 958-972.View ArticlePubMedGoogle Scholar
- Wald A, Zeh J, Selke S, Warren T, Ryncarz AJ, Ashley R, Krieger JN, Corey L: Reactivation of genital herpes simplex virus type 2 infection in asymptomatic seropositive persons. N Engl J Med. 2000, 342 (12): 844-850. 10.1056/NEJM200003233421203.View ArticlePubMedGoogle Scholar
- Jones CA: Vertical transmission of genital herpes: prevention and treatment options. Drugs. 2009, 69 (4): 421-434. 10.2165/00003495-200969040-00003.View ArticlePubMedGoogle Scholar
- Abu-Raddad LJ, Magaret AS, Celum C, Wald A, Longini IM, Self SG, Corey L: Genital herpes has played a more important role than any other sexually transmitted infection in driving HIV prevalence in Africa. PLoS ONE. 2008, 3 (5): e2230-10.1371/journal.pone.0002230.PubMed CentralView ArticlePubMedGoogle Scholar
- Freeman EE, Orroth KK, White RG, Glynn JR, Bakker R, Boily MC, Habbema D, Buve A, Hayes R: Proportion of new HIV infections attributable to herpes simplex 2 increases over time: simulations of the changing role of sexually transmitted infections in sub-Saharan African HIV epidemics. Sex Transm Infect. 2007, 83 (Suppl 1): i17-24. 10.1136/sti.2006.023549.View ArticlePubMedGoogle Scholar
- Whitley RJ, Roizman B: Herpes simplex virus infections. Lancet. 2001, 357 (9267): 1513-1518. 10.1016/S0140-6736(00)04638-9.View ArticlePubMedGoogle Scholar
- Koelle DM, Corey L: Recent progress in herpes simplex virus immunobiology and vaccine research. Clin Microbiol Rev. 2003, 16 (1): 96-113. 10.1128/CMR.16.1.96-113.2003.PubMed CentralView ArticlePubMedGoogle Scholar
- Stanberry LR: Clinical trials of prophylactic and therapeutic herpes simplex virus vaccines. Herpes. 2004, 11 (Suppl 3): 161A-169A.PubMedGoogle Scholar
- Stanberry LR, Bernstein DI, Burke RL, Pachl C, Myers MG: Vaccination with recombinant herpes simplex virus glycoproteins: protection against initial and recurrent genital herpes. J Infect Dis. 1987, 155 (5): 914-920.View ArticlePubMedGoogle Scholar
- Bourne N, Bravo FJ, Francotte M, Bernstein DI, Myers MG, Slaoui M, Stanberry LR: Herpes simplex virus (HSV) type 2 glycoprotein D subunit vaccines and protection against genital HSV-1 or HSV-2 disease in guinea pigs. J Infect Dis. 2003, 187 (4): 542-549. 10.1086/374002.View ArticlePubMedGoogle Scholar
- Bourne N, Milligan GN, Stanberry LR, Stegall R, Pyles RB: Impact of immunization with glycoprotein D2/AS04 on herpes simplex virus type 2 shedding into the genital tract in guinea pigs that become infected. J Infect Dis. 2005, 192 (12): 2117-2123. 10.1086/498247.View ArticlePubMedGoogle Scholar
- Stanberry LR, Spruance SL, Cunningham AL, Bernstein DI, Mindel A, Sacks S, Tyring S, Aoki FY, Slaoui M, Denis M: Glycoprotein-D-adjuvant vaccine to prevent genital herpes. N Engl J Med. 2002, 347 (21): 1652-1661. 10.1056/NEJMoa011915.View ArticlePubMedGoogle Scholar
- Corey L, Langenberg AG, Ashley R, Sekulovich RE, Izu AE, Douglas JM, Handsfield HH, Warren T, Marr L, Tyring S: Recombinant glycoprotein vaccine for the prevention of genital HSV-2 infection: two randomized controlled trials. Chiron HSV Vaccine Study Group. Jama. 1999, 282 (4): 331-340. 10.1001/jama.282.4.331.View ArticlePubMedGoogle Scholar
- Dudek T, Knipe DM: Replication-defective viruses as vaccines and vaccine vectors. Virology. 2006, 344 (1): 230-239. 10.1016/j.virol.2005.09.020.View ArticlePubMedGoogle Scholar
- Koelle DM, Ghiasi H: Prospects for developing an effective vaccine against ocular herpes simplex virus infection. Curr Eye Res. 2005, 30 (11): 929-942. 10.1080/02713680500313153.View ArticlePubMedGoogle Scholar
- Yao F, Eriksson E: A novel anti-herpes simplex virus type 1-specific herpes simplex virus type 1 recombinant. Hum Gene Ther. 1999, 10 (11): 1811-1818. 10.1089/10430349950017491.View ArticlePubMedGoogle Scholar
