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Journal of Virology, April 2003, p. 4558-4565, Vol. 77, No. 8
0022-538X/03/$08.00+0     DOI: 10.1128/JVI.77.8.4558-4565.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Progesterone Increases Susceptibility and Decreases Immune Responses to Genital Herpes Infection

Charu Kaushic,* Ali A. Ashkar, Lesley A. Reid, and Kenneth L. Rosenthal

Department of Pathology and Molecular Medicine, Center of Gene Therapeutics, McMaster University Health Sciences Center, Hamilton, Ontario

Received 6 November 2002/ Accepted 24 January 2003

Depo-provera, a long-acting progestational formulation, is widely used to facilitate infection of sexually transmitted diseases in animal models. We have previously reported that hormone treatments change susceptibility and immune responses to genital tract infections. In this study we compared the changes in susceptibility of mice to genital herpes simplex virus type 2 (HSV-2) after Depo-provera or a saline suspension of progesterone (P-sal). We found that following Depo-provera-treatment, mice had prolonged diestrus that lasted more than 4 weeks. This coincided with a 100-fold increase in susceptibility to genital HSV-2 compared to that of untreated mice. Mice given P-sal were in diestrous stage for 4 to 6 days before returning to irregular reproductive cycles. When these mice were infected at diestrus they showed a 10-fold increase in susceptibility compared to that of normal, untreated mice. P-sal-treated mice infected at estrus were susceptible to HSV-2, depending on the infectious dose. Normal, untreated mice in estrus were not susceptible to HSV-2, even at a high infectious dose of 107 PFU. In addition to alterations in susceptibility, Depo-provera treatment had inhibitory effects on immune responses to HSV-2. Mice immunized with HSV-2 protein (gB) and treated with Depo-provera showed significant lowering of local HSV-2-specific immunoglobulin G (IgG) and IgA in their vaginal washes. Mice immunized with an attenuated strain of HSV-2 2 weeks after Depo-provera treatment failed to develop protection when challenged intravaginally with wild-type HSV-2. In contrast, mice given progesterone and immunized at diestrus or estrus were completely protected from intravaginal challenge. These studies show that Depo-provera treatment changes susceptibility and local immune responses to genital HSV-2 infection. Animal models and vaccine strategies for sexually transmitted diseases need to consider the effect of hormone treatments on susceptibility and immune responses.

* Corresponding author. Mailing address: Department of Pathology, HSC 4H30F, McMaster University, 1200 Main St. W., Hamilton, Ontario, Canada L8N 3Z5. Phone (905) 525-9140, ext. 22988. Fax: (905) 522-6750. E-mail: kaushic{at}mcmaster.ca.

Journal of Virology, April 2003, p. 4558-4565, Vol. 77, No. 8
0022-538X/03/$08.00+0     DOI: 10.1128/JVI.77.8.4558-4565.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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