- Yao F, Eriksson E: Inhibition of herpes simplex virus type 2 (HSV-2) viral replication by the dominant negative mutant polypeptide of HSV-1 origin binding protein. Antiviral Res. 2002, 53 (2): 127-133. 10.1016/S0166-3542(01)00207-8.View ArticlePubMedGoogle Scholar
- Lu Z, Brans R, Akhrameyeva NV, Murakami N, Xu X, Yao F: High-level expression of glycoprotein D by a dominant-negative HSV-1 virus augments its efficacy as a vaccine against HSV-1 infection. J Invest Dermatol. 2009, 129 (5): 1174-1184. 10.1038/jid.2008.349.PubMed CentralView ArticlePubMedGoogle Scholar
- Augustinova H, Hoeller D, Yao F: The dominant-negative herpes simplex virus type 1 (HSV-1) recombinant CJ83193 can serve as an effective vaccine against wild-type HSV-1 infection in mice. J Virol. 2004, 78 (11): 5756-5765. 10.1128/JVI.78.11.5756-5765.2004.PubMed CentralView ArticlePubMedGoogle Scholar
- Brans R, Akhrameyeva NV, Yao F: Prevention of genital herpes simplex virus type 1 and 2 disease in mice immunized with a gD-expressing dominant-negative recombinant HSV-1. J Invest Dermatol. 2009, 129 (10): 2470-2479. 10.1038/jid.2009.86.PubMed CentralView ArticlePubMedGoogle Scholar
- Brans R, Eriksson E, Yao F: Immunization with a dominant-negative recombinant HSV type 1 protects against HSV-1 skin disease in guinea pigs. J Invest Dermatol. 2008, 128 (12): 2825-2832. 10.1038/jid.2008.142.View ArticlePubMedGoogle Scholar
- Stanberry LR, Kern ER, Richards JT, Abbott TM, Overall JC: Genital herpes in guinea pigs: pathogenesis of the primary infection and description of recurrent disease. J Infect Dis. 1982, 146 (3): 397-404.View ArticlePubMedGoogle Scholar
- Stanberry LR, Kern ER, Richards JT, Overall JC: Recurrent genital herpes simplex virus infection in guinea pigs. Intervirology. 1985, 24 (4): 226-231. 10.1159/000149647.View ArticlePubMedGoogle Scholar
- Yao F, Theopold C, Hoeller D, Bleiziffer O, Lu Z: Highly efficient regulation of gene expression by tetracycline in a replication-defective herpes simplex viral vector. Mol Ther. 2006, 13 (6): 1133-1141. 10.1016/j.ymthe.2006.01.009.View ArticlePubMedGoogle Scholar
- Stanberry LR, Cunningham AL, Mindel A, Scott LL, Spruance SL, Aoki FY, Lacey CJ: Prospects for control of herpes simplex virus disease through immunization. Clin Infect Dis. 2000, 30 (3): 549-566. 10.1086/313687.View ArticlePubMedGoogle Scholar
- Kuklin NA, Daheshia M, Marconi PC, Krisky DM, Rouse RJ, Glorioso JC, Manican E, Rouse BT: Modulation of mucosal and systemic immunity by enteric administration of nonreplicating herpes simplex virus expressing cytokines. Virology. 1998, 240 (2): 245-253. 10.1006/viro.1997.8926.View ArticlePubMedGoogle Scholar
- Ghiasi H, Perng G, Nesburn AB, Wechsler SL: Either a CD4(+)or CD8(+)T cell function is sufficient for clearance of infectious virus from trigeminal ganglia and establishment of herpes simplex virus type 1 latency in mice. Microb Pathog. 1999, 27 (6): 387-394. 10.1006/mpat.1999.0314.View ArticlePubMedGoogle Scholar
- Wakim LM, Jones CM, Gebhardt T, Preston CM, Carbone FR: CD8(+) T-cell attenuation of cutaneous herpes simplex virus infection reduces the average viral copy number of the ensuing latent infection. Immunol Cell Biol. 2008, 86 (8): 666-675. 10.1038/icb.2008.47.View ArticlePubMedGoogle Scholar
- van Lint A, Ayers M, Brooks AG, Coles RM, Heath WR, Carbone FR: Herpes simplex virus-specific CD8 + T cells can clear established lytic infections from skin and nerves and can partially limit the early spread of virus after cutaneous inoculation. J Immunol. 2004, 172 (1): 392-397.View ArticlePubMedGoogle Scholar
- Johnson AJ, Chu CF, Milligan GN: Effector CD4 + T-cell involvement in clearance of infectious herpes simplex virus type 1 from sensory ganglia and spinal cords. J Virol. 2008, 82 (19): 9678-9688. 10.1128/JVI.01159-08.PubMed CentralView ArticlePubMedGoogle Scholar
- Zhang X, Chentoufi AA, Dasgupta G, Nesburn AB, Wu M, Zhu X, Carpenter D, Wechsler SL, You S, BenMohamed L: A genital tract peptide epitope vaccine targeting TLR-2 efficiently induces local and systemic CD8 + T cells and protects against herpes simplex virus type 2 challenge. Mucosal Immunol. 2009, 2 (2): 129-143. 10.1038/mi.2008.81.PubMed CentralView ArticlePubMedGoogle Scholar
- Lekstrom-Himes JA, Pesnicak L, Straus SE: The quantity of latent viral DNA correlates with the relative rates at which herpes simplex virus types 1 and 2 cause recurrent genital herpes outbreaks. J Virol. 1998, 72 (4): 2760-2764.PubMed CentralPubMedGoogle Scholar
- Sawtell NM: The probability of in vivo reactivation of herpes simplex virus type 1 increases with the number of latently infected neurons in the ganglia. J Virol. 1998, 72 (8): 6888-6892.PubMed CentralPubMedGoogle Scholar
- Hoshino Y, Dalai SK, Wang K, Pesnicak L, Lau TY, Knipe DM, Cohen JI, Straus SE: Comparative efficacy and immunogenicity of replication-defective, recombinant glycoprotein, and DNA vaccines for herpes simplex virus 2 infections in mice and guinea pigs. J Virol. 2005, 79 (1): 410-418. 10.1128/JVI.79.1.410-418.2005.PubMed CentralView ArticlePubMedGoogle Scholar
- Neutra MR, Kozlowski PA: Mucosal vaccines: the promise and the challenge. Nat Rev Immunol. 2006, 6 (2): 148-158. 10.1038/nri1777.View ArticlePubMedGoogle Scholar
- Gallichan WS, Woolstencroft RN, Guarasci T, McCluskie MJ, Davis HL, Rosenthal KL: Intranasal immunization with CpG oligodeoxynucleotides as an adjuvant dramatically increases IgA and protection against herpes simplex virus-2 in the genital tract. J Immunol. 2001, 166 (5): 3451-3457.View ArticlePubMedGoogle Scholar
- Tengvall S, Lundqvist A, Eisenberg RJ, Cohen GH, Harandi AM: Mucosal administration of CpG oligodeoxynucleotide elicits strong CC and CXC chemokine responses in the vagina and serves as a potent Th1-tilting adjuvant for recombinant gD2 protein vaccination against genital herpes. J Virol. 2006, 80 (11): 5283-5291. 10.1128/JVI.02013-05.PubMed CentralView ArticlePubMedGoogle Scholar
- Boursnell ME, Entwisle C, Blakeley D, Roberts C, Duncan IA, Chisholm SE, Martin GM, Jennings R, Ni Challanain D, Sobek I: A genetically inactivated herpes simplex virus type 2 (HSV-2) vaccine provides effective protection against primary and recurrent HSV-2 disease. J Infect Dis. 1997, 175 (1): 16-25.View ArticlePubMedGoogle Scholar
- Da Costa XJ, Morrison LA, Knipe DM: Comparison of different forms of herpes simplex replication-defective mutant viruses as vaccines in a mouse model of HSV-2 genital infection. Virology. 2001, 288 (2): 256-263. 10.1006/viro.2001.1094.View ArticlePubMedGoogle Scholar
- Bryson Y, Dillon M, Bernstein DI, Radolf J, Zakowski P, Garratty E: Risk of acquisition of genital herpes simplex virus type 2 in sex partners of persons with genital herpes: a prospective couple study. J Infect Dis. 1993, 167 (4): 942-946.View ArticlePubMedGoogle Scholar
- Mertz GJ, Benedetti J, Ashley R, Selke SA, Corey L: Risk factors for the sexual transmission of genital herpes. Ann Intern Med. 1992, 116 (3): 197-202.View ArticlePubMedGoogle Scholar
- Looker KJ, Garnett GP: A systematic review of the epidemiology and interaction of herpes simplex virus types 1 and 2. Sex Transm Infect. 2005, 81 (2): 103-107. 10.1136/sti.2004.012039.PubMed CentralView ArticlePubMedGoogle Scholar
- Schmidt OW, Fife KH, Corey L: Reinfection is an uncommon occurrence in patients with symptomatic recurrent genital herpes. J Infect Dis. 1984, 149 (4): 645-646.View ArticlePubMedGoogle Scholar
- Lakeman AD, Nahmias AJ, Whitley RJ: Analysis of DNA from recurrent genital herpes simplex virus isolates by restriction endonuclease digestion. Sex Transm Dis. 1986, 13 (2): 61-66. 10.1097/00007435-198604000-00001.View ArticlePubMedGoogle Scholar